Analog Devices Inc. AD7654ASTZRL

Overview

AD7654ASTZRL from Analog Devices is a dual-channel, simultaneous-sampling, 16-bit SAR analog-to-digital converter with 500 kSPS throughput in normal mode, ±3.5 LSB INL, 89 dB SNR at 100 kHz, and 0 V to 5 V unipolar input range-designed for high-precision AC motor control and 3-phase power monitoring systems requiring synchronized voltage/current acquisition.

For engineers reviewing the AD7654ASTZRL datasheet, AD7654ASTZRL pinout, AD7654ASTZRL application, or AD7654ASTZRL equivalent, key selection criteria include simultaneous sampling capability, dual 4-channel multiplexed analog inputs (INA1/INB1 or INA2/INB2), impulse-mode power scaling (2.6 mW at 10 kSPS), SPI/QSPI/MICROWIRE-compatible serial interface, and LQFP-48 package compatibility with industrial temperature range (−40°C to +85°C).

Technical Context

The AD7654ASTZRL integrates two independent track-and-hold amplifiers enabling true simultaneous sampling across two analog channels, each selectable via A0 control to acquire either INA1/INB1 or INA2/INB2 pairs. Its charge redistribution SAR architecture delivers no missing codes over 16 bits with internal error correction and no pipeline delay.

It supports dual interface modes: parallel 16-bit data bus (D[15:0]) with RD/CS/BUSY handshaking, and flexible 2-wire serial operation (SDOUT/SYNC/SCLK) configurable as master or slave, with programmable clock division (DIVSCLK[1:0]), active-low/high SYNC polarity (INVSYNC), and SCLK edge inversion (INVSCLK) for timing alignment.

Key Specifications

Pinout & Package

AD7654ASTZRL is packaged in a 48-lead low-profile quad flat package (LQFP-48), RoHS-compliant, with exposed pad connected to AGND. Pin 1 marked by dot; EPAD not required for specified performance but recommended for thermal stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7655ASTZ, AD7654ASTZRL trades extended temperature rating and marginal SNR improvement for lower unit cost and identical footprint compatibility; versus ADS8588HIPM, it provides faster throughput and smaller package at the expense of channel count and integrated reference - making AD7654ASTZRL the preferred choice for compact, dual-path industrial control nodes.

Availability

AD7654ASTZRL is available at Aetrix Electronics and suitable for AC motor control, 3-phase power monitoring, and energy metering applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial OEM programs.

Supply support for AD7654ASTZRL 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 centers worldwide and ISO 9001-certified manufacturing.

The AD7654ASTZRL belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered specifically for industrial automation, motor control, and power electronics where simultaneous sampling, low latency, and robust serial/parallel interfacing are mandatory.

FAQ

What is the maximum sampling rate of the AD7654ASTZRL in normal mode?

The AD7654ASTZRL achieves a maximum throughput rate of 500 kSPS in normal mode, corresponding to a complete conversion cycle time of 2 μs. This specification is guaranteed over the full industrial temperature range (−40°C to +85°C) with AVDD = DVDD = 5 V and OVDD = 2.7 V to 5.25 V. The AD7654ASTZRL maintains this rate while delivering 16-bit resolution with no missing codes and ±3.5 LSB INL.

Does the AD7654ASTZRL support true differential input configurations?

The AD7654ASTZRL does not implement true differential input architecture; it features pseudo-differential inputs with independent ground-sense pins (INAN, INBN) per channel. Each analog input pair (e.g., INA1/INAN) operates in unipolar 0 V to 5 V mode, referenced to its dedicated ground sense. While it supports common-mode rejection (55 dB at 100 kHz), it lacks fully differential front-end circuitry like the AD7676 or AD7623 - confirming AD7654ASTZRL as a pseudo-differential SAR ADC per Analog Devices' PulSAR® selection table.

Can the AD7654ASTZRL operate with a 3 V digital interface while using a 5 V analog supply?

Yes, the AD7654ASTZRL supports mixed-voltage operation: AVDD and DVDD require 4.75 V to 5.25 V for analog and core digital logic, while OVDD (I/O interface supply) accepts 2.7 V to 5.25 V - enabling direct connection to 3 V microcontrollers or FPGAs. Digital inputs (VIH min = 2.0 V) and outputs (VOH = OVDD − 0.2 V) are fully compatible with 3 V logic levels when OVDD = 3.3 V, as verified in Table 2 and Figure 3 of the Rev. D datasheet.

How does the A0 pin affect analog input selection on the AD7654ASTZRL?

The A0 pin on the AD7654ASTZRL controls the internal analog multiplexer to select between two simultaneous sampling pairs: when A0 = low, INA1 and INB1 are acquired together; when A0 = high, INA2 and INB2 are sampled simultaneously. This hardware-selectable pairing enables flexible signal routing without software reconfiguration, and the selection is latched at the CNVST falling edge - ensuring deterministic channel binding per conversion cycle.

Is the AD7654ASTZRL pin-compatible with other devices in the PulSAR® family?

The AD7654ASTZRL shares the same 48-lead LQFP package footprint and core signal mapping (CNVST, BUSY, RD, CS, D[15:0], etc.) with AD7655ASTZ, enabling drop-in replacement in most layouts. However, it is not pin-compatible with AD7650/AD7652 (44-lead TQFP) or AD7653 (48-lead LFCSP with different pin 1 location and EPAD configuration). Always verify mechanical and thermal constraints before substitution, as AD7654ASTZRL's LQFP variant differs from LFCSP-packaged members.