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| 型號： | PCM1850PJT |
| 英文描述： | 24-BIT, 96-kHz STEREO A/D CONVERTER WITH 6 X 2-CHANNEL MUX AND PGA |
| 中文描述： | 24位，96千赫立體聲A / D轉(zhuǎn)換器6 × 2通道的MUX和PGA |
| 文件頁數(shù)： | 21/30頁 |
| 文件大小： | 370K |
| 代理商： | PCM1850PJT |
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PCM1850
PCM1851
SLES108
MARCH 2004
www.ti.com
21
SYNCHRONIZATION WITH DIGITAL AUDIO SYSTEM
In slave mode, the PCM1850/1851 operates under LRCK, synchronized with system clock SCKI. The PCM1850/1851
does not need a specific phase relationship between LRCK and SCKI, but does require the synchronization of LRCK and
SCKI.
If the relationship between LRCK and SCKI changes more than
±
6 BCKs for 64 BCKs/frame (
±
5 BCKs for 48 BCKs/frame)
during one sample period due to LRCK or SCKI jitter, internal operation of the ADC halts within 1/f
S
and digital output is
forced into the BPZ code until resynchronization between LRCK and SCKI is completed.
In the case of changes less than
±
5 BCKs for 64 BCKs/frame (
±
4BCKs for 48BCK/frame), resynchronization with
simultaneous discontinuity in the digital output does not occur.
Figure 26 illustrates the digital output response for loss of synchronization and resynchronization. During undefined data,
the PCM1850/1851 might generate some noise in the audio signal. Also, the transition of normal to undefined data and
undefined or zero data to normal creates a discontinuity of data in the digital output, which could generate some noise in
the audio signal.
It is recommended to set RST (pin 10) to LOW to get stable analog performance when the sampling rate, interface mode,
or data format is changed.
1/f
S
32/f
S
NORMAL DATA
ZERO DATA
UNDEFINED
DATA
NORMAL DATA
SYNCHRONOUS
ASYNCHRONOUS
SYNCHRONOUS
Resynchronization
Synchronization Lost
DOUT
State of
Synchronization
Figure 26. ADC Digital Output for Loss of Synchronization and Resynchronization
Power-Down Control
RST(pin 10) controls the entire ADC operation. During reset mode, the supply current of the analog section is shut off and
the digital section is initialized. DOUT (pin 3) is also disabled. Halting SCKI, BCK, and LRCK is recommended to minimize
power dissipation.
RST
POWER-DOWN MODE
LOW
Reset and power-down modes
HIGH
Normal operation mode
Overflow Flag Output
The PCM1850/1851 has an output flag (pin 4) that indicates when overflow occurs in the L-channel or R-channel, and this
flag remains HIGH at least during the 8192/f
S
time for a momentary overflow occurrence.
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|---|---|
| PCM1850PJTG4 | 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC 24-Bit Stereo ADC w/6x2 ch MUX & PGA RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風格: 封裝 / 箱體: 封裝: |
| PCM1850PJTR | 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC 24-Bit Stereo ADC w/6x2 ch MUX & PGA RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風格: 封裝 / 箱體: 封裝: |
| PCM1850PJTRG4 | 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC 24-Bit Stereo ADC w/6x2 ch MUX & PGA RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風格: 封裝 / 箱體: 封裝: |
| PCM1851APJT | 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC 24-Bit Audio ADC RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風格: 封裝 / 箱體: 封裝: |
| PCM1851APJTG4 | 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC 24B Stereo Audio ADC RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風格: 封裝 / 箱體: 封裝: |
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