Analog Devices Inc. AD7656ABSTZ-RL

Overview

AD7656ABSTZ-RL from Analog Devices is a 16-bit, 250 kSPS simultaneous-sampling analog-to-digital converter with six independent SAR ADC cores, true bipolar ±10 V/±5 V input ranges, on-chip 2.5 V reference, and parallel/serial/daisy-chain interface modes - deployed in power line monitoring and multi-axis industrial control systems.

For engineers reviewing the AD7656ABSTZ-RL datasheet, AD7656ABSTZ-RL pinout, AD7656ABSTZ-RL application, or AD7656ABSTZ-RL equivalent, this page delivers verified specifications, validated pin functions, confirmed interface timing, real-world application context, and two rigorously cross-checked alternative parts for system-level design continuity.

Technical Context

The AD7656ABSTZ-RL integrates six independent 16-bit successive approximation register (SAR) ADCs on a single iCMOS® die, enabling true simultaneous sampling across all six channels via three dedicated CONVST inputs (A/B/C), each controlling a pair of inputs (V1/V2, V3/V4, V5/V6). Its track-and-hold bandwidth is 12 MHz, supporting input frequencies up to 100 kHz with −100 dB channel-to-channel isolation.

It supports dual analog input ranges (±4 × VREF or ±2 × VREF) selected by the RANGE pin or software control register, operates with AVCC/DVCC = 4.75–5.25 V, VDD = 6–16.5 V, VSS = −6 to −16.5 V, and features internal reference buffering with 25 ppm/°C temperature coefficient and 150 ppm long-term stability.

Key Specifications

Pinout & Package

AD7656ABSTZ-RL is housed in a 64-lead LQFP (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are validated per Analog Devices AD7656A datasheet Rev. 0, Figure 3 and Table 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7656ABSTZ-RL, AD7656BSTZ-RL provides extended thermal robustness without interface or timing changes, while LTC2358-16IUK#PBF trades simultaneous sampling for integrated signal conditioning and higher channel density - making it suitable for non-critical timing applications where board space is constrained.

Availability

AD7656ABSTZ-RL is available at Aetrix Electronics and suitable for power line monitoring, industrial motor control, and multi-axis positioning systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7656ABSTZ-RL 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 R&D and manufacturing operations worldwide.

The AD7656A family was designed specifically for high-accuracy, multichannel data acquisition in electric utility, factory automation, and test equipment - prioritizing simultaneous sampling integrity, bipolar input flexibility, and robust industrial supply sequencing.

FAQ

What is the maximum analog input frequency supported by the AD7656ABSTZ-RL?

The AD7656ABSTZ-RL features a 12 MHz full-power bandwidth (−3 dB point) and maintains −0.1 dB flatness up to 2 MHz, enabling accurate digitization of signals up to 100 kHz with −100 dB channel-to-channel isolation. This makes the AD7656ABSTZ-RL suitable for high-fidelity power quality analysis and motor current waveform capture without external anti-aliasing filters.

Does the AD7656ABSTZ-RL require an external reference, or does it include an internal one?

The AD7656ABSTZ-RL includes a precision 2.5 V on-chip reference with ±1% initial accuracy (2.49–2.51 V), 25 ppm/°C temperature coefficient, and 150 ppm long-term stability. The REFIN/REFOUT pin allows direct use of this reference or connection of an external reference; internal reference is enabled by default unless disabled via the WR/REFEN/DIS pin in hardware mode.

Can the AD7656ABSTZ-RL perform true simultaneous sampling across all six channels?

Yes - the AD7656ABSTZ-RL achieves true simultaneous sampling using three dedicated CONVST inputs (A/B/C), each initiating conversion on a pair of channels (V1/V2, V3/V4, V5/V6). Aperture delay matching is specified at 4 ns, ensuring phase coherence critical for vector calculations in power and motion control systems.

What are the power supply requirements for the AD7656ABSTZ-RL in ±10 V input range mode?

In ±10 V (±4 × VREF) mode, the AD7656ABSTZ-RL requires VDD = +11 V to +16.5 V and VSS = −11 V to −16.5 V, along with AVCC/DVCC = 4.75–5.25 V and VDRIVE = 2.7–5.25 V. Power supply sequencing mandates simultaneous VDD/VSS ramp-up; if not possible, VDD must rise before VSS to prevent latch-up.

How does the serial interface of the AD7656ABSTZ-RL support multiple devices?

The AD7656ABSTZ-RL supports daisy-chain configuration in serial mode: when DCEN = 1 and SER/PAR/SEL = 1, DB5/DCIN A, DB4/DCIN B, and DB3/DCIN C accept serial data from upstream devices, while DB10/DOUT C, DB9/DOUT B, and DB8/DOUT A drive downstream devices - enabling up to 16-channel expansion with one SPI master and minimal PCB routing.