Analog Devices Inc. AD7683BRMZRL7

Overview

AD7683BRMZRL7 from Analog Devices is a 16-bit, 100 kSPS, pseudo-differential successive approximation ADC operating from a single 2.7 V to 5.5 V supply. It features ±1 LSB typical INL, SPI/QSPI/MICROWIRE-compatible serial interface, and 1 nA standby current. Used in portable instrumentation for high-resolution DC/low-frequency analog signal digitization.

For engineers reviewing the AD7683BRMZRL7 datasheet, AD7683BRMZRL7 pinout, AD7683BRMZRL7 application, or AD7683BRMZRL7 equivalent, key selection criteria include its 16-bit no-missing-codes performance, ultra-low power at partial throughput (150 µW @ 10 kSPS), MSOP/QFN package compatibility, and external reference flexibility (0.5 V to VDD).

Technical Context

The AD7683BRMZRL7 employs a charge redistribution SAR architecture with integrated track-and-hold, delivering zero pipeline latency and true 16-bit linearity without missing codes. Its pseudo-differential input accepts 0 V to VREF across +IN/–IN with remote ground sensing capability.

Conversion is initiated on CS falling edge; internal clock eliminates need for external timing control. Power scales linearly with throughput-enabling dynamic power optimization-and supports full shutdown with 1 nA standby current at 25°C.

Key Specifications

Pinout & Package

AD7683BRMZRL7 is available in an 8-lead MSOP (3 mm × 3 mm) or 8-lead QFN (LFCSP, 3 mm × 3 mm, exposed pad). Both packages share identical pinout and function mapping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8325IPW, AD7683BRMZRL7 offers superior integration (single supply, internal T/H, lower standby current); compared with AD7685BRMZ, it trades 150 kSPS headroom for 62% lower active power and identical footprint-making it optimal for ultra-low-power, DC-critical applications.

Availability

AD7683BRMZRL7 is available at Aetrix Electronics and suitable for battery-powered equipment, portable instrumentation, and industrial process monitoring requiring stable component supply and long-term manufacturability.

Supply support for AD7683BRMZRL7 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 Wilmington, MA.

The AD7683BRMZRL7 belongs to the PulSAR® family of precision SAR ADCs, designed specifically for low-power, high-accuracy data acquisition in space-constrained, battery-operated, and industrial measurement systems.

FAQ

What is the maximum recommended reference voltage for AD7683BRMZRL7?

The AD7683BRMZRL7 supports an external reference voltage from 0.5 V up to VDD. When VDD = 5.5 V, REF may be as high as 5.5 V; however, the datasheet specifies optimal performance with VREF ≤ VDD and recommends using VREF = VDD for full-scale utilization. For example, with VDD = 3.3 V, setting REF = 3.3 V yields 0–3.3 V input range and maximizes SNR.

Does AD7683BRMZRL7 require an external clock source?

No, AD7683BRMZRL7 does not require an external clock source for conversion timing. It contains an internal conversion clock. The DCLOCK pin is used solely for synchronizing serial data output (DOUT) and is driven by the host processor-not the ADC itself. Conversion initiation is controlled by the CS falling edge, and timing is internally managed.

Can AD7683BRMZRL7 operate from a 2.0 V supply?

AD7683BRMZRL7 is specified for 2.7 V to 5.5 V operation, but the Absolute Maximum Ratings table permits VDD down to 2.0 V. However, performance-including INL, SNR, and throughput-is not guaranteed below 2.7 V. At 2.0 V, startup behavior, reference regulation, and digital interface reliability are uncharacterized; therefore, 2.7 V remains the validated minimum for functional operation per datasheet specifications.

Is AD7683BRMZRL7 pin-compatible with AD7685BRMZ?

Yes, AD7683BRMZRL7 and AD7685BRMZ share identical 8-lead MSOP/QFN pinout, pin functions, and serial interface protocol. They are drop-in replacements for footprint and software-though AD7685BRMZ operates at 250 kSPS and draws higher current. No PCB changes are required when upgrading from AD7683BRMZRL7 to AD7685BRMZ in existing designs.

What is the purpose of the –IN pin on AD7683BRMZRL7?

The –IN pin on AD7683BRMZRL7 serves as the analog ground sense reference for the pseudo-differential input. It enables remote sensing of the signal source's ground potential-rejecting ground loop errors and common-mode noise. Unlike true differential inputs, –IN is not actively driven; it must be connected to either the local analog ground plane or the remote ground point of the sensor to maintain accurate 0 V to VREF measurement range at +IN.