AD7854LARZ-REEL

Overview

The AD7854LARZ-REEL is a 12-bit, 100 kSPS sampling analog-to-digital converter from Analog Devices Inc. It operates on a single 3 V to 5.5 V supply and features a pseudo-differential input range of 0 V to VREF (unipolar) or ±VREF/2 (bipolar). The device includes self-calibration and system calibration capabilities to maintain accuracy over temperature and time. Power consumption is typically 5.4 mW in normal operation at 3 V, with automatic power-down reducing dissipation to 650 µW at 10 kSPS. It utilizes a flexible parallel interface compatible with 8-bit and 16-bit data buses via the HBEN pin.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure long-term accuracy without external trimming.
• Flexible parallel I/O interface supports both 8-bit and 12-bit data transfers through High Byte Enable control.
• Multiple power management modes allow optimization for speed or low-power applications, including automatic shutdown after conversion.

Applications

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

Procurement Notes

Verify the specific suffix 'R' indicates the SOIC-28 package and 'E' denotes tape-and-reel packaging when sourcing this component. Confirm that the AD7854L variant meets the required 100 kSPS throughput specification for your application, as the standard AD7854 offers higher speed. Ensure voltage levels match the 3 V to 5.5 V operational range defined in the datasheet.

Selection Notes

Select the AD7854LARZ-REEL when a balance of moderate speed and low power consumption is required. The L-version is optimized for lower power dissipation compared to the standard AD7854. Consider the bipolar input capability if negative signal swings are present. Verify that the 12-bit resolution and integral nonlinearity specifications meet the system accuracy requirements before finalizing the design.

Part Context

This component belongs to the AD7854 family of high-speed, low-power 12-bit ADCs. The AD7854L variant specifically targets low-power applications while maintaining 100 kSPS performance. It shares architectural similarities with other SAR ADCs but distinguishes itself through integrated calibration and flexible power-down options suitable for battery-operated environments.

Replacement Considerations

The AD7854AR serves as a higher-speed alternative offering 200 kSPS throughput. For direct functional substitution within the same package, verify compatibility with the AD7854BR which offers improved linearity. Ensure any replacement maintains the 12-bit resolution and compatible parallel interface timing characteristics.