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PGA2310UA/1K 参数 Datasheet PDF下载

PGA2310UA/1K图片预览
型号: PGA2310UA/1K
PDF下载: 下载PDF文件 查看货源
内容描述: 立体声音频音量控制 [Stereo Audio Volume Control]
分类和应用:
文件页数/大小: 16 页 / 320 K
品牌: BB [ BURR-BROWN CORPORATION ]
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ꢀ ꢠꢉ ꢡꢢ ꢣ ꢤ  
SBOS207B − OCTOBER 2001 − REVISED JUNE 2004  
www.ti.com  
DAISY-CHAINING MULTIPLE  
PGA2310 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.  
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.  
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  
SDI  
SCLK  
CS  
VIN  
L
Audio  
Input  
PGA2310  
VINR  
#1  
VOUTL  
SDO  
SDI  
VOUTR  
100k  
SCLK  
CS  
VIN  
L
Audio  
Input  
PGA2310  
VINR  
#2  
VOUTL  
SDO  
SDI  
VOUT  
R
100k  
SCLK  
CS  
VIN  
L
Audio  
Input  
PGA2310  
VINR  
#3  
VOUT  
VOUT  
L
SDO  
R
Figure 4. Daisy-Chaining Multiple PGA2310 Devices  
10