Analog Devices Inc. AD1674ARZ

Overview

AD1674ARZ from Analog Devices is a complete monolithic 12-bit, 100 kSPS analog-to-digital converter with integrated sample-and-hold amplifier (SHA), on-chip 10 V reference, and three-state parallel digital interface. It supports unipolar (0 V–10 V, 0 V–20 V) and bipolar (±5 V, ±10 V) input ranges, operates on ±12 V/±15 V analog and +5 V logic supplies, and delivers ±1 LSB integral nonlinearity at 25°C - used in precision data acquisition systems for industrial process control and automated test equipment.

For engineers reviewing the AD1674ARZ datasheet, AD1674ARZ pinout, AD1674ARZ application, or AD1674ARZ equivalent, this page provides verified technical context, confirmed pin functions, real-world timing behavior in full-control and stand-alone modes, and validated alternative options for 12-bit SAR ADC replacement in embedded measurement systems.

Technical Context

The AD1674ARZ implements a successive approximation register (SAR) architecture with an integrated SHA that supports full Nyquist bandwidth operation up to 1 MHz, enabling accurate digitization of signals without external hold circuitry. Its internal 12-bit current-output DAC and laser-trimmed scaling resistors deliver calibrated input ranges and eliminate need for external gain/offset adjustment in most configurations.

It features dual-mode digital interface: full-control mode (using CE, CS, R/C, A0, 12/8) for multiplexed microprocessor buses, and stand-alone mode (R/C edge-triggered, CE/12/8 fixed) optimized for low-aperture-jitter timing. The device guarantees no missing codes and specifies both DC parameters (e.g., ±1 LSB INL, ±6 LSB bipolar offset) and AC performance (70 dB S/(N+D), –90 dB THD).

Key Specifications

Pinout & Package

AD1674ARZ is supplied in a 28-lead plastic SOIC package (R-28), RoHS-compliant, with 1.27 mm pitch and standard JEDEC MS-013 outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7892BRZ and MAX197BCPP+, the AD1674ARZ uniquely integrates SHA, 10 V reference, and calibrated input scaling - reducing external component count by ≥5 parts and eliminating trim potentiometers, making it ideal for cost-sensitive, high-reliability industrial DAQ where layout simplicity and long-term stability are prioritized.

Availability

AD1674ARZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and medical instrumentation requiring stable component supply, extended temperature operation, and long-lifecycle support.

Supply support for AD1674ARZ 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 DSP ICs, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD1674 product line was designed as a pin-compatible, enhanced-performance successor to the AD574A/AD674A - delivering integrated sampling, improved AC specs, and simplified system integration for precision data acquisition.

FAQ

What is the operating temperature range for the AD1674ARZ?

The AD1674ARZ is rated for operation from –40°C to +85°C (A-grade). This industrial temperature range ensures reliable performance in factory automation, motor control, and outdoor instrumentation environments where ambient conditions exceed commercial limits. The device maintains specified INL (±1 LSB), S/(N+D) (70 dB), and full-scale error (0.1% FSR) across this full range without derating.

Does the AD1674ARZ require external calibration components?

No, the AD1674ARZ does not require external calibration components under typical use. It features factory-laser-trimmed scaling resistors and offset networks supporting four input ranges (±5 V, ±10 V, 0–10 V, 0–20 V) with guaranteed ±1 LSB INL and ±6 LSB bipolar offset at 25°C. Fine-tuning is optional and only needed for sub-LSB accuracy in metrology-grade applications.

How does the AD1674ARZ handle unipolar versus bipolar input configurations?

The AD1674ARZ switches between unipolar and bipolar modes via the BIP OFF pin: connect BIP OFF through a 50 Ω resistor to REF OUT for ±5 V or ±10 V operation; tie BIP OFF to AGND for 0–10 V or 0–20 V unipolar mode. Internal resistor networks automatically scale input impedance (3–7 kΩ for 10 V span, 6–14 kΩ for 20 V span) to maintain 1 mA DAC full-scale current.

Can the AD1674ARZ interface directly with an 8-bit microcontroller bus?

Yes, the AD1674ARZ supports direct 8-bit bus interfacing using its 12/8 and A0 pins. With 12/8 = LOW, the device outputs two 8-bit bytes: A0 = LOW enables DB11–DB4 (upper byte), and A0 = HIGH enables DB3–DB0 (lower byte padded with four zeros). This eliminates need for external latches or transceivers when connecting to 8051, PIC18, or legacy Z80 systems.

What is the purpose of the STS pin on the AD1674ARZ?

The STS (Status) pin on the AD1674ARZ is an active-high open-drain output indicating conversion progress: STS goes HIGH within 200 ns after R/C or CE assertion and returns LOW 1 µs after data becomes valid. It enables polling or interrupt-driven data reads - critical for deterministic timing in real-time control loops and synchronized multi-channel acquisition systems.