Comparator with on-chip voltage reference — single-supply threshold detection
The MAX965EUA+ is a single comparator from Analog Devices that integrates a voltage reference on-chip, eliminating the need for an external reference resistor divider in threshold-detection circuits. Quiescent current maxes at 12µA, making it a fit for power-sensitive designs — a sensor threshold monitor that runs continuously draws under 60µW at 5V.
Hysteresis and propagation delay — noise margin vs response time
Built-in ±1mV hysteresis prevents output chatter on slow-moving or noisy input signals near the threshold — a common pain point in thermocouple or photodiode comparators without external positive feedback. Maximum propagation delay is 20µs, which sets the upper frequency of detectable events — adequate for DC-level alarms, over-voltage locks, and low-speed window comparators, but too slow for high-frequency zero-crossing or PWM edge detection. The open-drain, rail-to-rail output stage lets the comparator drive loads referenced to a different supply voltage — pull the output to 3.3V logic while the comparator runs on a 1.8V analog rail.
Supply and temperature range — industrial-grade monitoring
Input offset voltage max is 15mV at 5.5V, and input bias current max is 0.05µA — the offset dominates the threshold error in a divider-based reference, so budget ±15mV uncertainty when setting the trip point. Common-mode rejection is 56.48dB typical and power-supply rejection is 80dB typical — the comparator tolerates ground shifts and supply ripple better than a bare op-amp used as a comparator.
Package and board integration — 8-uMAX/uSOP footprint
Available in an 8-TSSOP or 8-MSOP package (3.00mm width), the supplier device package is 8-uMAX/uSOP — a 3×3 mm body that fits into space-constrained multi-channel boards. Surface-mount assembly with standard 0.65mm pitch — no fine-pitch challenges; a two-layer board with adequate ground plane handles the routing.