Sony Ericsson GR47/GR48 - Manual (Page 31)

5. SYSTEM CONNECTOR INTERFACE
31
LZT 123 7589 R1A
5.7.3 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 +2 V relative to ground by the radio device as shown below.
Figure 5.5 Microphone connections to the radio device
Output Capacitance 2.2 µF ±10 %
Levels (THD < 5 %) Drive capability into 5 k Ω
(0.3 - 3.5 kHz)
> 2.4 V
p-p
Drive capability into 1.5 k Ω
(0.3 - 3.5 kHz)
> 2.2 V
p-p
Drive capability into 150 Ω
(at 1 kHz)
> 1.3 V
p-p
Parameter Limit
Pin Speaker signals Dir Function
53 MICP I Microphone positive input
54 MICN I Microphone negative input
MICP
1k
1k
GR47
MICN
68nF
68nF
2 - 2.5V
@ 1mA
CODEC
AGND