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TEA1094AM View Datasheet(PDF) - Philips Electronics

Part Name
Description
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TEA1094AM
Philips
Philips Electronics Philips
TEA1094AM Datasheet PDF : 28 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Philips Semiconductors
Hands free IC
Product specification
TEA1094; TEA1094A
handbook, full pagewidth
telephone
line
sidetone
HYBRID
TEA106x
DUPLEX
CONTROL
TEA1094
TEA1094A
acoustic
coupling
MGE438
Fig.4 Hands-free telephone set principles.
Supply: pins VBB, GND and PD
The TEA1094 and TEA1094A must be supplied with an
external stabilized voltage source between pins VBB and
GND. In the idle mode, without any signal, the internal
supply current is 3.1 mA at VBB = 5 V.
To reduce the current consumption during pulse dialling or
register recall (flash), the TEA1094A is provided with a
power-down (PD) input. When the voltage on PD is HIGH
the current consumption from VBB is 180 µA.
Microphone channel: pins MIC, GAT, MOUT, MICGND
and MUTET (see Fig.5)
The TEA1094 and TEA1094A have an asymmetrical
microphone input MIC with an input resistance of 20 k.
The gain of the input stage varies according to the mode
of the TEA1094 and TEA1094A. 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 MOUT is
20 µA (RMS).
In the transmit mode, the overall gain of the microphone
amplifier (from pins MIC to MOUT) can be adjusted from
0 dB up to 31 dB to suit specific application requirements.
The gain is proportional to the value of RGAT and equals
15.5 dB with RGAT = 30.1 k.
A capacitor must be connected in parallel with RGAT to
ensure stability of the microphone amplifier. Together with
RGAT, it also provides a first-order low-pass filter.
By applying a HIGH level on pin MUTET, the microphone
amplifier is muted and the TEA1094 and TEA1094A are
automatically forced into the receive mode.
1996 Jul 15
7
 

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