Analog Devices Inc. AD7667ASTZRL

Overview

AD7667ASTZRL from Analog Devices is a 16-bit, 1 MSPS charge redistribution SAR analog-to-digital converter with integrated 2.5 V reference, unipolar 0 V to 2.5 V input range, and dual serial/parallel interface. It operates from a single 5 V supply and delivers ±2.0 LSB INL, 88 dB S/(N+D) at 20 kHz, and no missing codes-enabling high-accuracy data acquisition in medical instruments and battery-powered systems.

For engineers reviewing the AD7667ASTZRL datasheet, AD7667ASTZRL pinout, AD7667ASTZRL application, or AD7667ASTZRL equivalent, this page provides verified technical context, mode-specific throughput timing (Warp/Normal/Impulse), real-world interface compatibility (SPI/QSPI/MICROWIRE/DSP), internal reference drift (±15 ppm/°C max), and package-specific layout guidance for the 48-lead LQFP variant.

Technical Context

The AD7667ASTZRL implements a hardware-calibrated charge redistribution SAR architecture with on-chip error correction, eliminating pipeline delay and supporting three deterministic conversion modes: Warp (1 µs cycle, 1 MSPS), Normal (1.25 µs, 800 kSPS), and Impulse (1.5 µs, 666 kSPS with throughput-scaled power). Its internal 2.5 V reference exhibits ±15 ppm/°C max drift and supports external reference override via PDREF/PDBUF control.

Interface flexibility includes parallel 16-bit data bus with RD/CS/BUSY handshaking and 2-wire serial operation compatible with SPI/QSPI/MICROWIRE protocols-configurable via SER/PAR, OB/2C, and clock polarity/inversion pins (INVSCLK, INVSYNC). All digital I/O supports both 3 V and 5 V logic levels with defined VIH/VIL thresholds and load-dependent timing.

Key Specifications

Pinout & Package

The AD7667ASTZRL is housed in a 48-lead LQFP (ST-48) package with exposed pad, pin-compatible with AD7671 and AD7677. Thermal resistance θ_JA = 91°C/W enables operation up to +85°C ambient without forced airflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with AD7671ASTZ and AD7664ASTZ, the AD7667ASTZRL uniquely balances 1 MSPS unipolar acquisition, integrated low-drift reference, and hardware-mode selection-making it optimal for portable medical devices requiring both speed and battery efficiency without bipolar input overhead.

Availability

AD7667ASTZRL is available at Aetrix Electronics and suitable for medical instrumentation, battery-powered data loggers, and process control sensors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7667ASTZRL 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 AD7667ASTZRL belongs to the PulSAR® family of precision SAR ADCs designed specifically for high-throughput, low-latency data acquisition in space-constrained, power-sensitive applications where accuracy and reliability are non-negotiable.

FAQ

What is the maximum guaranteed integral nonlinearity (INL) for the AD7667ASTZRL?

The AD7667ASTZRL has a maximum guaranteed integral nonlinearity of ±2.0 LSB across its full operating temperature range (–40°C to +85°C). This specification ensures consistent measurement accuracy for precision applications such as medical diagnostics and process control. The AD7667ASTZRL achieves this performance through factory calibration and on-chip error correction circuitry, eliminating the need for system-level INL compensation.

Does the AD7667ASTZRL support both serial and parallel digital interfaces?

Yes, the AD7667ASTZRL supports both parallel and serial interfaces via the SER/PAR pin. In parallel mode, it outputs 16-bit data on D[0:15] with RD/CS/BUSY handshaking. In serial mode, it operates as SPI/QSPI/MICROWIRE-compatible master or slave using SDOUT/SCLK/SYNC signals. The AD7667ASTZRL's interface is voltage-flexible-OVDD accepts 2.7 V to 5.25 V-allowing direct connection to 3 V or 5 V host processors without level translation.

How does the AD7667ASTZRL manage power consumption across different sampling rates?

The AD7667ASTZRL scales power with throughput using three hardware-selectable modes: Warp (1 MSPS, 133 mW with REF), Normal (800 kSPS), and Impulse (666 kSPS, 87 mW with REF). At 1 kSPS in Impulse mode without reference, power drops to 130 µW. This behavior is implemented in analog circuitry-not firmware-so the AD7667ASTZRL automatically adjusts bias currents and clock gating based on WARP/IMPULSE pin states, enabling predictable energy-per-sample optimization.

Can the AD7667ASTZRL use an external reference instead of its internal 2.5 V reference?

Yes, the AD7667ASTZRL supports external reference operation via the PDREF and PDBUF pins. When PDREF is HIGH, the internal reference is disabled; when PDBUF is LOW, the internal buffer can condition an external reference applied to REFBUFIN. The AD7667ASTZRL accepts external references from 2.3 V to AVDD – 1.85 V (i.e., up to 3.15 V at AVDD = 5 V), allowing integration with ultra-low-drift external references for metrology-grade systems where the AD7667ASTZRL's ±15 ppm/°C internal drift is insufficient.

What package type and pin count does the AD7667ASTZRL use?

The AD7667ASTZRL uses a 48-lead LQFP (ST-48) package with exposed thermal pad, as indicated by the "ASTZ" suffix in the part number. It is pin-to-pin compatible with AD7671 and AD7677, enabling drop-in upgrades in existing layouts. The AD7667ASTZRL's LQFP footprint supports standard reflow profiles and provides accessible pins for probing critical signals including CNVST, BUSY, and REF-facilitating validation and debug in prototype systems.