tea1097h NXP Semiconductors, tea1097h Datasheet - Page 13

• Manufacturer Part Number: tea1097h
• Description: Speech And Loudspeaker Amplifier Ic With Auxiliary Inputs/outputs And Analog Multiplexer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Base microphone channel (pins TXIN, GATX, TXOUT
and GNDTX) see Fig.7
The TEA1097 has an asymmetrical base microphone
input TXIN with an input resistance of 20 k .
The DC biasing of the input is 0 V.
The output TXOUT is biased at two diodes voltage and has
a current capability equal to 20 A (RMS). The gain of the
microphone amplifier (from pins TXIN to TXOUT) can be
adjusted from 0 to 31 dB to suit specific application
requirements.
1999 Apr 08
handbook, full pagewidth
Speech and loudspeaker amplifier IC with
auxiliary inputs/outputs and analog multiplexer
The pin numbers given in parenthesis refer to the TEA1097H.
V BB
R MIC
C MIC
(28)
30
TXIN
Fig.7 Base microphone channel.
V
I
13
The gain is proportional to the value of R
14.85 dB with R
output, the microphone input stage can accommodate
signals up to 18 mV (RMS) at room temperature for 2% of
THD.
A capacitor can be connected in parallel with R
provide a 1st-order low-pass filter.
I
V
GNDTX
TXOUT
GATX
MGL395
GATX
(27)
(26)
(29)
29
28
31
= 30.1 k . Without limitation from the
R GATX
C GATX
Product specification
GATX
TEA1097
and equals
GATX
to