Analog Devices Inc. AD7655SCP-EP-RL

Overview

AD7655SCP-EP-RL from Analog Devices is a 4-channel, 16-bit, 1 MSPS simultaneous-sampling SAR ADC with dual track-and-hold amplifiers, single 5 V supply operation, and parallel/serial (SPI/QSPI/MICROWIRE/DSP-compatible) interface - used in high-precision, multichannel data acquisition for AC motor control and 3-phase power systems.

For engineers reviewing the AD7655SCP-EP-RL datasheet, AD7655SCP-EP-RL pinout, AD7655SCP-EP-RL application, or AD7655SCP-EP-RL equivalent, key selection factors include military-grade temperature range (−55°C to +125°C), impulse mode power scaling (2.6 mW at 10 kSPS), 48-lead LFCSP package (CP-48-1), and true simultaneous sampling of two differential channel pairs via A0-controlled multiplexer.

Technical Context

The AD7655SCP-EP-RL implements charge redistribution SAR architecture with internal conversion clock and error correction circuitry. It integrates two independent wide-bandwidth track-and-hold amplifiers feeding a shared 16-bit ADC core, enabling true simultaneous sampling across two differential input pairs (INA1/INB1 or INA2/INB2) selected by A0.

It supports dual operating modes: normal mode (1 MSPS, 120 mW) and impulse mode (888 kSPS, scalable power down to 2.6 mW). Interface flexibility includes 16-bit parallel bus or 2-wire serial (master/slave) with configurable SYNC polarity, SCLK inversion, and byte-swapping - all compatible with 3 V or 5 V logic levels.

Key Specifications

Pinout & Package

AD7655SCP-EP-RL uses a 48-lead Lead Frame Chip Scale Package (LFCSP), CP-48-1 variant: 7 mm × 7 mm body, 0.85 mm height, exposed thermal pad connected to AGND (optional for performance).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7654-EP, AD7655SCP-EP-RL adds 2 extra analog input channels and A0 multiplexing for flexible dual-pair acquisition, while retaining pin compatibility. Versus AD7655BCPZ-RL7, it provides guaranteed operation across −55°C to +125°C with full EP documentation traceability - critical for mission-critical deployments.

Availability

AD7655SCP-EP-RL is available at Aetrix Electronics and suitable for AC motor control, 3-phase power monitoring, and uninterruptible power supplies requiring stable component supply across extended temperature and long lifecycle commitments.

Supply support for AD7655SCP-EP-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.

The AD7655-EP belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for high-speed, multichannel data acquisition in defense, aerospace, and industrial systems demanding extended temperature operation and enhanced reliability.

FAQ

What is the operating temperature range of the AD7655SCP-EP-RL?

The AD7655SCP-EP-RL is rated for continuous operation from −55°C to +125°C. This military-grade temperature range is validated per AQEC standards and supported by controlled manufacturing baseline, product change notification, and qualification data available on request - making it suitable for avionics, downhole tools, and engine control units where ambient extremes are routine.

Does the AD7655SCP-EP-RL support true simultaneous sampling across all four channels?

No - the AD7655SCP-EP-RL performs true simultaneous sampling across two differential channels per conversion cycle (e.g., INA1/INB1 or INA2/INB2), selected by the A0 pin. Its architecture uses two track-and-hold amplifiers feeding a shared 16-bit SAR core, enabling 4-channel acquisition via time-multiplexed pair selection rather than four independent samplers.

How does impulse mode reduce power consumption in the AD7655SCP-EP-RL?

In impulse mode (IMPULSE = HIGH), the AD7655SCP-EP-RL scales power dissipation proportionally with throughput: 2.6 mW at 10 kSPS, 114 mW at 888 kSPS. This is achieved by dynamically gating internal clock and bias circuits between conversions - unlike normal mode's fixed 120 mW draw - allowing significant energy savings in burst-mode or event-triggered acquisition.

Is the AD7655SCP-EP-RL pin-compatible with any other Analog Devices ADCs?

Yes - the AD7655SCP-EP-RL is pin-to-pin compatible with the AD7654-EP. Both share identical 48-lead LFCSP (CP-48-1) packaging, power pin assignments, interface signaling (SER/PAR, RD, CS), and control logic (CNVST, RESET, PD), enabling hardware reuse when upgrading from dual- to quad-input acquisition capability.

What reference voltage options are supported by the AD7655SCP-EP-RL?

The AD7655SCP-EP-RL requires an external reference voltage applied to the REF pin, with a valid range of 2.3 V to 2.5 V (or up to AVDD/2). It draws 180 µA from the reference at 1 MSPS. The device does not include an internal reference; using a precision 2.5 V reference (e.g., ADR4525) ensures full 16-bit accuracy and minimizes full-scale error drift (±2 ppm/°C).