Analog Devices Inc. AD574AJD

Overview

AD574AJD from Analog Devices is a complete 12-bit monolithic successive-approximation analog-to-digital converter (ADC) with on-chip reference, clock, and three-state data outputs. It delivers ±1 LSB linearity error over 0°C to +70°C, supports unipolar (0 V to +10 V / +20 V) and bipolar (±5 V / ±10 V) input ranges, and operates from ±12 V or ±15 V analog supplies plus +5 V logic supply - used in precision industrial data acquisition, test instrumentation, and process control systems.

For engineers reviewing the AD574AJD datasheet, AD574AJD pinout, AD574AJD application, or AD574AJD equivalent, this page provides verified technical context, exact pin functions, real-world use cases, and validated alternative parts for system-level design and sourcing decisions.

Technical Context

The AD574AJD implements a fully integrated successive-approximation register (SAR) architecture with internal 12-bit current-output DAC, comparator, and temperature-compensated buried Zener reference (10.00 V ±0.2%). Conversion is initiated via CE/CS/R/C control logic and completes in 15–35 µs (12-bit) or 10–24 µs (8-bit), with STS output signaling conversion status.

It supports dual data modes: 12-bit parallel output (12/8 = VLOGIC) or byte-accessible 8-bit interface (12/8 = DIGITAL COMMON), with AO selecting MSB or LSB nibble. Input impedance is 5 kΩ (10 V span) or 10 kΩ (20 V span); reference output supplies up to 1.5 mA but requires buffering under ±12 V operation or varying external loads.

Key Specifications

Pinout & Package

Ceramic DIP-28 (D-28) package with hermetic sealing and gold-plated leads - rated for industrial temperature range (0°C to +70°C) and compatible with standard through-hole PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7874KN and ADS7800KP, the AD574AJD offers superior linearity (±1 LSB) and full integration (reference + clock), making it optimal for applications where calibration stability and minimal external components are prioritized over raw speed or lowest unit cost.

Availability

AD574AJD is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and medical instrumentation requiring stable component supply across extended production lifecycles.

Supply support for AD574AJD 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 AD574A family was designed as a single-chip solution for precision data acquisition in environments where reliability, long-term calibration stability, and reduced system integration effort were critical - targeting industrial, aerospace, and medical instrumentation markets.

FAQ

What is the maximum conversion time for AD574AJD at full 12-bit resolution?

The AD574AJD has a maximum conversion time of 35 µs for a full 12-bit conversion cycle at +25°C and nominal supply conditions. This value remains valid across its specified industrial temperature range (0°C to +70°C), with typical performance at 24 µs. The timing is internally generated - no external clock is required to achieve this specification. The AD574AJD guarantees deterministic conversion latency, essential for real-time control loop timing budgets.

Does AD574AJD require an external reference voltage?

No, the AD574AJD does not require an external reference voltage. It integrates a temperature-compensated buried Zener reference trimmed to 10.00 V ±0.02 V, capable of sourcing up to 1.5 mA. This internal reference enables fully self-contained operation for both unipolar and bipolar input configurations. External buffering is recommended only when operating from ±12 V supplies or when driving variable external loads during conversion.

How is the AD574AJD configured for ±10 V bipolar input range?

To configure AD574AJD for ±10 V bipolar input, connect Pin 12 (BIP OFF) to Pin 8 (REF OUT), apply the analog signal between Pin 14 (20VIN) and Pin 9 (ANA COMMON), and ensure Pin 10 (REF IN) is connected to Pin 8. This configuration uses the internal 10 kΩ bipolar offset resistor and 10 kΩ input scaling network. Calibration requires adjusting R1 for first transition at –9.9988 V and R2 for last transition at +9.9963 V - procedures detailed in the AD574A datasheet Figure 5.

What package type and lead finish does AD574AJD use?

The AD574AJD uses a ceramic dual-in-line package (D-28), designated as "D" in Analog Devices' ordering nomenclature. It features a hermetically sealed ceramic body with gold-plated leads, rated for industrial temperature operation (0°C to +70°C). This package provides superior moisture resistance, thermal stability, and long-term reliability compared to plastic DIP variants - critical for mission-critical instrumentation and aerospace-qualified designs.

Can AD574AJD interface directly with an 8-bit microcontroller bus?

Yes, the AD574AJD supports direct 8-bit microcontroller interface via its configurable data mode. By tying Pin 24 (12/8) to DIGITAL COMMON and using Pin 11 (AO) to select nibbles, the device outputs the 8 MSBs when AO = 0 and the 4 LSBs + 4 trailing zeroes when AO = 1. This eliminates need for external latches or bus transceivers. Timing parameters (e.g., tDD = 200 ns access time) are compatible with standard 8051 and Z80 derivatives operating at ≤12 MHz.