AD7986BCPZ

Overview

The AD7986BCPZ is an 18-bit, 2 MSPS PulSAR analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features a successive approximation architecture with true differential analog inputs and a throughput of up to 2 MSPS in turbo mode or 1.5 MSPS in normal mode. The device includes a 4.096 V internal reference with ±10 ppm/°C drift and supports external references up to 5.0 V. Power dissipation ranges from 15 mW to 29 mW depending on the reference configuration and sampling rate. It operates with AVDD/DVDD at 2.5 V and a logic interface voltage (VIO) between 1.8 V and 2.7 V. The component is housed in a 20-lead LFCSP package.

Feature Summary

• Supports SPI, QSPI, Microwire, and DSP-compatible serial interfaces with daisy-chaining capability.
• Features a low-power SAR architecture with no pipeline delay for immediate data availability.
• Includes an on-chip 4.096 V bandgap reference with buffer and error correction circuits.

Applications

• Battery-powered equipment
• Data acquisition systems
• Medical instruments
• Seismic data acquisition systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to ensure correct packaging and temperature grade. Confirm that the required supply voltages match the system design constraints. Check for RoHS compliance status as indicated in the latest datasheet revision. Ensure the evaluation board compatibility if development support is needed.

Selection Notes

Select this component when high resolution and moderate speed are required for single-channel applications. Consider the internal reference for simplified designs or an external reference for optimized SNR performance. Evaluate the power consumption requirements against the available turbo and normal modes. Verify the digital interface compatibility with the host microcontroller or FPGA logic levels.

Part Context

The AD7986 belongs to the AD79xx family of 14-, 16-, and 18-bit PulSAR ADCs. It shares architectural similarities with the AD7985 (16-bit) and AD7944 (14-bit), offering comparable pinouts and interface options. This family is designed for space-constrained applications requiring high precision and low power consumption in industrial and medical environments.

Replacement Considerations

The AD7985 is a pin-compatible 16-bit alternative within the same series. The AD7944 offers a 14-bit resolution option with similar interface characteristics. Verify functional compatibility regarding resolution and throughput requirements before substitution.