GM47/GM48 INTEGRATOR’S MANUAL
50
LZT 123 7263 R1C
The table below shows the audio signal levels for AFMS.

2.6.3 Microphone Signals

MICP and MICN are balanced differential microphone input pins. These inputs are compatible with an electret microphone. The microphone contains an FET buffer with an open drain output, which is supplied with at least +2V relative to ground by the module as shown below.Figure 2.3 Microphone connections to the module
Parameter Limit
Speaker impedance 64to 1k
Output Capacitance 2.2µF ±10%
Levels (THD <5%)
Drive capability into 5k
(0.3 - 3.5kHz) >2.4Vp-p
Drive capability into 1.5k
(0.3 - 3.5kHz) >2.2Vp-p
Drive capability into 150
(at 1kHz) >1.3Vp-p
Pin Speaker signals Dir Function
53 MICP IMicrophone positive input
54 MICN IMicrophone negative input
MICP
1k
1k
GM47
MICN
68nF
68nF
2 - 2.5V
@ 1mA
CODEC
AGND