Analog Devices Inc. AD574AJP

Overview

AD574AJP from Analog Devices is a monolithic 12-bit successive-approximation analog-to-digital converter with internal 10 V reference, ±12 V/±15 V dual supplies, and 35 µs max 12-bit conversion time. It supports unipolar (0 V to +10 V/+20 V) and bipolar (±5 V/±10 V) input ranges, features 12-bit no-missing-codes guarantee for K-grade variants, and is used in precision data acquisition systems requiring stable DC accuracy.

For engineers reviewing the AD574AJP datasheet, AD574AJP pinout, AD574AJP application, or AD574AJP equivalent, key selection considerations include guaranteed linearity error (±1/2 LSB for K-grade), internal reference stability (±10 ppm/°C full-scale T.C.), unipolar/bipolar offset adjustability, and PLCC-28 package compatibility with 8-bit or 12-bit parallel data interface modes.

Technical Context

The AD574AJP implements a fully integrated successive-approximation register (SAR) architecture with internal current-output DAC, comparator, clock generator, and output buffers. Its 12-bit conversion is initiated via CE/CS/R/C control logic and supports both 12-bit parallel and split 8-bit read modes using AO and 12/8 pins.

It uses a temperature-compensated buried Zener reference trimmed to 10.00 V ±0.2%, delivering up to 1.5 mA output current. Input scaling employs factory-trimmed thin-film resistors (5 kΩ for 10 V span, 10 kΩ for 20 V span), enabling direct connection of unipolar or bipolar signals without external gain components.

Key Specifications

Pinout & Package

AD574AJP is housed in a 28-pin Plastic Leaded Chip Carrier (PLCC-28, P-28A) package with J-grade temperature range (0°C to +70°C). The package is leaded, surface-mountable, and RoHS-compliant per Analog Devices' standard industrial offerings.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7874KN and MAX197BCNI+, the AD574AJP offers superior DC accuracy (±1/2 LSB INL), hardware-configurable bipolar/unipolar input, and self-contained ±12 V/±15 V analog power domain - making it optimal for high-fidelity, single-channel industrial and test equipment where absolute linearity and ease of calibration are prioritized over speed or channel count.

Availability

AD574AJP is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, aerospace sensor interfaces, and medical instrumentation requiring stable component supply across extended product lifecycles.

Supply support for AD574AJP 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, founded in 1965 and headquartered in Wilmington, MA.

The AD574AJP belongs to the legacy AD574A family of monolithic 12-bit ADCs designed for precision DC-coupled data acquisition in industrial, military, and instrumentation applications where reliability, long-term stability, and minimal external component count are essential.

FAQ

What is the guaranteed linearity error specification for the AD574AJP over its full operating temperature range?

The AD574AJP is a J-grade variant of the AD574A family and guarantees ±1 LSB maximum linearity error from 0°C to +70°C. This is confirmed in the Ordering Guide and Specifications tables, where AD574AJ(X) models (including AD574AJP) are explicitly rated for ±1 LSB linearity over TMIN to TMAX. While K-grade variants like AD574AKP offer ±1/2 LSB, the AD574AJP maintains robust 12-bit monotonicity with no missing codes down to 11 bits across temperature.

Does the AD574AJP include an internal voltage reference, and what is its accuracy and output capability?

Yes, the AD574AJP integrates a temperature-compensated buried Zener reference trimmed to 10.00 V ±0.2% (±20 mV). It delivers up to 1.5 mA of output current for external loads, sufficient to drive the internal 5 kΩ/10 kΩ scaling resistors and bipolar offset network. When used with ±12 V supplies or under full-temperature conditions, Analog Devices recommends buffering the reference to maintain stability - a requirement explicitly noted in the datasheet's "Notes" section for the AD574AJP.

What package type and pin count does the AD574AJP use, and is it compatible with standard PLCC sockets?

The AD574AJP uses a 28-pin Plastic Leaded Chip Carrier (PLCC-28, package code P-28A) with a 1.27 mm pitch and J-bend leads. It is mechanically compatible with industry-standard PLCC-28 sockets and reflow soldering profiles for surface-mount assembly. The package is specified in the "PACKAGE OPTIONS" table under "PLCC (P-28A)" with model AD574AJP explicitly listed, confirming its physical and thermal compliance with JEDEC MS-026 standards.

Can the AD574AJP operate with ±12 V analog supplies instead of ±15 V, and what impact does this have on performance?

Yes, the AD574AJP supports ±12 V analog supplies (VCC = +12 V ±0.6 V, VEE = –12 V ±0.6 V) as specified in the "POWER SUPPLIES" table. Operation at ±12 V reduces power dissipation and heat generation but requires external buffering of the internal reference if >1.5 mA load is applied across the full temperature range - a condition explicitly called out in Note 3 of the datasheet. All key AC/DC specifications including linearity, conversion time, and noise remain unchanged.

How does the AD574AJP handle 8-bit versus 12-bit data read operations, and what control pins configure this behavior?

The AD574AJP supports both 8-bit and 12-bit parallel data reads via hardware configuration. The 12/8 pin selects format: tied to VLOGIC for 12-bit word output, or to Digital Common for two 8-bit bytes. The AO pin selects which byte is enabled: AO = 0 enables DB11–DB4 (MSB byte), AO = 1 enables DB3–DB0 plus four trailing zeros (LSB nibble). This dual-mode interface is defined in the Truth Table and Control Logic section, enabling seamless integration with both 8-bit and 16-bit microprocessor buses without external latches.