Analog Devices Inc. AD7654ACPZRL

Overview

AD7654ACPZRL from Analog Devices is a dual-channel, simultaneous-sampling, 16-bit SAR analog-to-digital converter with 500 kSPS throughput in normal mode and 444 kSPS in impulse mode. It features two independent track-and-hold amplifiers, ±3.5 LSB INL, 89 dB SNR at 100 kHz, and operates from a single 5 V supply. It is used in precision industrial data acquisition systems requiring synchronized voltage measurements across multiple phases.

For engineers reviewing the AD7654ACPZRL datasheet, AD7654ACPZRL pinout, AD7654ACPZRL application, or AD7654ACPZRL equivalent, key selection criteria include simultaneous sampling capability, dual 4-channel multiplexed input architecture, SPI/QSPI/MICROWIRE-compatible serial interface, parallel 16-bit bus support, and impulse-mode power scaling for variable throughput designs.

Technical Context

The AD7654ACPZRL implements a charge redistribution SAR architecture with internal error correction and dual independent track-and-hold circuits enabling true simultaneous sampling of two channel pairs (INA1/INB1 or INA2/INB2) selected via A0. Its conversion logic supports both normal and impulse modes, where power scales linearly with throughput.

It integrates dual 4:1 analog input multiplexers per channel, configurable reference inputs (REFA/REFB), and a flexible digital interface supporting parallel 16-bit output or 2-wire serial operation (master/slave, internal/external clock, active-high/active-low SYNC). The BUSY and EOC signals provide precise timing control for real-time system synchronization.

Key Specifications

Pinout & Package

AD7654ACPZRL is packaged in a 48-lead LFCSP (Lead Frame Chip Scale Package) with exposed pad grounded. Pin functions are electrically identical to the LQFP variant but optimized for thermal performance and board space efficiency.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7655ASTZ, AD7654ACPZRL trades slightly higher power for superior thermal performance in compact layouts; versus ADS8588SIPM, it delivers adequate linearity at lower system-level cost and design complexity by eliminating dual-supply generation.

Availability

AD7654ACPZRL is available at Aetrix Electronics and suitable for AC motor control, 3-phase power monitoring, and uninterruptible power supply designs requiring stable component supply across multi-year industrial product lifecycles.

Supply support for AD7654ACPZRL 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 AD7654ACPZRL belongs to the PulSAR® family of precision SAR ADCs designed specifically for industrial automation, energy metering, and motor control applications demanding simultaneous sampling, low latency, and robust noise immunity.

FAQ

What is the maximum sampling rate of the AD7654ACPZRL in normal mode?

The AD7654ACPZRL achieves a maximum throughput of 500 kSPS in normal mode, corresponding to a complete conversion cycle time of 2 μs. This specification is guaranteed over the full operating temperature range (−40°C to +85°C) with AVDD = DVDD = 5 V and OVDD = 2.7 V to 5.25 V. The AD7654ACPZRL maintains this rate without pipeline delay, delivering fully settled 16-bit results immediately after BUSY goes low.

Does the AD7654ACPZRL support true differential input configurations?

No, the AD7654ACPZRL does not support true differential inputs. It accepts pseudo-differential inputs via independent channel pairs (INA1/INAN, INA2/INAN, INB1/INBN, INB2/INBN) with common-mode voltage range of −0.1 V to +0.5 V relative to each INxN pin. Each channel uses a dedicated track-and-hold amplifier referenced to its own ground sense, enabling high common-mode rejection (55 dB at 100 kHz), but it lacks fully differential front-end circuitry like the AD7676 or AD7677.

How does the IMPULSE pin affect power consumption in the AD7654ACPZRL?

When the IMPULSE pin is driven high, the AD7654ACPZRL enters reduced-power mode, lowering throughput to 444 kSPS and scaling power dissipation proportionally - e.g., 114 mW at 444 kSPS and 2.6 mW at 10 kSPS. This mode dynamically adjusts internal clock frequency and bias currents while preserving 16-bit resolution and ±3.5 LSB INL. The AD7654ACPZRL exits impulse mode automatically upon IMPULSE going low, resuming full 500 kSPS operation.

Can the AD7654ACPZRL interface directly with a 3.3 V microcontroller in serial mode?

Yes, the AD7654ACPZRL supports 3.3 V logic levels in serial mode via its OVDD supply pin, which accepts 2.7 V to 5.25 V. When OVDD = 3.3 V, all serial interface pins (SDOUT, SCLK, SYNC) operate at 3.3 V logic thresholds, and VIH/VIL specifications align with standard 3.3 V CMOS. The AD7654ACPZRL maintains full functionality including master/slave configuration, clock inversion, and SYNC polarity control without level-shifting components.

What is the purpose of the BYTESWAP pin on the AD7654ACPZRL?

The BYTESWAP pin on the AD7654ACPZRL controls byte ordering of the 16-bit parallel output: when low, D[7:0] carries the LSB and D[15:8] the MSB; when high, D[7:0] carries the MSB and D[15:8] the LSB. This hardware-configurable setting eliminates software byte-reversal overhead in microcontrollers with mismatched endianness, ensuring direct memory-mapped reads align with processor expectations. The AD7654ACPZRL retains correct data alignment regardless of BYTESWAP state in serial mode.