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| 型號(hào)： | 935264471557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELEPHONE SPEECH CKT, PQFP44 |
| 封裝： | PLASTIC, SOT-307, QFP-44 |
| 文件頁數(shù)： | 5/39頁 |
| 文件大?。?/td> | 205K |
| 代理商： | 935264471557 |
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1999 Apr 08
13
Philips Semiconductors
Product specication
Speech and loudspeaker amplier IC with
auxiliary inputs/outputs and analog multiplexer
TEA1097
Base microphone channel (pins TXIN, GATX, TXOUT
and GNDTX) see Fig.7
The TEA1097 has an asymmetrical base microphone
input TXIN with an input resistance of 20 k
.
The DC biasing of the input is 0 V.
The output TXOUT is biased at two diodes voltage and has
a current capability equal to 20
A (RMS). The gain of the
microphone amplifier (from pins TXIN to TXOUT) can be
adjusted from 0 to 31 dB to suit specific application
requirements.
The gain is proportional to the value of RGATX and equals
14.85 dB with RGATX = 30.1 k. Without limitation from the
output, the microphone input stage can accommodate
signals up to 18 mV (RMS) at room temperature for 2% of
THD.
A capacitor can be connected in parallel with RGATX to
provide a 1st-order low-pass filter.
Fig.7 Base microphone channel.
The pin numbers given in parenthesis refer to the TEA1097H.
handbook, full pagewidth
MGL395
V
I
V
CMIC
VBB
RMIC
TXIN
GNDTX
TXOUT
GATX
29
(27)
30
(28)
28
(26)
31
(29)
RGATX
CGATX
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