Analog Devices Inc. AD7683ARMZRL7

Overview

AD7683ARMZRL7 from Analog Devices is a 16-bit, 100 kSPS, pseudo-differential successive approximation ADC with no missing codes (B grade), single-supply operation (2.7 V to 5.5 V), SPI/QSPI/MICROWIRE-compatible serial interface, and ultra-low standby current of 1 nA - deployed in battery-powered instrumentation and medical sensors for high-resolution DC/low-frequency analog signal digitization.

For engineers reviewing the AD7683ARMZRL7 datasheet, AD7683ARMZRL7 pinout, AD7683ARMZRL7 application, or AD7683ARMZRL7 equivalent, key selection criteria include its 16-bit monotonicity, ±1 LSB typical INL, 8-lead MSOP/QFN package compatibility, 400 ns acquisition time, and reference-flexible input range (0 V to VREF, VREF up to VDD).

Technical Context

The AD7683ARMZRL7 implements a charge redistribution SAR architecture with integrated track-and-hold, delivering zero pipeline latency and deterministic conversion timing. Its pseudo-differential input structure rejects common-mode noise while enabling remote ground sensing via the –IN pin.

Conversion is initiated on the CS falling edge; sampling occurs during acquisition phase (400 ns), followed by 22–24 clock cycles for 16-bit serial output. Power scales linearly with throughput - consuming only 150 µW at 10 kSPS/2.7 V - and enters 1 nA shutdown between conversions.

Key Specifications

Pinout & Package

AD7683ARMZRL7 is available in an 8-lead MSOP (3 mm × 3 mm) and an 8-lead QFN (LFCSP, 3 mm × 3 mm, exposed pad). Both packages share identical pin numbering and terminal functions. The exposed pad in QFN must be connected to GND for thermal performance but is not required for electrical specification compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7685BRMZ and ADS8325IP, AD7683ARMZRL7 uniquely balances ultra-low power (1 nA standby), guaranteed monotonicity, and integrated track-and-hold - making it optimal for precision, battery-operated, low-throughput measurement systems where size and energy efficiency are primary constraints.

Availability

AD7683ARMZRL7 is available at Aetrix Electronics and suitable for portable medical instruments, industrial temperature transmitters, handheld multimeters, and lab data acquisition modules requiring stable component supply and long-term lifecycle support.

Supply support for AD7683ARMZRL7 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 AD7683ARMZRL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for high-resolution, low-power, single-supply data acquisition in portable and industrial instrumentation.

FAQ

What is the maximum DCLOCK frequency supported by AD7683ARMZRL7?

The AD7683ARMZRL7 supports a maximum DCLOCK frequency of 2.9 MHz, enabling reliable 100 kSPS operation with sufficient timing margin. At this clock rate, the device completes each 16-bit conversion in 22–24 clock cycles, corresponding to a 10 µs total cycle time. Exceeding 2.9 MHz may violate setup/hold timing and cause data corruption on DOUT.

Does AD7683ARMZRL7 require an external reference voltage?

Yes, AD7683ARMZRL7 requires an external reference voltage applied to the REF pin. It accepts VREF from 0.5 V to VDD (2.7 V to 5.5 V), and performance is optimized with a low-noise, low-drift source such as the ADR431 (2.5 V) or ADR435 (5.0 V), decoupled using a 2.2–10 µF X5R ceramic capacitor directly to GND.

Can AD7683ARMZRL7 operate from a 2.7 V supply while maintaining full 16-bit performance?

Yes, AD7683ARMZRL7 is fully specified at 2.7 V supply, delivering 16-bit resolution with no missing codes, ±1 LSB typical INL, and 85 dB SNR (VREF = 2.5 V). Its operating current drops to 560 µA at 100 kSPS, and power dissipation falls to 1.5 mW - confirming full functionality across the entire 2.7–5.5 V range.

What is the purpose of the –IN pin on AD7683ARMZRL7?

The –IN pin on AD7683ARMZRL7 serves as the analog ground sense reference for the pseudo-differential input. It enables remote ground sensing - for example, connecting –IN to the sensor's local ground eliminates ground potential differences in long-cable applications - while allowing +IN to measure 0 V to VREF relative to that sensed point.

Is AD7683ARMZRL7 compatible with standard SPI controllers?

Yes, AD7683ARMZRL7 is fully compatible with standard SPI controllers operating in Mode 0 (CPOL = 0, CPHA = 0), supporting 3-wire interface (CS, DCLOCK, DOUT) with MSB-first, straight-binary output. It requires no special framing or command bytes - conversion starts automatically on CS fall, and data appears synchronously on DCLOCK edges.