AD7942BCPZRL7

Overview

The AD7942BCPZRL7 is a 14-bit, 250 kSPS PulSAR analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features a successive approximation architecture with pseudo-differential inputs and operates on a single supply voltage ranging from 2.3 V to 5.5 V. The device supports 1.8 V, 2.5 V, 3 V, or 5 V logic interfaces via a separate VIO pin. Key performance metrics include an SNR of 85 dB at 20 kHz, THD of -100 dB, and INL of ±1 LSB maximum. Power consumption scales with throughput, reaching 12.5 mW at 5 V/250 kSPS. It is housed in a 10-lead LFCSP package.

Feature Summary

• Charge redistribution SAR architecture with no missing codes
• Versatile serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards
• Daisy-chaining capability for multiple ADCs with busy indicator support
• Low power operation with standby current of 1 nA

Applications

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

Procurement Notes

Verify the specific ordering suffix RL7 corresponds to reel packaging when sourcing components. Confirm that the BC grade meets the required temperature range specifications for your application environment. Ensure compatibility with the host system's digital logic levels before finalizing procurement decisions.

Selection Notes

Select this component for applications requiring high precision with low power consumption. Consider the pseudo-differential input structure for noise rejection. Evaluate the external reference voltage requirements as the part utilizes an external VREF pin. Check the available packages against board space constraints, noting the compact LFCSP footprint.

Part Context

This model belongs to the AD7942 series of PulSAR ADCs. It shares architectural similarities with other members like the AD7940 and AD7946 but offers specific resolution and speed characteristics. The device is designed to fit into the same footprint as smaller 8-lead packages while providing enhanced performance capabilities.

Replacement Considerations

The AD7942 is pin-for-pin compatible with the 16-bit AD7685. Designers upgrading from lower-resolution devices may consider this direct replacement option without significant PCB layout changes.