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參數(shù)資料
| 型號： | 935260128112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | SPEAKER PHONE CIRCUIT, PDSO24 |
| 封裝： | PLASTIC, SOT-340, SSOP-24 |
| 文件頁數(shù)： | 29/31頁 |
| 文件大?。?/td> | 259K |
| 代理商： | 935260128112 |
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1997 Nov 25
7
Philips Semiconductors
Product specication
Voice switched speakerphone IC
TEA1095
Supply: pins VBB, GND and PD
The TEA1095 must be supplied with an external stabilized
voltage source between pins VBB and GND. In idle mode,
without any signal, the internal supply current is 2.7 mA at
VBB =5V.
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 VBB is 140 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
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 RGATX and equals
15.5 dB with RGATX = 30.1 k.
A capacitor must be connected in parallel with RGATX to
ensure stability of the transmit amplifier. Together with
RGATX, 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
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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