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參數資料
| 型號： | PCM1804 |
| 英文描述： | FULL DIFFERENTIAL ANALOG INPUT 24-BIT, 192-kHz STEREO A/D CONVERTER |
| 中文描述： | 全差分模擬輸入24位，192千赫立體聲A / D轉換器 |
| 文件頁數： | 16/31頁 |
| 文件大小： | 470K |
| 代理商： | PCM1804 |
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PCM1804
SLES022A
–
DECEMBER 2001
16
www.ti.com
PRINCIPLES OF OPERATION
theory of operation
The PCM1804 consists of a band-gap reference, a delta-sigma modulator with full differential architecture for
L-channel and R-channel respectively, a decimation filter with a low-cut filter, and a serial interface circuit.
Figure 1 illustrates the total architecture of the PCM1804. An on-chip high-precision reference with 10-
μ
F
external capacitor(s) provides all the reference voltage needed in the PCM1804, and it defines the full-scale
voltage range of both channels. Full differential architecture provides a wide dynamic range and excellent power
supply rejection performance. The input signal is sampled at
×
128,
×
64, and
×
32 oversampling rate for
oversampling ratio. The single rate, dual rate, and quad rate eliminate the external sample-hold amp. Figure 31
illustrates how the PCM1804 for each oversampling ratio decimates the modulator output down to PCM data
when the modulator is running at 6.144 MHz. The delta-sigma modulation randomizes the modulator outputs
and reduces the idle tone level. The oversampled data stream from the delta-sigma modulator is converted to
a 1 f
S
, 24-bit digital signal, while removing high-frequency noise components by a decimation filter. The dc
components of the signal are removed by the HPF, and the HPF output is converted to a time-multiplexed serial
signal through the serial interface, which provides flexible serial formats and master/slave modes. The
PCM1804 also has a DSD output mode. The PCM1804 can output directly the signal from the modulators to
the DSDL (pin 16) and the DSDR (pin 15).
HPF
HPF
Power Supply
CLK
Control
Delta-Sigma
Modulator (L)
VREFL
VREFR
Delta-Sigma
Modulator (R)
Decimation
Filter (L)
Decimation
Filter (R)
Serial
Output
Interface
SCKI
VINL+
VINL
–
VCOML
AGNDL
VREFL
VREFR
AGNDR
VCOMR
VINR+
VINR
–
VCCAGND
DGND
VDD
OSR0
OSR1
OSR2
S/M
FMT0
FMT1
LRCK/DSDBCK
BCK/DSDL
DATA/DSDR
OVFL
OVFR
BYPAS
RST
Figure 30. Total Block Diagram of PCM1804
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| PCM1804DB | FULL DIFFERENTIAL ANALOG INPUT 24-BIT, 192-kHz STEREO A/D CONVERTER |
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| PCM1807PW | Single-Ended, Analog-Input 24-Bit, 96-kHz Stereo A/D Converter |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| PCM1804DB | 功能描述:音頻模/數轉換器 IC Full Diff Anlg Inp 24-Bit 192KHz Ster RoHS:否 制造商:Wolfson Microelectronics 轉換速率: 分辨率: ADC 輸入端數量: 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: |
| PCM1804DB | 制造商:Texas Instruments 功能描述:24BIT DAC SIGMA DELTA SMD 1804 |
| PCM1804DBG4 | 功能描述:音頻模/數轉換器 IC Full Diff Anlg Inp 24-Bit 192KHz Ster RoHS:否 制造商:Wolfson Microelectronics 轉換速率: 分辨率: ADC 輸入端數量: 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: |
| PCM1804DBR | 功能描述:音頻模/數轉換器 IC Full Diff Anlg Inp 24-Bit 192KHz Ster RoHS:否 制造商:Wolfson Microelectronics 轉換速率: 分辨率: ADC 輸入端數量: 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: |
| PCM1804DBRG4 | 功能描述:音頻模/數轉換器 IC Full Diff Anlg Inp 24-Bit 192KHz Ster RoHS:否 制造商:Wolfson Microelectronics 轉換速率: 分辨率: ADC 輸入端數量: 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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