MAX145ACUA+T

Analog To Digital Converters (ADC) Overview

The MAX145ACUA+T is a low-power, 12-bit analog-to-digital converter (ADC) from Analog Devices Inc./Maxim Integrated. It features a single pseudo-differential input channel and operates on a +2.7V to +5.25V supply. The device utilizes a successive-approximation register (SAR) architecture with an internal track-and-hold circuit, achieving a maximum sampling rate of 108ksps. Power consumption is 3.2mW at full speed, dropping to 0.2µA in shutdown mode. It includes an on-chip clock and communicates via a high-speed, 3-wire serial interface compatible with SPI, QSPI, and MICROWIRE standards.

Analog To Digital Converters (ADC) Feature Summary

• Single pseudo-differential input channel for precise signal acquisition
• Ultra-low power operation with automatic power-down capabilities
• Integrated track-and-hold stage and on-chip oscillator
• Flexible 3-wire serial interface supporting multiple standard protocols

Analog To Digital Converters (ADC) Applications

• Battery-powered portable systems
• Portable data logging equipment
• Isolated data acquisition modules
• Process-control monitoring circuits
• Medical instrumentation devices

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when sourcing this component. Confirm that the AC temperature range aligns with your operational environment requirements. Ensure the external reference voltage meets the specified load current demands during conversion cycles to maintain accuracy.

Analog To Digital Converters (ADC) Selection Notes

Select the MAX145 variant over the MAX144 if a pseudo-differential input configuration is required rather than dual single-ended channels. Consider the internal clock mode for simplified microprocessor interfacing where strict timing synchronization is not critical. Evaluate source impedance constraints to ensure adequate acquisition time within the specified performance envelope.

Analog To Digital Converters (ADC) Part Context

This component belongs to the MAX144/MAX145 family of low-power, 12-bit ADCs. It shares architectural similarities with other Maxim integrated converters but is distinguished by its specific input topology and package options. The device is designed for applications demanding high resolution in space-constrained, battery-operated environments.

Analog To Digital Converters (ADC) Replacement Considerations

Pin-compatible 10-bit versions such as the MAX157 and MAX159 are available. Verify that the reduced resolution of these alternatives meets the system's accuracy requirements before substitution.

Analog To Digital Converters (ADC) FAQ

How does the MAX145 handle differential inputs?

The MAX145 accepts pseudo-differential inputs where CH+ is sampled while CH- must remain stable relative to ground within ±0.5LSB during conversion.

What is the wake-up time from shutdown mode?

The device has a typical wake-up time of 2.5µs, provided the external reference voltage is stable within 1LSB.

Can the device operate without an external clock?

Yes, the MAX145 includes an internal laser-trimmed oscillator that allows it to run independently of an external clock source.