MAX1242BESA+T

Analog To Digital Converters (ADC) Overview

The MAX1242BESA+T is a low-power, 10-bit successive-approximation analog-to-digital converter (ADC) housed in an 8-pin SO package. It operates on a single +2.7V to +5.25V supply and features a 7.5µs conversion time with a maximum throughput rate of 73ksps. The device includes an internal 2.5V reference and a fast track/hold circuit with a 1.5µs acquisition time. Power consumption is 3mW at full speed, reducible to 5µW via shutdown mode. It utilizes a high-speed, 3-wire serial interface compatible with SPI, QSPI, and MICROWIRE protocols.

Analog To Digital Converters (ADC) Feature Summary

• Integrated 2.5V voltage reference for simplified system design
• Fast track/hold architecture supporting high-speed transient digitization
• Low power operation with dedicated shutdown mode for extended battery life
• Flexible serial interface compatible with standard microcontroller ports

Analog To Digital Converters (ADC) Applications

• Portable data logging systems
• Process control monitoring
• Temperature measurement circuits
• Isolated data acquisition modules

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'E' indicates the -40°C to +85°C operating temperature range and 'SA' denotes the SOIC-8 narrow package. Confirm the '+' suffix ensures lead-free and RoHS compliance as per manufacturer standards. Cross-reference the ordering information table to ensure the selected part matches the required integral nonlinearity specification for the application.

Analog To Digital Converters (ADC) Selection Notes

Select the MAX1242 variant when an integrated 2.5V reference is preferred to minimize external component count. Choose the MAX1243 if an external reference voltage is required or if the internal reference must be disabled via the SHDN pin. Ensure the source impedance remains below 4kΩ to maintain specified AC performance without additional input filtering capacitors.

Analog To Digital Converters (ADC) Part Context

This component belongs to the MAX124x family of low-power serial ADCs. It serves as a 10-bit counterpart to the 12-bit MAX1240/MAX1241 series. The MAX1242 differs from the MAX1243 primarily by its inclusion of an on-chip voltage reference, whereas the MAX1243 requires an external reference source connected to the REF pin.

Analog To Digital Converters (ADC) Replacement Considerations

The MAX1242A is the commercial grade equivalent to the MAX1242C. For industrial temperature ranges, the MAX1242AEPA+ offers a PDIP option. Pin-compatible upgrades include the 12-bit MAX1240 and MAX1241 series, which share the same package footprint and interface timing characteristics.

Analog To Digital Converters (ADC) FAQ

How does the SHDN pin affect the internal reference?

Pulling the SHDN pin high enables the internal 2.5V reference. Leaving the SHDN pin open disables the internal reference, allowing the use of an external reference voltage.

What is the minimum acquisition time for the track/hold circuit?

The minimum acquisition time is 1.5µs. This duration may increase if the analog input source impedance exceeds 4kΩ.

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

At least 13 falling clock edges are needed to shift out the 10 data bits, one leading high bit, and two sub-bits. Extra clock pulses produce trailing zeros.