Analog Devices Inc. AD7654ACPZ

Overview

AD7654ACPZ from Analog Devices is a dual-channel, simultaneous-sampling, 16-bit SAR analog-to-digital converter with 500 kSPS throughput in normal mode and true 0 V to 5 V unipolar input range. It integrates two track-and-hold amplifiers, internal error correction, and both parallel and SPI/QSPI/MICROWIRE-compatible serial interfaces - designed for high-precision AC motor control and 3-phase power monitoring systems.

For engineers reviewing the AD7654ACPZ datasheet, AD7654ACPZ pinout, AD7654ACPZ application, or AD7654ACPZ equivalent, key selection criteria include simultaneous sampling capability, ±3.5 LSB INL, 89 dB SNR at 100 kHz, dual 4-channel multiplexed analog inputs (INA1/INB1 or INA2/INB2), and support for impulse-mode power scaling down to 2.6 mW at 10 kSPS.

Technical Context

The AD7654ACPZ implements a charge redistribution SAR architecture with dual independent track-and-hold circuits enabling true simultaneous sampling across two channels. Its A0 multiplexer control selects between input pairs INA1/INB1 (A0 = low) or INA2/INB2 (A0 = high), while internal calibration circuitry ensures no missing codes over temperature.

It supports three operational modes: normal (500 kSPS, 120 mW), impulse (444 kSPS, 114 mW), and low-throughput impulse (10 kSPS, 2.6 mW), with power dissipation scaling linearly with throughput. The device uses a single 5 V AVDD/DVDD supply and separate OVDD (2.7–5.25 V) for I/O interface compatibility with 3 V or 5 V logic.

Key Specifications

Pinout & Package

AD7654ACPZ is packaged in a 48-lead LQFP (ST-48) with exposed pad grounded per datasheet Figure 4. Pin functions are validated per Table 6 and functional block diagram in Rev. D datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel simultaneous-sampling ADC applications.

Compared with AD7655ASTZ, AD7654ACPZ trades extended temperature range for lower unit cost and identical core performance; compared with AD7656ASTZ, it provides minimal pin count and footprint for applications needing exactly two synchronized channels - reducing PCB layer count and routing complexity.

Availability

AD7654ACPZ is available at Aetrix Electronics and suitable for AC motor control, 3-phase power monitoring, and uninterruptible power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7654ACPZ 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.

The AD7654ACPZ belongs to the PulSAR® family of precision SAR ADCs, engineered specifically for industrial automation, energy metering, and motor control systems demanding simultaneous sampling, low power, and robust noise immunity.

FAQ

What is the maximum sampling rate of the AD7654ACPZ in normal mode?

The AD7654ACPZ achieves a maximum throughput rate of 500 kSPS in normal mode, with a complete conversion cycle time of 2 μs. This specification is guaranteed across the full operating temperature range (−40°C to +85°C) and is measured under standard conditions: AVDD = DVDD = 5 V, OVDD = 2.7 V to 5.25 V, and parallel read interface. The AD7654ACPZ maintains this speed without pipeline delay, delivering deterministic timing for real-time control loops.

Does the AD7654ACPZ support true simultaneous sampling across both channels?

Yes, the AD7654ACPZ features two independent track-and-hold amplifiers that enable true simultaneous sampling of two analog input pairs (INA1/INB1 or INA2/INB2). Aperture delay matching is specified at ≤30 ps, ensuring phase coherence between sampled channels - a requirement verified in the AD7654ACPZ datasheet Rev. D, Table 2 and Functional Block Diagram. This capability is fundamental to its use in vector-controlled motor drives.

What digital interface options does the AD7654ACPZ provide?

The AD7654ACPZ supports both parallel and serial interfaces via the SER/PAR pin. In parallel mode, it outputs 16-bit data on D[0:15] with RD/CS control. In serial mode, it is compatible with SPI®, QSPI™, and MICROWIRE™ protocols using SDOUT, SCLK, and SYNC pins - with configurable polarity (INVSYNC), clock inversion (INVSCLK), and master/slave operation (EXT/INT). All interface timing is fully documented in Table 3 and Figures 30–34 of the AD7654ACPZ datasheet.

Can the AD7654ACPZ operate from a single 5 V supply?

Yes, the AD7654ACPZ operates from a single 5 V supply for AVDD and DVDD, with OVDD supporting 2.7 V to 5.25 V for I/O interface flexibility. The device requires separate analog (AGND), digital (DGND), and I/O (OGND) ground connections as specified in the Absolute Maximum Ratings table and Pin Configuration diagrams. No negative or auxiliary supplies are needed - simplifying power design in space-constrained industrial modules.

What is the analog input voltage range supported by the AD7654ACPZ?

The AD7654ACPZ supports a unipolar analog input voltage range of 0 V to 5 V, referenced to its external voltage reference (2.3 V to AVDD/2). Input common-mode voltage is specified from −0.1 V to +0.5 V relative to INxN, and analog input CMRR is 55 dB at 100 kHz. This range is optimized for direct interfacing with isolated amplifiers and shunt-based current sensing circuits without level-shifting components.