Datasheet

V =V - V
OUT 2 1
V
1
V
2
R
25kW
3
R
25kW
4
R
25kW
2
R
25kW
1
OPA454
HIGH-COMPLIANCE VOLTAGE CURRENT
5ms/div
14
12
10
8
6
4
2
0
-2
V
(1V/div)
O
UT
V (V)
LED
0V
-2V
6V
V
OUT
V
LED
OPA454
V
1
V
2
Load
I
O
I =(V -
O 2 1
V )/R
R
OPA454
25kW 25kW
25kW 25kW
A
1
A
2
OPA454
SBOS391A – DECEMBER 2007 – REVISED DECEMBER 2008 ....................................................................................................................................... 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 APD diode. Figure 85 shows this
structure.
Figure 82. High-Voltage Difference Amplifier
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.
Figure 84. Avalanche Photodiode Circuit
Figure 83. Differential Input Voltage-to-Current
Converter for Low I
OUT
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