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OPAx349 Datasheet(PDF) 11 Page - Texas Instruments

Part # OPAx349
Description  1.8V, 2.9mA, 90kHz, Rail-to-Rail I/O OPERATIONAL AMPLIFIERS
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

OPAx349 Datasheet(HTML) 11 Page - Texas Instruments

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WINDOW COMPARATOR
V =
H
R
2
R +R
1
2
´ VS
(5)
V =
L
R
4
R +R
3
4
´ VS
(6)
V
S
A1
A2
D1
(2)
D2
(2)
R
5
10kW
R
6
5.1kW
R
7
5.1kW
R
2kW
(1)
IN
V
S
V
S
Q1
(3)
R
1
V
H
V
L
R
2
1/2
OPA2379
1/2
OPA2379
V
S
V
OUT
V
IN
V
S
R
3
R
4
OPA379
OPA2379
OPA4379
www.ti.com ................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008
The window comparator threshold voltages are set as
follows:
Figure 24 shows the OPA2379 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 architecture results in
no current flowing through either diode, Q1 in cutoff,
with the base voltage at 0V, and VOUT forced high.
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.
(1) RIN protects A1 and A2 from possible excess current flow.
(2) IN4446 or equivalent diodes.
(3) 2N2222 or equivalent NPN transistor.
Figure 24. OPA2379 as a Window Comparator
Copyright © 2005–2008, Texas Instruments Incorporated
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11
Product Folder Link(s): OPA379 OPA2379 OPA4379


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