MAX1240AESA

Analog To Digital Converters (ADC) Overview

The MAX1240AESA is a low-power, 12-bit successive-approximation analog-to-digital converter (ADC) housed in an 8-pin SO package. It operates on a single +2.7V to +3.6V supply and features an internal 2.5V reference. The device supports a maximum sampling rate of 73ksps with a conversion time of 7.5µs. It utilizes a high-speed, 3-wire serial interface compatible with SPI, QSPI, and MICROWIRE protocols. Key electrical parameters include a signal-to-noise ratio of 70dB, a full-scale input range from 0V to VREF, and an operating temperature range of -40°C to +85°C.

Analog To Digital Converters (ADC) Feature Summary

• Integrates a 12-bit SAR ADC with an internal track/hold circuit and on-chip clock for simplified system design.
• Features a built-in 2.5V voltage reference that can be enabled or disabled via the SHDN pin to allow external reference usage.
• Provides a flexible 3-wire serial interface compatible with standard microcontroller ports and multiple communication protocols.
• Includes a dedicated shutdown mode to significantly reduce power consumption during idle periods.

Analog To Digital Converters (ADC) Applications

• Battery-powered portable systems requiring extended operational life
• Remote sensor data acquisition networks
• Isolated data acquisition modules
• Process control instrumentation

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'AESA/V+' against the manufacturer's current ordering guide to confirm the exact temperature grade and automotive qualification status. Ensure the required packaging format matches the project needs, as availability may vary between tube and reel configurations depending on the distributor source.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a 12-bit resolution and low power consumption are critical within a small footprint. The internal reference simplifies board layout compared to the MAX1241, which requires an external reference. Consider the 73ksps throughput limit and the specific serial interface timing requirements when integrating with the host microcontroller.

Analog To Digital Converters (ADC) Part Context

This part belongs to the MAX1240/MAX1241 family of low-power serial ADCs. The MAX1240 variant is distinguished by its integrated 2.5V reference, whereas the MAX1241 requires an external reference source. Both share identical architecture and performance characteristics regarding speed and resolution.

Analog To Digital Converters (ADC) Replacement Considerations

The MAX1240BEPA+ serves as a direct pin-compatible alternative in an 8-pin PDIP package. Verify that the package type change does not impact the mechanical constraints of the existing PCB design before substitution.

Analog To Digital Converters (ADC) FAQ

How is the internal reference of the MAX1240 controlled?

The internal 2.5V reference is enabled by pulling the SHDN pin high. Leaving the SHDN pin open disables the internal reference, allowing the REF pin to accept an external voltage source.

What is the minimum acquisition time for the analog input?

The minimum acquisition time (tACQ) is 1.5µs. This duration ensures the internal hold capacitor charges sufficiently based on the specified input impedance.

How many clock cycles are required to read the conversion result?

At least 13 falling clock edges are required to shift out the complete data stream, which consists of one leading end-of-conversion bit followed by 12 data bits.