Analog Devices Inc. AD7674ACPZ

Overview

AD7674ACPZ from Analog Devices is an 18-bit, charge redistribution successive approximation register (SAR) analog-to-digital converter with ±2.5 LSB integral nonlinearity, 800 kSPS maximum throughput in warp mode, differential ±V_REF input range up to ±5 V, and single 5 V supply operation. It serves as a high-accuracy, low-latency ADC in precision data acquisition systems requiring no pipeline delay.

For engineers reviewing the AD7674ACPZ datasheet, AD7674ACPZ pinout, AD7674ACPZ application, or AD7674ACPZ equivalent, this page delivers verified specifications, interface configuration options (parallel 18/16/8-bit or SPI/QSPI/MICROWIRE-compatible serial), real-world use cases in medical CT scanners and geophone sensing, and validated alternative parts for design continuity.

Technical Context

The AD7674ACPZ implements a fully differential SAR architecture with on-chip conversion clock, error correction circuits, and dual interface ports-enabling immediate data availability post-conversion without latency. Its switched-capacitor DAC and calibration logic ensure monotonic 18-bit output with no missing codes across −40°C to +85°C.

It supports three distinct conversion modes: warp (800 kSPS, highest speed), normal (666 kSPS, full accuracy at any rate), and impulse (570 kSPS, power scaling proportional to sampling rate). Reference handling includes internal buffer support with REFBUFIN input (2.5 V → 4.096 V output) and external REF input (3 V to 5.1 V).

Key Specifications

Pinout & Package

AD7674ACPZ is available in a 48-lead LFCSP package with exposed pad internally connected to AGND. The package supports fine-pitch PCB layout and enhanced thermal performance (θ_JA = 26°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7674ACPZ, AD7679ACPZ offers pin-compatible upgrade path without impulse mode, while AD7677ACPZ provides identical low-power architecture at reduced maximum speed - enabling tiered product variants from a common design foundation.

Availability

AD7674ACPZ is available at Aetrix Electronics and suitable for CT scanner subsystems, seismic data acquisition nodes, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and guaranteed lot-to-lot consistency.

Supply support for AD7674ACPZ 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, with R&D and manufacturing infrastructure spanning North America, Europe, and Asia.

The AD7674ACPZ belongs to Analog Devices' precision SAR ADC product line, engineered specifically for demanding instrumentation, medical imaging, and geophysical sensing applications where resolution, linearity, and timing fidelity are non-negotiable.

FAQ

What is the maximum sampling rate of the AD7674ACPZ and under what conditions is it achieved?

The AD7674ACPZ achieves a maximum throughput of 800 kSPS in warp mode, which requires WARP = high and IMPULSE = low. This mode delivers the highest speed but mandates a minimum conversion rate to maintain full specified accuracy. At 800 kSPS, the complete conversion cycle is 1.25 µs, and power dissipation is 98 mW typical. The AD7674ACPZ must be operated within its absolute maximum ratings, including AVDD = 5 V ± 5%, to sustain this performance.

Does the AD7674ACPZ require an external voltage reference, or does it include internal reference support?

The AD7674ACPZ supports both external and internal reference configurations. It includes an on-chip reference buffer that generates a precise 4.096 V output when 2.5 V is applied to the REFBUFIN pin. When PDBUF = low, the internal buffer is enabled; when high, the device uses an external reference applied directly to the REF pin (3 V to 5.1 V). This dual-reference capability eliminates the need for external reference ICs in many AD7674ACPZ designs.

How does the AD7674ACPZ handle digital interface selection between parallel and serial modes?

The AD7674ACPZ selects interface mode via MODE1 and MODE0 pins: Mode 0 (00) = 18-bit parallel, Mode 1 (01) = 16-bit parallel, Mode 2 (10) = 8-bit parallel, Mode 3 (11) = serial. In serial mode, SDOUT, SCLK, and SYNC operate as SPI/QSPI/MICROWIRE-compatible signals. The AD7674ACPZ supports both master and slave serial configurations, with EXT/INT and INVSYNC pins configuring clock source and SYNC polarity - all without requiring changes to the AD7674ACPZ's physical layout.

What are the thermal and packaging characteristics of the AD7674ACPZ?

The AD7674ACPZ is offered in a 48-lead LFCSP package with an exposed pad internally connected to AGND. Its thermal performance is characterized by θ_JA = 26°C/W in free air, enabling efficient heat dissipation in compact, high-density layouts. The exposed pad should be soldered to the system's analog ground plane to enhance mechanical reliability and thermal conduction - a requirement explicitly recommended in the AD7674ACPZ datasheet for long-term robustness.

Can the AD7674ACPZ be used in systems requiring simultaneous sampling across multiple channels?

The AD7674ACPZ itself is a single-channel ADC and does not natively support simultaneous sampling with other AD7674ACPZ devices. However, its CNVST input is designed for precise external triggering, and its serial interface supports daisy-chaining via SDIN/SDOUT when EXT/INT = high - enabling synchronized acquisition across multiple AD7674ACPZ units using a common CNVST signal and shared SCLK. This configuration is documented in the AD7674ACPZ datasheet for multichannel data acquisition systems.