MAX1231ACEG+

Analog To Digital Converters (ADC) Overview

The MAX1231ACEG+T is a 12-bit successive-approximation register (SAR) analog-to-digital converter (ADC) manufactured by Analog Devices Inc./Maxim Integrated. It features 16 configurable input channels supporting single-ended or differential inputs in unipolar or bipolar modes. The device operates on a +3V supply with a maximum sampling rate of 300ksps using an external clock and includes an internal 2.5V reference, an internal temperature sensor, and a 16-entry FIFO buffer. It utilizes a 10MHz SPI/QSPI/MICROWIRE-compatible serial interface and is housed in a 24-pin QSOP package.

Analog To Digital Converters (ADC) Feature Summary

• Integrated 16-entry first-in/first-out (FIFO) buffer for handling multiple internally clocked conversions without tying up the serial bus
• On-chip internal temperature sensor providing ±0.7°C accuracy at +25°C and ±2.5°C over the full operating range
• Analog multiplexer with true differential track/hold circuitry supporting both single-ended and fully differential input configurations
• AutoShutdown™ feature for low-power operation with shutdown current as low as 0.2µA

Analog To Digital Converters (ADC) Applications

• System Supervision
• Data-Acquisition Systems
• Industrial Control Systems
• Patient Monitoring
• Data Logging

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'EG' corresponds to the 24-pin QSOP package and the '+T' indicates tape-and-reel packaging when sourcing this component. Confirm that the 'C' grade designation aligns with the required commercial temperature range of 0°C to +70°C for your application environment. Ensure compatibility with the specified 2.7V to 3.6V supply voltage limits during procurement validation.

Analog To Digital Converters (ADC) Selection Notes

Select the MAX1231ACEG+T when 16 input channels are required, distinguishing it from the MAX1227 (8 channels) and MAX1229 (12 channels). Choose this part if the application demands a 12-bit resolution with a 300ksps sampling rate and integrated FIFO buffering. Verify that the 24-pin QSOP package fits the board layout constraints compared to the available TQFN option.

Analog To Digital Converters (ADC) Part Context

This component belongs to the MAX1227/MAX1229/MAX1231 family of 12-bit, 300ksps ADCs. While sharing identical core architecture, power requirements, and peripheral features like the internal reference and temperature sensor, the primary distinction lies in the number of available analog input channels. The MAX1231 represents the highest channel count variant within this specific series.

Analog To Digital Converters (ADC) Replacement Considerations

Public confirmed substitute part numbers: MAX1230ACEG+, MAX1231BCEG+

Analog To Digital Converters (ADC) FAQ

How does the MAX1231 handle data output when the FIFO buffer becomes full?

If the FIFO is filled and further conversions are requested without reading from the buffer, the oldest ADC results are overwritten by the new ADC results.

What is the resolution of the internal temperature sensor?

The internal temperature sensor provides a resolution of 1/8 of a degree Celsius.

Can the MAX1231 operate with an external reference voltage?

Yes, the device supports either the internal 2.5V reference or an external differential reference via the REF+ and REF- pins.