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Q67000-A8338

Window Discriminator

Infineon Technologies 

TCA 965 B

Functional Description

Amplifier Amp 3 increases the voltage of the reference source R to VStab = 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 (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

+ VS

11

VREF

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

VStab

2

4

13

1

3

12

14

A

Inhibit A

C

D

Inhibit B

B

IEB00091

1998-02-10

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