Sony Ericsson GM47 - Manual (Page 51)

2. SYSTEM CONNECTOR INTERFACE
51
LZT 123 7263 R1C
2.6.4 Speaker Signals
BEARP and BEARN are the speaker output pins. These are
differential-mode outputs. The electrical characteristics are given in the
table below.
The following table shows the ear piece impedances that can be
connected to BEARP and BEARN.
Pin Speaker signals Dir Function
55 BEARP O Speaker positive output
56 BEARN O Speaker negative output
Parameter Limit
Output level (differential) ≥4.0V
pp
Output level (dynamic load = 32 Ω ) ≥2.8V
pp
Gain PCMIN a to BEARP/BEARN (differential)
a. See PCMIN signal in “2.7 PCM Digital Audio”, page 52
–9dB ± 1
Distortion at 1kHz and maximum output level ≤5%
Offset, BEARP to BEARN ±30mV
Ear-piece mute-switch attenuation ≥40dB
Ear piece model Impedance Tolerance
Dynamic ear piece [32 Ω + 800µH] // 100pF ±20%
Dynamic ear piece [150 Ω + 800µH] // 100pF ±20%
Piezo ear piece 1k Ω + 60nF ±20%