Analog Devices Inc. AD7680BRMZ-REEL7

Overview

AD7680BRMZ-REEL7 from Analog Devices is a 16-bit, successive approximation analog-to-digital converter (ADC) in a 6-lead SOT-23 package, operating from a single 2.5 V to 5.5 V supply with 100 kSPS throughput and 3 mW typical power at 2.5 V. It features internal VDD-referenced conversion, no pipeline delay, and SPI/QSPI/μWire/DSP-compatible serial interface-designed for space-constrained, battery-powered data acquisition systems.

For engineers reviewing the AD7680BRMZ-REEL7 datasheet, AD7680BRMZ-REEL7 pinout, AD7680BRMZ-REEL7 application, or AD7680BRMZ-REEL7 equivalent, key selection considerations include unipolar input range (0 V to VDD), 86 dB SNR at 10 kHz, 8 μs max conversion time, 30 ps aperture jitter, and SOT-23 footprint compatibility with low-power embedded signal chain designs.

Technical Context

The AD7680BRMZ-REEL7 implements a capacitive DAC-based successive approximation architecture with integrated track-and-hold, sampling on the falling edge of CS and initiating conversion simultaneously. Its reference is derived directly from VDD, eliminating external reference components and enabling full-scale input range from 0 V to VDD.

It supports flexible serial clock management: conversion rate scales with SCLK frequency (up to 2.5 MHz), and power-down mode reduces current to 0.5 μA max. The device operates without pipeline latency and delivers 16-bit straight binary output via SDATA on SCLK falling edges, with four leading zeros followed by 16 data bits.

Key Specifications

Pinout & Package

AD7680BRMZ-REEL7 is housed in a 6-lead SOT-23 package (JEDEC MO-178AA), measuring 2.9 mm × 1.6 mm × 1.1 mm, optimized for ultra-compact PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar unipolar 16-bit SAR ADC applications.

Compared with AD7683BRMZ-REEL7 and ADS8325IDGSR, AD7680BRMZ-REEL7 uniquely balances ultra-small size, zero-reference-component operation, and sub-3 mW active power-making it optimal for volume-sensitive, battery-limited applications where 100 kSPS is sufficient and board space is premium.

Availability

AD7680BRMZ-REEL7 is available at Aetrix Electronics and suitable for portable medical instrumentation, remote data acquisition nodes, optical sensor interfaces, and industrial process monitoring requiring stable component supply across extended production lifecycles.

Supply support for AD7680BRMZ-REEL7 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers and manufacturing facilities worldwide.

The AD7680BRMZ-REEL7 belongs to Analog Devices' PulSAR® family of low-power, high-speed SAR ADCs-engineered specifically for battery-operated and space-constrained applications demanding 16-bit precision without external references or complex power sequencing.

FAQ

What is the maximum analog input frequency supported by the AD7680BRMZ-REEL7?

The AD7680BRMZ-REEL7 has a full-power bandwidth of 7 MHz at VDD = 4.096 V (−3 dB point) and 2 MHz at VDD = 2.5 V to 3.6 V. For high-fidelity digitization, its usable small-signal bandwidth extends to 2.2 MHz (−0.1 dB) at VDD = 4.096 V. Performance degrades above these frequencies due to aperture jitter and track-and-hold limitations-designers should apply anti-alias filtering accordingly.

Does the AD7680BRMZ-REEL7 require an external voltage reference?

No, the AD7680BRMZ-REEL7 uses an internal VDD-derived reference, making it self-contained with no external reference required. This enables a 0 V to VDD unipolar input range and simplifies system design-especially in battery-powered applications where reference ICs would add cost, power, and board area. Decoupling VDD with 0.1 µF ceramic and 10 µF tantalum capacitors is essential for reference stability.

Can the AD7680BRMZ-REEL7 interface directly with 5 V logic microcontrollers?

Yes-the digital inputs (CS, SCLK) tolerate up to 7 V, allowing direct connection to 5 V logic systems even when VDD = 2.5 V or 3.3 V. However, the SDATA output level remains rail-to-rail with VDD (e.g., 0–3.3 V), so level-shifting may be needed for reliable reception by 5 V SPI masters unless they support 3.3 V–tolerant inputs.

What is the guaranteed data validity window after the SCLK falling edge for AD7680BRMZ-REEL7?

The AD7680BRMZ-REEL7 guarantees data access time (t4) of ≤120 ns at 5 V VDD and ≤80 ns at 3 V VDD after the SCLK falling edge. This timing ensures robust setup for standard microcontroller SPI peripherals operating at ≤10 MHz SCLK-no additional wait states are required when interfacing with ARM Cortex-M or ADSP-BF5xx processors.

How does the AD7680BRMZ-REEL7 achieve low power consumption during idle periods?

The AD7680BRMZ-REEL7 enters full power-down mode when CS remains high and SCLK is inactive, drawing ≤0.5 μA at VDD = 5.5 V. Power-up time from this state is 1 μs typical, enabling rapid wake-and-convert operation. This feature is essential for duty-cycled sensor nodes-allowing average current to drop below 10 μA in systems sampling once per second.