TCA965B Datasheet, PDF (2/17 Pages) Siemens Semiconductor Group – Window Discriminator

TCA 965 B
Functional Description
Amplifier Amp 3 increases the voltage of the reference source R to V_Stab = 2 x V_REF. The
amplification factor can be altered by external wiring. With direct setting of the window,
the input voltage appears on amplifier Amp 1 (V₈), the upper edge voltage on
comparator K2 (V₆) and the lower edge voltage on comparator K1 (V₇).
With indirect setting of the window, the input voltage appears on inputs V₆ and V₇, while
the center voltage is connected to amplifier A1 (V₈).
The voltage applied to the input (V₉) 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.
V₇
7
Amp 1
V₈
8
V=1
Amp 2
V₉
9
V=1
V₆
6
+ V_S
11
V_REF
1
20 k Ω
5
20 k Ω
_
R
+^{Amp 3}
_
+
_ ^K1
1
+
1
+
_
+
_ ^K2
1
Outputs A, B, C, D are open-collector
Block Diagram
Semiconductor Group
2
10
V_Stab
2
4
13
1
3
12
14
A
Inhibit A
C
D
Inhibit B
B
IEB00091
1998-02-10