AD7853LANZ

Overview

The AD7853LANZ is a single-channel, 12-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices. 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 range of 0 V to VREF or bipolar ±VREF/2, selectable via the AMODE pin. It includes an internal 2.5 V reference and offers flexible serial interface compatibility with SPI, QSPI, Microwire, and 8051 protocols. Power consumption is optimized for low-power applications, typically dissipating 6.85 mW at 3 V.

Feature Summary

• Integrated self-calibration and system calibration capabilities that automatically initialize upon power-up to maintain accuracy over time and temperature variations.
• Flexible serial communication interface supporting multiple standard protocols including SPI, QSPI, Microwire, and microprocessor modes.
• Automatic power-down functionality that activates after each conversion cycle to minimize energy usage in battery-operated systems.
• Pseudo-differential analog input architecture allowing for versatile signal conditioning and noise rejection.

Applications

• Battery-powered portable instruments such as personal digital assistants and medical devices
• Pen computers and mobile communication equipment requiring low power consumption
• Industrial instrumentation and control systems needing precise data acquisition

Procurement Notes

Verify the specific grade and package variant when ordering, as the AD7853LANZ designation indicates a particular linearized version within the family. Confirm that the required throughput and power specifications align with the L-series characteristics rather than the standard AD7853. Ensure that the application circuit accommodates the necessary external reference capacitors and serial interface timing requirements specified in the datasheet.

Selection Notes

Select the AD7853LANZ when a balance between moderate speed and ultra-low power consumption is required. This L-version variant is specifically optimized for lower power dissipation compared to the standard AD7853, making it suitable for battery-operated applications. Consider the 12-bit resolution and pseudo-differential inputs if system-level calibration is needed to correct for offset and gain errors in the signal chain.

Part Context

The AD7853LANZ belongs to the AD7853/AD7853L family of high-speed, low-power sampling ADCs. While the standard AD7853 supports up to 200 kSPS, the AD7853L variant, which includes the LANZ suffix, is optimized for lower power operation with a maximum throughput of 100 kSPS. Both variants share the same 12-bit resolution, serial interface options, and calibration features, differing primarily in power performance and clock speed limits.

Replacement Considerations

The AD7853LARSZ is a direct functional substitute within the same family, offering identical 100 kSPS performance and low-power characteristics but housed in a 24-lead SSOP package instead of the DIP configuration implied by the LANZ suffix. Verify package compatibility and pin-out alignment before substitution.