Analog Devices Inc. AD7693BRMZRL7

Overview

AD7693BRMZRL7 from Analog Devices is a 16-bit successive approximation analog-to-digital converter (ADC) with true differential input, ±0.5 LSB INL/DNL max, 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 AD7693BRMZRL7 datasheet, AD7693BRMZRL7 pinout, AD7693BRMZRL7 application, or AD7693BRMZRL7 equivalent, this page delivers verified technical context, real-world interface behavior, package-specific layout guidance, and validated alternative options for high-accuracy, low-power sampling designs.

Technical Context

The AD7693BRMZRL7 uses a charge redistribution SAR architecture with on-chip track-and-hold, enabling zero-latency conversion and full 16-bit resolution without missing codes. Its differential input stage accepts ±VREF ranges up to ±5 V and achieves 96.5 dB dynamic range and −120 dB THD at 1 kHz.

It features a proprietary SPI-compatible serial interface supporting daisy-chain mode and optional busy indicator, with timing fully specified across 1.8 V–5 V VIO levels. Power scales linearly with throughput: 40 nJ/conversion at 500 kSPS, 1 nA standby current, and no external clock required for conversion.

Key Specifications

Pinout & Package

AD7693BRMZRL7 is housed in a 10-lead MSOP package (4.9 mm × 3.0 mm × 1.0 mm), optimized for compact, low-noise PCB layouts with minimal parasitic capacitance on analog inputs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision SAR ADC applications.

Compared with AD7687BRMZ, AD7693BRMZRL7 delivers 2× throughput with identical layout and firmware compatibility; versus AD7691BRMZ, it trades 2 bits of resolution for 30% lower power and relaxed reference noise requirements-making it optimal for 16-bit, 500 kSPS embedded DAQ.

Availability

AD7693BRMZRL7 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.

Supply support for AD7693BRMZRL7 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 centers worldwide.

The AD7693BRMZRL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered specifically for high-speed, low-power, high-accuracy data acquisition in space-constrained, battery-operated, and noise-sensitive environments.

FAQ

What is the maximum recommended reference voltage for AD7693BRMZRL7?

The AD7693BRMZRL7 supports an external reference voltage (REF) from 0.5 V up to VDD, with VDD rated 4.5 V to 5.5 V. Therefore, the absolute maximum REF is 5.5 V. However, for optimal performance-including full 16-bit linearity and 96.5 dB dynamic range-the datasheet specifies testing at VREF = VDD = 5 V. Using REF > VDD risks violating absolute maximum ratings on the REF pin and may degrade INL or cause latch-up.

Does AD7693BRMZRL7 require an external clock for conversion?

No, AD7693BRMZRL7 does not require an external clock for conversion. It contains an internal conversion clock, so the SCK signal is used solely for serial data readout-not for controlling the sampling or conversion process. The CNV rising edge initiates acquisition and conversion autonomously, and result data becomes available after tCONV (≤1.6 μs). This eliminates timing dependency on host clock stability and simplifies system synchronization.

Can AD7693BRMZRL7 interface directly with a 1.8 V microcontroller?

Yes, AD7693BRMZRL7 can interface directly with a 1.8 V microcontroller by connecting the VIO pin to 1.8 V. Its digital interface is fully compatible with 1.8 V logic levels: VIH(min) = 0.7 × VIO = 1.26 V and VIL(max) = 0.3 × VIO = 0.54 V, well within standard 1.8 V CMOS thresholds. No level-shifter is needed, and timing parameters (e.g., tSCK, tDSDO) are explicitly characterized down to VIO = 2.3 V, with conservative margins at 1.8 V per application notes.

What is the purpose of the CNV pin beyond initiating conversion?

The CNV pin on AD7693BRMZRL7 serves three critical roles: (1) its rising edge triggers sampling and conversion, (2) it selects the serial interface mode (CS vs. Chain) based on SDI state at that edge, and (3) in CS mode, it acts as an active-low chip select enabling SDO output. When CNV is low, SDO is driven; when high, SDO enters high-impedance state-enabling shared bus operation. This multifunctionality reduces pin count and simplifies control logic versus dedicated mode-select or CS pins.

How does the AD7693BRMZRL7 handle input overvoltage conditions?

The AD7693BRMZRL7 includes integrated ESD diodes on IN+ and IN− pins, rated to clamp voltages within GND − 0.3 V to VDD + 0.3 V. Exceeding these limits forward-biases the diodes, allowing up to 130 mA continuous current. While this provides robustness against transient overvoltage, sustained operation outside this range risks damage or increased leakage (>1 nA). For overvoltage protection beyond ±0.3 V, external series resistors and clamping diodes to VDD/GND are recommended per the Analog Inputs section of the datasheet.