AD680 2.5 V Reference Feeding a Light Load

About this circuit

# AD680 2.5 V Reference Feeding a Light Load ## Application This circuit uses AD680 as a 2.5 V precision reference feeding a light ADC-style reference load. It is a practical operating-point check for low-voltage data-converter references and comparator thresholds. ## Design Context VIN is set to 5 V and feeds U1 from the left. VOUT drives RLOAD on the right, GND returns to the bottom bus, and the TEMP support pin is parked on the same return bus so the main 2.5 V reference path remains the focus. ## Expected Behavior Vout should settle near 2.5 V. With RLOAD at 10K, the output load is about 250 uA, and the Vin/Vout probes make the input supply and reference output visible in the operating-point table. ## Key Values - VIN: 5 V DC input supply. - RLOAD: 10K reference load. - TEMP: parked on the return bus for this operating-point demo. - Expected output: about 2.5 V at Vout. ## Suggested Experiments - Change RLOAD to 4.7K or 100K and compare Vout under different load currents. - Lower VIN toward 2.5 V to inspect input-headroom behavior. - Route the TEMP pin into a measurement circuit when adapting the demo for temperature monitoring. ## Featured Component AD680 Voltage Reference is the 2.5 V reference under test. The demo highlights its VIN, GND, VOUT, and TEMP terminals in a compact reference-load application.