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| OPA454 Datasheet, PDF (28/36 Pages) Texas Instruments – High-Voltage (100V), High-Current (50mA) OPERATIONAL AMPLIFIERS, G = 1 Stable | |||
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OPA454
SBOS391 â DECEMBER 2007
R1
25kW
V1
R2
25kW
OPA454
R3
25kW
V2
R4
25kW
VOUT = V2 - V1
Figure 82. High-Voltage Difference Amplifier
HIGH-COMPLIANCE VOLTAGE CURRENT
SOURCES
This section describes four different applications
utilizing high compliance voltage current sources with
differential inputs. Figure 69 and Figure 83 illustrate
the different applications.
25kW
V1
25kW
www.ti.com
A red light emitting diode (LED) was used to generate
Figure 84.
Gain of the avalanche photodiode (APD) is adjusted
by changing the voltage across the APD. Gain starts
to increase when reverse voltage is increased beyond
130V for this API diode. Figure 85 shows this
structure.
6V
14
12
VOUT
10
8
6
4
VLED
0V
2
0
-2V
-2
5ms/div
Figure 84. Avalanche Photodiode Circuit
25kW
V2
OPA454
A1
25kW
R
OPA454
A2
Load IO
IO = (V2 - V1)/R
Figure 83. Differential Input Voltage-to-Current
Converter for Low IOUT
28
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Copyright © 2007, Texas Instruments Incorporated
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