TCA965B Integrated Circuit Chip Window Discriminator ( Bipolar IC )
electronics ic chip
,integrated circuit ic
Window Discriminator TCA 965 B
Features
● 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
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.
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.
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