OPA404KUG4 Datasheet, PDF (10/16 Pages) Texas Instruments – Quad High-Speed Precision Difet ® OPERATIONAL AMPLIFIER

1
Differential
Input
3
E₁
6
2
E₁
5
INA105
FIGURE 7. Voltage-Controlled Microamp Current Source.
2
1
1/4
OPA404
3
Output = 1µA/V
1MΩ
I_O
R
Load
I_O = (E₁ – E₂) /R
Pin Photodiode
UDT Pin-040A
<1pF to prevent gain peaking
1000MΩ
Guard _+15V 0.01µF
0.01µF
FIGURE 8. Sensitive Photodiode Amplifier.
2
8
1/4
3 ^OPA404
1
4 _0.1µF
1000MΩ
–15V
Output
5 x 8⁸ V/W
Circuit must be well shielded.
+
Input
–
Guard
3
1/4
2 ^OPA404 1
10
8
1/4
OPA404 ₉
Guard
A_V = 101µV/V
I_B ≈ 1pA
R_IN ≈ 10¹³â„¦
BW ≈ 100kHz
Differential Voltage Gain = 1+ (2R_F/R_G)
6
1/4
5 ^{OPA404 7}
FIGURE 9. FET Instrumentation Amplifier with Shield Driver.
®
OPA404
10
20kΩ
R_F
10kΩ
R_G /2
100Ω
R_G /2
100Ω
R_F
10kΩ
20kΩ
20kΩ
12
1/4
13 ^OPA404 14
20kΩ