TCA965B Window Discriminator IC

TCA965B Window Discriminator IC

The TCA965B is a high-performance window discriminator IC designed for analog signal comparison and monitoring applications. It can determine whether an input voltage lies within or outside a specific voltage range (window), making it ideal for precision level detection, protection, and control systems.

Manufactured by Siemens / Infineon, the TCA965B integrates two high-gain voltage comparators and a logic network that produces output signals depending on the relationship between the input voltage and two preset reference voltages. This allows it to efficiently detect over-voltage, under-voltage, or in-range signal conditions with high accuracy and minimal external components.

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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

Functional Overview

The TCA965B contains two comparators sharing a common input signal.

• One comparator checks whether the input is above the lower threshold.
• The other checks whether it is below the upper threshold.
  The built-in logic section then determines whether the signal lies within or outside the defined voltage window.

This configuration makes the TCA965B ideal for window detection, where precise monitoring of voltage levels is essential. The output can be used to drive relays, LEDs, or digital logic circuits to indicate or act upon out-of-range conditions.

Applications

• Over-voltage and under-voltage monitoring
• Window comparators in control systems
• Battery voltage supervision
• Temperature or sensor signal range detection
• Power supply fault detection
• Instrumentation and measurement systems
• Alarm and protection circuits
• Automation and industrial control equipment