參數資料
型號: TEA1095T
廠商: NXP SEMICONDUCTORS
元件分類: 無繩電話/電話
英文描述: Voice switched speakerphone IC
中文描述: SPEAKER PHONE CIRCUIT, PDSO24
封裝: PLASTIC, SOT-137, SO-24
文件頁數: 7/28頁
文件大?。?/td> 184K
代理商: TEA1095T
1997 Nov 25
7
Philips Semiconductors
Product specification
Voice switched speakerphone IC
TEA1095
Supply: pins V
BB
, GND and PD
The TEA1095 must be supplied with an external stabilized
voltage source between pins V
BB
and GND. In idle mode,
without any signal, the internal supply current is 2.7 mA at
V
BB
= 5 V.
To reduce current consumption during pulse dialling or
register recall (flash), the TEA1095 is provided with a
power-down (PD) input. When the voltage on PD is HIGH,
the current consumption from V
BB
is 140
μ
A.
Transmit channel: pins TXIN, GATX, TXOUT, TXGND
and MUTETX
The TEA1095 has an asymmetrical transmit input (TXIN)
with an input resistance of 20 k
. The gain of the input
stage varies according to the mode of the TEA1095. In the
transmit mode, the gain is at its maximum; in the receive
mode, it is at its minimum and in the idle mode, it is halfway
between maximum and minimum. Switch-over from one
mode to the other is smooth and click-free. The output
capability at pin TXOUT is 20
μ
A (RMS).
In the transmit mode, the overall gain of the transmit
amplifier (from pin TXIN to TXOUT) can be adjusted from
0 dB to 40 dB to suit application specific requirements.
The gain is proportional to the value of R
GATX
and equals
15.5 dB with R
GATX
= 30.1 k
.
A capacitor must be connected in parallel with R
GATX
to
ensure stability of the transmit amplifier. Together with
R
GATX
, it also provides a first-order low-pass filter.
By applying a HIGH level on pin MUTETX, the transmit
amplifier is muted and the TEA1095 is automatically
forced into the receive mode.
Fig.4 Transmit channel.
handbook, full pagewidth
MBG357
V
I
I
V
CTXIN
VBB
RMIC
MUTETX
TXIN
from
voice
switch
to
envelope
detector
TXGND
TXOUT
GATX
to transmission
circuit
RGATX
CGATX
to
logic
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