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參數(shù)資料
| 型號： | TP3070V-X |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 編解碼器 |
| 英文描述： | COMBO II Programmable PCM CODEC/Filter |
| 中文描述： | A/MU-LAW, PROGRAMMABLE CODEC, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 9/26頁 |
| 文件大?。?/td> | 401K |
| 代理商： | TP3070V-X |
Programmable Functions
(Continued)
Three registers must be programmed in COMBO II to fully
configure the Hybrid Balance Filter as follows:
Register 1: select/de-select Hybrid Balance Filter;
invert/non-invert cancellation signal;
select/de-select Hybal2 filter section;
attenuator setting.
Register 2: select/de-select Hybal1 filter;
set Hybal1 to 2nd order or 1st order;
pole and zero frequency selection.
Register 3: program pole frequency in Hybal2 filter;
program zero frequency in Hybal2 filter.
Standard filter design techniques may be used to model the
echo path (see Equation (1)) and design a matching hybrid
balance filter configuration. Alternatively, the frequency re-
sponse of the echo path can be measured and the hybrid
balance filter designed to replicate it.
A Hybrid Balance filter design guide and software optimiza-
tion program are available under license from National Semi-
conductor Corporation; order TP3077SW.
Applications Information
Figure 3 shows a typical application of the TP3071 together
with a typical monolithic SLIC. Four of the IL latches are con-
figured as outputs to control the relay drivers on the SLIC,
while IL4 is an input for the Supervision signal.
POWER SUPPLIES
While the pins of the TP3070 COMBO II devices are well
protected against electrical misuse, it is recommended that
the standard CMOS practice of applying GND to the device
before any other connections are made should always be
followed. In applications where the printed circuit card may
be plugged into a hot socket with power and clocks already
present, extra long pins on the connector should be used for
ground and V
. In addition, a Schottky diode should be con-
nected between V
BB
and ground.
To minimize noise sources, all ground connections to each
device should meet at a common point as close as possible
to the device GND pin in order to prevent the interaction of
ground return currents flowing through a common bus im-
pedance. Power supply decoupling capacitors of 0.1 μF
should be connected from this common device ground point
to V
CC
and V
as close to the device pins as possible. V
and V
should also be decoupled with Low Effective Series
Resistance Capacitors of at least 10 μF located near the
card edge connector.
Further guidelines on PCB layout techniques are provided in
Application NoteAN-614, “ COMBO II
Programmable PCM
CODEC/Filter Family Application Guide”.
DS008635-5
FIGURE 2. Simplified Diagram of Hybrid Balance Circuit
www.national.com
9
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TP3070V-XG | 功能描述:接口—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 |
| TP3070V-XG/63 | 功能描述:接口—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 |
| TP3070V-XG/63SN | 功能描述:接口—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 |
| TP3070V-XG/NOPB | 功能描述:接口—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 |
| TP3070-X | 制造商:NSC 制造商全稱:National Semiconductor 功能描述: |
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