AD7853LARS

Overview

The AD7853LARS is a 12-bit, single-channel Successive Approximation Register (SAR) Analog-to-Digital Converter (ADC) manufactured by Analog Devices Inc. It operates from a single 3 V to 5.5 V supply and supports a maximum throughput rate of 100 kSPS. The device features a pseudo-differential input architecture with an acquisition time of 400 ns. It includes internal self-calibration and system calibration capabilities, which are automatically performed upon power-up. Power consumption is optimized for low-power applications, typically dissipating 6.85 mW at 3 V. The component utilizes a flexible serial interface compatible with SPI, QSPI, Microwire, and 8051 protocols, housed in a 24-lead SSOP package.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure accuracy over temperature variations and time.
• Flexible serial communication interface supporting multiple standard protocols including SPI and QSPI.
• Automatic power-down functionality following conversion cycles to minimize energy usage.
• Pseudo-differential analog input scheme allows for versatile signal conditioning configurations.

Applications

• Battery-powered personal digital assistants and mobile communications devices
• Medical instrumentation requiring low power consumption
• Pen computers and portable data acquisition systems
• High-speed modem applications

Procurement Notes

Verify the specific grade and temperature range requirements against the datasheet specifications before procurement. Confirm that the SSOP package dimensions align with the target PCB footprint. Ensure the design accommodates the required external reference capacitors as specified in the pin function descriptions. Check for any obsolete status or lifecycle notices associated with this specific part number variant.

Selection Notes

Select the AD7853L variant when lower power dissipation is prioritized over higher sampling speeds compared to the standard AD7853. Consider the 100 kSPS throughput limit when designing for high-frequency signal processing. Evaluate the need for external versus internal reference voltages based on system noise requirements. Verify compatibility with the host microcontroller's serial clock polarity and mode settings.

Part Context

This component belongs to the AD7853 family of 12-bit SAR ADCs from Analog Devices. The 'L' suffix denotes the low-power optimized version, while 'AR' indicates the SOIC/SSOP package type. The 'Z' suffix typically signifies lead-free compliance. This specific model represents the commercial grade variant designed for general-purpose data acquisition tasks within the specified voltage and temperature ranges.

Replacement Considerations

The AD7853LBR is a comparable low-power variant available in different packaging options. For higher speed requirements, the standard AD7853 series offers 200 kSPS performance. Direct pin-compatible replacements should be verified against the updated datasheets for timing and electrical parameter differences.