Differential output configuration

AN4598

10/12

DocID026988 Rev 1

7

Differential output configuration

In case a differential output signal is needed, we recommend the use of the TS472 device,

as illustrated in Figure 5.

Figure 5. Differential output configuration

The TS472 comes with standby mode which is effective on the biasing of the microphone if

the 2-V bias embedded in the chip is used.

The footprint on the PCB is reduced because the TS472 is available in flip-chip and

because this device requires less surrounding passive components than with a standard op

amp.

Finally, if the microphone is far from the op amp, the differential input of the TS472 allows a

better immunity to ground noise.

select pin is connected to the bias pin (or a voltage above 1 Vdc).

Note:

C2 and C4 decoupling capacitors should be placed respectively as close as possible to the

op amp and microphone.