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參數(shù)資料
| 型號(hào)： | TEA1098UH |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Speech and handsfree IC |
| 中文描述： | TELEPHONE SPEECH CKT, UUC44 |
| 封裝： | DIE-44 |
| 文件頁數(shù)： | 12/40頁 |
| 文件大?。?/td> | 199K |
| 代理商： | TEA1098UH |
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1999 Oct 14
12
Philips Semiconductors
Product specification
Speech and handsfree IC
TEA1098
handbook, full pagewidth
MGM299
DUPLEX
CONTROL
HYBRID
telephone
line
sidetone
acoustic
coupling
Fig.7 Handsfree telephone set principles.
H
ANDSFREE MICROPHONE CHANNEL
:
PINS
TXIN, GATX,
TXOUT
AND
GNDTX (see Fig.8)
TheTEA1098hasanasymmetricalhandsfreemicrophone
input (TXIN) with an input resistance of 20 k
.
The input DCbiasis0 V.Thegainoftheinputstagevaries
according to the TEA1098 mode. In Tx mode, it has
maximum gain; in Rx mode, it has minimum gain, and in
Idle mode, it is midway between maximum and minimum
gain.
Switch-over from one mode to the other is smooth and
click-free. The output (TXOUT) is biased at a voltage of
two diodes and has a current capability of 20
μ
A (RMS).
In Tx mode, the overall gain of the microphone amplifier
(from pins TXIN to TXOUT) can be adjusted from
0 up to 31 dB to suit specific application requirements.
The gain is proportional to the value of R
GATX
and equals
15.2 dB when R
GATX
is 30.1 k
. Without output limitation,
the microphone input stage can accept signals of up to
18 mV (RMS) at 2% THD (room temperature).
handbook, full pagewidth
MGL342
V
I
I
V
CMIC
VBB
RMIC
TXIN
from
voice
switch
to
envelope
detector
GNDTX
TXOUT
GATX
31
(28)
30
(27)
29
(26)
32
(29)
RGATX
Fig.8 Handsfree microphone channel.
Pin numbers in parenthesis apply to the TEA1098H. Pin numbers not in parenthesis apply to the TEA1098TV.
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