19-1397; Rev 0; 10/98 KIT ATION EVALU E L B AVAILA Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches The MAX4550/MAX4570 serial-interface, programmable, dual 4x2 audio/video crosspoint switches are ideal for multimedia applications. Each device contains two identical crosspoint switch arrays, each with four inputs and two outputs. To improve off-isolation, use the additional crosspoint inputs SA and SB as shunts. Each output is selectively programmable for clickless or regular mode operation. A set of internal resistive voltagedividers supplies DC bias for each output when using AC-coupled inputs. Additionally, four auxiliary outputs control additional circuitry via the MAX4550/MAX4570's 2-wire or 3-wire interface. The MAX4550/MAX4570 feature 80 on-resistance, 10 on-resistance matching between channels, 5 onresistance flatness, and 0.014% total harmonic distortion. Additionally, they feature off-isolation of at least -110dB in the audio frequency range and -78dB at 4MHz, with -95dB crosstalk in the audio frequency range and -54dB at 4MHz. The MAX4550 uses a 2-wire I 2C-compatible serial interface, while the MAX4570 uses a 3-wire SPITM/QSPITM or MICROWIRETM-compatible serial interface. These parts are available in 28-pin SSOP and wide SO packages and are tested over either the commercial (0C to +70C) or extended (-40C to +85C) operating temperature range. Applications Set-Top Boxes PC Multimedia Boards Features Selectable Soft Switching Mode for Clickless Audio Operation 43 Typical On-Resistance (5V Supplies) 5 Typical On-Resistance Matching Between Channels 4 Typical On-Resistance Flatness 0.014% Total Harmonic Distortion with 1k Load -110dB Off-Isolation at 20kHz -78dB Off-Isolation at 4MHz -95dB Crosstalk at 20kHz -54dB Crosstalk at 4MHz Serial Interface 2-Wire, Fast-Mode, I2C-Compatible (MAX4550) 3-Wire, SPI/QSPI/MICROWIRE-Compatible (MAX4570) Four Auxiliary Outputs that Extend P Ports Single-Supply Operation: +2.7V to +5.5V Dual-Supply Operation: 2.7V to 5.5V Pin Configuration TOP VIEW High-End Audio Systems Video Conferencing Systems Ordering Information NO3A 2 27 NO2B NO3B 3 26 NO2A BIASH 4 25 V- TEMP. RANGE PIN-PACKAGE MAX4550CAI 0C to +70C 28 SSOP MAX4550CWI MAX4550EAI MAX4550EWI MAX4570CAI 0C to +70C -40C to +85C -40C to +85C 0C to +70C 28 Wide SO 28 SSOP 28 Wide SO 28 SSOP MAX4570CWI MAX4570EAI MAX4570EWI 0C to +70C -40C to +85C -40C to +85C 28 Wide SO 28 SSOP 28 Wide SO I2C is a trademark of Philips Corp. SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. 24 V+ BIASL 5 NO4A 6 PART 28 SA SB 1 MAX4550 MAX4570 23 NO1B 22 NO1A NO4B 7 21 GND V+ 8 20 COM1A COM2A 9 19 Q3 Q0 10 18 COM1B COM2B 11 17 Q2 Q1 12 A0 (CS) 13 16 A1 (DOUT) SCL (SCLK) 14 15 SDA (DIN) SO/SSOP ( ) ARE FOR MAX4570. Functional Diagram appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX4550/MAX4570 General Description MAX4550/MAX4570 Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches ABSOLUTE MAXIMUM RATINGS V+ to GND ............................................................... -0.3V to +6V V+ to V-................................................................-0.3V to +13.2V V- to GND .................................................................+0.3V to -6V NO_ _ , S_, BIAS_, COM_ _, Q_, A1, DOUT to GND (Note 1)...............................................(V- - 0.3V) to (V+ + 0.3V) CS, SCLK, DIN, SCL, SDA, A0 to GND ....................-0.3V to +6V Continuous Current into Any Terminal..............................10mA Peak Current, NO_ _ , S_ , COM_ _ (pulsed at 1ms, 10% duty cycle max) ..........................40mA Continuous Power Dissipation (TA = +70C) 28-Pin SSOP (derate 9.52mW/C above +70C) .........762mW 28-Pin Wide SO (derate 12.5mW/C above +70C) ...1000mW Operating Temperature Ranges MAX4550C_I/MAX4570C_I ...............................-0C to +70C MAX4550E_I/MAX4570E_I ..............................-40C to +85C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C Note 1: Signals on NO_ _, S_, or COM_ _ exceeding V+ or V- are clamped by internal diodes. Limit forward-diode current to maximum current rating. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ANALOG ELECTRICAL CHARACTERISTICS--Dual Supplies (V+ = +5V 5%, V- = -5V 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V+ V ANALOG SWITCHES Analog Signal Range (Note 3) On-Resistance COM_ _ to NO_ _ or S_ On-Resistance Match Between Channels (Note 4) VNO_ _, VCOM_ _, VS_ RON RON VICOM_ _ = 4mA, VNO_ _ or VS_ = 3.0V, V+ = 4.75V, V- = -4.75V TA = +25C ICOM_ _ = 4mA, VNO_ _ or VS_ = 3.0V, V+ = 4.75V, V- = -4.75V TA = +25C 43 TA = TMIN to TMAX ICOM_ _ = 4mA; TA = +25C RFLAT(ON) VNO_ _ or VS_ = 3.0V, 0; TA = TMIN to TMAX V+ = 4.75V; V- = -4.75V NO_ _ or S_ Off-Leakage Current (Note 6) NO_(OFF) COM_ _ Off-Leakage Current (Note 6) ICOM_(OFF) COM_ _ On-Leakage Current (Note 6) ICOM_(ON) 100 5 TA = TMIN to TMAX COM_ _ to NO_ _ or S_ On-Resistance Flatness (Note 5) 80 10 10 4 5 8 VNO_ _ or VS_ = 4.5V, - 4.5V, VCOM_ = + V+ = 5.25V, V- = -5.25V TA = +25C -1 TA = TMIN to TMAX -10 VNO_ _ or VS_ = 4.5V, - 4.5V, VCOM_ = + V+ = 5.25V, V- = -5.25V TA = +25C -5 TA = TMIN to TMAX -10 VNO_ _ or VS_ = floating, VCOM_ = 4.5V, V+ = 5.25V, V- = -5.25V TA = +25C -5 TA = TMIN to TMAX -20 0.01 1 nA 10 0.01 5 nA 10 0.01 5 nA 20 AUDIO PERFORMANCE Total Harmonic Distortion plus Noise THD+N fIN = 1kHz, RL = 1k, VNO_ or VS_ = 1VRMS, VNO_ or VS_ = 0 Off-Isolation (Note 7) VISO(A) VNO = 1VRMS, fIN = 20kHz, RL = 10k, S = GND Channel-to-Channel Crosstalk Channel-to-Channel Crosstalk VCTA(A) VCTA(A) ICOM_ _ =VS_ 1mA VNO_ _ or = 1VRMS, fIN = 20kHz, RL = 10k, three channels driven at 20kHz 2 0.014 Shunt switch on -110 Shunt switch off -80 -95 _______________________________________________________________________________________ % dB dB Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches (V+ = +5V 5%, V- = -5V 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS VIDEO PERFORMANCE Off-Isolation VISO(V) Channel-to-Channel Crosstalk VCT(V) 0.1dB Bandwidth BW Off-Capacitance COFF(NO) VNO_ _ or VS_ = 1VRMS, fIN = 4MHz, RL = 1k, S_ = GND Shunt switch on -78 Shunt switch off -63 dB VNO_ _ or VS_ = 1VRMS, fIN = 4MHz, RL = 10, three channels driven at 4MHz -54 dB RS = 75, RL = 1k 14 MHz fIN = 1MHz, 11 pF DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Note 8) Turn-On Time (Note 9) tONSD VNO_ _ or VS_ = 1.5V, RL = 5k Turn-Off Time (Note 9) tOFFSD VNO_ _ or VS_ = 1.5V, RL = 300 Break-Before-Make Time tBBM VNO_ _ or VS_ = 1.5V 10 400 900 ns 200 500 ns 100 ns DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note 8, Figure 5) Turn-On Time tONSE VNO_ _ or VS_ = 1.5V, RL = 5k 36 ms Turn-Off Time tOFFSE VNO_ _ or VS_ = 1.5V, RL = 300 11 ms RBIAS BIASH to BIASL BIAS NETWORKS Bias Network Resistance 13 20 27 k 5.25 0 V 20 A -20 A MAX UNITS V+ V POWER SUPPLIES Supply Voltage Range V+ V- 2.7 -5.25 V+ Supply Current (Note 10) I+ Reset condition, V+ = 2.7V to 5.25V V- Supply Current I- Reset condition, V- = -5.25V to 0 7 ANALOG ELECTRICAL CHARACTERISTICS--Single +5V Supply (V+ = +5V 5%, V- = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP ANALOG SWITCHES Analog Signal Range (Note 3) On-Resistance VNO_ _, VCOM_ _, VS_ ICOM_ _ = 4mA, VNO_ _ or VS_ = 3.0V, V+ = 4.75V TA = +25C ICOM_ _ = 4mA, VNO_ _ or VS_ = 3.0V, V+ = 4.75V TA = +25C ICOM_ _ = 4mA; VNO_ _ or VS_ = 1V, 2V, 3V; V+ = 4.75V TA = +25C VNO or VS_ = 4.5V, 1V; INO_ _(OFF) VCOM_ _ = 1V, 4.5V; V+ = 5.25V TA = +25C -1 TA = TMIN to TMAX -10 RON On-Resistance Match Between Channels (Note 4) RON On-Resistance Flatness (Note 5) RFLAT NO_ _ or S_ Off-Leakage Current (Notes 6, 11) 0 60 TA = TMIN to TMAX 100 130 5 TA = TMIN to TMAX 10 10 4 TA = TMIN to TMAX 10 15 0.01 1 nA 10 _______________________________________________________________________________________ 3 MAX4550/MAX4570 ANALOG ELECTRICAL CHARACTERISTICS--Dual Supplies (continued) MAX4550/MAX4570 Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches ANALOG ELECTRICAL CHARACTERISTICS--Single +5V Supply (continued) (V+ = +5V 5%, V- = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX 0.01 5 COM_ _ Off-Leakage Current (Notes 6, 11) VNO_ _ or VS_ = 4.5V, 1V; ICOM_ _(OFF) VCOM_ _ = 1V, 4.5V; V+ = 5.25V TA = +25C -5 TA = TMIN to TMAX -10 COM_ _ On-Leakage Current (Notes 6, 11) VNO_ _ or VS_ = floating; ICOM_ _(ON) VCOM_ _ = 1V, 4.5V; V+ = 5.25V TA = +25C -5 TA = TMIN to TMAX -20 UNITS nA 10 0.01 5 nA 20 AUDIO PERFORMANCE Total Harmonic Distortion plus Noise THD+N fIN = 1kHz, RL = 10k, VNO_ _ or VS_ = 1VRMS, VNO_ _ or VS_ = 2.5V 0.014 Off-Isolation (Note 7) VISO(A) VNO_ _ or VS_ = 1VRMS, fIN = 20kHz, RL = 10k, S = GND Shunt switch on -105 Shunt switch off -80 Channel-to-Channel Crosstalk VTC(A) VNO_ _ or VS_ = 1VRMS, fIN = 20kHz, RL = 10k, three channels driven at 20kHz Off-Isolation (Note 7) VISO(V) VNO_ _ or VS_ = 1VRMS, fIN = 4MHz, RL = 1k, S = GND Channel-to-Channel Crosstalk VTC(V) VNO_ _ or VS_ = 1VRMS, fIN = 4MHz, RL = 10k, three channels driven at 4MHz -52 dB RSOURCE = 75, RL = 1k 13 MHz fIN = 1MHz 11 pF % dB -97 dB VIDEO PERFORMANCE 0.1dB Bandwidth BW Off-Capacitance COFF(NO) Shunt switch on -74 Shunt switch off -61 dB DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Note 8) Turn-On Time (Note 9) tONSD VNO_ _ or VS_ = 1.5V, RL = 5k 400 900 ns Turn-Off Time (Note 9) tOFFSD VNO_ _ or VS_ = 1.5V, RL = 300 160 500 ns Break-Before-Make Time tBBM VNO_ _ or VS_ = 1.5V 10 100 ns DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note 8, Figure 5) Turn-On Time tONSE VNO_ _ or VS_ = 1.5V, RL = 5k 43 ms Turn-Off Time tOFFSE VNO_ _ or VS_ = 1.5V, RL = 300 14 ms RBIAS BIASH to BIASL BIAS NETWORKS Bias Network Resistance 13 20 27 k MAX UNITS V+ V ANALOG ELECTRICAL CHARACTERISTICS--Single +3V Supply (V+ = +3V 10%, V- = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP ANALOG SWITCHES Analog Signal Range (Note 3) On-Resistance 4 VNO_ _, VCOM_ _, VS_ RON 0 ICOM_ _ = 4mA, VNO_ _ or VS_ = 1V, V+ = 2.7V TA = +25C 106 TA = TMIN to TMAX _______________________________________________________________________________________ 180 220 Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches (V+ = +2.7V to +5.5V, V- = 0 to -5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP ISOURCE = 1mA to GND, V+ = 4.75V 4.45 4.65 ISOURCE = 0.5mA to GND, V+ = 2.7V 2.3 2.5 MAX UNITS AUXILIARY OUTPUTS Output High Voltage VOH Output Low Voltage VOL V ISINK = 6mA, V+ = 2.7V 0.5 1.0 ISINK = 12mA, V+ = 4.75V 0.5 1.0 V DIGITAL INPUTS (SCK, DIN, CS, SCL, SDA) Input High Voltage VIH Input Low Voltage VIL Input Hysteresis VHYST Input Leakage Current (Note 7) ILEAK Input Capacitance CNO V+ > 3.6V 3.0 V+ < 3.6V 2.0 V V+ > 3.6V 0.8 V+ < 3.6V 0.6 0.2 VNO_ _ = 0 or 5V -1 0.01 V V 1 5 A pF DIGITAL OUTPUTS (DOUT, SDA) Output Low Voltage VOL ISINK = 6mA ISINK = 6mA DOUT Output High Voltage VOH ISOURCE = 0.5mA V+ = 4.75V 0.4 V+ = 2.7V 0.8 V+ - 0.5 V+ - 0.1 V V I2C TIMING (V+ = +4.75V to +5.25V, Figures 1, 2) SCL Clock Frequency fSCL DC Bus Free Time between Stop and Start Condition 400 kHz tBUF 1.3 STOP Condition Setup Time tSU:STO 0.6 Data Hold Time tHD:DAT 0 Data Setup Time tSU:DAT 100 ns Clock Low Period tLOW 1.3 s Clock High Period tHIGH 0.6 s SCL/SDA Rise Time (Note 12) tR 20 + 0.1Cb 300 SCL/SDA Fall Time (Note 12) tF 20 + 0.1Cb 300 2.1 s s 0.9 s ns ns SPI TIMING (V+ = +4.75V to +5.25V, Figures 3, 4) Operating Frequency fOP DC DIN to SCLK Setup fDS 100 DIN to SCLK Hold fDH CLOAD = 50pF 20 MHz ns 0 ns 200 ns SCLK Fall to Output Data Valid fDO CS to SCLK Rise Setup fCSS 100 ns CS to SCLK Rise Hold fCSH 0 ns _______________________________________________________________________________________ 5 MAX4550/MAX4570 INTERFACE I/O CHARACTERISTICS INTERFACE I/O CHARACTERISTICS (continued) (V+ = +2.7V to +5.5V, V- = 0 to -5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SCLK Pulse Width Low tCH 200 SCLK Pulse Width High tCL 200 Rise Time (SCLK, DIN, CS) tR 2.0 s Fall Time (SCLK, DIN, CS) tF 2.0 s ns ns The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. Guaranteed by design. Not subject to production testing. RON = RON(MAX) - RON(MIN). On-resistance flatness is defined as the difference between the maximum and minimum on-resistance values, as measured over the specified analog signal range. Note 6: Leakage parameters are 100% tested at maximum rated temperature, and guaranteed by correlation at TA = +25C. Note 7: Off-isolation = 20 * log (VCOM_ __ / VNO_ _ ), VCOM_ _ = output, VNO_ _ = input to off switch. Note 8: All timing is measured from the clock's falling edge preceding the ACK signal for 2-wire, and from CS's rising edge for 3-wire. Turn-Off Time is defined as the output of the switch for 0.5V change, tested with a 300 load to ground. Turn-On Time is measured with a 5k load resistor to GND. All timing is shown with respect to 20% of V+ and 70% of V+, unless otherwise noted. Note 9: Typical values are for MAX4570 only. Note 10: Supply current can be as high as 2mA per switch during switch transitions in the clickless mode, corresponding to 40mA total supply transient current requirement. Note 11: Leakage testing for single-supply operation is guaranteed by testing with dual supplies. Note 12: Cb = capacitance of one bus line in pF. Tested with Cb = 400pF. Note 2: Note 3: Note 4: Note 5: Typical Operating Characteristics (TA = +25C, unless otherwise noted.) V = 2.7V V = 5V 55 TA = +85C 54 120 V = 3.3V 50 TA = +70C 45 TA = +25C 40 46 100 90 80 V+ = +3.3V 70 V = 4.75V 44 RON () RON () 52 V+ = +2.7V 110 50 48 35 V+ = +5V 60 42 TA = -40C 30 40 -5 -4 -3 -2 -1 0 1 VCOM (V) 6 130 AMX4550/4570-03 58 AMX4550/4570-02 60 AMX4550/4570-01 60 56 ON-RESISTANCE vs. VCOM (SINGLE SUPPLY) ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES) ON-RESISTANCE vs. VCOM (DUAL SUPPLIES) RON () MAX4550/MAX4570 Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches 2 3 4 5 50 -5 -4 -3 -2 -1 0 1 VCOM (V) 2 3 4 5 0 1 2 3 VCOM (V) _______________________________________________________________________________________ 4 5 Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570 Typical Operating Characteristics (continued) (TA = +25C, unless otherwise noted.) 65 TA = +25C 55 55 50 45 V = 5V 50 40 TA = -40C 45 COM_ON 10 COM_OFF 1 30 1 2 3 4 5 0.1 -40 -20 0 20 40 60 -40 80 VCOM (V) TEMPERATURE (C) SUPPLY CURRENT vs. TEMPERATURE (DUAL SUPPLIES) SUPPLY CURRENT vs. TEMPERATURE (SINGLE SUPPLY) 7 6 I- 5 4 3 8 12 6 V+ = +5V 5 4 10 6 2 2 0 40 60 80 -40 -20 TEMPERATURE (C) TURN-ON/TURN-OFF TIMES vs. SUPPLY VOLTAGE (DUAL SUPPLIES) 800 40 60 80 500 400 tOFF 300 200 2.7 3.1 3.5 3.9 4.3 VSUPPLY (V) 4.7 5.1 5.5 0 1 2 3 4 OFF-ISOLATION AND CROSSTALK vs. FREQUENCY 1000 800 tON 700 0 600 5 AMX4550/4570-12 10 -30 V = 5V -40 -50 -10 CROSSTALK (dB) 600 -2 -1 TURN-ON/TURN-OFF TIMES vs. SUPPLY VOLTAGE (SINGLE SUPPLY) 1100 TIME (ns) tON -3 VCOM (V) 900 700 -5 -4 AMX4550/4570-10 900 20 TEMPERATURE (C) 1200 AMX4550/4570-11 1000 0 V+ = +5V V- = 0 4 V+ = +2.7V 1 20 V = 5V 8 2 0 80 14 1 -20 60 16 7 3 -40 40 CHARGE INJECTION vs. VCOM Q (pC) SUPPLY CURRENT (A) I+ 8 V- = 0 9 20 18 AMX4550/4570-08 V+ = 5V 9 0 TEMPERATURE (C) 10 AMX4550/4570-07 10 -20 AMX4550/4570-09 0 SUPPLY CURRENT (A) NO_OFF 100 35 40 TIME (ns) V = 5V 1000 -20 -60 OFF-ISOLATION -70 -30 -80 -40 CROSSTALK -50 -90 500 -60 -100 400 -70 -110 300 -80 -120 200 -90 tOFF 2.7 3.1 3.5 3.9 4.3 VSUPPLY (V) 4.7 5.1 5.5 -130 0.5 1 10 100 FREQUENCY (MHz) _______________________________________________________________________________________ 7 ISOLATION (dB) RON () 60 V+ = +5V V- = 0 60 TA = +70C 65 RON () V+ = +5V V- = 0 10,000 LEAKAGE CURRENT (pA) TA = +85C LEAKAGE CURRENT vs. TEMPERATURE AMX4550/4570-05 70 ON-RESISTANCE vs. TEMPERATURE 70 AMX4550/4570-04 75 AMX4550/4570-06 ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY) Typical Operating Characteristics (continued) (TA = +25C, unless otherwise noted.) V = 5V 0 V = 5V 0.15 0.10 -1 0.1 AMX4550/4570-14 0.20 AMX4550/4570-13 2 1 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY FREQUENCY RESPONSE AMX4550/4570-15 FREQUENCY RESPONSE RLOAD = 10k V = 5V -3 -4 0 -0.05 -0.10 -5 -0.15 -6 -0.20 -7 -0.25 -8 THD+NOISE (%) 0.05 -2 LOSS (dB) -0.30 1 10 100 500 0.5 1 2 5 10 20 0.01 0.001 1 10 100 1000 10,000 100,000 FREQUENCY (MHz) FREQUENCY (Hz) COM RISE TIME (SOFT MODE) COM FALL TIME (SOFT MODE) COM TURN-ON TIME (HARD MODE) V = 5V V = 5V 200mV/ div 200mV/ div AMX4550/4570-18 FREQUENCY (MHz) AMX4550/4570-16 0.5 AMX4550/4570-17 LOSS (1dB/div) V = 5V CS 1V/div 0 COM 0.5V/div 0 500s/div COM TURN-OFF TIME (HARD MODE) COM TURN-ON TIME (SOFT MODE) V = 5V CS 1V/div 0 50ns/div COM TURN-OFF TIME (SOFT MODE) AMX4550/4570-20 500s/div V = 5V CS 1V/div AMX4550/4570-21 0 AMX4550/4570-19 MAX4550/MAX4570 Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches V = 5V CS 1V/div 0 0 0 COM 0.5V/div COM 0.5V/div COM 0.5V/div 0 0 0 25ns/div 8 5ms/div 5ms/div _______________________________________________________________________________________ Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches PIN NAME FUNCTION MAX4550 MAX4570 1 1 SB 2 2 NO3A Input 3 to Crosspoint A 3 3 NO3B Input 3 to Crosspoint B 4 4 BIASH High Side of Bias Network. Use to give the outputs a DC bias when inputs are AC-coupled (refer to the Using the Internal Bias Resistors section). 5 5 BIASL Low Side of Bias Network. Use to give the outputs a DC bias when inputs are AC-coupled (refer to the Using the Internal Bias Resistors section). 6 6 NO4A Input 4 to Crosspoint A 7 7 NO4B Input 4 to Crosspoint B 8, 24 8, 24 V+ Shunt Input to Crosspoint B. Use for shunt capacitor or AC ground connection to improve off-isolation, or as an additional input to switch matrix B. Positive Supply Voltage. Supply range is +2.7V to +5.25V. Connect pin 8 to pin 24 externally. 9 9 COM2A 10 10 Q0 Output 2 of Crosspoint A 11 11 COM2B 12 12 Q1 Auxiliary Output 1 13 -- A0 LSB+1 of 2-Wire Serial-Interface Address Field -- 13 CS Chip Select of 3-Wire Interface. Logic low on CS enables serial data to be clocked in to device. Programming commands are executed on CS's rising edge. 14 -- SCL 2-Wire Serial-Interface Clock Input Auxiliary Output 0 Output 2 of Crosspoint B -- 14 SCLK 3-Wire Serial-Interface Clock Input 15 -- SDA 2-Wire Serial-Interface Data Input. Data is clocked in on SCL's rising edge. -- 15 DIN 3-Wire Serial-Interface Data Input. Data is clocked in on SCLK's rising edge. 16 -- A1 LSB+2 of 2-Wire Serial-Interface Address Field -- 16 DOUT 17 17 Q2 18 18 COM1B 19 19 Q3 20 20 COM1A 21 21 GND Ground 22 22 NO1A Input 1 to Crosspoint A 23 23 NO1B Input 1 to Crosspoint B 25 25 V- 26 26 NO2A Input 2 to Crosspoint A 27 27 NO2B Input 2 to Crosspoint B 28 28 SA Data Output of 3-Wire Interface. Input data is clocked out and SCLK's falling edge delayed by 16 clock cycles. DOUT remains active when CS is high. Auxiliary Output 2 Output 1 of Crosspoint A Auxiliary Output 3 Output 1 of Crosspoint A Negative Supply Voltage. Supply range is from -5.25V to 0. Shunt Input to Crosspoint A. Use for shunt capacitor or AC ground connection to improve off-isolation, or as an additional input to switch matrix A. _______________________________________________________________________________________ 9 MAX4550/MAX4570 Pin Description MAX4550/MAX4570 Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches Detailed Description The MAX4550/MAX4570 are serial-interface, programmable, dual 4x2 audio/video crosspoint switches. Each device contains two independent 4x2 crosspoint switches, controlled through the on-chip serial interface. The MAX4550 uses a 2-wire I2C-compatible serial communications protocol, while the MAX4570 uses a 3-wire SPI/QSPI/MICROWIRE-compatible serial communications protocol. These ICs include four controllable auxiliary outputs, each capable of sourcing 1mA or sinking 12mA. Also included are four selectable bias-resistor networks (one for each output) for use with AC-coupled input signals. Both devices operate with either 5V dual supplies or a single +5V supply, and are optimized for use in the audio frequency range to 20kHz and at video frequencies up to 4MHz. They feature 80 on-resistance, 10 on-resistance matching between channels, 5 onresistance flatness, and as low as 0.004% total harmonic distortion. The MAX4550/MAX4570 offer better than -110dB of audio off-isolation, -95dB of audio crosstalk, -78dB of video off-isolation, and -54dB of video crosstalk (4MHz). The SA and SB (shunt) inputs further improve off-isolation, allowing for the addition of external shunt capacitors or the connection of outputs to AC grounds. These devices feature a clickless operation mode for noiseless audio switching. Clickless or standard switching mode is selectable for each individual output using the serial interface. __________ Applications Information The MAX4550/MAX4570 are divided into five functional blocks: the control-logic block, two switch-matrix blocks, the bias-resistor block, and the auxiliary-output block (see Functional Diagram). The control-logic block accepts commands via the serial interface and uses those commands to control the four remaining blocks. Command-Byte and Data-Byte Programming The devices are programmed through their serial interface with a command byte followed by a data byte. Each bit of the command byte selects one of the functional blocks to be controlled by the subsequent data byte. The data byte sets the state of the selected block(s). For the two switch-matrix blocks, the data byte sets the switch state. For the bias-resistor block, the data byte controls which bias network is active. For the auxiliary-output block, the data byte programs the state of the four auxiliary outputs (see Functional Diagram). 10 A logic "1" in any bit position of the data byte makes that function active, while a logic "0" makes it inactive. Tables 1-4 describe the command byte and the corresponding data byte. For example, if bit C4 of the command byte is set, the subsequent data byte programs the state of the auxiliary outputs. If bits D0 and D2 of the subsequent data byte are set, Q0 and Q2 outputs are set high. If more than one bit of the command byte is set, the data byte programs all of the corresponding blocks. This operation is useful, for instance, to simultaneously set both switch matrices to the same configuration. Any block that is not selected in the command byte remains unchanged. Table 1. Command-Byte Format BIT REGISTER C7 Don't care C6 Don't care C5 BIAS/MODE C4 AUX C3 COM2B C2 COM1B C1 COM2A C0 COM1A Table 2. COM Data-Byte Format (C0, C1, C2, C3 = "1") BIT DESCRIPTION D7 Don't care D6 Don't care D5 Don't care D4 Controls the switch connected to S_ ; 1 = close switch, 0 = open switch. D3 Controls the switch connected to NO4_ ; 1 = close switch, 0 = open switch. D2 Controls the switch connected to NO3_ ; 1 = close switch, 0 = open switch. D1 Controls the switch connected to NO2_ ; 1 = close switch, 0 = open switch. D0 Controls the switch connected to NO1_ ; 1 = close switch, 0 = open switch. ______________________________________________________________________________________ Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches BIT DESCRIPTION D7 Don't care D6 Don't care D5 Don't care D4 Don't care D3 Controls output Q3; 1 = set output high, 0 = set output low. D2 Controls output Q2; 1 = set output high, 0 = set output low. D1 Controls output Q1; 1 = set output high, 0 = set output low. D0 Controls output Q0; 1 = set output high, 0 = set output low. Table 4. Clickless Mode/BIAS_ Data-Byte Format (C5 = "1") BIT DESCRIPTION D7 Controls COM2B clickless mode; 1 = enables clickless mode, 0 = disables clickless mode. D6 Controls COM1B clickless mode; 1 = enables clickless mode, 0 = disables clickless mode. D5 Controls COM2A clickless mode; 1 = enables clickless mode, 0 = disables clickless mode. D4 Controls COM1A clickless mode; 1 = enables clickless mode, 0 = disables clickless mode. D3 Controls COM2B bias resistors; 1 = connect bias resistors, 0 = disconnect bias resistors. D2 Controls COM1B bias resistors; 1 = connect bias resistors, 0 = disconnect bias resistors. D1 Controls COM2A bias resistors; 1 = connect bias resistors, 0 = disconnect bias resistors. D0 Controls COM1A bias resistors; 1 = connect bias resistors, 0 = disconnect bias resistors. 2-Wire Serial Interface The MAX4550 uses a 2-wire, fast-mode, I2C-compatible serial interface. This protocol consists of an address byte followed by the command and data bytes. To address a given chip, the A0 and A1 bits in the address byte must duplicate the values present at the A0 and A1 pins of that chip. The rest of the address bits control MAX4550 operation. The command and data-byte details are described in the Command-Byte and Data-Byte Programming section. The 2-wire serial interface requires only two I/O lines of a standard microprocessor port. Figures 1 and 2 detail the timing diagram for signals on the 2-wire bus, and Table 5 details the format of the signals. The MAX4550 is a receive-only device and must be controlled by a bus master device. A bus master device communicates by transmitting the address byte of the slave device over the bus and then transmitting the desired information. Each transmission consists of a start condition, the MAX4550's programmable slave-address byte, a command-byte, a data-byte, and finally a stop condition. The slave device acknowledges the recognition of its address by pulling the SDA line low for one clock period after the address byte is transmitted. The slave device also issues a similar acknowledgment after the command byte and again after the data byte. Start and Stop Conditions The bus-master signals the beginning of a transmission with a start condition by transitioning SDA from high to low while SCL is high. When the master has finished communicating with the slave, it issues a stop condition by transitioning SDA from low to high while SCL is high. The bus is then free for another transmission. Slave Address (Address Byte) The MAX4550 uses an 8-bit-long slave address. To select a slave address, connect A0 and A1 to V+ or GND. The MAX4550 has four possible slave addresses, thus a maximum of four of these devices may share the same 2-bit address bus. The slave device (MAX4550) monitors the serial bus continuously, waiting for a start condition followed by an address byte. When a slave device recognizes its address (10011A 1 A 0 0), it acknowledges that it is ready for further communication by pulling the SDA line low while SCL is high. 3-Wire Serial Interface The MAX4570 3-wire serial interface is SPI/ QSPI/MICROWIRE-compatible. An active-low chipselect (CS) input enables the device to receive data from the serial input (DIN). Data is clocked in on the rising edge of the serial-clock (SCLK) signal. A total of 16 bits are needed in each write cycle. Segmented write cycles are allowed (two 8-bit-wide transfers) if CS remains low. The first bit clocked into the MAX4550 is the command byte's MSB, and the last bit clocked in is the data byte's LSB. While shifting data, the device remains in its original configuration. After all 16 bits are clocked into the input shift register, a rising edge on CS latches the data into the MAX4570 internal registers, initiating the device's change of state. ______________________________________________________________________________________ 11 MAX4550/MAX4570 Table 3. AUX_ Data-Byte Format (C4 = "1") MAX4550/MAX4570 Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches Table 5. 2-Wire Serial-Interface Data Format ADDRESS BYTE S R T COMMAND BYTE A 7 A 6 A 5 A 4 A 3 A 2 A 1 A 0 1 0 0 1 1 A 1 A 0 0 A C K DATA BYTE C 7 C 6 C 5 C 4 C 3 C 2 C 1 C 0 X X B I A S A U X C O M 2 B C O M 1 B C O M 2 A C O M 1 A A C K D 7 D 6 D 5 D 4 D 3 D 2 D 1 D 0 D 7 D 6 D 5 D 4 D 3 D 2 D 1 D 0 A C K X = Don't care SRT = Start condition ACK = Acknowledge condition STOP = Stop condition SCL SDA A0 A7 SRT D7 D7 D0 ACK D0 ACK ACK STOP Figure 1. 2-Wire Serial-Interface Timing Diagram A tLOW B tHIGH C E D F G H I J SCL SDA tSU:STA tHD:STA tSU:DAT tHD:DAT A = START CONDITION B = MSB OF ADDRESS BYTE C = LSB OF ADDRESS BYTE D = ACKNOWLEDGE CLOCKED INTO MASTER E = MSB OF COMMAND BYTE tSU:STO tBUF F = LSB OF COMMAND BYTE G = ACKNOWLEDGE CLOCKED INTO MASTER H = MSB OF DATA BYTE I = LSB OF DATA BYTE J = ACKNOWLEDGE CLOCKED INTO MASTER Figure 2. 2-Wire Serial-Interface Timing Details 12 ______________________________________________________________________________________ S T O P Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches CS SCLK 1 DIN 16 C0 C7 COMMAND BYTE D7 D0 DATA BYTE Figure 3. 3-Wire Serial-Interface Communication *** CS tCSH tCSS tCL SCLK tCH tCSH *** tDS tDH *** DIN tDV tDO tTR *** DOUT Figure 4. 3-Wire Serial-Interface Timing Details ______________________________________________________________________________________ 13 MAX4550/MAX4570 Daisy Chaining To program several MAX4570s, "daisy chain" the devices by connecting DOUT of the first device to DIN of the second, and so on. The CS pins of all devices are connected together, and data is shifted through the MAX4570s in series. 16 bits of data per device are required for proper programming of all devices. When CS is brought high, all devices are updated simultaneously. Figures 3, 4, and Table 6 show the details of the 3-wire protocol, as it applies to the MAX4570. DOUT is the shift register's output. Data at DOUT is simply the input data delayed by 16 clock cycles, with data appearing synchronous with SCLK's falling edge. Transitions at DIN and SCLK have no effect when CS is high, and DOUT holds the last bit in the shift register. MAX4550/MAX4570 Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches Table 6. 3-Wire Serial-Interface Data Format COMMAND BYTE DATA BYTE MSB LSB C7 C6 C5 C4 C3 C2 C1 C0 D7 D6 D5 D4 D3 D2 D1 D0 X X BIAS AUX COM2B COM1B COM2A COM1A D7 D6 D5 D4 D3 D2 D1 D0 X = Don't care Addressable Serial Interface To program several MAX4570s individually using a single processor, connect DIN of each MAX4570 together and control CS on each MAX4570 separately. To select a particular device, drive the corresponding CS low, clock in the 16-bit command, then drive CS high and execute the command. Typically, only one MAX4570 is addressed at a time. Using the Auxiliary Outputs The four auxiliary outputs provide a way to control external circuitry, such as LEDs or other DC loads, through the serial interface. Program these outputs via bit C4 of the command byte. Each output is capable of sourcing 1mA or sinking 12mA. They are programmed through the command byte and data byte (refer to Tables 1, 3, and the Functional Diagram). Improving Off-Isolation Clickless Switching To improve off-isolation, connect the SA or SB input to ground either directly (DC ground) or through capacitors (AC ground). Closing SA or SB effectively grounds the unused outputs. Audible switching transients ("clicks") are eliminated in this mode of operation. When an output is configured as "clickless," the gate signal of the switches connected to that output are controlled with slow-moving voltages. As a result, the output slew rates are significantly reduced. Program clickless operation via bit C5 of the command byte (refer to Tables 1, 4, and the Functional Diagram). Each operating switch may draw as much as 2mA during transition. Using the Internal Bias Resistors Use the internal bias-resistor networks to give the switch outputs a DC bias when the switch terminals are AC coupled. Programming of the switches that connect the bias resistors to the outputs is accomplished via bit C5 of the command byte. Connect the BIASH and BIASL inputs to DC levels (for example, V+ and GND), and activate the switch connecting the appropriate output. This applies a voltage midway between VBIASH and VBIASL to the output (refer to Tables 1, 4, and the Functional Diagram). 14 Power-Up State The MAX4550/MAX4570 feature a preset power-up state. Upon power-up, COM1A and COM2A are connected to SA, COM1B and COM2B are connected to SB, all outputs are set to clickless mode, all bias-resistor networks are disconnected from the outputs, and all auxiliary outputs are low. All other switches are open. ______________________________________________________________________________________ Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches NO1A NO2A NO3A NO4A SA 22 26 MAX4550 MAX4570 2 6 28 20 9 SWITCH MATRIX `A' NO1B NO2B NO3B NO4B SB V+ VGND COM1A COM2A 23 27 3 7 1 18 11 SWITCH MATRIX `B' 8, 24 25 4 COM1B COM2B BIASH 21 10 10 4 SDA/(DIN) SCL/(SCLK) A0/(CS) A1/(DOUT) 15 14 13 5 CONTROL LOGIC BIASL BIAS RESISTOR NETWORK 16 4 10 12 17 19 SWITCH STATES SHOWN IN POWER-UP STATE. AUXILIARY OUTPUTS ARE LOW IN POWER-UP STATE. Q0 Q1 Q2 Q3 AUXILIARY OUTPUTS ( ) ARE FOR MAX4570 ______________________________________________________________________________________ 15 MAX4550/MAX4570 Functional Diagram Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches SSOP.EPS MAX4550/MAX4570 Package Information Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.