PGA2320 SBOS312B - JULY 2004 - REVISED DECEMBER 2004 Stereo Audio Volume Control FEATURES D DIGITALLY-CONTROLLED ANALOG VOLUME CONTROL: Two Independent Audio Channels Serial Control Interface Zero Crossing Detection Mute Function D WIDE GAIN AND ATTENUATION RANGE: +31.5dB to -95.5dB with 0.5dB Steps D LOW NOISE AND DISTORTION: D 120dB Dynamic Range 0.0003% THD+N at 1kHz LOW INTERCHANNEL CROSSTALK: -126dBFS NOISE-FREE LEVEL TRANSITIONS POWER SUPPLIES: +15V Analog, +5V Digital D D D AVAILABLE IN SOL-16 PACKAGE D PIN-FOR-PIN COMPATIBLE WITH THE PGA2310 APPLICATIONS D D D D D D D D AUDIO AMPLIFIERS MIXING CONSOLES MULTI-TRACK RECORDERS BROADCAST STUDIO EQUIPMENT MUSICAL INSTRUMENTS EFFECTS PROCESSORS A/V RECEIVERS CAR AUDIO SYSTEMS DESCRIPTION The PGA2320 is a high-performance, stereo audio volume control designed for professional and high-end consumer audio systems. The ability to operate from 15V analog power supplies enables the PGA2320 to process input signals with large voltage swings, thereby preserving the dynamic range available in the overall signal path. Using high performance operational amplifier stages internal to the PGA2320 yields low noise and distortion, while providing the capability to drive 600 loads directly without buffering. The three-wire serial control interface allows for connection to a wide variety of host controllers, in addition to support for daisy-chaining of multiple PGA2320 devices. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. Copyright 2004, Texas Instruments Incorporated ! ! www.ti.com " #$#% www.ti.com SBOS312B - JULY 2004 - REVISED DECEMBER 2004 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range unless otherwise noted(1) PGA2320 UNIT VA+ VA- +15.5 V -15.5 V VD+ +5.5 V Analog input voltage 0 to VA+, VA- V Digital input voltage -0.3 to VD+ V Operating temperature range -40 to +85 C Storage temperature range -65 to +150 C Junction temperature +150 C Lead temperature (soldering, 10s) +300 C Supply voltage Package temperature (IR, reflow, 10s) +235 C (1) Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not implied. PACKAGE/ORDERING INFORMATION For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet. 2 " #$#% www.ti.com SBOS312B - JULY 2004 - REVISED DECEMBER 2004 ELECTRICAL CHARACTERISTICS At TA = +25C, VA+ = +15V, VA- = -15V, VD+ = +5V, RL = 100k, CL = 20pF, BW measure = 20Hz to 20kHz, unless otherwise noted. PGA2320 PARAMETER TEST CONDITIONS MIN TYP MAX UNIT DC CHARACTERISTICS Step Size Gain Error Gain Setting = 31.5dB 0.5 dB 0.1 dB 0.1 dB Input Resistance 12 k Input Capacitance 18 pF Gain Matching AC CHARACTERISTICS THD+N Dynamic Range VIN = 10VPP, f = 1kHz VIN = AGND, Gain = 0dB Voltage Range, Input and Output Output Noise Interchannel Crosstalk 0.0003 115 120 (VA-) + 0.86 VIN = AGND, Gain = 0dB f = 1kHz 0.001 10.5 % dB (VA+) - 0.86 17.5 -126 V VRMS dBFS OUTPUT BUFFER Offset Voltage VIN = AGND, Gain = 0dB 1 Load Capacitance Stability 7.5 1000 mV pF Short-Circuit Current 75 mA Unity-Gain Bandwidth, Small Signal 1 MHz DIGITAL CHARACTERISTICS High-Level Input Voltage, VIH +2.0 Low-Level Input Voltage, VIL -0.3 High-Level Output Voltage, VOH Low-Level Output Voltage, VOL IO = 200A IO = -2mA VD+ 0.8 (VD+) - 1.0 Input Leakage Current V V V 1 0.4 V 10 A 6.25 MHz SWITCHING CHARACTERISTICS Serial Clock (SCLK) Frequency tSCLK tPH 80 ns Serial Clock (SCLK) Pulse Width High tPL 80 ns MUTE Pulse Width Low tMI 2.0 ms tSDS tSDH 20 ns 20 ns tCSCR tCFCS 90 ns 35 ns Serial Clock (SCLK) Pulse Width Low 0 Input Timing SDI Setup Time SDI Hold Time CS Falling to SCLK Rising SCLK Falling to CS Rising Output Timing CS Low to SDO Active SCLK Falling to SDO Data Valid tCSO tCFDO 35 ns 60 ns POWER SUPPLY Operating Voltage VA+ VA- VD+ Quiescent Current +4.5 +15 +15.5 V -4.5 -15 -15.5 V +4.5 +5 +5.5 V IA+ IA- VA+ = +15V VA- = -15V 11 16 mA 11 16 mA ID+ VD+ = +5V 0.6 1.5 mA 3 " #$#% www.ti.com SBOS312B - JULY 2004 - REVISED DECEMBER 2004 PIN CONFIGURATION PIN ASSIGNMENTS Top View ZCEN 16 VINL NAME FUNCTION 1 ZCEN Zero Crossing Enable Input (Active High) 2 CS Chip-Select Input (Active Low) 3 SDI Serial Data input 4 Digital Power Supply, +5V 5 VD+ DGND 6 SCLK Serial Clock Input Digital Ground CS 2 15 AGNDL SDI 3 14 VOUTL 7 SDO Serial Data Output VD+ 4 13 VA- 8 MUTE Mute Control Input (Active Low) 9 VINR AGNDR Analog Input, Right Channel Analog Output, Right Channel PGA2320 DGND 5 12 VA+ SCLK 6 11 VOUTR 11 SDO 7 10 AGNDR 12 VOUTR VA+ 13 VA- Analog Power Supply, -15V 14 Analog Output, Left Channel 15 VOUTL AGNDL 16 VINL MUTE 4 1 PIN 8 9 VINR 10 Analog Ground, Right Channel Analog Power Supply, +15V Analog Ground, Left Channel Analog Input, Left Channel " #$#% www.ti.com SBOS312B - JULY 2004 - REVISED DECEMBER 2004 TYPICAL CHARACTERISTICS At TA = +25C, VA+ = +15V, VA- = -15V, VD+ = +5V, RL = 100k, CL = 20pF, BW measure = 20Hz to 20kHz, unless otherwise noted. THD+N vs INPUT AMPLITUDE (Gain = 0dB, f = 1kHz) FREQUENCY RESPONSE (0dB = 6.0VRMS) GAIN = 0dB 0.1 1.0 0.8 0.6 0.01 0.2 THD+N (%) Amplitude (dB) 0.4 0 -0.2 -0.4 0.001 -0.6 -0.8 -1.0 10 100 1k 10k 0.0001 100m 100k 200k 1 THD+N vs INPUT FREQUENCY (Gain = 0dB, Amplitude = 3.0VRMS , RL = 100k) THD+N vs INPUT FREQUENCY (Gain = 0dB, Amplitude = 3.0VRMS , RL = 600) 0.01 THD+N (%) THD+N (%) 0.01 0.001 0.0001 0.001 0.0001 20 100 1k 10k 20k 20 100 1k 10k Input Frequency (Hz) Input Frequency (Hz) THD+N vs INPUT FREQUENCY (Gain = 0dB, Amplitude = 8.5VRMS , RL = 100k) THD+N vs INPUT FREQUENCY (Gain = 0dB, Amplitude = 8.5VRMS , RL = 600) 20k 0.01 THD+N (%) 0.01 THD+N (%) 10 Input Amplitude (VRMS) Frequency (Hz) 0.001 0.0001 0.001 0.0001 20 100 1k Input Frequency (Hz) 10k 20k 20 100 1k 10k 20k Input Frequency (Hz) 5 " #$#% www.ti.com SBOS312B - JULY 2004 - REVISED DECEMBER 2004 TYPICAL CHARACTERISTICS (continued) At TA = +25C, VA+ = +15V, VA- = -15V, VD+ = +5V, RL = 100k, CL = 20pF, BW measure = 20Hz to 20kHz, unless otherwise noted. Crosstalk (dB) CROSSTALK OR CHANNEL SEPARATION vs INPUT FREQUENCY (Gain = 0dB, Amplitude = 8.5VRMS) 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 20 100 1k Input Frequency (Hz) 6 10k 20k " #$#% www.ti.com SBOS312B - JULY 2004 - REVISED DECEMBER 2004 GENERAL DESCRIPTION The PGA2320 is a stereo audio volume control. It may be used in a wide array of professional and consumer audio equipment. The PGA2320 is fabricated in a mixed-signal BiCMOS process in order to take advantage of the superior analog characteristics that the process offers. The heart of the PGA2320 is a resistor network, an analog switch array, and a high-performance bipolar op amp stage. The switches are used to select taps in the resistor network that, in turn, determine the gain of the amplifier stage. Switch selections are programmed using a serial control port. The serial port allows connection to a wide variety of host controllers. Figure 1 shows a functional block diagram of the PGA2320. ANALOG INPUTS AND OUTPUTS The PGA2320 includes two independent channels, referred to as the left and right channels. Each channel has a corresponding input and output pin. The input and output pins are unbalanced, or referenced to analog ground (either AGNDR or AGNDL). The inputs are named VINR (pin 9) and VINL (pin 16), while the outputs are named VOUTR (pin 11) and VOUTL (pin 14). It is important to drive the PGA2320 with a low source impedance. If a source impedance of greater than 600 is used, the distortion performance of the PGA2320 will begin to degrade. POWER-UP STATE On power up, all internal flip-flops are reset. The gain byte value for both the left and right channels are set to 00HEX, or mute condition. The gain will remain at this setting until the host controller programs new settings for each channel via the serial control port. VINL 16 14 8 VOUTL MUTE MUX 8 1 8 AGNDL AGNDR 2 15 Serial Control Port 10 6 3 7 ZCEN CS SCLK SDI SDO 8 8 MUX 11 VINR 9 12 VA+ 13 VA - 4 VOUTR 5 VD+ DGND Figure 1. PGA2320 Block Diagram 7 " #$#% www.ti.com SBOS312B - JULY 2004 - REVISED DECEMBER 2004 gain settings. Data is formatted as MSB first, straight binary code. SCLK is the serial clock input. Data is clocked into SDI on the rising edge of SCLK. SERIAL CONTROL PORT The serial control port is utilized to program the gain settings for the PGA2320. The serial control port includes three input pins and one output pin. The inputs include CS (pin 2), SDI (pin 3), and SCLK (pin 6). The sole output pin is SDO (pin 7). SDO is the serial data output pin, and is used when daisy-chaining multiple PGA2320 devices. Daisy-chain operation is described in detail later in this section. SDO is a tristate output, and assumes a high impedance state when CS is high. The CS pin functions as the chip select input. Data may be written to the PGA2320 only when CS is low. SDI is the serial data input pin. Control data is provided as a 16-bit word at the SDI pin, 8 bits each for the left and right channel The protocol for the serial control port is shown in Figure 2. See Figure 3 for detailed timing specifications of the serial control port. CS SCLK SDI R7 R6 R5 R4 R3 R2 R1 R0 L7 L6 L5 L4 L3 L2 L1 L0 SDO R7 R6 R5 R4 R3 R2 R1 R0 L7 L6 L5 L4 L3 L2 L1 L0 Gain Byte Format is MSB First, Straight Binary R0 is the Least Significant Bit of the Right Channel Gain Byte R7 is the Most Significant Bit of the Right Channel Gain Byte L0 is the Least Significant Bit of the Left Channel Gain Byte L7 is the Most Significant Bit of the Left Channel Gain Byte SDI is latched on the rising edge of SCLK SDO transitions on the falling edge of SCLK Figure 2. Serial Interface Protocol 8 " #$#% www.ti.com SBOS312B - JULY 2004 - REVISED DECEMBER 2004 GAIN SETTINGS For N = 1 to 255: The gain for each channel is set by its corresponding 8-bit code, either R[7:0] or L[7:0]; see Figure 2. The gain code data is straight binary format. If we let N equal the decimal equivalent of R[7:0] or L[7:0], then the following relationships exist for the gain settings: Gain (dB) = 31.5 - [0.5 * (255 - N)] This results in a gain range of +31.5dB (with N = 255) to -95.5dB (with N = 1). Changes in gain setting may be made with or without zero crossing detection. The operation of the zero crossing detector and timeout circuitry is discussed later in this data sheet. For N = 0: Mute Condition. The input multiplexer is connected to analog ground (AGNDR or AGNDL). CS tCSCR t SDS tCFCS SCLK tSDH SDI MSB SDO tCSO tCFDO Figure 3. Serial Interface Timing Requirements 9 " #$#% www.ti.com SBOS312B - JULY 2004 - REVISED DECEMBER 2004 DAISY-CHAINING MULTIPLE PGA2320 DEVICES In order to reduce the number of control signals required to support multiple PGA2320 devices on a printed circuit board, the serial control port supports daisy-chaining of multiple PGA2320 devices. Figure 4 shows the connection requirements for daisy-chain operation. This arrangement allows a three-wire serial interface to control many PGA2320 devices. As shown in Figure 4, the SDO pin from device #1 is connected to the SDI input of device #2, and is repeated for additional devices. This configuration in turn forms a large shift register, in which gain data may be written for all PGA2320s connected to the serial bus. The length of the shift register is 16 x N bits, where N is equal to the number of PGA2320 devices included in the chain. The CS input must remain low for 16 x N SCLK periods, where N is the number of devices connected in the chain, in order to allow enough SCLK cycles to load all devices. ZERO CROSSING DETECTION The PGA2320 includes a zero crossing detection function that can provide for noise-free level transitions. The concept is to change gain settings on a zero crossing of the input signal, thus minimizing audible glitches. This function is enabled or disabled using the ZCEN input (pin 1). When ZCEN is low, zero crossing detection is disabled. When ZCEN is high, zero crossing detection will be enabled. The zero crossing detection takes effect with a change in gain setting for a corresponding channel. The new gain setting will not be latched until either two zero crossings are detected, or a timeout period of 16ms has elapsed without detecting two zero crossings. In the case of a timeout, the new gain setting takes effect with no attempt to minimize audible artifacts. Controller SCLK SDI CS Audio Input VINL VINR PGA2320 #1 SDO VOUTL VOUTR SDI SCLK 100k CS Audio Input 100k VINL VINR PGA2320 #2 SDO VOUTL VOUTR SDI SCLK CS Audio Input VINL VINR PGA2320 #3 VOUTL SDO VOUTR Figure 4. Daisy-Chaining Multiple PGA2320 Devices 10 " #$#% www.ti.com SBOS312B - JULY 2004 - REVISED DECEMBER 2004 MUTE FUNCTION APPLICATIONS INFORMATION The PGA2320 includes a mute function. This function may be activated by either the MUTE input (pin 8), or by setting the gain byte value for one or both channels to 00HEX. The MUTE pin may be used to mute both channels, while the gain setting may be used to selectively mute the left and right channels. Muting is accomplished by switching the input multiplexer to analog ground (AGNDR or AGNDL) with zero crossing enabled. This section includes additional information that is pertinent to designing the PGA2320 into an end application. RECOMMENDED CONNECTION DIAGRAM Figure 5 depicts the recommended connections for the PGA2320. Power-supply bypass capacitors should be placed as close to the PGA2320 package as physically possible. The MUTE pin is active low. When MUTE is low, each channel will be muted following the next zero crossing event or timeout that occurs on that channel. If MUTE becomes active while CS is also active, the mute will take effect once the CS pin goes high. When the MUTE pin is high, the PGA2320 operates normally, with the mute function disabled. +5V Digital ZCEN CS 1 16 2 15 3 14 VINL SDI VOUTL C3 4 C1 Controller C2 13 - 15V Analog PGA2320 5 SCLK C4 +15V Analog 12 6 11 7 10 8 9 C5 C6 VOUTR SDO MUTE To Additional PGA2320s VINR C2, C3, C5 = 0.1F ceramic or metal film. C1, C4, C6 = 10F tantalum or aluminum electrolytic. DGND AGND Figure 5. Recommended Connection Diagram 11 " #$#% www.ti.com SBOS312B - JULY 2004 - REVISED DECEMBER 2004 PRINTED CIRCUIT BOARD LAYOUT GUIDELINES It is recommended that the ground planes for the digital and analog sections of the printed circuit board (PCB) be separate from one another. The planes should be connected at a single point. Figure 6 shows the recommended PCB floor plan for the PGA2320. Analog Power Digital Power +5V DGND Host The PGA2320 is mounted so that it straddles the split between the digital and analog ground planes. Pins 1 through 8 are oriented to the digital side of the board, while pins 9 through 16 are on the analog side of the board. AGND - 15V +15V Analog Inputs and Outputs PGA2320 DIGITAL GROUND PLANE Digital Ground ANALOG GROUND PLANE Analog Ground Figure 6. Typical PCB Layout Floor Plan 12 PACKAGE OPTION ADDENDUM www.ti.com 26-May-2010 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) PGA2320IDW ACTIVE SOIC DW 16 40 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Request Free Samples PGA2320IDWG4 ACTIVE SOIC DW 16 40 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Request Free Samples PGA2320IDWR ACTIVE SOIC DW 16 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Purchase Samples PGA2320IDWRG4 ACTIVE SOIC DW 16 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Purchase Samples (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. 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Addendum-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device PGA2320IDWR Package Package Pins Type Drawing SOIC DW 16 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2000 330.0 16.4 Pack Materials-Page 1 10.75 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 10.7 2.7 12.0 16.0 Q1 PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) PGA2320IDWR SOIC DW 16 2000 367.0 367.0 38.0 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. 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