TS472_06 Datasheet, PDF (10/24 Pages) STMicroelectronics – Very low noise microphone preamplifier with 2.0V bias output and active low standby mode

Electrical characteristics
TS472
Figure 8. Bias output voltage vs. bias output Figure 9. Bias output voltage vs. power
current
supply voltage
2.2
Vcc=2.5-6V
2.0
1.8
Tamb=85°C
1.6
1.4
0
Tamb=-40°C
Tamb=25°C
1
2
3
Bias Output Current (mA)
2.2
Tamb=25°C
2.0
1.8
1.6
Ibias=0mA
Ibias=2mA
Ibias=4mA
1.4
4
2.2
3
4
5
5.5
Power Supply Voltage (V)
Figure 10. Bias PSRR vs. frequency
0
Vripple=200mVpp
Vcc=3V
-20 Cb=1μF
Tamb =25°C
-40
Bias floating or 1kΩ to GND
-60
Figure 11. Bias PSRR vs. frequency
0
Vripple=200mVpp
Vcc=5V
-20 _Cb=1μF
Tamb=25°C
-40
Bias = 1kΩ to GND
-60
-80
-100
50 100
1000
Frequency (Hz)
10000 20k
-80
-100
50 100
Bias floating
1000
Frequency (Hz)
10000 20k
Figure 12. Differential output PSRR vs.
frequency
Figure 13. Differential output PSRR vs.
frequency
0
Vripple=200mVpp
-10 Inputs grounded
Vcc=3V
-20 Cb=1μF
Cin=100nF
-30 _Tamb=25°C
-40
GS=bias
-50
GS grounded
GS floating
-60
-70
-80
50 100
1000
Frequency (Hz)
10000 20k
0
Vripple=200mVpp
-10 Inputs grounded
Vcc=5V
-20 Cb=1μF
Cin=100nF
-30 _Tamb=25°C
-40
GS grounded
GS=bias
-50
GS floating
-60
-70
-80
50 100
1000
Frequency (Hz)
10000 20k
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