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PGA2310UA Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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PGA2310UA Datasheet(HTML) 10 Page - Burr-Brown (TI) |
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10 / 16 page  PGA2310 SBOS207B − OCTOBER 2001 − REVISED JUNE 2004 www.ti.com 10 DAISY-CHAINING MULTIPLE PGA2310 DEVICES In order to reduce the number of control signals required to support multiple PGA2310 devices on a printed circuit board, the serial control port supports daisy-chaining of multiple PGA2310 devices. Figure 4 shows the connection requirements for daisy-chain operation. This arrangement allows a three-wire serial interface to control many PGA2310 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 in turn forms a large shift register, in which gain data may be written for all PGA2310s connected to the serial bus. The length of the shift register is 16 x N bits, where N is equal to the number of PGA2310 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 PGA2310 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. SDI V INL V INR SDO SCLK CS V OUTL V OUTR PGA2310 #1 SDI V INL V INR SDO SCLK CS V OUTL V OUTR PGA2310 #2 SDI V INL V INR SDO SCLK CS V OUTL V OUTR PGA2310 #3 Audio Input Audio Input Audio Input 100k Ω 100k Ω Controller Figure 4. Daisy-Chaining Multiple PGA2310 Devices |
Similar Part No. - PGA2310UA |
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Similar Description - PGA2310UA |
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