Analog Devices Inc. AD7677ASTZ

Overview

AD7677ASTZ from Analog Devices is a 16-bit, 1 MSPS, fully differential successive approximation register (SAR) analog-to-digital converter operating from a single 5 V supply. It delivers ±1 LSB integral nonlinearity, 94 dB typical SNR at 45 kHz, and no missing codes across its ±2.5 V input range. It serves high-accuracy data acquisition in medical CT scanners and spectrum analyzers where pipeline-free latency and AC/DC precision are critical.

For engineers reviewing the AD7677ASTZ datasheet, AD7677ASTZ pinout, AD7677ASTZ application, or AD7677ASTZ equivalent, this page provides verified technical context, mode-specific timing behavior, interface flexibility (parallel/serial, 3 V/5 V), real-world INL/DNL distributions, and validated drop-in alternatives for legacy AD7675/AD7676 designs.

Technical Context

The AD7677ASTZ implements a charge redistribution SAR architecture with on-chip track-and-hold, delivering zero pipeline delay and deterministic conversion latency across Warp (1 µs), Normal (1.25 µs), and Impulse (1.5 µs) modes. Its differential input stage achieves 85 dB CMRR at 10 kHz and supports external 2.3–2.5 V references with 37 µA max current draw.

Hardware-calibrated error correction ensures dc accuracy (±1 LSB INL, ±1 LSB DNL) and ac performance (94 dB S/(N+D), –110 dB THD) without post-processing. The dual-domain power system separates AVDD/DGND (analog/digital core) from OVDD (I/O interface), enabling independent 3 V or 5 V logic interfacing while maintaining 115 mW typical dissipation at 1 MSPS.

Key Specifications

Pinout & Package

AD7677ASTZ is housed in a 48-lead LQFP (ST-48) package with exposed pad for thermal management, rated for –40°C to +85°C operation. Pin 1 identifier located at top-left corner per JEDEC standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision SAR ADC applications.

Compared with AD7676ASTZ and AD7675ASTZ, the AD7677ASTZ delivers 25% higher throughput in Warp Mode and 2 dB better SNR, making it optimal for next-generation CT scanners and portable spectrum analyzers where both speed and fidelity are non-negotiable.

Availability

AD7677ASTZ is available at Aetrix Electronics and suitable for CT scanners, spectrum analyzers, and battery-powered medical instruments requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7677ASTZ 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 precision instrumentation, industrial, and healthcare markets since 1965.

The AD7677ASTZ belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered for applications demanding simultaneous high speed, low power, and metrology-grade linearity without pipeline latency.

FAQ

What is the maximum guaranteed throughput rate for AD7677ASTZ?

The AD7677ASTZ achieves a maximum guaranteed throughput of 1 MSPS in Warp Mode, with conversion time of 1 µs and minimum inter-conversion interval of 1 ms to maintain full specified accuracy. In Normal Mode, it delivers 800 kSPS with no minimum timing constraint, and in Impulse Mode, 666 kSPS with power scaled linearly to sample rate. All modes retain ±1 LSB INL and 94 dB S/(N+D) performance.

Does AD7677ASTZ require an external reference voltage?

Yes, the AD7677ASTZ requires an external reference voltage applied to the REF pin, with a specified range of 2.3 V to 2.5 V. It draws up to 37 µA from the reference source at 1 MSPS throughput. The device does not include an internal reference; using a precision 2.5 V reference such as the ADR4525 ensures full-scale accuracy and minimizes gain error drift over temperature.

How does the power consumption of AD7677ASTZ vary across operating modes?

AD7677ASTZ power scales dynamically: 115 mW typical at 1 MSPS (Warp), 98 mW at 666 kSPS (Impulse), and drops to 15 µW at 100 SPS. In power-down mode, consumption is limited to 7 µW maximum. This scalability is achieved via internal clock gating and bias current adjustment, enabling optimization for battery life in portable diagnostics without sacrificing resolution.

Is AD7677ASTZ pin-compatible with earlier AD767x series devices?

Yes, AD7677ASTZ is pin-to-pin compatible with AD7675ASTZ and AD7676ASTZ in the same 48-lead LQFP package (ST-48). Signal routing, power connections, and interface pins match exactly, allowing direct replacement without PCB modification. Firmware updates may be needed to configure Warp Mode timing and updated register settings.

What interface options does AD7677ASTZ support, and how are they selected?

AD7677ASTZ supports parallel (8-bit or 16-bit) and 2-wire serial interfaces via the SER/PAR pin. When SER/PAR = LOW, the 16-bit DATA[15:0] bus operates in parallel mode with RD/CS handshaking. When SER/PAR = HIGH, pins DATA[1:0], DATA[2:3], DATA[4], DATA[5], DATA[6], DATA[7], DATA[21], DATA[22], and DATA[23] become SDOUT, SCLK, SYNC, and control lines for serial communication compatible with both 3 V and 5 V logic levels.