GENERAL DESCRIPTION

The 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 provides a significant reduction in 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 performance and single-digit ppm long-term drift performance.

Besides providing best-in-class 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 that are 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 to 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 still retaining the hermetic seal of a classic through-hole

metal can package.

FEATURES

► LTZ1000-class, ultrastable, 6.6 V, buried Zener reference

► On-chip, thermally regulated, matched resistor-dividers

► Precision 5 V output ±0.25 (RISET = 102 Ω, TJ = 70°C)

► 5 V output noise (0.1 Hz to 10 Hz): 0.13 ppm p-p

► Zener, thermal loop op amps, and buffer provided on chip

► Input voltage range: 9 V to 36 V

► Hermetic, surface-mount package, 20-terminal LCC

► Ovenization ensures ultra-low temperature drift

APPLICATIONS

► Calibration equipment

► Benchtop digital multimeters

► Automated test equipment (ATE)

► Precision data acquisition systems (DAS)

► Stationary high-precision measurement devices