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Part: TCA965
Category:
Description: .
Company: Infineon Technologies Corporation
Datasheet: Download TCA965 datasheet File size : 373 kB
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Window Discriminator
TCA 965 B
Preliminary Features
q
Bipolar IC
q q q
Two window settings direct setting of lower and upper edge voltage (window edges) indirect setting by window center voltage and half window width Adjustable hysteresis Digital outputs with open collectors for currents up to 50 mA Adjustable reference voltage VStab
P-DIP-14-1
Type s TCA 965 B s Not for new design
Ordering Code Q67000-A8338
Package P-DIP-14-1
The window discriminator compares an input voltage to a defined voltage window. The digital outputs show whether the input voltage is below, within or above this window. The TCA 965 B window discriminator is especially suitable as a tracking or compensating controller with a dead band in control engineering and for the selection of DC voltages within a certain tolerance of the required setpoint value in measurement engineering. When it is used as a Schmitt trigger, switching frequencies up to a typical value of 50 kHz are possible.
Semiconductor Group
1
1998-02-10
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.
+ VS 11 1
VREF
5
20 k
20 k
R
Amp 3
10
V7
7 _ +
+ _ K1
Amp 1
V8
8
1
V=1 12 Amp 2 _
V9 V6
9 6 V=1
+ _ K2
Outputs A, B, C, D are open-collector
Block Diagram Semiconductor Group 2 1998-02-10
+
_
VStab
1
2
A
4
_ <1
Inhibit A
13
C
3
D
Inhibit B
+
1
14
B
IEB00091
TCA 965 B
Pin Configuration (top view)
TCA 965 B
GND A D Inhibit A 1 2 3 4 5 6 7 14 13 12 11 10 9 8
IEP00292
B C Inhibit B +V S
V REF V6 V7
V Stab V9 V8
Pin Definitions and Functions Pin Symbol Direct Setting of Window 1 2 3 4 5 6 7 8 9 10 11 12 13 14 GND A D Inhibit A GND Logic output A Logic output D = A @ B (AND) Connected to GND: logic output A = HIGH Internal VREF = 3 V Upper edge voltage Lower edge voltage Input voltage GND Input voltage V6/7 Input voltage V6/7 Center voltage Half window width Pin Function in Indirect Setting
V REF V6 V7 V8 V9 VStab + VS
Inhibit B C B
Internal VStab = 6 V Supply voltage Connected to GND: logic output B = HIGH Logic output C = A @ B (NAND) Logic output B 3 1998-02-10
Semiconductor Group
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