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| OPA369 Datasheet, PDF (11/20 Pages) Burr-Brown (TI) – 1.8V, 1μA max, Zerø-Crossover RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER | |||
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WINDOW COMPARATOR
Figure 27 shows the OPA2369 used as a window
comparator. The threshold limits are set by VH and
VL, with VH > VL. When VIN < VH, the output of A1 is
low. When VIN >VL, the output of A2 is low.
Therefore, both op amp outputs are at 0V as long as
VIN is between VH and VL. This configuration results
in no current flowing through either diode, Q1 in
cutoff, with the base voltage at 0V, and VOUT forced
high.
OPA369
OPA2369
SBOS414A â AUGUST 2007 â REVISED SEPTEMBER 2007
If VIN falls below VL, the output of A2 is high, current
flows through D2, and VOUT is low. Likewise, if VIN
rises above VH, the output of A1 is high, current flows
through D1, and VOUT is low. The window comparator
threshold voltages are set as follows:
VH
=
R2
R1 + R2
(5)
VL =
R4
R3 + R4
(6)
3V
R1
R2
3V
VH
A1
1/2
OPA2369
D1(2)
RIN(1)
2kW
VIN
R5
10kW
3V
R3
3V
A2
1/2
VL OPA2369
D2(2)
3V
R7
5.1kW
VOUT
Q1(3)
R6
5.1kW
R4
NOTES: (1) RIN protects A1 and A2 from possible excess current flow.
(2) IN4446 or equivalent diodes.
(3) 2N2222 or equivalent NPN transistor.
Figure 27. OPA2369 as a Window Comparator
ADDITIONAL APPLICATION EXAMPLES
Figure 28 through Figure 32 illustrate additional application examples.
VEX
RR
RR
R1
+5V
OPA369
VOUT
R1
VREF
Figure 28. Single Op Amp Bridge Amplifier
Copyright © 2007, Texas Instruments Incorporated
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Product Folder Link(s): OPA369 OPA2369
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