Analog Devices Inc. AD574AJPZ

Overview

AD574AJPZ from Analog Devices is a monolithic 12-bit successive-approximation analog-to-digital converter (ADC) with on-chip reference, clock, and three-state data outputs. It delivers ±1/2 LSB linearity error over 0°C to +70°C, supports unipolar (0 V to +10 V or 0 V to +20 V) and bipolar (±5 V or ±10 V) input ranges, and achieves 35 µs max 12-bit conversion time - used in precision industrial data acquisition and test instrumentation.

For engineers reviewing the AD574AJPZ datasheet, AD574AJPZ pinout, AD574AJPZ application, or AD574AJPZ equivalent, key selection considerations include guaranteed no-missing-codes performance at 12 bits (AK grade), internal 10.00 V ±0.2% Zener reference, ±12 V/±15 V dual supply operation, and 12/8-bit parallel data interface compatibility with 8-bit microprocessor buses.

Technical Context

The AD574AJPZ integrates a 12-bit current-output DAC, temperature-compensated buried Zener reference, comparator, and successive-approximation register (SAR) - enabling complete A/D conversion without external timing or reference components. Its internal 5 kΩ/10 kΩ scaling resistors support selectable 10 V or 20 V unipolar spans and ±5 V/±10 V bipolar spans.

Control logic accepts CE/CS/R/C/A0/12/8 inputs to initiate 8-bit or 12-bit conversions and enable MSB-nibble (DB11–DB8), LSB-nibble (DB7–DB0), or full 12-bit parallel output. STS pin provides end-of-conversion status, and all digital I/O meets standard TTL voltage thresholds with 5 pF pin capacitance.

Key Specifications

Pinout & Package

AD574AJPZ is supplied in a 28-lead plastic leaded chip carrier (PLCC, package code P-28A), with leads arranged in a square J-lead configuration and body size 11.43 mm × 11.43 mm. Pin 1 is marked by a beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7874KN and MAX197ACPP, AD574AJPZ uniquely combines ±12 V analog tolerance, integrated 10 V reference, and parallel 12-bit output - making it irreplaceable in retrofitting legacy industrial controllers and high-accuracy DC measurement systems where supply and interface compatibility are non-negotiable.

Availability

AD574AJPZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, avionics ground-support units, and medical diagnostic instrumentation requiring stable component supply across extended lifecycle programs.

Supply support for AD574AJPZ 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 belongs to Analog Devices' legacy precision SAR ADC product line, engineered for high-accuracy, low-drift DC measurement in industrial, aerospace, and instrumentation systems where long-term stability and guaranteed monotonicity are mandatory.

FAQ

What is the operating temperature range for the AD574AJPZ?

The AD574AJPZ is rated for 0°C to +70°C operation - the "J" grade designation in its part number confirms this commercial temperature range. This specification is validated per the AD574A datasheet Rev. B, with all key parameters including ±1/2 LSB linearity error and 12-bit no-missing-codes guaranteed across this full range. The AD574AJPZ does not support extended or military temperature grades; those are designated by suffixes S, T, or U.

Does the AD574AJPZ require external components to operate?

No, the AD574AJPZ requires no external components to perform a complete 12-bit A/D conversion. Its monolithic design integrates a temperature-compensated 10.00 V Zener reference, internal clock generator, successive-approximation register, and 12-bit current-output DAC. Only power supplies (+5 V, +12/+15 V, –12/–15 V), analog input connections, and control signals (CE, CS, R/C, A0, 12/8) are needed - though external trims (e.g., 50 Ω resistor between REF OUT and REF IN) may be used for full-scale calibration.

How does the AD574AJPZ handle bipolar versus unipolar input ranges?

The AD574AJPZ supports both configurations via dedicated pins: 10VIN and 20VIN accept unipolar inputs (0 V to +10 V or 0 V to +20 V), while the same pins accept bipolar inputs (±5 V or ±10 V) when BIP OFF is connected to the internal 10 V reference. Input impedance is 5 kΩ for 10 V spans and 10 kΩ for 20 V spans. The device guarantees ±4 LSB bipolar offset error (adjustable to zero) and uses separate trimming networks for unipolar and bipolar zero-centering - all documented in the AD574AJPZ functional specifications.

What is the conversion time of the AD574AJPZ and how is it controlled?

The AD574AJPZ has a maximum conversion time of 35 µs for 12-bit mode and 24 µs for 8-bit mode. Conversion length is selected by the AO pin during the convert command: AO low initiates a full 12-bit cycle; AO high triggers an abbreviated 8-bit cycle. The STS pin transitions high at conversion start and returns low upon completion - providing hardware-ready signaling. These timing values are guaranteed across the full 0°C to +70°C range and independent of supply voltage within specified limits.

Can the AD574AJPZ be interfaced directly to an 8-bit microprocessor bus?

Yes, the AD574AJPZ supports direct 8-bit bus interfacing via its 12/8 pin configuration. When 12/8 is tied to DIGITAL COMMON, the device outputs two 8-bit bytes: AO = 0 enables DB11–DB8 (MSB nibble), and AO = 1 enables DB7–DB0 followed by four trailing zeroes. This eliminates need for external latches or bus transceivers. All digital inputs meet TTL voltage thresholds, and outputs drive 500 µA high / 1.6 mA low - fully compatible with standard 8-bit microcontrollers and peripheral interfaces.