AD7854ARZ

Overview

The AD7854ARZ is a 12-bit, high-speed Analog-to-Digital Converter (ADC) manufactured by Analog Devices Inc. It operates from a single 3 V to 5.5 V supply and supports throughput rates up to 200 kSPS with a master clock frequency of 4 MHz. The device features a pseudo-differential analog input range of 0 V to VREF or ±VREF/2. Key electrical parameters include a maximum Integral Nonlinearity error of ±1 LSB and a typical Signal-to-Noise + Distortion Ratio of 70 dB at a 10 kHz input signal. Power consumption is typically 15 mW in normal operation at 3 V, dropping to 1.3 mW at 10 kSPS via automatic power-down.

Feature Summary

• Integrated self-calibration and system calibration capabilities to maintain accuracy over temperature variations.
• Flexible parallel interface supporting both 12-bit and 8-bit data bus configurations.
• Multiple power management modes including automatic power-down after conversion.

Applications

• Battery-powered systems such as personal digital assistants and mobile communications devices.
• Medical instruments requiring low power consumption and precision.
• Instrumentation and control systems utilizing high-speed sampling.

Procurement Notes

Verify the specific revision suffix against the manufacturer's current ordering guide to ensure compatibility with required linearity grades and package types. Confirm that the component meets RoHS compliance standards for your region. Cross-reference the datasheet version to validate timing specifications and absolute maximum ratings before finalizing procurement.

Selection Notes

Select the AD7854ARZ when a 12-bit resolution and 200 kSPS throughput are required within a 3 V to 5 V supply domain. Consider the AD7854L variant if lower power dissipation is prioritized over maximum speed. Ensure the application can accommodate the 28-lead SOIC package dimensions and provides adequate thermal dissipation for the specified power levels.

Part Context

The AD7854ARZ belongs to the AD7854 family of CMOS sampling ADCs designed for high-speed, low-power applications. This series includes variants optimized for different performance trade-offs, such as the AD7854L for reduced power consumption. The ARZ designation indicates a specific linearity grade and a 28-lead Small Outline Integrated Circuit (SOIC) package suitable for surface-mount assembly.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7854BR and AD7854ARS. Verify that alternative part numbers match the required integral nonlinearity specifications and operating temperature ranges. Ensure that any substitute maintains the same 28-lead SOIC footprint and voltage supply requirements.