AD780 2.5 V Reference Feeding an ADC Load

About this circuit

# AD780 2.5 V Reference Feeding an ADC Load ## Application This circuit uses AD780 as a selectable precision reference feeding an ADC-style load. The shown operating point focuses on the 2.5 V reference setting, which is common for low-voltage converters and precision 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, TRIM, and RANGE support pins are parked on the return bus for a defined 2.5 V operating point. ## Expected Behavior Vout should settle near 2.5 V. With RLOAD at 10K, the reference load current is about 250 uA, and the table should show Vin near 5 V with Vout near the selected reference value. ## Key Values - VIN: 5 V DC input supply. - RLOAD: 10K reference load. - TEMP, TRIM, and RANGE: parked on the return bus for the shown 2.5 V operating point. - Expected output: about 2.5 V at Vout. ## Suggested Experiments - Change RLOAD to compare output loading at the selected reference value. - Reconnect RANGE for the alternate reference setting and compare the Vout row. - Add an ADC input or comparator threshold node driven from Vout. ## Featured Component AD780 Voltage Reference is the selectable reference under test. The demo highlights its input, output, range-select, trim, temperature, and return pins in one readable operating-point schematic.