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TCA965B Datasheet(PDF) 2 Page - Siemens Semiconductor Group

Part No. TCA965B
Description  Window Discriminator
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Maker  SIEMENS [Siemens Semiconductor Group]
Homepage  http://www.siemens.com/
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 2 page
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TCA 965 B
Semiconductor Group
2
1998-02-10
Functional Description
Amplifier Amp 3 increases the voltage of the reference source
R to V
Stab = 2 x VREF. The
amplification factor can be altered by external wiring. With direct setting of the window,
the input voltage appears on amplifier Amp 1 (
V
8),
the upper edge voltage on
comparator K2 (
V
6) and the lower edge voltage on comparator K1 (V7).
With indirect setting of the window, the input voltage appears on inputs
V
6 and V7, while
the center voltage is connected to amplifier A1 (
V
8).
The voltage applied to the input (
V
9) of amplifier Amp 2 is subtracted symmetrically from
the output voltage of amplifier Amp 1 and added. The comparators switch with
hysteresis. The logic gates have open-collector outputs.
If the inhibit input A or B is connected to ground, output A or B will always be high.
Block Diagram
Outputs A, B, C, D are open-collector
IEB00091
20 k
20 k
Amp 3
R
_
+
_
+
+
_
K1
K2
Amp 1
Amp 2
1
1
1
1
V = 1
V = 1
11
1
5
S
+
VV
REF
2
10
4
13
3
12
14
V
Stab
A
Inhibit A
C
D
Inhibit B
B
7
8
9
6
V
7
V
8
V
9
V
6
_
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