Analog Devices Inc. AD671KD-500

Overview

AD671KD-500 from Analog Devices is a monolithic 12-bit, 2 MHz analog-to-digital converter in a 24-pin ceramic DIP package, featuring 500 ns max conversion time, ±2 LSB integral nonlinearity, unipolar/bipolar input range selection via pin strapping, and out-of-range (OTR) flag output. It serves high-speed data acquisition systems requiring precise digitization of ±5 V, 0–5 V, or 0–10 V analog signals in test equipment and real-time control.

For engineers reviewing the AD671KD-500 datasheet, AD671KD-500 pinout, AD671KD-500 application, or AD671KD-500 equivalent, this page delivers verified technical context, exact pin functions, confirmed DC/digital timing specs, validated alternatives, and application-specific interface guidance - all grounded in the official AD671 Rev. B datasheet and Analog Devices' product documentation.

Technical Context

The AD671KD-500 employs a subranging flash architecture with four internal flash stages, digital error correction logic, and an on-chip timing generator that synchronizes strobe pulses for each stage while ensuring adequate settling time for the interflash residue amplifier. Its ABCMOS-1 process integrates high-speed bipolar circuitry for analog sections and low-power CMOS for logic, enabling 2 MHz throughput with <500 mW power consumption.

Input range configuration is determined by strapping BPO/UPO (Pin 21) to AIN, ACOM, or REF IN - selecting 0–5 V, 0–10 V, or ±5 V spans respectively - while output format (offset binary or twos complement) is controlled by MSB (Pin 13) and BIT1–BIT12 (Pins 12–1, 1) outputs. The OTR (Pin 14) signal asserts HIGH when input exceeds selected span limits.

Key Specifications

Pinout & Package

AD671KD-500 is housed in a 24-pin ceramic Dual In-line Package (DIP), 0.300 inch wide, designated D-24A per Analog Devices' ordering guide. Pin numbering follows standard top-view DIP convention with Pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed 12-bit ADC applications.

Compared with AD671KD-500, AD670KD-500 trades resolution and diagnostics for cost and simplicity, while ADS807U shifts to SAR architecture and single-supply operation - neither offers pin-compatible drop-in replacement, but both address adjacent performance tiers in high-speed data acquisition.

Availability

AD671KD-500 is available at Aetrix Electronics and suitable for automated test equipment, real-time motor control, high-fidelity data acquisition, and military avionics signal conditioning requiring stable component supply across extended lifecycle programs.

Supply support for AD671KD-500 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, founded in 1965 and headquartered in Wilmington, MA.

The AD671 family was designed specifically for high-speed, high-accuracy digitization in instrumentation and control systems where monolithic integration, deterministic timing, and hardware-configurable ranges deliver system-level reliability and reduced bill-of-materials.

FAQ

What is the maximum guaranteed conversion time for AD671KD-500?

The AD671KD-500 has a maximum guaranteed conversion time of 500 ns across its full operating temperature range (0°C to +70°C). This specification is tested on all units at final electrical test under worst-case supply voltages and temperature extremes, ensuring consistent 2 MHz sampling capability in production systems. The actual typical conversion time is 475 ns, but system timing margins must be based on the 500 ns max value.

How does the BPO/UPO pin configure input ranges on AD671KD-500?

On the AD671KD-500, the BPO/UPO pin (Pin 21) selects input range by physical connection: tying to AIN sets 0 V to +5 V unipolar; tying to ACOM sets 0 V to +10 V unipolar; tying to REF IN sets –5 V to +5 V bipolar. No external logic or configuration registers are involved - range selection is purely hardware-strapped, enabling robust, glitch-free mode switching in harsh environments.

Does AD671KD-500 support twos complement output format?

Yes, the AD671KD-500 supports twos complement output via the dedicated MSB pin (Pin 13), which provides the inverted most significant bit. When used alongside BIT1–BIT12 (Pins 12–1, 1), this enables direct twos complement interpretation without external logic. Offset binary remains available by ignoring MSB and using BIT1–BIT12 alone - both formats are simultaneously present and hardware-selectable.

What is the purpose of the OTR (Out-of-Range) output on AD671KD-500?

The OTR output (Pin 14) on AD671KD-500 is an active-HIGH signal that asserts whenever the analog input voltage exceeds the selected span - either above +5 V/+10 V or below 0 V in unipolar modes, or beyond ±5 V in bipolar mode. It provides immediate hardware-level fault detection, enabling real-time clamping, alarm triggering, or automatic gain scaling without CPU intervention or software polling.

Can AD671KD-500 operate with a single +5 V supply?

No, the AD671KD-500 requires three separate supplies: +5 V on VCC (Pin 23), –5 V on VEE (Pin 24), and +5 V on VLOGIC (Pin 17). These are not interchangeable - VCC and VEE power the analog core and DACs, while VLOGIC powers digital output buffers and logic. Using a single +5 V rail will prevent proper operation and may damage the device, as confirmed by absolute maximum ratings and functional block diagram requirements.