TEA1095 データシートの表示（PDF） - Philips Electronics

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TEA1095

Voice switched speakerphone IC

Philips Electronics 

Philips Semiconductors

Voice switched speakerphone IC

Product specification

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 = 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 VBB is 140 µA.

Transmit channel: pins TXIN, GATX, TXOUT, TXGND

and MUTETX

The TEA1095 has an asymmetrical transmit input (TXIN)

with an input resistance of 20 kΩ. 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 µA (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 kΩ.

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.

handbook, full pagewidth

VBB

MUTETX

CTXIN TXIN

RMIC

VI

to

envelope

detector

from

voice

switch

to

logic

GATX

IV

TXOUT

RGATX

CGATX

to transmission

circuit

TXGND

MBG357

Fig.4 Transmit channel.

1997 Nov 25

7

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