Analog Devices Inc. AD7671ASTZRL

Overview

AD7671ASTZRL from Analog Devices is a 16-bit, 1 MSPS charge redistribution SAR analog-to-digital converter operating from a single 5 V supply. It delivers ±2.5 LSB max INL, 90 dB SNR at 250 kHz, and supports bipolar (±10 V, ±5 V, ±2.5 V) and unipolar (0–10 V, 0–5 V, 0–2.5 V) input ranges. It serves as the high-speed precision front-end in data acquisition systems requiring no pipeline delay and simultaneous serial/parallel interfacing.

For engineers reviewing the AD7671ASTZRL datasheet, AD7671ASTZRL pinout, AD7671ASTZRL application, or AD7671ASTZRL equivalent, key selection criteria include Warp/Normal/Impulse mode throughput trade-offs, 48-lead LQFP package compatibility, 16-bit no-missing-codes performance, and SPI/QSPI/MICROWIRE™-compatible serial interface timing with dual-voltage (3 V/5 V) I/O support.

Technical Context

The AD7671ASTZRL implements a factory-calibrated charge redistribution SAR architecture with integrated resistor input scaler enabling programmable analog input ranges. Its conversion core uses an internal switched-capacitor DAC and error correction circuitry to achieve 2.5 LSB max INL and no missing codes across temperature (–40°C to +85°C).

It supports three hardware-selectable operating modes: Warp Mode (1 MSPS, requires ≤1 ms inter-conversion interval for full accuracy), Normal Mode (800 kSPS, no timing constraints), and Impulse Mode (666 kSPS, power scaled linearly with throughput). Interface flexibility includes parallel (8-/16-bit) and 2-wire serial (SPI/QSPI/MICROWIRE™/DSP-compatible) ports with OVDD-supplied I/O logic level independence.

Key Specifications

Pinout & Package

AD7671ASTZRL is packaged in a 48-lead LQFP (ST-48) with exposed paddle connected to AGND. Pin functions are validated per Analog Devices' official pin function description table and functional block diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7665ASTZ, AD7671ASTZRL adds Warp Mode for 25% higher throughput and Impulse Mode for adaptive power scaling; compared with ADS8860IPWR, it retains parallel interface, bipolar input capability, and hardware mode selection-critical for industrial DAQ and test equipment where configurability and signal range versatility are mandatory.

Availability

AD7671ASTZRL is available at Aetrix Electronics and suitable for data acquisition, communications test equipment, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7671ASTZRL 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, headquartered in Norwood, MA.

The AD7671ASTZRL belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for high-speed, low-latency, multi-range data acquisition in industrial, medical, and test & measurement systems.

FAQ

What are the supported analog input voltage ranges for AD7671ASTZRL?

AD7671ASTZRL supports bipolar ranges of ±10 V, ±5 V, and ±2.5 V, and unipolar ranges of 0–10 V, 0–5 V, and 0–2.5 V. These are selected via external resistor connections to INA(R), INB(2R), INC(4R), and IND(4R) pins per Table I in the datasheet. The internal resistive scaler ensures the DAC input remains at 0–2.5 V regardless of range, preserving linearity and accuracy across all configurations. AD7671ASTZRL does not require external op-amps or level shifters for range switching.

How does Warp Mode differ from Normal Mode in AD7671ASTZRL operation?

Warp Mode enables 1 MSPS throughput but requires inter-conversion intervals ≤1 ms to guarantee full specified accuracy-including ±2.5 LSB INL and 90 dB S/(N+D). If the interval exceeds 1 ms (e.g., after power-up), the first conversion must be discarded. Normal Mode delivers 800 kSPS with no timing constraints, maintaining full accuracy regardless of trigger spacing. AD7671ASTZRL uses dedicated WARP and IMPULSE pins for hardware-selectable mode configuration without register writes.

Can AD7671ASTZRL interface directly with a 3 V microcontroller?

Yes, AD7671ASTZRL supports direct interfacing with 3 V logic through its OVDD pin, which supplies the digital I/O buffers. When OVDD is set to 3 V, all digital outputs (D[0:15], BUSY, SYNC, SDOUT) meet 3 V logic thresholds, and inputs (CS, RD, CNVST, SER/PAR) accept 3 V-compatible levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V). No level-shifting circuitry is required. AD7671ASTZRL maintains full AC/DC specifications across OVDD = 2.7–5.25 V.

What is the purpose of the IMPULSE pin on AD7671ASTZRL?

The IMPULSE pin on AD7671ASTZRL selects a reduced-power operating mode where power dissipation scales linearly with throughput. When IMPULSE = HIGH and WARP = LOW, AD7671ASTZRL achieves 666 kSPS maximum rate and draws only 15 mW at 100 SPS-ideal for battery-powered applications like portable ECG monitors. Power-down current drops to 7 µA. This mode preserves 16-bit resolution and no-missing-codes performance while eliminating software-controlled sleep states or clock gating complexity.

Is AD7671ASTZRL pin-compatible with earlier Analog Devices ADCs?

Yes, AD7671ASTZRL is pin-to-pin compatible with AD7665ASTZ and AD7664ASTZ in the 48-lead LQFP package. All share identical pin numbering, power pin locations (AVDD, DVDD, AGND, DGND), and core interface signals (CNVST, BUSY, CS, RD, D[0:15]). This allows drop-in replacement to upgrade throughput from 800 kSPS to 1 MSPS and add Impulse Mode power scaling without PCB redesign. Functional differences (e.g., WARP/IMPULSE pins) are backward-compatible-unused pins can be tied LOW.