Analog Devices Inc. AD7982BRMZRL7

Overview

AD7982BRMZRL7 from Analog Devices is an 18-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter with true differential input (±VREF), zero-latency architecture, and SPI-/QSPI-/MICROWIRE-compatible serial interface. It operates from a single 2.5 V supply with independent 1.8 V–5 V logic interface (VIO), delivers 98 dB SNR at 1 kHz, and targets high-precision data acquisition in automated test equipment and medical instrumentation.

For engineers reviewing the AD7982BRMZRL7 datasheet, AD7982BRMZRL7 pinout, AD7982BRMZRL7 application, or AD7982BRMZRL7 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The AD7982BRMZRL7 implements a fully differential SAR architecture with internal sampling capacitor array and proprietary serial interface supporting both CS mode (3- or 4-wire) and daisy-chainable chain mode. Its zero-latency conversion ensures no pipeline delay - output data is available immediately after CNV rising edge completion.

It accepts external reference voltage (2.4 V–5.1 V) independent of VDD, supports ±VREF differential input range with 67 dB CMRR at 450 kHz, and scales power linearly with throughput: 7 mW total at 1 MSPS, dropping to 70 μW at 10 kSPS. The dual-supply design separates analog core (VDD) from digital I/O (VIO) to minimize noise coupling.

Key Specifications

Pinout & Package

AD7982BRMZRL7 is packaged in a 10-lead MSOP (RM-10) with exposed pad. Pinout matches standard MSOP layout and is electrically identical to the LFCSP variant (CP-10-9); GND-connected exposed pad improves thermal performance but is not required for electrical functionality.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7982BRMZRL7, AD7989-5BRMZ trades throughput for enhanced harmonic suppression, while AD4020BCPZ-RL7 increases resolution at the cost of longer acquisition time and stricter reference sourcing - making AD7982BRMZRL7 the balanced choice for 1 MSPS, 18-bit, low-power precision DAQ.

Availability

AD7982BRMZRL7 is available at Aetrix Electronics and suitable for automated test equipment, medical instrumentation, and industrial data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7982BRMZRL7 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 AD7982BRMZRL7 belongs to Analog Devices' precision SAR ADC product line, engineered for high-resolution, low-power, and low-latency data acquisition in demanding industrial, medical, and test equipment applications.

FAQ

What is the maximum sampling rate of the AD7982BRMZRL7?

The AD7982BRMZRL7 achieves a maximum throughput of 1 MSPS when VIO exceeds 2.3 V. At VIO ≤ 2.3 V, the maximum rate drops to 800 kSPS due to reduced SCK timing margins. This is explicitly defined in Table 4 and Table 5 of the Rev. E datasheet under "THROUGHPUT RATE" with corresponding timing constraints for tSCK and tCYC.

Does the AD7982BRMZRL7 require an external reference voltage?

Yes, the AD7982BRMZRL7 requires an external reference voltage applied to the REF pin, which must be between 2.4 V and 5.1 V. The device does not include an internal reference; VREF directly defines the full-scale differential input range (±VREF) and impacts SNR, dynamic range, and ENOB as shown in Figures 11 and 14 of the datasheet.

Can the AD7982BRMZRL7 operate with a 1.8 V digital interface?

Yes, the AD7982BRMZRL7 supports 1.8 V digital logic via its dedicated VIO supply pin, which accepts 1.71 V to 5.5 V. When VIO = 1.8 V, VIH and VIL thresholds adjust accordingly (VIH ≥ 0.9 × VIO, VIL ≤ 0.1 × VIO), and SCK timing parameters scale to ensure reliable serial communication as specified in Table 5.

What package types are available for the AD7982BRMZRL7?

The AD7982BRMZRL7 is offered exclusively in the 10-lead MSOP (RM-10) package, identified by the "RMZ" suffix. While the base AD7982 part number appears in both MSOP and LFCSP variants, the BRMZRL7 ordering option corresponds specifically to the MSOP package with tape-and-reel delivery (RL7 suffix), as confirmed in the Ordering Guide on page 26 of Rev. E.

How does the daisy-chain mode function on the AD7982BRMZRL7?

In daisy-chain mode, the AD7982BRMZRL7 uses the SDI pin to accept upstream conversion data and shifts its own 18-bit result onto SDO with a fixed 18-SCK-cycle delay. This allows multiple AD7982BRMZRL7 devices to share one SDO line and one SCK line, reducing interconnect count in multi-channel systems - a feature verified in the "Chain Mode" sections (pages 23–24) and Figure 1 functional block diagram.