Low Cost 6-Channel HD/SD Video Filter ADA4420-6 FEATURES FUNCTIONAL BLOCK DIAGRAM INSD1 SD x2 x1 SD x2 x1 SD x2 x1 HD x2 x1 HD x2 x1 HD x2 OUTSD1 CLAMP INSD2 OUTSD2 CLAMP INSD3 DIS OUTSD3 CLAMP INHD1 APPLICATIONS Set-top boxes DVD players and recorders HDTVs Projectors Personal video recorders x1 OUTHD1 CLAMP INHD2 OUTHD2 CLAMP INHD3 CLAMP ADA4420-6 OUTHD3 07532-001 Sixth-order filters Transparent input sync tip clamp -1 dB bandwidth of 26 MHz typical for HD HD rejection @ 75 MHz: 48 dB typical NTSC differential gain: 0.19% NTSC differential phase: 0.76 Rail-to-rail outputs Low quiescent current: 32 mA typical Disable feature Output dc offset Figure 1. GENERAL DESCRIPTION The ADA4420-6 is a low cost video reconstruction filter specifically designed for consumer applications. It consists of six independent sixth-order Butterworth filters/buffers, three for standard definition (Y/C or CVBS) and three for high definition component signals (YPrPb or RGB). The ADA4420-6 operates from a single 5 V supply and has a low quiescent current of 32 mA, making it ideal for applications where power consumption is critical. A disable feature allows for further power conservation by reducing the supply current to less than 8 A typical when the device is not in use. Each channel features a transparent sync tip clamp, allowing ac coupling of the inputs without requiring dc restoration. The output drivers on the ADA4420-6 have rail-to-rail output capabilities with 6 dB gain. A built-in offset of 250 mV allows the outputs to be dc-coupled, eliminating the need for large coupling capacitors. Each output is capable of driving two 75 doubly terminated cables. The ADA4420-6 is available in either a 16-lead QSOP or a 20-lead TSSOP, and operates in the extended industrial temperature range of -40C to +85C. Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2008-2011 Analog Devices, Inc. All rights reserved. ADA4420-6 TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................7 Applications....................................................................................... 1 Test Circuits..................................................................................... 10 General Description ......................................................................... 1 Applications Information .............................................................. 11 Functional Block Diagram .............................................................. 1 Overview ..................................................................................... 11 Revision History ............................................................................... 2 Disable ......................................................................................... 11 Specifications..................................................................................... 3 Input and Output Coupling ...................................................... 11 Absolute Maximum Ratings............................................................ 4 Printed Circuit Board (PCB) Layout ....................................... 11 Thermal Resistance ...................................................................... 4 Video Encoder Reconstruction Filter...................................... 11 Maximum Power Dissipation ..................................................... 4 Outline Dimensions ....................................................................... 13 ESD Caution.................................................................................. 4 Ordering Guide .......................................................................... 14 Pin Configuration and Function Descriptions............................. 5 REVISION HISTORY 5/11--Rev. 0 to Rev. A Added 20-Lead TSSOP Package .......................................Universal Changes to General Description Section ...................................... 1 Changes to Disable Assert Voltage, Disable Assert Time, Disable De-Assert Time Parameters ............................................................ 3 Changes to Table 3, Maximum Power Dissipation Section, and Figure 2....................................................................................... 4 Added Figure 4 and Table 5............................................................. 6 Changes to Figure 18, Figure 19, and Figure 20 ......................... 10 Updated Outline Dimensions ....................................................... 13 Changes to Ordering Guide .......................................................... 14 8/08--Revision 0: Initial Version Rev. A | Page 2 of 16 ADA4420-6 SPECIFICATIONS VS = 5 V, TA = 25C, VO = 2.0 V p-p, RL = 150 , dc-coupled inputs, ac-coupled outputs, unless otherwise noted. See Figure 18, Figure 19, and Figure 20 for the test circuits. Table 1. Parameter OVERALL PERFORMANCE DC Voltage Gain Input Voltage Range, All Inputs Output Voltage Range, All Outputs Linear Output Current per Channel Filter Input Bias Current SD CHANNEL DYNAMIC PERFORMANCE -1 dB Bandwidth -3 dB Bandwidth Out-of-Band Rejection Crosstalk Total Harmonic Distortion Signal-to-Noise Ratio Propagation Delay Group Delay Variation Differential Gain Differential Phase HD CHANNEL DYNAMIC PERFORMANCE -1 dB Bandwidth -3 dB Bandwidth Out-of-Band Rejection Crosstalk Total Harmonic Distortion Signal-to-Noise Ratio Propagation Delay Group Delay Variation DC CHARACTERISTICS Operating Voltage Quiescent Supply Current PSRR Output DC Offset Disable Assert Voltage Disable Assert Time Disable De-Assert Time Disable Input Bias Current Input-to-Output Isolation Test Conditions/Comments Min Typ Max Unit All channels 5.8 6.0 0 to 2.1 0.25 to 4.6 30 1 6.2 dB V V mA A f = 27 MHz f = 1 MHz f = 1 MHz, VO = 1.4 V p-p, dc-coupled outputs f = 100 kHz to 6 MHz, unweighted 8.5 42 f = 100 kHz to 5 MHz NTSC; ac-coupled inputs, dc-coupled outputs; see Figure 19 NTSC; ac-coupled inputs, dc-coupled outputs; see Figure 19 f = 75 MHz f = 1 MHz f = 10 MHz, VO = 1.4 V p-p, dc-coupled outputs f = 100 kHz to 30 MHz, unweighted 27 43 f = 100 kHz to 30 MHz Active, DIS = 1 Disabled, DIS = 0 HD channel, referred to output SD channel, referred to output All channels DIS = 0 to 1 DIS = 0 to 1 DIS = 1 to 0 Disabled, DIS = 0 Disabled, DIS = 0, f = 5 MHz Rev. A | Page 3 of 16 35 40 135 8.6 10 45 -68 0.02 70 57 16 0.19 MHz MHz dB dB % dB ns ns % 0.76 Degrees 26 31 48 -68 0.57 66 15 11 MHz MHz dB dB % dB ns ns 4.75 to 5.25 32 7 41 45 250 20 450 -6.8 -96 36 13 375 1.9 V mA A dB dB mV V ns ns A dB ADA4420-6 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Power Dissipation Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering, 10 sec) Junction Temperature Rating 5.5 V See Figure 2 -65C to +125C -40C to +85C 300C 150C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. The power dissipated in the package (PD) is the sum of the quiescent power dissipation and the power dissipated in the package due to the load drive for all outputs. The quiescent power is the voltage between the supply pins (VS) times the quiescent current (IS). The power dissipated due to load drive depends on the particular application. For each output, the power due to load drive is calculated by multiplying the load current by the associated voltage drop across the device. The power dissipated due to the loads is equal to the sum of the power dissipations due to each individual load. RMS voltages and currents must be used in these calculations. Airflow increases heat dissipation, effectively reducing JA. Figure 2 shows the maximum power dissipation in the package vs. the ambient temperature for the 16-lead QSOP (105C/W) and the 20-lead TSSOP (143C/W) on a JEDEC standard 4-layer board. JA values are approximate. 2.0 THERMAL RESISTANCE MAXIMUM POWER DISSIPATION (W) 1.8 JA is specified for the device soldered to a high thermal conductivity 4-layer (2s2p) circuit board, as described in EIA/JESD 51-7. Table 3. JA 105 143 JC 23 45 Unit C/W C/W 1.4 16-LEAD QSOP 1.2 1.0 0.8 20-LEAD TSSOP 0.6 0.4 0.2 MAXIMUM POWER DISSIPATION The maximum safe power dissipation in the ADA4420-6 package is limited by the associated rise in junction temperature (TJ) on the die. At approximately 150C, which is the glass transition temperature, the plastic changes its properties. Even temporarily exceeding this temperature limit can change the stresses that the package exerts on the die, permanently shifting the parametric performance of the ADA4420-6. Exceeding a junction temperature of 150C for an extended time can result in changes in the silicon devices, potentially causing failure. 0 0 10 20 30 40 50 60 70 80 AMBIENT TEMPERATURE (C) Figure 2. Maximum Power Dissipation vs. Ambient Temperature for a 4-Layer Board ESD CAUTION Rev. A | Page 4 of 16 90 100 07532-016 Package Type 16-Lead QSOP 20-Lead TSSOP 1.6 ADA4420-6 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS INSD1 1 16 OUTSD1 INSD2 2 15 OUTSD2 INSD3 3 VCC 4 ADA4420-6 13 GND DIS 5 TOP VIEW (Not to Scale) 12 GND INHD1 6 11 OUTHD1 INHD2 7 10 OUTHD2 INHD3 8 14 OUTSD3 OUTHD3 07532-002 9 Figure 3. 16-Lead QSOP Pin Configuration Table 4. 16-Pin QSOP Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Mnemonic INSD1 INSD2 INSD3 VCC DIS INHD1 INHD2 INHD3 OUTHD3 OUTHD2 OUTHD1 GND GND OUTSD3 OUTSD2 OUTSD1 Description Standard Definition Input 1 Standard Definition Input 2 Standard Definition Input 3 Power Supply Disable/Power-Down Input High Definition Input 1 High Definition Input 2 High Definition Input 3 High Definition Output 3 High Definition Output 2 High Definition Output 1 Ground Ground Standard Definition Output 3 Standard Definition Output 2 Standard Definition Output 1 Rev. A | Page 5 of 16 ADA4420-6 INSD1 1 20 OUTSD1 INSD2 2 19 INSD3 3 18 OUTSD3 NC 4 DIS 6 17 GND ADA4420-6 TOP VIEW (Not to Scale) 16 GND 15 NC INHD1 7 14 OUTHD1 INHD2 8 13 OUTHD2 INHD3 9 NC 10 12 OUTHD3 11 NC NC = NO CONNECT. DO NOT CONNECT TO THIS PIN. 07532-003 VCC 5 OUTSD2 Figure 4. 20-Lead TSSOP Pin Configuration Table 5. 20-lead TSSOP Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Mnemonic INSD1 INSD2 INSD3 NC VCC DIS INHD1 INHD2 INHD3 NC NC OUTHD3 OUTHD2 OUTHD1 NC GND GND OUTSD3 OUTSD2 OUTSD1 Description Standard Definition Input 1. Standard Definition Input 2. Standard Definition Input 3. Do not connect to this pin. Power Supply. Disable/Power Down Input. High Definition Input 1. High Definition Input 2. High Definition Input 3. Do not connect to this pin. Do not connect to this pin. High Definition Output 3. High Definition Output 2. High Definition Output 1. No Connection. Ground. Ground. Standard Definition Output 3. Standard Definition Output 2. Standard Definition Output 1. Rev. A | Page 6 of 16 ADA4420-6 TYPICAL PERFORMANCE CHARACTERISTICS VS = 5 V, TA = 25C, VO = 2.0 V p-p, RL = 150 , dc-coupled inputs, ac-coupled outputs, unless otherwise noted. See Figure 18, Figure 19, and Figure 20 for the test circuits. 10 NORMALIZED GAIN (dB) SD CHANNELS, RL = 75 -20 -30 SD CHANNELS, RL = 150 -40 -50 -60 0 -1.0 -1.5 -2.0 -3.0 1 0 0.5 NORMALIZED GAIN (dB) -10 -30 -40 -50 HD -40C HD +25C HD +85C SD -40C SD +25C SD +85C 0 -0.5 -1.0 -1.5 HD -40C HD +25C HD +85C SD -40C SD +25C SD +85C -2.0 -2.5 100 FREQUENCY (MHz) -3.0 07532-005 10 1 Figure 6. Frequency Response vs. Temperature Figure 9. Flatness vs. Temperature 10 0 0 -10 -10 -20 -20 GAIN (dB) 10 -30 -40 HD DC-COUPLED HD AC-COUPLED -30 -40 -50 -50 -60 -60 SD VO = 100mV p-p SD VO = 2.0V p-p HD VO = 100mV p-p HD VO = 2.0V p-p -70 1 SD AC-COUPLED -70 10 100 FREQUENCY (MHz) 07532-006 GAIN (dB) 10 FREQUENCY (MHz) -80 SD DC-COUPLED 1 10 100 FREQUENCY (MHz) Figure 10. Frequency Response vs. Output Coupling Figure 7. Frequency Response vs. Amplitude Rev. A | Page 7 of 16 07532-017 GAIN (dB) -20 1 100 Figure 8. Flatness vs. Load (RL) 1.0 -70 100 FREQUENCY (MHz) 10 -60 10 07532-007 100 Figure 5. Frequency Response vs. Load (RL) -80 HD CHANNELS, RL = 150 SD CHANNELS, RL = 150 -0.5 07532-008 10 07532-004 1 FREQUENCY (MHz) -80 HD CHANNELS, RL = 75 -2.5 -70 -80 SD CHANNELS, RL = 75 0.5 HD CHANNELS, RL = 150 -10 GAIN (dB) 1.0 HD CHANNELS, RL = 75 0 ADA4420-6 6 100 90 5 SD CHANNELS 4 70 DIS VOLTAGE (V) 60 50 SD CHANNELS 40 30 2 HD CHANNELS 1 HD CHANNELS 20 3 1 10 100 FREQUENCY (MHz) -1 -600 07532-009 0 0.1 -400 0 200 400 600 800 1000 1200 80 100 TIME (ns) Figure 13. Enable Time Figure 11. Group Delay vs. Frequency 10k -200 07532-012 0 10 07532-013 GROUP DELAY (ns) 80 36 DIS = 0 SUPPLY CURRENT (mA) 1k 100 34 33 32 31 30 29 10 0.1 1 10 FREQUENCY (MHz) 100 07532-011 OUTPUT IMPEDANCE () 35 28 -60 -40 -20 0 20 40 60 TEMPERATURE (C) Figure 14. Supply Current vs. Temperature Figure 12. Output Impedance vs. Frequency Rev. A | Page 8 of 16 ADA4420-6 4.70 -10 4.68 OUTPUT SATURATION VOLTAGE (V) 0 -30 -40 -50 -60 SD CHANNELS -70 HD CHANNELS -90 0.1 1 10 100 1000 FREQUENCY (MHz) 6 5 HD CHANNELS 1 0 -1 -200 -160 -120 -80 -40 0 40 TIME (ns) 80 120 160 200 07532-015 DIS VOLTAGE (V) SD CHANNELS 3 2 4.62 4.60 4.58 4.56 4.54 4.50 -60 -40 -20 0 20 40 60 80 TEMPERATURE (C) Figure 17. Output Saturation Voltage vs. Temperature Figure 15. Crosstalk vs. Frequency 4 4.64 4.52 07532-014 -80 4.66 Figure 16. Disable Time Rev. A | Page 9 of 16 100 07532-010 CROSSTALK (dB) -20 ADA4420-6 TEST CIRCUITS AGILENT E3631A POWER SUPPLY + 25V COM - VCC GND DIS +6V + - ADA4420-6 TEST CIRCUIT (SEE FIGURE 18) VCC 0.1F INxDx 10F OUTxDx 50 PORT 1 220F ADA4420-6 49.9 VOUT 118 07532-018 86.6 GND DIS AGILENT 8753D VECTOR NETWORK ANALYZER Figure 18. DC-Coupled Input, AC-Coupled Output Figure 20. Test Circuit for Frequency Response and Group Delay VCC 0.1F 49.9 0.1F 10F ADA4420-6 VOUT 118 86.6 DIS GND 07532-019 VIN PORT 2 BIAS CONNECT PORT 1 07532-020 VIN Figure 19. AC-Coupled Input, DC-Coupled Output Rev. A | Page 10 of 16 ADA4420-6 APPLICATIONS INFORMATION OVERVIEW ADA4420-6 220F 75 CABLE 75 220F 75 CABLE 75 75 07532-022 With its high impedance inputs and high output drive, the ADA4420-6 is ideally suited to video reconstruction and antialias filtering applications. The high impedance inputs give designers flexibility with regard to how the input signals are terminated. Devices with DAC current source outputs that feed the ADA4420-6 can be loaded in whatever resistance provides the best performance, and devices with voltage outputs can be optimally terminated as well. The ADA4420-6 outputs can each drive up to two source-terminated, 75 loads and; therefore, can directly drive the outputs from set-top boxes and DVDs without the need for a separate output buffer. 75 Figure 21. Driving Two AC-Coupled Loads with Two Coupling Capacitors ADA4420-6 75 75 CABLE 470F 75 75 75 CABLE The ADA4420-6 includes a disable feature that can be used to save power when a particular device is not in use. When disabled, the ADA4420-6 typically draws only 7 A from the supply. The disable feature is asserted by pulling the DIS pin low. Table 6 summarizes the operation of the disable feature. Table 6. Disable Function DIS Pin Connection Status VCC or Floating GND Enabled Disabled INPUT AND OUTPUT COUPLING Inputs to the ADA4420-6 can be ac- or dc-coupled. For dc-coupled inputs, the signal must be completely contained within the input range of 0 V to 2.1 V. When using ac-coupled inputs, the lowest point of the signal is clamped to approximately 0 V. The ADA4420-6 outputs can be either ac- or dc-coupled. When driving single ac-coupled loads in standard 75 video distribution systems, a minimum capacitance of 220 F is recommended to avoid line and field droop. There are two ac coupling options when driving two loads from one output. One option simply uses the same value capacitor on the second load, while the other option uses a common coupling capacitor that is at least twice the value used for the single load (see Figure 21 and Figure 22). When driving two parallel 150 loads (75 effective load), the 3 dB bandwidth of the filters typically varies from that of the filters with a single 150 load (see Figure 5). 75 07532-023 DISABLE Figure 22. Driving Two AC-Coupled Loads with One Common Coupling Capacitor PRINTED CIRCUIT BOARD (PCB) LAYOUT As with all high speed applications, attention to the PCB layout is of paramount importance. When designing with the ADA4420-6, adhere to standard high speed layout practices. A solid ground plane is recommended, and surface-mount, ceramic power supply decoupling capacitors should be placed as close as possible to the supply pins. Connect all of the ADA4420-6 GND pins to the ground plane with traces that are as short as possible. Controlled impedance traces of the shortest length possible should be used to connect to the signal I/O pins and should not pass over any voids in the ground plane. A 75 impedance level is typically used in video applications. When driving transmission lines, include series termination resistors on the signal outputs of the ADA4420-6. When the ADA4420-6 receives its inputs from a device with current outputs, the required load resistor value for the output current is often different from the characteristic impedance of the signal traces. In this case, if the interconnections are short (<< 0.1 wavelength), the trace does not have to be terminated in its characteristic impedance. Traces of 75 can be used in this instance, provided their lengths are an inch or two at most. This is easily achieved because the ADA4420-6 and the device feeding it are usually adjacent to each other, and connections can be made that are less than one inch in length. VIDEO ENCODER RECONSTRUCTION FILTER The ADA4420-6 is easily applied as a reconstruction filter at the DAC outputs of a video encoder. Figure 23 illustrates how to use the ADA4420-6 in this type of application following an ADV734x series video encoder, with a single-supply and ac-coupled outputs. Rev. A | Page 11 of 16 ADA4420-6 x2 x1 HD x2 x1 HD x2 220F 75 OUTHD1 + HD OUTHD2 + x1 220F 75 OUTHD3 + INHD1 DAC 1 220F 75 OUTSD1 + MULTIFORMAT VIDEO ENCODER 220F 75 OUTSD2 + ADV734x 220F 75 OUTSD3 220F 75 Y 300 INHD2 DAC 2 Pb 300 INHD3 DAC 3 Pr 300 ADA4420-6 DIS INSD1 DAC 4 x1 SD x2 x1 SD x2 CVBS 300 INSD2 DAC 5 300 DAC 6 RSET2 4.12k x1 SD x2 300 4.12k 07532-021 RSET1 + S-VIDEO INSD3 Figure 23. The ADA4420-6 Applied as a Reconstruction Filter Following an ADV734x Series Video Encoder Rev. A | Page 12 of 16 ADA4420-6 OUTLINE DIMENSIONS 0.197 (5.00) 0.193 (4.90) 0.189 (4.80) 16 9 1 0.158 (4.01) 0.154 (3.91) 0.150 (3.81) 8 0.010 (0.25) 0.006 (0.15) 0.069 (1.75) 0.053 (1.35) 0.065 (1.65) 0.049 (1.25) 0.010 (0.25) 0.004 (0.10) COPLANARITY 0.004 (0.10) 0.244 (6.20) 0.236 (5.99) 0.228 (5.79) SEATING PLANE 0.025 (0.64) BSC 8 0 0.012 (0.30) 0.008 (0.20) 0.050 (1.27) 0.016 (0.41) 0.020 (0.51) 0.010 (0.25) 0.041 (1.04) REF 01-28-2008-A COMPLIANT TO JEDEC STANDARDS MO-137-AB CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 24. 16-Lead Shrink Small Outline Package [QSOP] (RQ-16) Dimensions shown in inches and (millimeters) 6.60 6.50 6.40 20 11 4.50 4.40 4.30 6.40 BSC 1 10 PIN 1 0.65 BSC 1.20 MAX 0.15 0.05 COPLANARITY 0.10 0.30 0.19 0.20 0.09 SEATING PLANE 8 0 COMPLIANT TO JEDEC STANDARDS MO-153-AC Figure 25. 20-Lead Thin Shrink Small Outline Package [TSSOP] (RU-20) Dimensions shown in millimeters Rev. A | Page 13 of 16 0.75 0.60 0.45 ADA4420-6 ORDERING GUIDE Model 1 ADA4420-6ARQZ ADA4420-6ARQZ-R7 ADA4420-6ARQZ-RL ADA4420-6ARUZ ADA4420-6ARUZ-R7 ADA4420-6ARUZ-RL 1 Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package Description 16-Lead Shrink Small Outline Package (QSOP) 16-Lead Shrink Small Outline Package (QSOP) 16-Lead Shrink Small Outline Package (QSOP) 20-Lead Thin Shrink Small Outline Package (TSSOP) 20-Lead Thin Shrink Small Outline Package (TSSOP) 20-Lead Thin Shrink Small Outline Package (TSSOP) Z = RoHS Compliant Part. Rev. A | Page 14 of 16 Package Option RQ-16 RQ-16 RQ-16 RU-20 RU-20 RU-20 Ordering Quantity Tube (98) 1,000 2,500 Tube (75) 1,000 2,500 ADA4420-6 NOTES Rev. A | Page 15 of 16 ADA4420-6 NOTES (c)2008-2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07532-0-5/11(A) Rev. A | Page 16 of 16