Analog Devices Inc. AD7680ARMZ

Overview

AD7680ARMZ from Analog Devices is a 16-bit, unipolar, successive approximation ADC in a 6-lead SOT-23 package, operating from a single 2.5 V to 5.5 V supply with 100 kSPS throughput, 3 mW typical power at 2.5 V, and 0–VDD input range - deployed in battery-powered medical instruments and portable data acquisition systems.

For engineers reviewing the AD7680ARMZ datasheet, AD7680ARMZ pinout, AD7680ARMZ application, or AD7680ARMZ equivalent, key selection considerations include its SOT-23 footprint constraint, internal VDD-referenced architecture, no-missing-codes performance up to 15 bits, SPI/QSPI/μWire-compatible serial interface, and absence of pipeline delay for deterministic timing in embedded control loops.

Technical Context

The AD7680ARMZ 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 analog input range from 0 V to VDD.

Conversion timing is fully synchronous to the external SCLK (up to 2.5 MHz), requiring exactly 20 or 24 clock cycles for 16-bit data output - with no pipeline latency and deterministic 8 μs max conversion time. Power management includes a dedicated standby mode drawing ≤0.5 μA, activated via CS control without additional pins.

Key Specifications

Pinout & Package

AD7680ARMZ is housed in a 6-lead SOT-23 package (JEDEC MO-178AA), measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and thermal pad omitted - optimized for space-constrained PCB layouts in handheld diagnostics and wearable monitors.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7680ARMZ, AD7683BRMZ trades package size for marginally better thermal performance but adds layout overhead, while ADS8325IDGSR reduces power slightly at the cost of reference dependency and reduced input flexibility - making AD7680ARMZ optimal for space- and supply-constrained unipolar sensing.

Availability

AD7680ARMZ is available at Aetrix Electronics and suitable for battery-powered medical instruments, remote data acquisition nodes, and portable optical sensor interfaces requiring stable component supply across extended production lifecycles.

Supply support for AD7680ARMZ 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 R&D and manufacturing operations spanning 15 countries.

The AD7680ARMZ belongs to Analog Devices' PulSAR® family of low-power, high-speed SAR ADCs - engineered specifically for portable, battery-operated instrumentation where resolution, size, and energy efficiency are co-constrained.

FAQ

What is the maximum sample rate supported by the AD7680ARMZ?

The AD7680ARMZ supports a maximum throughput rate of 100 kSPS under specified conditions (VDD = 2.5–5.5 V, fSCLK = 2.5 MHz). This rate is achieved with a minimum 20 SCLK cycles per conversion, yielding a guaranteed 8 μs conversion time. Performance remains stable across the full industrial temperature range (−40°C to +85°C) for both A and B versions.

Does the AD7680ARMZ require an external voltage reference?

No, the AD7680ARMZ does not require an external voltage reference. It derives its reference internally from the VDD supply, enabling a full-scale analog input range of 0 V to VDD. This architecture eliminates external reference components and associated layout sensitivity, while maintaining 86 dB SNR and ±3.5 LSB INL at VDD = 4.096 V.

What package type is used for the AD7680ARMZ?

The AD7680ARMZ is packaged in a 6-lead SOT-23 (JEDEC MO-178AA) with gull-wing leads, measuring 2.9 mm × 1.6 mm × 1.1 mm. This package is distinct from the 8-lead MSOP variant (e.g., AD7680BCPZ) and is specifically optimized for ultra-compact PCB layouts in handheld and wearable electronics.

How does the AD7680ARMZ manage power consumption during idle periods?

The AD7680ARMZ enters a full power-down mode drawing ≤0.5 μA when CS is held high, with power-up time of 1 μs. This mode is controlled solely via the CS pin - no additional control lines or configuration registers are needed. At 100 kSPS with 2.5 V supply, it consumes just 3 mW typ, making it ideal for duty-cycled sensor nodes.

Is the AD7680ARMZ compatible with standard SPI microcontrollers?

Yes, the AD7680ARMZ features a native SPI-compatible serial interface (also supporting QSPI, μWire, and DSP protocols). It outputs MSB-first 16-bit data preceded by four leading zeros on the SDATA pin, synchronized to the falling edge of SCLK. No frame synchronization or mode configuration is required - direct connection to SPI peripherals is fully functional.