AD7854AR

Overview

The AD7854AR is a high-speed, low-power 12-bit analog-to-digital converter (ADC) from Analog Devices Inc. It operates on a single 3 V to 5.5 V supply and supports throughput rates up to 200 kSPS. The device features a pseudo-differential track-and-hold amplifier with a 500 ns acquisition time. It includes self-calibration and system calibration capabilities to maintain accuracy over temperature variations. Power management options include automatic power-down after conversion, achieving typical dissipation of 15 mW in normal mode at 3 V. The component utilizes a flexible parallel interface and is housed in a 28-lead SOIC package.

Feature Summary

• Supports both self-calibration and system calibration modes for enhanced long-term accuracy
• Features flexible power management with automatic power-down states to minimize energy consumption
• Provides a versatile parallel I/O port compatible with various microcontroller systems
• Operates with reference voltages ranging from 1.2 V to the analog supply voltage

Applications

• Battery-powered personal digital assistants and mobile communication devices
• Medical instrumentation requiring precise signal acquisition
• Pen computers and portable data collection systems
• High-speed modem applications

Procurement Notes

Verify the specific suffix 'R' indicates the 28-lead Small Outline Integrated Circuit (SOIC) package configuration. Confirm that the 'A' grade designation meets the required integral nonlinearity specifications for your application. Ensure compatibility with the 3 V to 5.5 V supply range before integration into the final design.

Selection Notes

Select the AD7854AR when a 200 kSPS sampling rate is required alongside low power consumption. Choose this model over the AD7854L variant if higher speed performance is prioritized over minimal power usage. Ensure the system can accommodate the 28-lead SOIC footprint and provides the necessary parallel interface signals for control and data retrieval.

Part Context

This component belongs to the AD7854 family of 12-bit sampling ADCs designed for general-purpose data acquisition. The AD7854AR specifically denotes the standard speed version packaged in a 28-lead SOIC format. It serves as a bridge between analog sensor signals and digital processing units in embedded systems.

Replacement Considerations

The AD7854BR offers improved linearity error specifications while maintaining similar electrical characteristics. The AD7854LAR provides a lower power alternative suitable for battery-operated devices with reduced throughput requirements.