Analog Devices Inc. AD7693BRMZ

Overview

AD7693BRMZ from Analog Devices is a 16-bit, successive approximation analog-to-digital converter (ADC) with true differential input, ±0.5 LSB max INL/DNL, 500 kSPS throughput, and no pipeline delay. It operates from a single 4.5 V to 5.5 V supply, supports 1.8 V–5 V logic via separate VIO, and targets precision data acquisition in battery-powered instrumentation and seismic systems.

For engineers reviewing the AD7693BRMZ datasheet, AD7693BRMZ pinout, AD7693BRMZ application, or AD7693BRMZ equivalent, this page delivers verified specifications, validated MSOP-10 pin functions, real-world timing and noise performance (96 dB SINAD, −120 dB THD at 1 kHz), and confirmed drop-in alternatives for design continuity and sourcing flexibility.

Technical Context

The AD7693BRMZ uses a charge redistribution SAR architecture with on-chip track-and-hold, enabling zero-latency conversion and full 16-bit accuracy without missing codes. Its internal conversion clock eliminates dependency on SCK for sampling, supporting flexible interface modes including daisy-chain and CS-based SPI/QSPI/MICROWIRE-compatible serial communication.

It features true differential analog inputs (±VREF range), 9 MHz −3 dB input bandwidth, and 2.5 ns aperture delay - all optimized for high-fidelity acquisition of fast transient signals in multiplexed or standalone channel configurations. Power scales linearly with throughput: 40 nJ/conversion at 500 kSPS, 1 nA standby current.

Key Specifications

Pinout & Package

AD7693BRMZ is housed in a 10-lead MSOP package (3.0 mm × 4.9 mm, 0.5 mm pitch), rated for operation from −40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7693BRMZ, AD7687BRMZ trades speed and temperature-stable linearity for lower cost, while AD7691BRMZ extends resolution and noise performance at the expense of stricter analog front-end requirements and higher system-level validation burden.

Availability

AD7693BRMZ is available at Aetrix Electronics and suitable for seismic data acquisition, portable DVMs, and medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.

Supply support for AD7693BRMZ 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 AD7693BRMZ belongs to the PulSAR® family of precision SAR ADCs, designed specifically for high-speed, low-power, and high-accuracy data acquisition in portable, industrial, and medical systems.

FAQ

What is the maximum sampling rate supported by the AD7693BRMZ?

The AD7693BRMZ supports a maximum throughput of 500 kSPS under specified conditions (VDD = 4.5 V to 5.5 V, VREF = VDD). At this rate, conversion time is 1.6 μs, and total power dissipation is 18 mW. The device maintains full 16-bit accuracy and ±0.5 LSB INL/DNL across the entire operating temperature range of −40°C to +85°C. This makes the AD7693BRMZ suitable for real-time acquisition of signals with bandwidths up to ~200 kHz.

Does the AD7693BRMZ require an external reference voltage?

Yes, the AD7693BRMZ requires an external reference voltage applied to the REF pin. The reference range is 0.5 V to VDD, and it directly defines the full-scale differential input range (±VREF). A 10 µF ceramic capacitor must be placed close to the REF pin for stability. While the AD7693BRMZ does not include an internal reference, its architecture allows use of precision external references such as the ADR4550 or REF195 to achieve optimal INL and THD performance.

Is the AD7693BRMZ pin-compatible with other PulSAR ADCs?

Yes, the AD7693BRMZ is pin-for-pin compatible with the AD7687BRMZ, AD7688BRMZ (16-bit), and AD7690BRMZ, AD7691BRMZ (18-bit) in the same 10-lead MSOP package. This compatibility enables direct hardware substitution during design iteration or performance scaling - for example, upgrading from 16-bit to 18-bit resolution without PCB redesign. However, firmware must be updated to handle differing data widths and timing parameters.

What digital interface protocols does the AD7693BRMZ support?

The AD7693BRMZ supports SPI®, QSPI™, MICROWIRE™, and DSP-compatible serial interfaces through its proprietary 3- or 4-wire configuration. It offers two primary modes: CS mode (chip-select driven) and Chain mode (daisy-chain enabled). Both support optional busy indicator functionality. The interface is voltage-flexible via the VIO pin (1.8 V to 5 V), and timing parameters scale with VIO level - for example, minimum SCK period is 17 ns when VIO > 4.5 V.

How does the AD7693BRMZ manage power consumption at low sampling rates?

The AD7693BRMZ scales power linearly with throughput: it consumes 40 μW at 1 kSPS, 4 mW at 100 kSPS, and 18 mW at 500 kSPS (all at 5 V). In standby mode - achieved by holding CNV low - quiescent current drops to 1 nA. This ultra-low standby current, combined with no pipeline delay, makes the AD7693BRMZ especially effective in duty-cycled applications like battery-powered data loggers, where the ADC can be awakened, acquire one sample, and return to deep sleep within microseconds.