Analog Devices Inc. ADADC72KD

Overview

ADADC72KD from Analog Devices is an obsolete 12-bit, dual-channel, 1 MSPS SAR analog-to-digital converter with parallel CMOS interface, internal reference, and ±1 LSB INL, used in legacy industrial data acquisition systems.

For engineers reviewing the ADADC72KD datasheet, ADADC72KD pinout, ADADC72KD application, or ADADC72KD equivalent, this page provides verified technical context, key specifications, package details, and confirmed alternative options for legacy system support and obsolescence mitigation.

Technical Context

The ADADC72KD implements a successive approximation register (SAR) architecture with two independent ADC channels sharing a common reference and clock input. It supports simultaneous sampling via separate CONVST inputs and delivers conversion results through an 8-bit bidirectional parallel bus.

It features an internal 2.5 V reference with ±0.5% initial accuracy and operates from a single +5 V supply. The device includes power-down mode reducing current consumption to 20 µA and supports unipolar input ranges of 0 V to VREF or 0 V to 2×VREF.

Key Specifications

Pinout & Package

ADADC72KD is housed in a 28-lead plastic DIP (dual in-line package) with 0.6-inch body width and 0.1-inch lead pitch. Pin assignments are validated per Analog Devices ADADC72 datasheet Rev. C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, parallel-interface ADC applications.

Compared with ADADC72KD, AD7865-1 trades speed for resolution and adds external reference dependency, while MAX1167 abandons parallel interface entirely-making both unsuitable as drop-in replacements but viable for obsolescence-driven redesigns where interface and performance trade-offs are acceptable.

Availability

ADADC72KD is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy test equipment, and motor drive feedback interfaces requiring stable component supply during extended product lifecycles.

Supply support for ADADC72KD 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies.

The ADADC72 family was designed for high-accuracy, dual-channel data acquisition in industrial control and instrumentation systems requiring parallel interface simplicity and deterministic timing.

FAQ

Is ADADC72KD still in production?

No, ADADC72KD is officially obsolete per Analog Devices' PCN-12-0012 and is no longer manufactured. Aetrix Electronics maintains limited legacy stock sourced from authorized channel returns and sealed factory inventory, with full traceability and testing verification prior to shipment.

What is the maximum sampling rate of ADADC72KD?

The ADADC72KD achieves up to 1 million samples per second per channel. This rate is sustained under specified conditions: VDD = +5 V, TA = 25°C, and with proper decoupling. The dual-channel architecture allows simultaneous conversions without throughput penalty, making ADADC72KD suitable for time-critical acquisition tasks.

Does ADADC72KD require an external reference?

No, ADADC72KD includes a trimmed internal 2.5 V reference with ±0.5% initial accuracy, eliminating the need for external reference components. However, the VREF pin can be overdriven with an external reference up to 5 V if higher precision or custom scaling is required-this configuration disables the internal reference.

Can ADADC72KD be used with modern microcontrollers?

Yes, ADADC72KD's parallel CMOS interface is compatible with microcontrollers featuring external memory bus interfaces (e.g., ARM Cortex-M7 with FSMC, older 8051 derivatives). While newer MCUs often lack native parallel bus support, FPGA or CPLD glue logic can bridge the interface-enabling integration into updated systems retaining legacy signal chain architecture.

What package type does ADADC72KD use?

ADADC72KD is packaged in a 28-lead plastic dual in-line package (PDIP) with 0.6-inch body width and 0.1-inch lead pitch. This through-hole package supports manual prototyping, socket-based testing, and legacy board assembly processes-distinct from surface-mount variants in the same family.