Analog Devices Inc. AD7982BCPZ-RL

Overview

AD7982BCPZ-RL from Analog Devices is an 18-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter with true differential input, ±VREF range, 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), supports external reference voltages from 2.4 V to 5.1 V, and delivers 98 dB SNR at 1 kHz with 5 V reference-ideal for high-fidelity data acquisition in medical instrumentation and automated test equipment.

For engineers reviewing the AD7982BCPZ-RL datasheet, AD7982BCPZ-RL pinout, AD7982BCPZ-RL application, or AD7982BCPZ-RL equivalent, key selection considerations include its 18-bit no-missing-codes performance, 1 MSPS throughput with 710 ns max conversion time, differential input common-mode rejection of 67 dB at 450 kHz, 7 mW total power at full speed, and dual-package availability in 10-lead LFCSP (CP-10-9) and MSOP (RM-10).

Technical Context

The AD7982BCPZ-RL implements a fully synchronous SAR conversion core triggered by the rising edge of CNV, sampling the voltage difference between IN+ and IN− with aperture delay of just 2 ns. Its zero-latency architecture ensures immediate data availability post-conversion without pipeline delay, and its proprietary serial interface supports both CS mode (3- or 4-wire) and chain mode for multi-ADC daisy-chaining with optional busy indicator.

It features separate analog (VDD, REF, GND) and digital I/O (VIO) supplies, enabling mixed-voltage system integration. The analog input stage accepts true differential signals up to ±5 V with 10 MHz −3 dB bandwidth and 200 nA leakage during acquisition, while the digital interface complies with SPI timing across VIO ranges from 1.71 V to 5.5 V-including sub-2.3 V operation at reduced 800 kSPS throughput.

Key Specifications

Pinout & Package

AD7982BCPZ-RL is packaged in a 3 mm × 3 mm, 10-lead lead frame chip scale package (LFCSP, CP-10-9) with exposed pad (EPAD) that must be connected to GND for 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 AD7982BCPZ-RL, AD7989-5BCPZ-RL trades speed for noise floor, while AD4003BRMZ-RL adds reference integration and AC performance at the cost of pin compatibility and VIO flexibility-making AD7982BCPZ-RL the optimal balance of speed, power, and interface adaptability for mixed-voltage, multi-ADC systems.

Availability

AD7982BCPZ-RL is available at Aetrix Electronics and suitable for automated test equipment, medical instruments, and machine automation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AD7982BCPZ-RL 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 Wilmington, MA.

The AD7982BCPZ-RL belongs to Analog Devices' precision SAR ADC product line, designed specifically for high-fidelity data acquisition in applications demanding 18-bit resolution, low power, and flexible digital interfacing without sacrificing speed or accuracy.

FAQ

What is the maximum sampling rate of the AD7982BCPZ-RL?

The AD7982BCPZ-RL 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 timing constraints in the serial interface. This behavior is explicitly specified in Table 5 of the Rev. E datasheet and verified across temperature and supply conditions.

Does the AD7982BCPZ-RL require an external reference voltage?

Yes, the AD7982BCPZ-RL 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; its full-scale range is ±VREF, and accuracy depends directly on reference stability and noise-hence the requirement for local 10 μF decoupling to GND.

Can the AD7982BCPZ-RL operate with a 1.8 V digital interface supply?

Yes, the AD7982BCPZ-RL supports VIO from 1.71 V to 5.5 V, including 1.8 V logic levels. At 1.8 V, VIH is defined as 0.9 × VIO (1.62 V min) and VIL as +0.1 × VIO (0.18 V max), ensuring reliable interfacing with low-voltage FPGAs and microcontrollers without level-shifting circuitry.

What package types are available for the AD7982BCPZ-RL?

The AD7982BCPZ-RL is offered exclusively in the 10-lead LFCSP (CP-10-9) package: 3 mm × 3 mm body with exposed pad. The "BCPZ" suffix denotes this LFCSP variant; the MSOP version carries the "BRMZ" suffix (e.g., AD7982BRMZ-RL). Both share identical electrical specifications but differ in thermal resistance (θJA = 48.7°C/W for CP-10-9 vs. 200°C/W for RM-10).

How does the daisy-chain mode work on the AD7982BCPZ-RL?

In daisy-chain (chain) mode, the AD7982BCPZ-RL uses SDI as both mode selector and data input: when SDI is low at the CNV rising edge, the device enters chain mode. Conversion results from upstream ADCs propagate through SDI with an 18-cycle delay, allowing multiple AD7982BCPZ-RL devices to share one SDO line and three wires (CNV, SCK, SDI), reducing interconnect complexity in multi-channel systems.