AD7946BCPZRL7

Overview

The AD7946BCPZRL7 is a 14-bit, 500 kSPS PulSAR analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single 5 V supply with logic interfaces compatible with 1.8 V, 2.5 V, 3 V, or 5 V levels via the separate VIO pin. The device features a throughput of 500 kSPS, an INL of ±0.4 LSB typical, and a SINAD of 85 dB at 20 kHz. Power dissipation scales linearly with throughput, reaching 19 mW at maximum speed. It is housed in a 10-lead LFCSP package.

Feature Summary

• Charge redistribution successive approximation architecture with no missing codes
• Versatile serial interface supporting SPI, QSPI, Microwire, and DSP modes
• Daisy-chain capability for multiple ADCs on a single bus
• Low power consumption with standby current of 1 nA

Applications

• Battery-powered equipment
• Data acquisition systems
• Instrumentation
• Medical instruments
• Process control

Procurement Notes

Verify the specific ordering suffix RL7 to confirm reel packaging requirements. Ensure the component matches the LFCSP-10 package variant rather than the MSOP option. Confirm that the voltage reference and supply conditions align with the specified operational range before finalizing procurement orders.

Selection Notes

Select this component when a 14-bit resolution and 500 kSPS throughput are required within a single-supply 5 V system. Consider the LFCSP package for space-constrained designs compared to the MSOP alternative. Evaluate the need for daisy-chaining capabilities if multiple channels are present in the application design.

Part Context

This part belongs to the AD794x family of PulSAR ADCs, which includes variants with different resolutions and speeds such as the AD7940 and AD7942. The AD7946 specifically targets applications requiring high accuracy and moderate speed. It shares architectural similarities with other members of the series while offering distinct performance characteristics suited for precision data acquisition tasks.

Replacement Considerations

The AD7946 is pin-for-pin compatible with the 16-bit AD7686. Designers may consider the AD7686 if higher resolution is needed without changing the board layout. Other family members like the AD7940 or AD7942 offer lower speeds but may be suitable for cost-sensitive applications.