tsh80iylt STMicroelectronics, tsh80iylt Datasheet - Page 18

• Manufacturer Part Number: tsh80iylt
• Description: Wide Band, Rail-to-rail Operational Amplifier With Standby Function
• Manufacturer: STMicroelectronics

Precautions on asymmetrical supply operation
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Precautions on asymmetrical supply operation
The TSH8x can be used either with a dual or a single supply. If a single supply is used, the
inputs are biased to the mid-supply voltage (+V
designed, in order to reject any noise present on the supply rail.
As the bias current is 15µA, you should use a high resistance R1 (approximately 10kΩ) to
avoid introducing an offset mismatch at the amplifier inputs.
Figure 33. Asymmetrical supply schematic diagram
C1, C2, C3 are bypass capacitors intended to filter perturbation from V
capacitor values are appropriate:
R2 and R3 are such that the current through them must be superior to 100 times the bias
current. Therefore, you could use the following resistance values:
C
C
obtained is lower than 10Hz.
Figure 34. Use of the TSH8x in gain = -1 configuration
in
out
and C
). With R1=10kΩ, R
C1=100nF and C2=C3=100µF
R2=R3=4.7kΩ
out
are chosen to filter the DC signal by the low pass filters (R1, C
out
IN
IN
=R
Cin
R1
Cin
R1
L
=150Ω, and C
R2
R3 C1
R2
R3 C1
Vcc+
Vcc+
1k
C2
C2
C3
C3
in
=2µF, C
CC
Cf
1k
/2). This bias network must be carefully
R4
+
+
-
-
R5
Cf
out
=220µF the cutoff frequency
Cout
Cout
OUT
OUT
RL
RL
TSH80-TSH81-TSH82
CC
. The following
in
) and (R
out
,