ADR1000AHZ

Overview

The ADR1000AHZ is a 6.62 V oven-compensated, buried Zener voltage reference built on Analog Devices' proprietary bipolar process. It serves as a pin-compatible replacement for the LTZ1000. The device integrates a buried Zener reference, an on-chip heater resistor, and temperature sensing transistors. It achieves a typical long-term drift of 0.5 ppm/year after the first 3000 hours and a temperature coefficient of less than 0.2 ppm/°C. The unit operates within an extended industrial temperature range of −40°C to +125°C and is housed in an industry-standard, hermetically sealed 8-pin TO-99 metal can package.

Feature Summary

• On-chip heater and temperature sensor maintain constant internal temperature above ambient range
• Hermetically sealed 8-pin TO-99 metal can package resists humidity effects
• Pin-compatible upgrade to LTZ1000 with optimized stability characteristics

Applications

• High accuracy instrumentation
• Multimeters
• Weigh scales
• Electric balance
• Automatic test equipment

Procurement Notes

Verify that the ordering suffix 'H' corresponds to the H-08-1 packing option (Box, 100 units) and 'Z' confirms RoHS compliance. Confirm the specific application circuit utilizes recommended external components to achieve specified thermal drift performance. Ensure PCB layout prevents thermocouple errors between Kovar leads and copper traces.

Selection Notes

Select this component when maintaining high precision over long calibration intervals or product lifetimes is critical. The integrated oven control eliminates the need for external heating elements. Verify that external op amps and resistors meet low noise and drift requirements to fully utilize the reference's stability potential.

Part Context

The ADR1000 series represents a class of high-stability voltage references utilizing buried Zener technology. This specific model provides a direct drop-in replacement for legacy LTZ1000 designs while offering improved long-term stability metrics. It is designed for applications requiring minimal output variation over time and temperature changes.

Replacement Considerations

ADR1000AHZ is a pin-compatible replacement for LTZ1000. Verify initial accuracy differences; ADR1000 offers ±50 mV compared to LTZ1000's −200/+300 mV. Adjust external biasing circuits if necessary to match specific operating current requirements.