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参数资料
| 型号： | PGA2320IDWG4 |
| 英文描述： | Stereo Audio Volume Control |
| 中文描述： | 立体声音频音量控制 |
| 文件页数： | 10/15页 |
| 文件大小： | 218K |
| 代理商： | PGA2320IDWG4 |
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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.
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10
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.
SDI
V
IN
L
V
IN
R
SDO
SCLK
CS
V
OUT
L
V
OUT
R
SDI
V
IN
L
V
IN
R
SDO
SCLK
CS
V
OUT
L
V
OUT
R
SDI
V
IN
L
V
IN
R
SDO
SCLK
CS
V
OUT
L
V
OUT
R
Audio
Input
Audio
Input
Audio
Input
100k
100k
Controller
PGA2320
#1
PGA2320
#2
PGA2320
#3
Figure 4. Daisy-Chaining Multiple PGA2320 Devices
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PGA2320IDWR | 功能描述:音频放大器 .+/-15V Stereo Audio Volume Control RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| PGA2320IDWRG4 | 功能描述:音频放大器 .+/-15V Stereo Audio Volume Control RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| PGA2320IN | 制造商:Texas Instruments 功能描述:+/-15V STEREO AUDIO VOLUME CONTROL - Rail/Tube |
| PGA238H008B5-1938R | 制造商:FCI 功能描述: |
| PGA238H012B1-1938R | 制造商:FCI 功能描述: |
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