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PGA2311 Datasheet(PDF) 11 Page - Texas Instruments |
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PGA2311 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 21 page ![]() 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 Submit Documentation Feedback 11 Product Folder Links: PGA2311 |
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