AD7942BRMZ-RL7

Overview

The AD7942BRMZ-RL7 is a 14-bit, 250 kSPS PulSAR successive approximation analog-to-digital converter manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from 2.3 V to 5.5 V and features a pseudo-differential analog input range of 0 V to VREF. The device incorporates an internal conversion clock and a versatile serial interface compatible with SPI, QSPI, Microwire, and DSP standards. Key performance metrics include a typical Signal-to-Noise Ratio (SNR) of 85 dB at 20 kHz, a maximum Integral Nonlinearity (INL) of ±1 LSB, and a throughput rate of 250 kSPS. Power dissipation scales linearly with throughput, reaching 12.5 mW at 5 V and 250 kSPS.

Feature Summary

• Pseudo-differential analog input architecture supporting ground-referenced signals
• Versatile serial interface enabling daisy-chaining and busy indicator functionality
• Internal track-and-hold circuit with no pipeline delay for multiplexed applications
• Low power consumption with standby current of 1 nA

Applications

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

Procurement Notes

Verify the specific ordering suffix RL7 corresponds to reel packaging requirements. Confirm that the BRMZ variant matches the required MSOP package dimensions and lead-free specifications. Ensure compatibility with the host system's digital logic voltage levels before finalizing procurement.

Selection Notes

Select this component when a 14-bit resolution and 250 kSPS throughput are sufficient for the application. Consider the pseudo-differential input structure if common-mode noise rejection is required without complex differential signaling. Evaluate power constraints against the specified dissipation rates at target operating voltages and data rates.

Part Context

This part belongs to the AD7942 family of PulSAR ADCs. It is pin-for-pin compatible with the 16-bit AD7685, allowing for potential upgrades in resolution within the same footprint. The device is designed for space-constrained applications utilizing the 10-lead MSOP or LFCSP packages.

Replacement Considerations

The AD7685 is a pin-compatible alternative offering 16-bit resolution. Verify interface timing and power requirements when substituting.