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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)： | 23/26頁 |
| 文件大?。?/td> | 199K |
| 代理商： | PCM3500DATASHEET |
23
PCM3500
ANTI-ALIASING FILTER
STOPBAND CHARACTERISTICS
Frequency (Hz)
A
0
–5
–10
–15
–20
–25
–30
–35
–40
–45
–50
1k
100
10k
100k
1M
10M
ANTI-ALIASING FILTER
PASSBAND CHARACTERISTICS
Frequency (Hz)
A
0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
–0.9
–1.0
1k
100
10
1
10k
100k
The AFE circuit consists of a single-ended-to-differential
converter, with the first stage of the circuit doubling as a
low-pass, anti-alias filter. The frequency response for the
filter is shown in Figure 22. Since the delta-sigma modulator
oversamples the input at 64f
S
, the anti-alias filter require-
ments are relaxed, with only a single-pole filter being re-
quired. If an application requires further band limiting of the
input signal, a simple RC filter at the V
IN
input (pin 4) can
be used, as shown in Figure 23.
SOFTWARE MODEM
APPLICATIONS
The PCM3500 was designed to meet the requirements for
software-based analog modems, supporting up to 56kbps
(1)
.
In a software modem application, the PCM3500 is paired
with a Data Access Arrangement (DAA) and a host CPU to
provide the complete modem function. Figure 24 shows a
simplified block diagram of a software modem using the
PCM3500.
The DAA provides the interface between the CODEC and
two-wire telephone line. The DAA provides numerous
functions, including two-to-four wire conversion, modem-
side to line-side isolation, ring detection, hook switch con-
trol, line current compensation, and overvoltage protection.
The host CPU provides the data pump and supervisory
functions for the software modem application. The host
executes modem software code, which includes the neces-
sary routines for transmit and receive functions, error detec-
tion and correction, echo cancellation, and CODEC/DAA
control and supervision.
NOTE: (1) Data transmission is limited to 53kbps over standard telephone
lines. Actual transmission rates vary depending upon the quality of the
lines and switching equipment for a given connection.
FIGURE 22. Anti-Alias Filter Frequency Response.
FIGURE 23. Optional External Low-Pass Filter for the
ADC.
FIGURE 24. Software Modem Block Diagram.
+
V
IN
PCM3500
Analog
Input
R
C
f
–3dB
=
1
2
π
RC
Host
CPU
Controls (ring detect, off hook, etc.)
Modem
Software
PCM3500
CODEC
Data
Access
Arrangement
(DAA)
Data
Tip
Ring
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相關代理商/技術參數(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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