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PGA2311 Datasheet(PDF) 11 Page - Texas Instruments

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Part # PGA2311
Description  Stereo Audio Volume Control
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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PGA2311
www.ti.com
SBOS218B – DECEMBER 2001 – REVISED JANUARY 2016
Feature Description (continued)
This results in a gain range of +31.5 dB (with N = 255) to
−95.5 dB (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 in Zero Crossing Detection.
7.3.3 Daisy-Chaining Multiple PGA2311 Devices
To reduce the number of control signals required to support multiple PGA2311 devices on a printed-circuit-board,
the serial control port supports daisy-chaining of multiple PGA2311 devices. Figure 12 shows the connection
requirements for daisy-chain operation. This arrangement allows a 3-wire serial interface to control many
PGA2311 devices.
As shown in Figure 12, the SDO pin from PGA2311 #1 is connected to the SDI input of PGA2311 #2, and is
repeated for additional devices. This in turn forms a large shift register, in which gain data may be written for all
PGA2311s connected to the serial bus. The length of the shift register is 16 × N bits, where N is equal to the
number of PGA2311 devices included in the chain. The CS input must remain LOW for 16 × N SCLK periods,
where N is the number of devices connected in the chain, to allow enough SCLK cycles to load all devices.
Figure 12. Daisy-Chaining Multiple PGA2311 Devices
7.3.4 Zero Crossing Detection
The PGA2311 includes a zero crossing detection function 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 is enabled.
The zero crossing detection takes effect with a change in gain setting for a corresponding channel. The new gain
setting is not implemented until either positive slope zero crossing is detected, or a time-out period of 16 ms has
elapsed. In the case of a time-out, the new gain setting takes effect with no attempt to minimize audible artifacts.
Copyright © 2001–2016, Texas Instruments Incorporated
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