Application information

TS2007FC

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Application information

4.1

Differential configuration principle

The TS2007 is a monolithic fully-differential input/output class D power amplifier. The

TS2007 includes a common-mode feedback loop that controls the output bias value to

to always have a maximum output voltage swing, and by consequence, maximize the output

power. In addition, as the load is connected differentially compared to a single-ended

topology, the output is four times higher for the same power supply voltage.

A fully-differential amplifier has the following advantages.

●

High PSRR (power supply rejection ratio).

●

High CMRR (common mode noise rejection).

●

Virtually zero pop without additional circuitry, giving a faster start-up time than

conventional single-ended input amplifiers.

●

Easy interfacing with differential output audio DACs.

●

No input coupling capacitors required since there is a common mode feedback loop.

4.2

Gain settings

In the flat region of the frequency-response curve (no input coupling capacitor or internal

feedback loop + load effect), the differential gain can be set to either 6 or 12 dB depending

on the logic level of the GS pin.

Note:

the gain is 6 dB. In standby mode, this internal resistor is disconnected (HiZ input).

4.3

Common mode feedback loop limitations

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

mode feedback loop can fulfill its role only within the defined range.

4.4

Low frequency response

If a low frequency bandwidth limitation is required, it is possible to use input coupling

frequency (see Table 5 to Table 9).

Table 11.

GS pin gains

GS pin

Gain (dB)

Gain (V/V)

16 dB

2

012 dB4