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參數(shù)資料
| 型號(hào)： | PGA2320IDWG4 |
| 英文描述： | Stereo Audio Volume Control |
| 中文描述： | 立體聲音頻音量控制 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 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.
www.ti.com
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PGA2320IDWR | 功能描述:音頻放大器 .+/-15V Stereo Audio Volume Control RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| PGA2320IDWRG4 | 功能描述:音頻放大器 .+/-15V Stereo Audio Volume Control RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝: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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