TS472_06 Datasheet, PDF (18/24 Pages) STMicroelectronics – Very low noise microphone preamplifier with 2.0V bias output and active low standby mode

Application information
TS472
5.7
Standby mode
When the standby command is set, the time required to set the output stages (differential
outputs and 2.0V bias output) in high impedance and the internal circuitry in shutdown mode
is a few microseconds.
5.8
Layout considerations
The TS472 has sensitive pins to connect C1, C2 and Rgs. To obtain high power supply
rejection and low noise performance, it is mandatory that the layout track to these
component is as short as possible.
Decoupling capacitors on V_CC and bypass pin are needed to eliminate power supply drops.
In addition, the capacitor location for the dedicated pin should be as close to the device as
possible.
5.9
Single-ended input configuration
It’s possible to use the TS472 in a single-ended input configuration. The schematic in
Figure 39 provides an example of this configuration.
Figure 39. Single ended input typical application
VCC
Optional
C1
C3
Rpos
1uF
+
Electret Mic
Cin+
Cin-
U1
A1 IN+
B1 IN-
Cs
1uF
Vcc
A2 BIAS
2.0V
C2
TS472
OUT+ C2
OUT- D2
GAIN
G ^{SELECT B2}
Bias ^{BYPASS D1}
Cout+
Cout-
Rout+
Rout-
Positive Output
Negative Output
Cb
1uF
Standby Control
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