TEA1095T NXP Semiconductors, TEA1095T Datasheet - Page 7

• Manufacturer Part Number: TEA1095T
• Manufacturer: NXP Semiconductors

Specifications of TEA1095T

• Operating Temp Range: -25C to 75C
• Package Type: SO
• Pin Count: 24
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
Supply: pins V
The TEA1095 must be supplied with an external stabilized
voltage source between pins V
without any signal, the internal supply current is 2.7 mA at
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
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
1997 Nov 25
handbook, full pagewidth
BB
Voice switched speakerphone IC
= 5 V.
BB
, GND and PD
V BB
R MIC
C TXIN
BB
BB
and GND. In idle mode,
is 140 A.
MUTETX
TXIN
envelope
detector
to
V
switch
voice
from
Fig.4 Transmit channel.
I
logic
to
7
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 R
15.5 dB with R
A capacitor must be connected in parallel with R
ensure stability of the transmit amplifier. Together with
R
By applying a HIGH level on pin MUTETX, the transmit
amplifier is muted and the TEA1095 is automatically
forced into the receive mode.
GATX
I
, it also provides a first-order low-pass filter.
V
TXGND
TXOUT
GATX
GATX
= 30.1 k .
R GATX
C GATX
MBG357
Product specification
to transmission
circuit
GATX
TEA1095
and equals
GATX
to