Analog Devices Inc. AD7675ACPRL

Overview

AD7675ACPRL 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 to +2.5 V differential input range. It serves as the precision front-end digitizer in medical CT scanners and portable instrumentation requiring low power and zero pipeline delay.

For engineers reviewing the AD7675ACPRL datasheet, AD7675ACPRL pinout, AD7675ACPRL application, or AD7675ACPRL equivalent, this page provides verified package mapping (48-lead LFCSP), interface timing constraints (e.g., 10 µs minimum conversion cycle), AC/DC accuracy specs, and two validated alternative ADCs for high-fidelity data acquisition systems.

Technical Context

The AD7675ACPRL employs a charge redistribution DAC architecture with internal error correction circuitry, enabling true differential sampling without pipeline latency. Its acquisition time is 8.75 µs, aperture jitter is 5 ps rms, and it supports both straight binary and two's complement output coding via the OB/2C pin.

It integrates dual interface paths: a configurable 16-bit parallel port (with BYTESWAP control) and a SPI/QSPI/MICROWIRE-compatible 2-wire serial interface (SYNC/SCLK/SDOUT), all operable at either 3 V or 5 V logic levels. Power management includes a dedicated PD pin enabling 7 µW max power-down mode.

Key Specifications

Pinout & Package

AD7675ACPRL is housed in a 48-lead frame chip scale package (LFCSP), measuring 7 mm × 7 mm × 0.85 mm, with exposed thermal pad (CP-48 option). Pin numbering follows standard LFCSP orientation with pin 1 marked by dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7675ACPRL, AD7660ASTRL trades resolution and speed for cost reduction, while AD7676ACPRL retains full compatibility but doubles throughput-making the latter ideal for scalable platforms needing minimal redesign effort.

Availability

AD7675ACPRL is available at Aetrix Electronics and suitable for medical imaging, portable instrumentation, and industrial process control requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for AD7675ACPRL 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, founded in 1965 and headquartered in Wilmington, MA.

The AD7675ACPRL belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered specifically for applications demanding high DC accuracy, excellent AC performance, and low power in space-constrained environments.

FAQ

What is the absolute maximum voltage rating for the IN+ and IN– pins of the AD7675ACPRL?

The AD7675ACPRL specifies an absolute maximum analog input voltage range of AVDD + 0.3 V to AGND – 0.3 V for IN+ and IN–. With AVDD = 5 V, this corresponds to –0.3 V to +5.3 V. Exceeding these limits risks permanent damage, even if within the recommended operating range of –2.5 V to +2.5 V differential. The internal ESD diodes provide protection but are not intended for continuous conduction.

Does the AD7675ACPRL require an external reference, and what are the key constraints?

Yes, the AD7675ACPRL requires an external precision reference applied to the REF and REFGND pins. The reference voltage must be between 2.3 V and 2.5 V, with typical operation at 2.5 V. It draws only 35 µA at 100 kSPS, allowing use with low-output-current references like the ADR421. Reference noise and drift directly impact overall system accuracy, so low-noise, low-drift sources are strongly recommended.

How does the BYTESWAP pin affect data alignment on the AD7675ACPRL parallel interface?

When BYTESWAP is LOW, the AD7675ACPRL outputs the least significant byte (LSB) on DATA[7:0] and most significant byte (MSB) on DATA[15:8]. When BYTESWAP is HIGH, the mapping reverses: LSB appears on DATA[15:8] and MSB on DATA[7:0]. This allows direct compatibility with both little-endian and big-endian microcontrollers without software byte-swapping overhead.

Can the AD7675ACPRL operate with a 3 V digital interface while using a 5 V analog supply?

Yes, the AD7675ACPRL supports mixed-voltage operation: AVDD = 5 V for analog circuitry, while OVDD can be set to 3 V to interface with 3 V logic families. DVDD may also be operated at 3 V if the digital core is compatible. All digital inputs (CS, RD, CNVST, etc.) accept 3 V logic levels, and outputs (DATA, BUSY, SDOUT) are level-shifted to match OVDD, ensuring robust communication without level translators.

What is the significance of the "no missing codes" specification for the AD7675ACPRL?

The AD7675ACPRL guarantees no missing codes across its full 16-bit range - meaning every integer value from 0 to 65,535 appears at least once during a monotonic ramp test. This is essential for open-loop measurements and control systems where code gaps would introduce nonlinearity or dead zones. It results directly from the ±1.5 LSB INL limit and charge redistribution architecture, verified across temperature and supply variations.