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