AD7942BRMZ

Overview

The AD7942BRMZ is a 14-bit, 250 kSPS PulSAR analog-to-digital converter in a 10-lead MSOP package. It operates on a single supply from 2.3 V to 5.5 V with a pseudo-differential input range of 0 V to VREF. The device features an internal conversion clock and a versatile serial interface compatible with SPI, QSPI, Microwire, and DSP standards. Key performance metrics include a typical SNR of 85 dB at 20 kHz, INL of ±0.4 LSB typical, and power dissipation scaling linearly with throughput.

Feature Summary

• Charge redistribution successive approximation architecture with no missing codes
• Versatile serial interface supporting daisy-chaining and busy indicator
• Internal track-and-hold circuit with short aperture delay
• Low standby current for battery-powered applications

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm packaging type and reel specifications. Ensure compatibility with system voltage requirements before procurement. Cross-reference the component revision history to confirm feature consistency. Validate RoHS compliance status through official datasheets or certificates of conformity prior to finalizing purchase orders.

Selection Notes

Select this component when a 14-bit resolution and 250 kSPS throughput are required within a compact MSOP footprint. Consider the pseudo-differential input structure for noise rejection capabilities. Evaluate the external reference voltage requirements as the part does not contain an internal reference. Assess power consumption profiles based on the specific operating throughput and supply voltage conditions.

Part Context

The AD7942 belongs to Analog Devices' PulSAR ADC family, designed for low-power, high-speed data conversion tasks. It shares pin compatibility with other members like the AD7685, facilitating design upgrades. The device utilizes a proprietary serial interface that reduces pin count while maintaining flexibility for various digital logic levels.

Replacement Considerations

The AD7685 is a pin-for-pin compatible 16-bit alternative offering higher resolution. For lower speed requirements, the AD7940 provides similar functionality at reduced throughput. Designers should verify interface timing and power consumption differences when substituting these components.