Analog Devices Inc. AD7676ACPZ

Overview

AD7676ACPZ from Analog Devices is a 16-bit, 500 kSPS, fully differential successive-approximation register (SAR) ADC operating from a single 5 V supply. It delivers ±1 LSB INL, 94 dB SNR at 45 kHz, –110 dB THD, 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 requiring zero pipeline delay and dual serial/parallel interface flexibility.

For engineers reviewing the AD7676ACPZ datasheet, AD7676ACPZ pinout, AD7676ACPZ application, or AD7676ACPZ equivalent, key selection considerations include its true differential architecture, 48-lead LFCSP package, 500 kSPS throughput with 2 µs conversion cycle, SPI/QSPI/MICROWIRE compatibility, and factory-calibrated DC/AC performance over –40°C to +85°C.

Technical Context

The AD7676ACPZ implements a charge redistribution SAR architecture with an integrated track-and-hold, internal conversion clock, and error correction circuitry - eliminating pipeline latency and enabling deterministic timing for multiplexed channel systems. Its differential input stage provides 79 dB CMRR at 10 kHz and supports both straight binary and twos complement output coding via the OB/2C pin.

It features dual interface modes: 16-bit parallel (with BYTESWAP control) or 2-wire serial (master/slave), configurable via SER/PAR, EXT/INT, and INVSYNC pins. Power management includes a dedicated PD pin enabling 7 µW max power-down mode, while OVDD supports 2.7 V to 5.25 V logic-level interfacing independent of DVDD/AVDD.

Key Specifications

Pinout & Package

AD7676ACPZ is housed in a 48-lead Lead Frame Chip Scale Package (LFCSP), measuring 7 mm × 7 mm × 0.85 mm, with exposed paddle for thermal enhancement and RoHS-compliant finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7676ACPZ, AD7675ACPZ offers identical form-factor and calibration but trades 100 kSPS speed for lower cost, while ADS8860IRGET sacrifices parallel interface and package compatibility to gain 2× throughput and 30% smaller footprint - making AD7676ACPZ optimal for balanced speed, interface flexibility, and thermal performance in industrial DAQ.

Availability

AD7676ACPZ is available at Aetrix Electronics and suitable for CT scanners, portable medical instruments, and high-channel-count data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7676ACPZ 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 design and manufacturing expertise spanning precision converters, amplifiers, and RF solutions.

The AD7676ACPZ belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered specifically for high-speed, high-accuracy industrial and medical instrumentation where DC integrity, AC fidelity, and deterministic timing are non-negotiable.

FAQ

What is the maximum sampling rate supported by the AD7676ACPZ?

The AD7676ACPZ supports a maximum throughput rate of 500 kSPS with a complete conversion cycle time of 2 µs. This is achieved using its internal conversion clock and charge redistribution SAR architecture. At this rate, the device consumes 67 mW typical power and maintains ±1 LSB INL and 94 dB SNR. The AD7676ACPZ does not support oversampling or interpolation to increase effective sample rate beyond 500 kSPS.

Does the AD7676ACPZ require an external reference voltage?

Yes, the AD7676ACPZ requires an external precision reference voltage applied to the REF pin, with REFGND as its return path. It accepts 2.3 V to (AVDD – 1.85 V), typically 2.5 V, and draws 170 µA at 500 kSPS. The AD7676ACPZ does not include an internal reference; recommended companions include the ADR421 (2.5 V, low-drift) or ADR431, both of which meet the device's noise and stability requirements.

Is the AD7676ACPZ pin-to-pin compatible with other devices in the PulSAR family?

Yes, the AD7676ACPZ is explicitly specified as pin-to-pin compatible with the AD7675ACPZ in both 48-lead LQFP and LFCSP packages. This includes identical pin functions, power sequencing, and interface timing. However, it is not pin-compatible with AD7677 or AD7671 - those variants differ in pin assignments for serial clocking and power domains, as confirmed in the AD7676 datasheet Table I and Pin Configuration diagram.

What digital interface options does the AD7676ACPZ support?

The AD7676ACPZ supports both parallel and serial interfaces selected via the SER/PAR pin. In parallel mode, it outputs 16-bit data on D[15:0] with RD/CS handshaking. In serial mode, it operates as SPI/QSPI/MICROWIRE/DSP-compatible master or slave using SDOUT, SCLK, and SYNC. The OB/2C pin selects straight binary or twos complement output coding, and BYTESWAP controls byte ordering - all configurable without firmware changes.

How does the power-down mode function on the AD7676ACPZ?

The AD7676ACPZ enters power-down mode when the PD pin is driven HIGH, reducing total supply current to ≤7 µW. Conversions are inhibited after the current one completes, and digital outputs enter high-impedance state. AVDD, DVDD, and OVDD supplies remain active but quiescent. Recovery time is negligible - conversion resumes on first valid CNVST edge after PD returns LOW. This mode is validated down to 100 SPS operation, where typical dissipation drops to 15 µW.