Analog Devices Inc. AD7675ACPZ

Overview

AD7675ACPZ from Analog Devices is a 16-bit, 100 kSPS, fully differential successive approximation register (SAR) analog-to-digital converter operating from a single 5 V supply. It delivers ±1.5 LSB INL, 94 dB typical SNR at 45 kHz, and no missing codes across its ±2.5 V differential input range. It serves as the precision front-end digitizer in high-fidelity data acquisition systems for medical CT scanners and portable instrumentation.

For engineers reviewing the AD7675ACPZ datasheet, AD7675ACPZ pinout, AD7675ACPZ application, or AD7675ACPZ equivalent, key selection criteria include guaranteed 16-bit monotonicity, absence of pipeline delay, dual serial/parallel interface flexibility (SPI/QSPI/MICROWIRE compatible), and validated operation from –40°C to +85°C in LFCSP packaging.

Technical Context

The AD7675ACPZ implements a charge redistribution SAR architecture with on-chip track-and-hold, internal conversion clock, and hardware-calibrated error correction circuitry. Its differential input stage provides 79 dB CMRR at 10 kHz and supports true bipolar signal acquisition without external level-shifting.

It features dual-mode digital interfacing: parallel (8- or 16-bit) with BYTESWAP control, or 2-wire serial (master/slave) with programmable SCLK division (DIVSCLK[1:0]), active-low/high SYNC polarity (INVSYNC), and configurable clock edge alignment (INVSCLK). All digital I/Os are 3 V/5 V logic compatible via independent OVDD supply.

Key Specifications

Pinout & Package

The AD7675ACPZ is housed in a 48-lead Lead Frame Chip Scale Package (LFCSP), measuring 7 mm × 7 mm × 0.85 mm, with exposed thermal pad for enhanced thermal performance in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7675ACPZ, AD7660ASTZ trades speed and resolution for lower cost and power, while AD7676ACPZ retains full compatibility but doubles throughput-making the latter ideal for scalable designs needing headroom, and the former suitable for legacy-replacement cost optimization.

Availability

AD7675ACPZ is available at Aetrix Electronics and suitable for CT scanners, portable medical instruments, precision data acquisition systems, and industrial process control requiring stable component supply over extended production lifecycles.

Supply support for AD7675ACPZ 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, headquartered in Norwood, MA, with design centers worldwide.

The AD7675ACPZ belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered specifically for applications demanding high resolution, low latency, and guaranteed monotonicity in medical, industrial, and test equipment.

FAQ

What is the absolute maximum input voltage range for AD7675ACPZ analog inputs?

The AD7675ACPZ analog inputs (IN+, IN–, REF, REFGND) tolerate voltages from AGND – 0.3 V to AVDD + 0.3 V. Exceeding this range risks permanent damage. For ±2.5 V differential operation, ensure common-mode voltage remains within –0.1 V to +3.0 V relative to AGND, per datasheet specifications. Always observe these limits to maintain reliability of the AD7675ACPZ in field-deployed systems.

Does AD7675ACPZ require an external reference voltage, and what are the acceptable values?

Yes, the AD7675ACPZ requires an external reference voltage applied to the REF pin, with REFGND tied to analog ground. The valid range is 2.3 V to 2.5 V - the device is optimized for 2.5 V references such as the ADR421. Reference current draw is only 35 µA at 100 kSPS, minimizing loading on precision reference circuits used with the AD7675ACPZ.

How does the power-down mode of AD7675ACPZ function, and what is its typical current draw?

The AD7675ACPZ enters power-down mode when the PD pin is driven HIGH, halting conversions and reducing quiescent current. Maximum power-down current is 7 µW - verified across –40°C to +85°C. This ultra-low state enables multi-year battery operation in intermittent-sampling devices using the AD7675ACPZ as their primary digitizer.

Can AD7675ACPZ interface directly with a 3 V microcontroller, and how is this achieved?

Yes, the AD7675ACPZ supports 3 V logic interfacing via its dedicated OVDD supply pin, which accepts 2.7 V to 5.25 V. When OVDD = 3.3 V, all digital outputs (DATA, BUSY, SDOUT, etc.) swing between 0 V and ~2.7 V, matching standard 3 V logic thresholds. This eliminates level-shifters in mixed-voltage systems using the AD7675ACPZ.

Is AD7675ACPZ pin-compatible with any other Analog Devices ADCs, and which ones?

Yes, the AD7675ACPZ is pin-to-pin compatible with the AD7660 in both 48-lead LQFP (ST-48) and LFCSP (CP-48) packages. This allows direct substitution without PCB redesign. It is also compatible with the higher-speed AD7676ACPZ, enabling performance upgrades while retaining mechanical and electrical layout integrity for the AD7675ACPZ footprint.