Analog Devices Inc. AD588BQ

Overview

AD588BQ from Analog Devices is a high-precision, dual-tracking voltage reference IC with ±5 V, +10 V, −10 V, +5 V, and −5 V pin-programmable outputs, 1.5 ppm/°C max drift, 1 mV initial error, and Kelvin force/sense capability - used as system calibration reference in 12-bit precision data acquisition systems requiring stable dual-polarity excitation.

For engineers reviewing the AD588BQ datasheet, AD588BQ pinout, AD588BQ application, or AD588BQ equivalent, key selection concerns include guaranteed −25°C to +85°C industrial temperature operation, ±1.5 mV symmetry error in ±5 V tracking mode, 6 µV p-p 0.1 Hz–10 Hz output noise, and CERDIP-16 package compatibility with MIL-STD-883 requirements.

Technical Context

The AD588BQ integrates a laser-trimmed buried Zener reference cell with three precision buffer amplifiers (A2, A3, A4) and thin-film resistor networks to deliver programmable outputs while maintaining 1.5 ppm/°C drift and <1 mV initial error. Its ground-sense amplifier (A2) enables system-ground-referenced Kelvin connections at VHIGH, VLOW, and VCT nodes.

Pin-strapped configurations support ±5 V tracking with <1 mV tracking error, +10 V/−10 V dual outputs, or single +5 V/−5 V outputs - all using internal 10 V span division and trimmable via GAIN ADJ (Pin 5) and BAL ADJ (Pin 12). Noise reduction is implemented via external 1 µF capacitor on NOISE REDUCTION (Pin 7).

Key Specifications

Pinout & Package

AD588BQ is housed in a hermetically sealed 16-lead CERDIP package compliant with MIL-STD-883, rated for −25°C to +85°C operation, with 0.3-inch wide body and 0.07-inch lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR441BRZ and REF5025ID, the AD588BQ uniquely delivers pin-configurable dual-polarity outputs, true Kelvin force/sense, and ±5 V tracking in a single CERDIP package - making it irreplaceable in applications demanding matched bipolar excitation without external amplification or trimming.

Availability

AD588BQ is available at Aetrix Electronics and suitable for high-accuracy data acquisition systems, precision bipolar sensor excitation, and auto-calibrating instrumentation requiring stable component supply across extended temperature ranges.

Supply support for AD588BQ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide.

The AD588 product line was engineered specifically for precision instrumentation requiring guaranteed dual-output tracking, Kelvin connectivity, and industrial/military temperature stability - targeting calibration-critical systems where reference drift dominates overall measurement uncertainty.

FAQ

What is the operating temperature range specified for the AD588BQ?

The AD588BQ is specified for −25°C to +85°C operation, as confirmed in the Rev. M datasheet's Ordering Guide and Table 1. This industrial temperature grade distinguishes it from the JQ/KQ versions (0°C to +70°C) and TE/TQ military grades. The AD588BQ's ±3 ppm/°C drift specification applies across this full range, enabling use in factory-floor PLC modules and outdoor environmental monitors without derating.

Does the AD588BQ support true Kelvin connections for both positive and negative outputs?

Yes, the AD588BQ provides dedicated Kelvin force and sense terminals for both polarities: Pins 1/3 for A3 (typically +10 V/+5 V) and Pins 15/14 for A4 (typically −10 V/−5 V). As described in the "Kelvin Connections" section (Page 11), this architecture eliminates voltage drop errors in high-current or long-trace applications - a capability not found in standard bandgap or buried Zener references without integrated buffers.

Can the AD588BQ generate ±5 V tracking outputs without external components?

Yes, the AD588BQ achieves ±5 V tracking in a single configuration using internal resistive division of its 10 V reference span and the VCT (Pin 11) node, as shown in Figure 5 of the datasheet. No external resistors, op-amps, or trimming are needed to achieve <1 mV tracking error - a feature explicitly guaranteed in Table 1 under "±5 V TRACKING MODE Symmetry Error" for the BQ grade.

What is the purpose of the NOISE REDUCTION pin (Pin 7) on the AD588BQ?

Pin 7 (NOISE REDUCTION) accepts an external capacitor to ground (typically 1 µF) to form a low-pass filter with the internal 4 kΩ resistor (RB), reducing broadband output noise from ~600 µV p-p to ~200 µV p-p (1 MHz BW), as verified in Figure 8. This feature directly addresses low-noise precision measurement needs - such as weigh-scale load cell interfaces - where Zener-generated noise would otherwise limit effective resolution.

How does the AD588BQ differ from the AD588AQ in terms of specifications?

The AD588BQ and AD588AQ share identical pinout, package (16-lead CERDIP), and −25°C to +85°C temperature range, but differ in drift guarantee: AD588BQ is specified at ±3 ppm/°C max (Table 1), while AD588AQ is specified at ±2 ppm/°C max. Both exhibit ±3 mV initial error on ±10 V outputs, but the BQ grade trades tighter drift tolerance for cost efficiency in applications where ±3 ppm/°C meets system accuracy budgets.