User's Manual

GE864- QUAD Har dwar e User Guide

1vv0300872 Rev.1 2010-04-02

1.2.1 Output Lines Characteristics

TIP:

We suggest driving the load differentially from both output drivers, thus the output

swing will double and the need for the output coupling capacitor avoided. However if

particular OEM application needs also a Single Ended circuitry can be implemented,

but the output power will be reduced four times.

The OEM cir cuitry shall be designed to reduce the common mode noise typically

gener ated on the ground plane and to get the maximum power output fr om the

device (low resistance tracks).

WARNING:

The loads are directly connected to the amplifier outputs when in

Differential

configur ation, thr ough a capacitor when in

Single Ended

configur ation. Using Single

Ended configuration, the unused output line must be left open. Not respecting this

constr aint, the output stage will be damaged.

TIP:

Remember that there are slightly different electrical per formances between the two

internal audio amplifiers:

the

Ear _MT

lines

can dir ectly drive a

load

at 12dBFS (* * ) in

Differ ential

configur ation

Ear _HF

lines can directly drive a

load

Differential

Single Ended

configur ations

There is no difference if the amplifiers drive an external amplifier

(* * )

0dBFS

is the normalized overall Analog Gain for each Output channel equal to

3,7V

differential