Integrator's Manual GR47/GR48

5. SYSTEM CONNECTOR INTERFACE

LZT 123 7589 R1A

5.7.4 Speaker Signals

BEARP and BEARN are the speaker output pins. These are

differential-mode outputs. The electrical characteristics are given in the

table below.

(5)

See PCMIN signal in 5.8 PCM Digital Audio, page 33.

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) ≥ 4.0 V

Output level (dynamic load = 32 Ω) ≥ 2.8 V

Gain PCMIN

(5)

to BEARP/BEARN (differential)

– 9 dB ± 1

Distortion at 1 kHz and maximum output level ≤ 5 %

Offset, BEARP to BEARN ± 30 mV

Ear-piece mute-switch attenuation ≥ 40 dB

Ear piece model Impedance Tolerance

Dynamic ear piece [32 Ω + 800 µH] // 100 pF ± 20 %

Dynamic ear piece [150

Ω + 800 µH] // 100 pF ± 20 %

Piezo ear piece 1 kΩ + 60 nF ± 20 %