User Guide

NPL-1
3 - Audio System PAMS Technical Documentation
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7DEOHMicrophone input specifications, external audio
Parameter Symbol Min Typ Max Unit
Microphone amplifier gain for MIC 2 / Handsfree MicG2 0 22,5 dB
Microphone amplifier gain for MIC 2 / Headset MicG2 22.5 42,5 dB
Microphone amplifier input resistor R
MIC
30 50 kOhm
Differential input voltage range for MIC2 input,
G =20 dB
V
IN2
200 m V
PP
Differential input voltage range for MIC2 input,
G =0 dB
V
IN2
2.0 V
PP
Receive Common mode input voltage range for
MIC input
V
INCMR
100 m V
PP
Common mode voltage level V
CM
1.3 1.35 1.4 V
Differential mode voltage range for microphone
amplifier, gain 20 dB
V
OUT
2.0 m V
PP
Differential load resistance for the microphone
input stage
R
GS
30 450 kOhm
Transmit gain absolute accuracy GXA -1.0 0.0 dB
Transmit gain variation with programmed gain,
temperature and supply
GXAGTV -0.7 0.7 dB
Common mode rejection ratio CMRR 45 60 dB