REF192 Shutdown-Capable Reference Operating Point

About this circuit

# REF192 Shutdown-Capable Reference Operating Point ## Application This circuit uses REF192 as a shutdown-capable 2.5 V reference feeding a very light reference input. It is a useful starting point for battery-powered measurement circuits where the reference may be enabled only while sampling. ## Design Context VIN is set to 5 V and feeds U1 from the left. SHDN is tied to VIN so the reference starts enabled, VOUT drives a 100K load on the right, and GND returns to the single bottom return bus. ## Expected Behavior With SHDN tied high, Vout should settle near 2.5 V. The 100K load draws about 25 uA, representing a high-impedance converter or comparator reference input. ## Key Values - VIN: 5 V DC input supply. - SHDN: tied to VIN for enabled operation. - RLOAD: 100K light reference load. - Expected output: about 2.5 V at Vout. ## Suggested Experiments - Tie SHDN to the return bus and compare the enabled and disabled operating points. - Change RLOAD to 10K or 1M to compare load-current effects. - Lower VIN to inspect how the reference behaves as supply headroom is reduced. ## Featured Component REF192 Voltage Reference is the shutdown-capable reference under test. The demo highlights VIN, SHDN, GND, and VOUT so the enabled reference-load application is clear.