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參數(shù)資料
| 型號： | PCM3501E |
| 元件分類： | Codec |
| 英文描述： | Low Voltage, Low Power, 16-Bit, Mono VOICE/MODEM CODEC |
| 中文描述： | 低電壓，低功耗，16位，單聲道語音/調(diào)制解調(diào)器編解碼器 |
| 文件頁數(shù)： | 24/24頁 |
| 文件大小： | 182K |
| 代理商： | PCM3501E |
24
PCM3501
FIGURE 25. 5-Level Delta-Sigma Modulator Block Digram.
Out
64f
S
In
8f
18-Bit
+
+
+
4
3
2
1
0
5-level Quantizer
+
–
+
Z
–1
+
–
+
Z
–1
+
+
Z
–1
shaper consists of five integrators which use a switched-
capacitor topology, a comparator, and a feedback loop con-
sisting of a one-bit DAC. The delta-sigma modulator shapes
the quantization noise, shifting it out of the audio band in the
frequency domain. The high order of the modulator enables
it to randomize the modulator outputs, reducing idle tone
levels.
The 64f
S
one-bit data stream from the modulator is con-
verted to 1f
S
, 16-bit data words by the decimation filter,
which also acts as a low-pass filter to remove the shaped
quantization noise. The DC components can be removed by
a high-pass filter function contained within the decimation
filter.
DAC SECTION
The delta-sigma DAC section of PCM3501 is based on a 5-
level amplitude quantizer and a 3rd-order noise shaper. This
section converts the oversampled input data to 5-level delta-
sigma format. A block diagram of the 5-level delta-sigma
modulator is shown in Figure 25. This 5-level delta-sigma
modulator has the advantage of stability and clock jitter
sensitivity over the typical one-bit (2 level) delta-sigma
modulator. The combined oversampling rate of the delta-
sigma modulator and the internal 8x interpolation filter is
64f
S
for a 512f
S
system clock.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCM3501E/2K | 功能描述:接口—CODEC Lo-Vlt Lo-Pwr Mono Voice/Modem Codec RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| PCM3501E/2KG4 | 功能描述:接口—CODEC Lo-Vlt Lo-Pwr Mono Voice/Modem Codec RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| PCM3501EG4 | 功能描述:接口—CODEC Lo-Vlt Lo-Pwr Mono Voice/Modem Codec RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| PCM-350-374 | 功能描述:電線鑒定 Pre-Printed WM Card, Vinyl Cloth, .22" W RoHS:否 制造商:TE Connectivity / Q-Cees 產(chǎn)品:Labels and Signs 類型: 材料:Vinyl 顏色:Blue 寬度:0.625 in 長度:1 in |
| PCM-351 | 制造商:Panduit Corp 功能描述: |
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