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參數(shù)資料
| 型號： | T8531A |
| 元件分類： | Codec |
| 英文描述： | T8531A/8532 Multichannel Programmable Codec Chip Set |
| 中文描述： | T8531A/8532多通道可編程解碼器芯片組 |
| 文件頁數(shù)： | 47/50頁 |
| 文件大?。?/td> | 888K |
| 代理商： | T8531A |
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Agere Systems Inc.
47
Preliminary Data Sheet
September 2001
Codec Chip Set
T8531A/T8532 Multichannel Programmable
Applications
(continued)
Common Voltage Reference
Every channel of the T8532 codec requires a 2.4 V reference (VRTX) for operation. Some SLICs provide this refer-
ence for the codec. An external circuit is required for SLICs without the reference voltage.
Figure 14 shows a circuit that can provide the 2.4 V reference for 16 or more channels. Even with the common ref-
erence voltage, interchannel crosstalk remains insignificant. The circuit employs a single supply op amp as a volt-
age follower. R1 and R2 set up the reference voltage. RL provides a reference bias when all channels are
programmed off and provides a discharge path for the reference filtering. The op amp supplies an ample minimum
of 20 mA. Each channel’s VRTX node only requires a maximum of 340
μ
A and VTX is a high-impedance input.
The R
VREFx
resistors provide the necessary bias for the VTX inputs.
12-3570a (F)
Figure 14. Common 2.4 V Voltage Reference
2.15 k
R2
2.37 k
R1
0.1
μ
F
10
μ
F
5 V
3
2
–
+
5 V
8
4
1
1/2 LM2904
OR
EQUIVALENT
1.91 k
RL
0.1
μ
F
10
μ
F
VRTX15
VRTX1
VRTX0
VTX0
VTX1
VTX15
TO
T8531A/2
R
VREF15
301 k
R
VREF1
301 k
R
VREF0
301 k
+
+
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| T8531 | T8502 and T8503 Dual PCM Codecs with Filters |
| T8532 | T8502 and T8503 Dual PCM Codecs with Filters |
| T8533 | T8533/34 Quad Programmable Line Card Signal Processor |
| T8534 | T8533/34 Quad Programmable Line Card Signal Processor |
| T8535B | T8535B/T8536B Quad Programmable Codec |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T8532 | 制造商:AGERE 制造商全稱:AGERE 功能描述:T8531A/8532 Multichannel Programmable Codec Chip Set |
| T8533 | 制造商:AGERE 制造商全稱:AGERE 功能描述:T8533/34 Quad Programmable Line Card Signal Processor |
| T85331G | 制造商:BITECH 制造商全稱:Bi technologies 功能描述:Thick Film Super Low Profile SIP Resistor Networks |
| T85331J | 制造商:BITECH 制造商全稱:Bi technologies 功能描述:Thick Film Super Low Profile SIP Resistor Networks |
| T8534 | 制造商:AGERE 制造商全稱:AGERE 功能描述:T8533/34 Quad Programmable Line Card Signal Processor |
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