AD680AR-REEL7

Overview

The AD680AR-REEL7 is a band gap voltage reference providing a fixed 2.5 V output from input voltages between 4.5 V and 36 V. It features laser-trimmed initial accuracy of ±5 mV and a maximum temperature coefficient of 20 ppm/°C over the −40°C to +85°C range. Quiescent current is typically 195 μA, with a maximum of 250 μA. Noise performance includes 8 μV p-p (0.1 Hz to 10 Hz) and 250 nV/√Hz wideband density. The device operates in an 8-lead SOIC package.

Feature Summary

• Laser trimmed for high initial accuracy and low temperature drift without external components
• Low quiescent current suitable for power-sensitive applications
• Integrated temperature output pin on 8-lead packages for transducer configuration

Applications

• Reference for ADCs and DACs requiring external precision voltage
• Voltage regulator for portable equipment power supplies
• Hand-held battery-operated meters

Procurement Notes

Verify the specific suffix REEL7 indicates a tape and reel packaging format containing 1,000 parts per reel as defined in the ordering guide. Confirm the AR grade corresponds to the specified −40°C to +85°C operating temperature range and 20 ppm/°C temperature coefficient limits. Ensure compatibility with 8-lead SOIC surface-mount assembly processes.

Selection Notes

Select this component when a stable 2.5 V reference is required with strict low-power constraints. The AR grade offers tighter accuracy and lower drift than JR grades. The inclusion of a temperature output pin distinguishes it from simpler two-terminal references, allowing dual functionality as a temperature sensor while maintaining precise voltage regulation.

Part Context

The AD680 series utilizes a patented band gap architecture merging the amplifier and core reference functions. This design achieves performance rivaling incomplete references while offering superior DC characteristics. The family includes variants in PDIP, SOIC, and TO-92 packages, catering to different thermal and mechanical integration needs across industrial and consumer electronics.

Replacement Considerations

AD680JR-REEL7: Lower accuracy grade (±10 mV), higher drift (25 ppm/°C), and limited to 0°C to 70°C operation.

FAQ

What is the function of Pin 3 on the 8-lead package?

Pin 3 is the Temperature Output (TEMP). It provides a voltage linearly proportional to temperature, nominally 596 mV at 25°C with a sensitivity of 2 mV/°C.

How does the AD680 handle transient loads from switching networks?

It can drive fast transients by using a series resistor to decouple the output or a large capacitor (recommended 50 nF) connected from the output to ground to serve as a charge storage element.