Analog Devices Inc. AD587JR

Overview

AD587JR from Analog Devices is a precision 10 V monolithic voltage reference IC using a buried Zener diode architecture, laser-trimmed for ±10 mV initial accuracy and 20 ppm/°C temperature coefficient over 0°C to 70°C. It delivers low noise (4 μV p-p, 0.1 Hz–10 Hz), 4 mA max quiescent current, and features a dedicated noise-reduction pin and output trim capability. It serves as a high-stability external reference for 12-bit and 14-bit DACs and ADCs in test instrumentation.

For engineers reviewing the AD587JR datasheet, AD587JR pinout, AD587JR application, or AD587JR equivalent, key selection considerations include its SOIC_N-8 package, 10 V output stability under load and line variation, noise-reduction capacitor interface, fine-trim adjust range (±1%), and compatibility with precision converter biasing and current-source configurations.

Technical Context

The AD587JR implements a proprietary ion-implanted buried Zener diode combined with laser-trimmed thin-film resistors to achieve superior long-term stability (±15 ppm/1000 hr) and low thermal drift versus bandgap references. Its internal buffer amplifier provides robust dynamic load regulation for transient currents up to ±10 mA.

It supports two critical system-level functions: (1) precision voltage reference via Pin 6 (VOUT) with optional fine adjustment through Pin 5 (TRIM), and (2) broadband noise reduction via external capacitor on Pin 8 (NOISE REDUCTION), forming a low-pass filter with internal 4 kΩ resistance to suppress Zener-generated noise.

Key Specifications

Pinout & Package

AD587JR is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch, 5.00 mm × 4.00 mm body, and 1.75 mm height. Pins 1, 3, and 7 are unconnected internal test points and must remain floating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Compared with REF5010AIDR and ADR441BRZ, the AD587JR offers optimal balance of proven Zener stability, industry-standard SOIC-8 footprint, and cost-effective 20 ppm/°C performance for 12–14-bit industrial converters-without requiring layout redesign or supply rail changes.

Availability

AD587JR is available at Aetrix Electronics and suitable for high-accuracy data acquisition, automated test equipment, precision current sources, and calibration standard equipment requiring stable component supply across production lifecycles.

Supply support for AD587JR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD587 belongs to Analog Devices' precision voltage reference product line, engineered specifically for metrology-grade converter biasing, calibration infrastructure, and instrumentation where long-term stability and low noise outweigh ultra-low power requirements.

FAQ

What is the guaranteed initial accuracy of the AD587JR?

The AD587JR is laser-trimmed to guarantee an initial output voltage of 10.000 V ±10 mV at 25°C, as specified in the Ordering Guide and confirmed in Table 1 of the Rev. H datasheet. This tolerance applies across all AD587JR variants including AD587JRZ-REEL71 and is verified during production testing. The AD587JR's ±10 mV spec ensures immediate drop-in compatibility with 10 V full-scale converter designs without factory calibration.

Does the AD587JR support negative reference generation?

Yes, the AD587JR can be configured to generate a precision −10.000 V output using the circuit in Figure 17 of the datasheet: tie +VIN to ≥+3.5 V, ground VOUT, and connect GND (Pin 4) through a resistor (RS <1 kΩ) to a −15 V supply. The −10 V appears at Pin 4. Temperature performance and long-term stability remain identical to the standard +10 V configuration, making AD587JR suitable for bipolar data acquisition front-ends.

What is the purpose of the NOISE REDUCTION pin (Pin 8) on the AD587JR?

The NOISE REDUCTION pin (Pin 8) on the AD587JR connects internally to the buried Zener cell's output node and forms a low-pass filter with an external capacitor to ground. Adding a 1 µF capacitor reduces broadband (1 MHz) output noise from 200 μV to ~160 μV p-p. This feature directly improves measurement resolution in low-noise applications like precision weigh scales or seismic sensors where Zener noise dominates system floor.

Can the AD587JR drive multiple DACs simultaneously?

Yes, the AD587JR's buffered output can drive multiple DACs, as demonstrated in Figure 19 using the AD7628 dual DAC. Its ±100 μV/mA load regulation ensures <1 LSB error for 12-bit DACs even with combined loads up to 10 mA. For best results, route VOUT with short, low-inductance traces and use individual 0.1 µF bypass capacitors at each DAC's VREF pin to maintain PSRR and transient response.

Is the AD587JR pin-compatible with other AD587 grades?

Yes, all AD587 variants-including AD587JR (SOIC), AD587JN (PDIP), and AD587JQ (CERDIP)-share identical 8-pin functional mapping and electrical pinout per Figure 2. Pin 2 is +VIN, Pin 4 is GND, Pin 5 is TRIM, Pin 6 is VOUT, and Pin 8 is NOISE REDUCTION. This uniformity allows direct PCB footprint reuse across grades, simplifying design migration from commercial to military or through-hole assembly.