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TSH70CD Datasheet(PDF) 24 Page - STMicroelectronics

Part # TSH70CD
Description  Rail-to-Rail, Wide-Band, Low-Power Operational Amplifiers
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TSH70CD Datasheet(HTML) 24 Page - STMicroelectronics

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Testing Conditions
TSH70,71,72,73,74,75
24/33
Cin, as Cout, is chosen to filter the DC signal by the low-pass filters (R1,Cin and Rout, Cout).
By taking R1 = 10K
Ω, RL = 150Ω, and Cin = 2uF, Cout=220uF we provide a cut-off frequency
below 10Hz.
Figure 50. Use of the TSH7x in gain = -1 configuration
Some precautions must be taken, especially for low-power supply applications.
A feedback capacitance, Cf, should be added for better stability. Table 8 summarizes the
impact of the capacitance Cf on the phase margin of the circuit.
Table 8.
Impact capacitance Cf
Parameter
Cf (pF)
VCC =
±1.5V V
CC =
±2.5V
VCC =
±5V
Unit
Phase Margin
0
28
43
56
deg
f-3dB
40
39.3
38.3
MHz
Phase Margin
5.6
30
43
56
deg
f-3dB
40
39.3
38.3
MHz
Phase Margin
22
37
52
67
deg
f-3dB
37
34
32
MHz
Phase Margin
33
48
65
78
deg
f-3dB
33.7
30.7
27.6
MHz
IN
R1
Vcc+
OUT
R2
R3
C1
C3
C2
Cin
Cout
+
-
1k
Cf
1k
RL



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