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參數(shù)資料
| 型號： | TEA7063 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SPEECH CIRCUIT WITH POWER MANAGEMENT |
| 中文描述： | 語音電路電源管理 |
| 文件頁數(shù)： | 6/15頁 |
| 文件大小： | 228K |
| 代理商： | TEA7063 |
2. TRANSMISSION CHAIN
2.1 A.G.C. In Transmission
The transmission gain between Microphone Input
(pin 7) and Vline (pin 16) is internally decreased
of 6dB when the line current varies from ILL to
ILS with a constantAC load of 600
.
The values of ILL (long line current) and ILS (short
line current) are programmable through I-start (pin
9) andI-slope(pin 15) (seealsoparagr.4).
2.2 Sending Impedance
The impedanceof the OutputStage Amplifier, Z
out
,
is determinedby theimpedanceZ4 (at pin 3).
Z
out
= 10.65 xZ4
The total AC impedance shown to the line is the
parallel
Z
par
= Z
out
//Z
int
//Z
ext
where:
- Z
int
= 10K
//8.5 nF (internal)
- Z
ext
= R6//C4 (at pin16)
2.3 Sending Mute
In normal speech operation (V
mute
at pin 14 <
0.8V), the signal at Microphone Input (pin 7) is
amplified to V
line
(pin 16) with the gain Gs (long
line) or 6dB lower (shorter lines) depending on
AGC control (seeparagr. 4).
In sending mute condition (V 14 > 1.6V) these
gains are reduced of at least 60dB. In the same
condition, DTMF input (pin 6) is activated, with
gain Gmf to the lineindependentfrom I
line
lenght.
2.4 Antisidetone Buffer
The signal coming from the sending preamplifier
is internally presented at pin 4 and than buffered
to pins 1 and 2 for sidetone cancellation (see
paragraph3.2).
Figure3
TEA7063
6/15
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| TEA7063FP | SPEECH CIRCUIT WITH POWER MANAGEMENT |
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| TEA7063DP | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SPEECH CIRCUIT WITH POWER MANAGEMENT |
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| TEA7088A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-RANGE PHONE DEDICATED CHIP |
| TEA7088AFP | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-RANGE PHONE DEDICATED CHIP |
| TEA7089 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-RANGE PHONE DEDICATED CHIP |
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