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參數資料
| 型號： | PCM3501 |
| 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/調制解調器編解碼器 |
| 文件頁數： | 22/24頁 |
| 文件大?。?/td> | 182K |
| 代理商： | PCM3501 |
22
PCM3501
OUTPUT FILTER CIRCUITS FOR THE DAC
The PCM3501’s DAC uses delta-sigma conversion tech-
niques. It uses oversampling and noise shaping to improve
in-band (f = f
S
/2) signal-to-noise performance at the expense
of increased out-of-band noise. The DAC output must be
low-pass filtered to attenuate the out-of-band noise to a
reasonable level.
The PCM3501 includes a low-pass filter in the on-chip
output amplifier circuit. The frequency response for this
filter is shown in Figure 20. Although this filter helps to
lower the out-of-band noise, it is not adequate for many
applications. This is especially true for applications where
the sampling frequency is below 16kHz, since the out-of-
band noise above f
S
/2 is in the audio spectrum. An external
filter circuit, either passive or active, is required to provide
additional attenuation of the out-of-band noise. The low-
pass filter order will be dependent upon the out-of-band
noise requirements for a particular system. Generally, a 2nd-
order or better low-pass circuit will be required, with the
cut-off frequency set to f
S
/2 or less.
Burr-Brown Application Bulletin AB-034 provides infor-
mation for designing both Multiple Feedback and Sallen-
Key active filter circuits using software available from Burr-
Brown’s web site. Another excellent reference for both
passive and active filter design is the
“Electronic Filter
Design Handbook, Third Edition”
by Williams and Taylor,
published by McGraw-Hill.
ON-CHIP ANALOG FRONT END FOR THE ADC
The PCM3501 A/D converter includes a fully differential
input delta-sigma modulator. In order to simplify external
circuitry, an analog front end (AFE) circuit has been in-
cluded on the PCM3501 just prior to the modulator. The
AFE circuit is shown in Figure 21.
FIGURE 20. DAC Output Amplifier Filter Response.
FIGURE 21. On-Chip AFE Circuit for the ADC.
OUTPUT FILTER
STOPBAND FREQUENCY RESPONSE
Frequency (Hz)
A
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
100
1k
10k
100k
1M
10M
OUTPUT FILTER
PASSBAND FREQUENCY RESPONSE
Frequency (Hz)
A
0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
–0.9
–1.0
100
10
1
1k
10k
100k
50k
V
IN+
4
1
2
3
V
COM
V
REF
1
V
REF
2
Delta-Sigma
Modulator
(+)
(–)
Reference
+
+
0.1
μ
F
+
+
V
IN–
+
0.1
μ
F
5
1
μ
F
1
μ
F
50k
1
μ
F
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相關代理商/技術參數 |
參數描述 |
|---|---|
| PCM3501E | 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: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量: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 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| 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: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量: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: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量: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: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量: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 產品:Labels and Signs 類型: 材料:Vinyl 顏色:Blue 寬度:0.625 in 長度:1 in |
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