Analog Devices Inc. AD574AKPZ

Overview

AD574AKPZ from Analog Devices is a monolithic 12-bit successive-approximation analog-to-digital converter (ADC) with on-chip reference, requiring no external components for full conversion functionality. It delivers ±1/2 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 features internal 10.00 V ±0.2% buried Zener reference - used in precision industrial data acquisition and test instrumentation.

For engineers reviewing the AD574AKPZ datasheet, AD574AKPZ pinout, AD574AKPZ application, or AD574AKPZ equivalent, key selection considerations include guaranteed 12-bit no-missing-codes performance, ±1/2 LSB total unadjusted error (TUE), dual-mode (12-/8-bit) parallel interface timing, and ceramic DIP-28 package compatibility with legacy high-reliability systems.

Technical Context

The AD574AKPZ implements a fully integrated successive-approximation register (SAR) architecture with internal 12-bit current-output DAC, comparator, clock generator, and control logic. Its conversion cycle is self-timed (max 35 µs for 12-bit), initiated via CE/CS/R/C signals, and outputs left-justified parallel data through three-state DB11–DB0 buffers.

It uses a temperature-compensated buried Zener reference (10.00 V ±0.2%) capable of sourcing 1.5 mA, and includes trimmed thin-film scaling resistors (5 kΩ for 10 V span, 10 kΩ for 20 V span) enabling direct analog input connection without external gain stages. Bipolar offset is set via dedicated BIP OFF pin referenced to internal 10 V.

Key Specifications

Pinout & Package

AD574AKPZ is housed in a 28-pin hermetically sealed ceramic dual-in-line package (D-28), rated for 0°C to +70°C operation and suitable for high-reliability, low-drift analog signal conditioning environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD574AKPZ, AD7874KN offers faster throughput but sacrifices direct 10 V reference and bipolar input convenience; MAX160BCNG+ reduces supply complexity but adds external component overhead for full-scale range flexibility.

Availability

AD574AKPZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, avionics sensor interfaces, and medical diagnostic instrumentation requiring stable component supply across extended product lifecycles.

Supply support for AD574AKPZ 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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD574A family was designed specifically for high-accuracy, standalone 12-bit data acquisition in environments where reliability, long-term stability, and minimal external component count are mandatory - targeting legacy and upgrade paths in military, aerospace, and industrial control systems.

FAQ

What is the operating temperature range for the AD574AKPZ?

The AD574AKPZ is rated for operation from 0°C to +70°C. This commercial-grade temperature specification is confirmed in the Ordering Guide and applies specifically to the "K" grade variant. The device guarantees ±1/2 LSB linearity error and 12-bit no-missing-codes performance across this full range. Unlike the "S", "T", or "U" grades, the AD574AKPZ does not support extended military or automotive temperature ranges.

Does the AD574AKPZ require external components to function as a complete ADC?

No, the AD574AKPZ requires no external components to perform full 12-bit successive-approximation conversion. It integrates a 10.00 V ±0.2% buried Zener reference, trimmed thin-film scaling resistors (5 kΩ and 10 kΩ), comparator, clock generator, and SAR logic. Only power supplies (+5 V, +12/+15 V, –12/–15 V), analog input, and control signals (CE, CS, R/C, A0) are needed - making AD574AKPZ a true single-chip ADC solution.

How is bipolar operation configured on the AD574AKPZ?

Bipolar operation on the AD574AKPZ is configured by connecting the BIP OFF pin (Pin 12) to the REF OUT pin (Pin 8), enabling the internal 10 V reference to bias the DAC array for symmetric ±5 V or ±10 V input ranges. Analog inputs are applied to either 10VIN (Pin 13) or 20VIN (Pin 14). Calibration uses two trim points: first transition at –4.9988 V (±5 V range) and last transition at +4.9963 V, both adjusted using external 100 Ω potentiometers per the datasheet.

What is the purpose of the 12/8 pin on the AD574AKPZ?

The 12/8 pin on the AD574AKPZ selects the data output format: when tied to VLOGIC (+5 V), it enables 12-bit parallel output on DB11–DB0; when tied to Digital Common (Pin 15), it configures the device for 8-bit bus interface - where AO selects either the 8 MSBs (AO = 0) or 4 LSBs + 4 trailing zeroes (AO = 1). This pin is not TTL-compatible and must be hard-wired - never driven by logic gates - to avoid undefined behavior or damage.

Can the AD574AKPZ operate from ±12 V supplies instead of ±15 V?

Yes, the AD574AKPZ supports ±12 V supplies per its Absolute Maximum Ratings and Power Supply sections. However, when using ±12 V, the internal reference output current capability drops due to reduced headroom, and Analog Devices recommends buffering the REF OUT with an op amp (e.g., AD708) if external loads exceed 1 mA or if operation over the full temperature range is required. Unbuffered ±12 V use is acceptable only with light, constant reference loading.