TS4995

Application information

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Application information

4.1

Differential configuration principle

The TS4995 is a monolithic full-differential input/ output power amplifier with fixed +6 dB

gain. The TS4995 also includes a common mode feedback loop that controls the output bias

output voltage swing, and therefore, to maximize the output power. Moreover, as the load is

connected differentially instead of single-ended, output power is four times higher for the

same power supply voltage.

The advantages of a full-differential amplifier are:

●

●

High common mode noise rejection

●

Virtually no pop and click without additional circuitry, giving a faster start-up time

compared to conventional single-ended input amplifiers

●

Easier interfacing with differential output audio DAC

●

No input coupling capacitors required due to common mode feedback loop

In theory, the filtering of the internal bias by an external bypass capacitor is not necessary.

However, to reach maximum performance in all tolerance situations, it is recommended to

keep this option.

4.2

Common mode feedback loop limitations

As explained previously, the common mode feedback loop allows the output DC bias voltage

feedback loop can fulfil its role only within the defined range.

4.3

Low frequency response

Note:

The input impedance for the TS4995 is typically 20k

value.

)

Hz

(

C

R

2

1

F

in

in

CL

×

×

π

×

=