Sony Ericsson GM48, GM47 manual Table below shows the audio signal levels for Afms

GM47/GM48 INTEGRATOR’S MANUAL

The table below shows the audio signal levels for AFMS.

Parameter		Limit
Speaker impedance		64Ω to 1kΩ
Output Capacitance		2.2µF ±10%
	Drive capability into 5kΩ	>2.4Vp-p
	(0.3 - 3.5kHz)
Levels (THD <5%)	Drive capability into 1.5kΩ	>2.2Vp-p
	(0.3 - 3.5kHz)
	Drive capability into 150 Ω	>1.3Vp-p
	(at 1kHz)

2.6.3 Microphone Signals

Pin	Speaker signals	Dir	Function
53	MICP	I	Microphone positive input
54	MICN	I	Microphone negative input

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.

2 - 2.5V

@1mA

CODEC

GM47

1k

68nF

68nF

1k

MICP

MICN

AGND

Figure 2.3 Microphone connections to the module

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LZT 123 7263 R1C