ADI's ADR1001 is a fully integrated, ultra-low drift, buried Zener precision voltage reference solution in a single chip. By integrating the entire signal conditioning circuitry required by the LTZ1000 into a single chip, the ADR1001 significantly reduces the overall solution area while simplifying the design process by eliminating the many challenges of building a discrete circuit solution.

The on-chip heater, combined with Analog Devices' buried Zener technology, allows the ADR1001 to achieve sub-ppm temperature coefficient and single-digit ppm long-term drift performance. Besides providing excellent precision in all vectors, the ADR1001 incorporates ease-of-use features to reduce cost and design-in effort. These features include a pin-programmable internal thermostat, resistor-programmable heater current limit, open-collector power-good flag pin, hermetic surface-mount package, and an extra matched resistor pair. By default, the temperature setpoint is +70°C when no external resistor is connected to the TSET pin, and the internal heater current limit is 100 mA with HTR_ILIM shorted to HTR_GND.

The integrated thin-film resistors and on-chip buffer can be used to provide standard output voltage reference values compatible with modern precision converters. The ADR1001 divider network and output buffer combination is trimmed to within ±0.25% initial accuracy. In addition, a pair of matched resistors is also included on-chip, allowing customers to easily generate a negative voltage reference or a gain of 2 with minimal impact on the output accuracy or drift.

The ADR1001 is packaged in a hermetic, ceramic, 20-terminal leadless chip carrier (LCC). The surface-mount ceramic package allows customers to eliminate the through-hole component soldering step while retaining the hermetic seal of a classic through-hole metal can package.