OPA27CZ Datasheet, PDF (12/22 Pages) Texas Instruments – Ultra-Low Noise, Precision OPERATIONAL AMPLIFIERS

–In
3
6
OPA37
Gain = 100
Bandwidth ≈ 500kHz
For Gain = 1000, use INA106 differential amplifier.
2
INA105
Differential Amplifier
R_F
5kΩ
25kΩ
25kΩ
2
5
R_G
101Ω
Input Stage Gain = 1 + 2R_F /R_G
R_F
5kΩ
2
6
OPA37
3
+In
3 ^25kΩ
25kΩ
1
6
Output
FIGURE 12. Low Noise Instrumentation Amplifier.
1kΩ
200Ω
500pF
2
6
3 ^OPA37
1MΩ
0.1µF
Output
2kΩ
EDO 6166
Transducer
Frequency Response
≈ 1kHz to 50kHz
FIGURE 13. Hydrophone Preamplifier.
0.1µF
100Ω
100kΩ
2
6
OPA27
3
Output
Dexter 1M
Thermopile
Detector
NOTE: Use metal film resistors
and plastic film capacitor. Circuit
must be well shielded to achieve
low noise.
Responsivity ≈ 2.5 x 10⁴V/W
Output Noise ≈ 30µVrms, 0.1Hz to 10Hz
FIGURE 14. Long-Wavelength Infrared Detector Amplifier.
20pF
TTL INPUT GAIN
“1”
+1
“0”
–1
9.76kΩ
500Ω
Input
10kΩ
2
D1
D2
6
4.99kΩ ₃ OPA27 ₈
S1
S2
1
TTL DG188
In
4.75kΩ
1kΩ
Offset
Trim _+VCC
Balance
Trim
Output
4.75kΩ
FIGURE 15. High Performance Synchronous Demodulator.
12
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OPA27, OPA37
SBOS135C