MAX1238MEEE+T

Analog To Digital Converters (ADC) Overview

The MAX1238MEEE+T is a low-power, 12-bit analog-to-digital converter (ADC) featuring 12 analog input channels. It utilizes successive-approximation (SAR) architecture with an internal track/hold circuit and operates from a single supply voltage of 4.5V to 5.5V. The device integrates a 4.096V internal reference and supports I2C-compatible serial communication at rates up to 1.7MHz. It achieves a maximum sampling rate of 94.4ksps with a typical supply current of 670µA. The component is housed in a 16-pin QSOP package and is guaranteed to operate within an extended temperature range of -40°C to +85°C.

Analog To Digital Converters (ADC) Feature Summary

• Integrates a fully differential analog-input multiplexer and track-and-hold circuitry for accurate signal acquisition.
• Supports software-configurable unipolar or bipolar operation for both single-ended and differential input modes.
• Features AutoShutdown technology that powers down the device between conversions to minimize power consumption.
• Includes an internal FIFO buffer to facilitate channel-scan mode operations.

Analog To Digital Converters (ADC) Applications

• Handheld portable applications
• Medical instruments
• Battery-powered test equipment
• Solar-powered remote systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix to confirm the tape-and-reel packaging configuration associated with the 'T' designation. Confirm RoHS compliance status and lead-free material specifications against the manufacturer's latest documentation before procurement.

Analog To Digital Converters (ADC) Selection Notes

Select this part when a 12-channel ADC is required alongside a 4.5V to 5.5V supply rail. Ensure the system design accommodates the 4.096V internal reference voltage. Verify that the host microcontroller supports the required I2C clock speeds for the desired throughput rate.

Analog To Digital Converters (ADC) Part Context

This component belongs to the MAX1236–MAX1239 family of low-power, 12-bit multichannel ADCs. While the MAX1236 and MAX1237 feature four channels and operate on lower voltages, the MAX1238 specifically provides twelve channels optimized for 5V systems. It shares pinout compatibility with the MAX1239 but differs in supply voltage requirements and internal reference values.

Analog To Digital Converters (ADC) Replacement Considerations

The MAX1238KEEE+ is a verified alternative offering identical electrical characteristics and pinout within the same product family.

Analog To Digital Converters (ADC) FAQ

How does the MAX1238 handle high source impedances?

For source impedances exceeding 1.5kΩ, connect a 100pF capacitor from the analog input to ground to form an RC filter. For significantly higher impedances, use a buffer amplifier to maintain signal integrity.

What is the mechanism for entering High-Speed Mode?

The bus master must address all devices with the HS-mode master code (0000 1XXX). Upon receiving this code, the device issues a not-acknowledge, after which the master sends a repeated START followed by the slave address to initiate HS-mode communication.

Can the MAX1238 operate in bipolar mode with single-ended inputs?

No. In single-ended mode, the device always operates in unipolar mode regardless of the BIP/UNI bit setting. Bipolar operation is only available when the device is configured for differential inputs.