MAX11158EUB+

Analog To Digital Converters (ADC) Overview

The MAX11158EUB+ is an 18-bit, 500ksps successive approximation register (SAR) analog-to-digital converter. It features a true bipolar input range of ±5V while operating from a single 5V analog supply and a separate 2.3V to 5V digital supply. The device integrates a low-drift internal reference with a buffer, achieving 93.7dB SNR and -100.0dB THD at 10kHz. It guarantees 18-bit no-missing codes with typical INL of ±2.7 LSB and DNL of ±0.5 LSB. Communication occurs via an SPI-compatible serial interface supporting daisy-chaining and busy indicators.

Analog To Digital Converters (ADC) Feature Summary

• Patented charge-pump architecture enables direct sampling of high-impedance sources without external buffering.
• Integrated precision internal reference with buffer eliminates the need for external components.
• Supports multiple serial interface modes including CS and daisy-chain configurations with optional busy indicator.

Analog To Digital Converters (ADC) Applications

• Industrial Process Control
• Data Acquisition Systems
• Medical Instrumentation
• Automatic Test Equipment

Analog To Digital Converters (ADC) Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or certified partners. Request original manufacturer datasheets and RoHS compliance documentation upon inquiry. Confirm package integrity and pin alignment against the 10-pin µMAX specification before integration into production workflows.

Analog To Digital Converters (ADC) Selection Notes

Select this component when bipolar ±5V input signals must be digitized directly using a single 5V supply. Ensure the driving source impedance remains below 1kΩ for optimal settling within the 500ns acquisition window. Verify that the host controller supports the required SPI timing parameters for the chosen interface mode.

Analog To Digital Converters (ADC) Part Context

This part belongs to the MAX11158 family of 18-bit SAR ADCs. It is distinguished by its ±5V input capability and integrated reference, unlike the MAX11168 which offers 16-bit resolution, or the MAX11150 which accepts 0V to 5V inputs. It shares the compact 10-pin µMAX package form factor common to this series.

Analog To Digital Converters (ADC) Replacement Considerations

Direct functional substitutes include the MAX11168 for 16-bit applications or the MAX11150 for unipolar requirements. Cross-referencing pinouts and thermal characteristics is essential when replacing these variants in existing designs.

Analog To Digital Converters (ADC) FAQ

How does the MAX11158 handle overvoltage conditions on the analog inputs?

The device includes input clamping circuits that activate if AIN+ exceeds VDD + 300mV or drops below -(VDD + 300mV). These clamps remain high-impedance within normal operation but limit voltage during faults to protect the internal circuitry.

What determines the selection between CS and daisy-chain interface modes?

The logic level of the SDI pin during the rising edge of the CNVST signal determines the mode. If SDI is high, CS mode is selected; if SDI is low, daisy-chain mode is enabled.

Is an external buffer amplifier required for all input sources?

An external buffer is recommended if the source impedance causes significant settling errors within the 500ns acquisition period. Direct driving is suitable for source impedances less than 1kΩ.