Analog Devices Inc. AD574AJD/+

Overview

AD574AJD/+ from Analog Devices is a complete 12-bit monolithic successive-approximation analog-to-digital converter with internal reference, ±1 LSB linearity error over 0°C to +70°C, 35 µs max 12-bit conversion time, and selectable unipolar (0 V to +10 V / +20 V) or bipolar (±5 V / ±10 V) input ranges-used in precision data acquisition systems requiring high DC accuracy and minimal external components.

For engineers reviewing the AD574AJD/+ datasheet, AD574AJD/+ pinout, AD574AJD/+ application, or AD574AJD/+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for industrial instrumentation, test equipment, and embedded control systems where guaranteed 11-bit no-missing-codes performance and ±1 LSB linearity are critical selection criteria.

Technical Context

The AD574AJD/+ integrates a 12-bit current-output DAC, temperature-compensated buried Zener reference (10.00 V ±0.2%), comparator, successive-approximation register (SAR), and output buffers-all on a single die. It operates with ±12 V or ±15 V analog supplies and +5 V logic supply, supporting both 12-bit parallel and byte-mode (8-bit + 4-bit) digital interfaces via CE/CS/R/C/A0/12/8 control lines.

Its analog input architecture uses thin-film trimmed 5 kΩ (10 V span) or 10 kΩ (20 V span) scaling resistors and a 10 kΩ bipolar offset resistor; unipolar offset is adjustable to zero (±2 LSB initial, ±2 LSB/°C max), and full-scale calibration error is trimmable to ≤0.25% of FS using an external 50 Ω resistor between REF OUT and REF IN.

Key Specifications

Pinout & Package

Ceramic DIP-28 (D-28) package with hermetic seal, rated for 0°C to +70°C operation and suitable for high-reliability industrial environments. Pin spacing conforms to standard 0.3-inch DIP footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD574AJD/+, AD7870JN offers higher speed and lower power but demands full external support circuitry, while ADS7800KP simplifies supply design and logic interface yet sacrifices bipolar range capability and rugged packaging-making AD574AJD/+ optimal for legacy industrial systems needing drop-in replacement with proven thermal and EMI robustness.

Availability

AD574AJD/+ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and medical instrumentation requiring stable component supply, long-lifecycle support, and traceable sourcing of legacy high-precision ADCs.

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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD574A product line was engineered for high-accuracy, low-drift data acquisition in harsh environments-emphasizing integrated reference stability, guaranteed linearity over temperature, and minimal external component count for turnkey 12-bit conversion.

FAQ

What is the maximum operating temperature range for the AD574AJD/+?

The AD574AJD/+ is rated for operation from 0°C to +70°C. This commercial-grade temperature range is specified in the Ordering Guide and confirmed across all electrical parameters in the "AD574AJ(X)" row of the specification tables. The device maintains ±1 LSB linearity error and guaranteed 11-bit no-missing-codes performance across this full range. Operation outside this range is not characterized and may result in degraded accuracy or reliability.

Does the AD574AJD/+ require external components to perform a full 12-bit conversion?

No-the AD574AJD/+ is a complete monolithic 12-bit successive-approximation ADC that requires no external DAC, comparator, clock, or timing logic. Its internal 10 V buried Zener reference, trimmed thin-film resistors, and SAR architecture enable self-contained operation. Only power supplies (+5 V, ±12 V or ±15 V), analog input, and control signals (CE/CS/R/C/A0/12/8) are needed. Calibration trims (offset/gain) are optional and use simple external potentiometers or fixed resistors.

How does the AD574AJD/+ handle bipolar versus unipolar input configurations?

The AD574AJD/+ supports both modes via hardware configuration: for unipolar (0 V to +10 V or 0 V to +20 V), connect BIP OFF (Pin 12) to Analog Common (Pin 9); for bipolar (±5 V or ±10 V), connect BIP OFF to REF OUT (Pin 8). Input selection is made by driving either 10VIN (Pin 13) or 20VIN (Pin 14). The internal 5 kΩ/10 kΩ scaling resistors and 10 kΩ offset resistor are factory-trimmed for absolute calibration in both modes.

Can the AD574AJD/+ interface directly to an 8-bit microprocessor bus?

Yes-the AD574AJD/+ supports byte-mode operation via the A0 and 12/8 pins. When 12/8 is tied to Digital Common (Pin 15), data appears as two 8-bit words: A0 = 0 enables DB11–DB4 (MSB byte), A0 = 1 enables DB3–DB0 followed by four trailing zeroes (LSB nibble). This eliminates need for external latches or bus transceivers and allows seamless connection to 8-bit address/data buses like those in Intel 8085 or Zilog Z80 systems.

What is the purpose of the STS (Status) pin on the AD574AJD/+?

The STS pin on the AD574AJD/+ is an active-high status indicator that signals conversion progress: it goes high at the start of any conversion (8-bit or 12-bit) and returns low upon completion. This pin enables polling-based or interrupt-driven data read sequencing-preventing premature access to output buffers. Its timing is synchronized to the internal SAR clock and is independent of CE/CS edge timing, ensuring reliable handshaking in microprocessor-controlled systems.