AD7942BCPZRL

Overview

The AD7942BCPZRL is a 14-bit, 250 kSPS PulSAR analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features a successive approximation architecture with no missing codes and operates from a single supply voltage ranging from 2.3 V to 5.5 V. The device utilizes a pseudo-differential input structure referenced to ground sense. Key electrical parameters include an integral nonlinearity of ±1 LSB maximum, a signal-to-noise ratio of 85 dB at 20 kHz, and total harmonic distortion of −100 dB. Power consumption scales linearly with throughput, reaching 12.5 mW at 5 V and 250 kSPS. The component is housed in a 10-lead LFCSP package and supports SPI/QSPI/MICROWIRE/DSP-compatible serial interfaces.

Feature Summary

• Charge redistribution successive approximation architecture with internal conversion clock
• Versatile serial interface supporting daisy-chaining and busy indicator functionality
• Low noise track-and-hold circuit with short aperture delay
• Single-supply operation compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic levels

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and reel specifications. Ensure compatibility with system voltage requirements and interface protocols before integration. Cross-reference the part number with official distributor catalogs to validate availability and lead times for production planning.

Selection Notes

Select this component for applications requiring high precision with low power consumption. Consider the thermal impedance characteristics when designing the PCB layout. Evaluate the source impedance requirements to maintain optimal THD performance. Verify that the external reference voltage meets the specified range relative to the supply voltage.

Part Context

The AD7942 belongs to the PulSAR family of ADCs, designed for space-constrained environments. It offers pin-for-pin compatibility with the 16-bit AD7685, facilitating design upgrades without board modifications. The LFCSP package provides a compact footprint suitable for dense PCB layouts while maintaining thermal efficiency.

Replacement Considerations

The AD7685 is a pin-for-pin compatible alternative offering 16-bit resolution. Other members of the PulSAR family may require interface adjustments due to differing pin configurations or timing specifications.