AD680JNZ

Overview

The AD680JNZ is a band gap voltage reference providing a fixed 2.5 V output from input voltages between 4.5 V and 36 V. It operates with a maximum quiescent current of 250 μA. The device features laser trimming for high accuracy, with an initial accuracy of ±10 mV (±0.4%) and a temperature coefficient of 25 ppm/°C over the 0°C to 70°C range. Noise performance includes 8 μV p-p from 0.1 Hz to 10 Hz and 250 nV/√Hz wideband spectral density. It is housed in an 8-lead PDIP package.

Feature Summary

• Laser trimmed for high accuracy and low temperature drift without external components
• Low quiescent current suitable for battery-operated equipment
• Integrated temperature output pin on 8-lead packages for transducer applications

Applications

• Reference for ADCs and DACs requiring external precision voltage
• Hand-held and battery-operated meters
• Differential temperature transducers

Procurement Notes

Verify the specific suffix 'Z' indicates lead-free compliance when sourcing replacements. Confirm the 'JN' designation matches the required 0°C to 70°C operating temperature range rather than the wider industrial grade. Ensure the 8-lead PDIP package form factor aligns with existing board layouts.

Selection Notes

Select this component when a complete, low-power voltage reference is needed that outperforms standard on-chip references. The 8-lead package allows utilization of the dedicated temperature output pin, enabling dual functionality as a temperature sensor alongside the stable 2.5 V reference.

Part Context

The AD680 series utilizes a patented band gap architecture merging the amplifier and core functions. This design achieves excellent DC characteristics and noise performance at very low power levels, rivaling incomplete two-terminal references while offering superior accuracy and stability over temperature.

Replacement Considerations

AD680JN

FAQ

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

Pin 3 is the Temperature Output (TEMP) pin. 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 relatively large capacitor connected from the output to ground to serve as a charge storage element.