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參數(shù)資料
| 型號： | TP13067AN |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | Codec |
| 英文描述： | MONOLITHIC SERIAL INTERFACE COMBINED PCM CODEC AND FILTER |
| 中文描述： | 整體式串行接口的PCM編解碼器和過濾器 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 283K |
| 代理商： | TP13067AN |
TP3064A, TP3067A, TP13064A, TP13067A
MONOLITHIC SERIAL INTERFACE
COMBINED PCMCODEC AND FILTER
SCTS025C – SEPTEMBER 1992 –REVISED JULY 1996
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
transmit section
The transmit section input is an operational amplifier with provision for gain adjustment using two external
resistors. The low noise and wide bandwidth characteristics of these devices provide gains in excess of 20 dB
across the audio passband. The operational amplifier drives a unity-gain filter consisting of an RC active prefilter
followed by an eight-order switched-capacitor band-pass filter clocked at 256 kHz. The output of this filter
directly drives the encoder sample-and-hold circuit. As per
μ
-law (TP3064A and TP13064A) or A-law (TP3067A
and TP13067A) coding conventions, the ADC is a companding type. A precision voltage reference provides an
input overload of nominally 2.5-V peak. The sampling of the filter output is controlled by the FSX frame sync
pulse. Then the successive-approximation encoding cycle begins. The 8-bit code is loaded into a buffer and
shifted out through DX at the next FSX pulse. The total encoding delay is approximately 290
μ
s. Any offset
voltage due to the filters or comparator is cancelled by sign bit integration (see Table 2).
Table 2. Encoding Format at DX Output
TP3064A, TP13064A
μ
-Law
TP3067A, TP13067A
A-Law
(INCLUDES EVEN-BIT INVERSION)
VI = + Full scale
1 0 0 0 0 0 0 0
1 0 1 0 1 0 1 0
VI = 0
1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1
1 1 0 1 0 1 0 1
0 1 0 1 0 1 0 1
VI = – Full scale
0 0 0 0 0 0 0 0
0 0 1 0 1 0 1 0
receive section
The receive section consists of an expanding DAC that drives a fifth-order low-pass filter clocked at 256 kHz.
The decoder is
μ
-law (TP3064A and TP13064A) or A-law (TP3067A and TP13067A), and the fifth-order
low-pass filter corrects for the (sin x)/x attenuation caused by the 8-kHz sample/hold. The filter is followed by
a second-order RC active post filter with its output at VFRO. The receive section is unity gain, but gain can be
added by using the power amplifiers. At FSR, the data at DR is clocked in on the falling edge of the next eight
BCLKR (BCLKX) periods. At the end of the decoder time slot, the decoding cycle begins and 10-
μ
s later the
decoder DAC output is updated. The decoder delay is about 10
μ
s (decoder update) plus 110
μ
s (filter delay)
plus 62.5
μ
s (1/2 frame), or a total of approximately180
μ
s.
receive power amplifiers
Two inverting-mode power amplifiers are provided for directly driving a match-line interface transformer. The
gain of the first power amplifier can be adjusted to boost the
±
2.5-V peak output signal from the receive filter
up to the
±
3.3-V peak into an unbalanced 300-
load, or
±
4 V into an unbalanced 15-k
load. The second power
amplifier is internally connected in the unity-gain inverting mode to give 6 dB of signal gain for balanced loads.
Maximum power transfer to a 600-
subscriber line termination is obtained by differentially driving a balanced
transformer with
√
2:1 turns ratio, as shown in Figure 3. A total peak power of 15.6 dBm can be delivered to the
load plus termination.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TP3067ADW | MONOLITHIC SERIAL INTERFACE COMBINED PCM CODEC AND FILTER |
| TP13067ADW | MONOLITHIC SERIAL INTERFACE COMBINED PCM CODEC AND FILTER |
| TP3067AN | MONOLITHIC SERIAL INTERFACE COMBINED PCM CODEC AND FILTER |
| TP3064A | MONOLITHIC SERIAL INTERFACE COMBINED PCM CODEC AND FILTER |
| TP3064ADW | MONOLITHIC SERIAL INTERFACE COMBINED PCM CODEC AND FILTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TP13067B | 制造商:TI 制造商全稱:Texas Instruments 功能描述:MONOLITHIC SERIAL INTERFACE COMBINED PCM CODEC AND FILTER |
| TP13067BDW | 功能描述:接口—CODEC PCM 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 |
| TP13067BJ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:A-Law CODEC |
| TP13067BN | 功能描述:接口—CODEC PCM 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 |
| TP130K | 功能描述:鉗型萬用表及配件 AIR/GAS K TYPE PROBE RoHS:否 制造商:Fluke 準(zhǔn)確性:2 % 測距:400 A |
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