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參數(shù)資料
| 型號： | PCM3500DATASHEET |
| 英文描述： | PCM3500 Data Sheet - Low Voltage. Low Power. 16-Bit. Mono SoundPlus VOICE |
| 中文描述： | PCM3500數(shù)據(jù)表-低電壓。低功耗。 16位。單SoundPlus語音 |
| 文件頁數(shù)： | 22/26頁 |
| 文件大?。?/td> | 199K |
| 代理商： | PCM3500DATASHEET |
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22
PCM3500
OUTPUT FILTER CIRCUITS FOR THE DAC
The PCM3500’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 PCM3500 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 PCM3500 A/D converter includes a fully differential
input delta-sigma modulator. In order to simplify connection
for single-ended applications, an analog front end (AFE)
circuit has been included on the PCM3500 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.
50k
V
IN
4
1
2
3
V
COM
V
REF
1
V
REF
2
Delta-Sigma
Modulator
(+)
(–)
Reference
+
+
1.0
μ
F
+
+
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
–1
–2
–3
–4
–5
–6
–7
–8
–9
–10
100
10
1
1k
10k
100k
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCM3500E | 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 |
| PCM3500E/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 |
| PCM3500E/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 |
| PCM3500EG4 | 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 |
| PCM3501 | 制造商:BB 制造商全稱:BB 功能描述:Low Voltage, Low Power, 16-Bit, Mono VOICE/MODEM CODEC |
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