Sony Ericsson GR64 5.10 PCM Digital Audio (SSP)

Parameter	Conditions		Min		Typ		Max	Unit
Input voltage full scale	max input gain		14		16		18	mVrms
	min input gain		45		50		56	mVrms
Frequency response	-3dB cut-off		300				3400	Hz
Output dc bias level		2.16		2.4		2.64		V

5.9.4 Speaker Signals (EARP, EARN)

EARP and EARN are the speaker output signals. These are differential-mode outputs. With a full-scale PCM input to the CODEC, 0 dB audio output gain setting, and a differential load RL = 30Ω, the output voltage between EARP and EARN is 1.5 V rms. For load resistances less than 30Ω, the full-scale output needs is limited using the modules internal programmable gain attenuator.

The electrical characteristics are given in the table below.

Parameter	Conditions		Min	Typ		Max	Unit
	RL = 30Ω		1.34	1.5		1.68	Vrms
Input voltage full scale	RL = 16 Ω		1.41				Vrms
	RL = 8Ω		1.24				Vrms
Frequency response	-3dB cut-off	300			3400		Hz

5.10 PCM Digital Audio (SSP)

Pin	Name	Direction	Function
48	SSPDFM	Output	Serial PCM data from module to host
47	SSPDTM	Input	Serial PCM data to module from host
51	SSPFS	In/Out	Serial PCM frame synchronization
52	SSPCLK	In/Out	Serial PCM clock

The SSP (Synchronous Serial Port) digital interface is configured to provide a PCM (digital) audio interface. This interface can be used to process PCM digital audio signals as an alternative to routing signals to the CODECs through the analogue uplink and downlink chains.

5.10.1 PCM Data Format

The PCM digital audio interface for GR64 is based upon the Texas Instruments SSI standard. The SSP is a versatile interface which can be programmed for different clock rates and data frame sizes between 4 to 16 bits.

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