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參數(shù)資料
| 型號： | PGA2311UAG4 |
| 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)： | 10/17頁 |
| 文件大小： | 653K |
| 代理商： | PGA2311UAG4 |
SBOS218A
–
DECEMBER 2001
–
REVISED JUNE 2002
www.ti.com
10
DAISY-CHAINING MULTIPLE PGA2311 DEVICES
In order to reduce the number of control signals re-
quired to support multiple PGA2311 devices on a
printed circuit board, the serial control port supports
daisy-chaining of multiple PGA2311 devices. Figure 4
shows the connection requirements for daisy-chain
operation. This arrangement allows a 3-wire serial in-
terface to control many PGA2311 devices.
As shown in Figure 4, the SDO pin from device #1 is con-
nected to the SDI input of device #2, and is repeated for
additional devices. This in turn forms a large shift regis-
ter, in which gain data may be written for all PGA2311s
connected to the serial bus. The length of the shift regis-
ter 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, in order
to allow enough SCLK cycles to load all devices.
ZERO CROSSING DETECTION
The PGA2311 includes a zero crossing detection func-
tion that can provide for noise-free level transitions.
The concept is to change gain settings on a zero cross-
ing of the input signal, thus minimizing audible glitches.
This function is enabled or disabled using the ZCEN in-
put (pin 1). When ZCEN is LOW, zero crossing detec-
tion 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 implemented until either positive
slope zero crossing is detected or a time-out period of
16ms has elapsed. In the case of a time-out, the new
gain setting takes effect with no attempt to minimize
audible artifacts.
Figure 4. Daisy-Chaining Multiple PGA2311 Devices.
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| PGA2311UG4 | Stereo Audio VOLUME CONTROL |
| PGA2320IDWG4 | Stereo Audio Volume Control |
| PGA2500IDBG4 | Digitally Controlled Microphone Preamplifier |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PGA2311UG4 | 功能描述:音頻放大器 5V 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| PGA2320 | 制造商:BB 制造商全稱:BB 功能描述:Stereo Audio Volume Control |
| PGA2320_06 | 制造商:BB 制造商全稱:BB 功能描述:Stereo Audio Volume Control |
| PGA2320DW | 制造商:Texas Instruments 功能描述:+/-15V STEREO AUDIO VOLUME CONTROL - Rail/Tube |
| PGA2320DWR | 制造商:Texas Instruments 功能描述:+/-15V STEREO AUDIO VOLUME CONTROL - Tape and Reel |
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