MAX186AEWP

ADCs/DACs - Special Purpose Overview

The MAX186AEWP+ is a low-power, 8-channel, serial 12-bit analog-to-digital converter (ADC) from Analog Devices/Maxim Integrated. It integrates an 8-channel multiplexer, high-bandwidth track/hold circuitry, and a successive-approximation architecture with a 4-wire serial interface. The device operates on a single +5V or dual ±5V supply, consuming 1.5mA in operating mode and under 10µA when powered down between conversions. Key electrical specifications include a 133ksps sampling rate, internal 4.096V reference, and SPI/QSPI/MICROWIRE compatibility. It is housed in a 20-pin SO package and supports software-configurable unipolar/bipolar and single-ended/differential inputs.

ADCs/DACs - Special Purpose Feature Summary

• 12-bit resolution with 8 single-ended or 4 differential analog input channels
• Internal 4.096V reference voltage and reference-buffer amplifier for gain trim simplification
• Ultra-low power consumption: 1.5mA operating current, reducible to <10µA via power-down modes
• Flexible 4-wire serial interface compatible with SPI, QSPI, MICROWIRE, and TMS320 DSPs

ADCs/DACs - Special Purpose Applications

• Portable data logging systems
• High-accuracy process control instrumentation
• Battery-powered medical instruments
• Automatic testing equipment

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific grade suffix 'A' against the manufacturer's ordering information, as performance parameters such as linearity and offset error vary by grade. Confirm the package type corresponds to the 'W' designation for the 20-pin shrink small-outline package. Ensure that the required temperature range (-40°C to +85°C for the 'E' grade variant) aligns with the application environment, noting that the datasheet lists 'E' grade for this extended range while 'C' grade covers 0°C to +70°C.

ADCs/DACs - Special Purpose Selection Notes

Select the MAX186AEWP+ when an integrated internal reference is required, distinguishing it from the MAX188 which needs an external reference. Evaluate source impedance constraints, as acquisition time increases with higher impedance; keep source impedance below 5kΩ for optimal AC performance without additional input capacitors. Consider the internal clock mode for applications where the microprocessor cannot guarantee continuous serial clocking during conversion, ensuring the total conversion time does not exceed 120µs to prevent sample-and-hold droop.

ADCs/DACs - Special Purpose Part Context

The MAX186AEWP+ belongs to the MAX186/MAX188 family of low-power, serial 12-bit ADCs. This series combines data-acquisition functions including multiplexing and tracking into a single chip. The 'A' grade indicates specific DC accuracy and dynamic performance limits defined in the electrical characteristics table. The component is designed to replace parallel interface ADCs by reducing pin count and external logic requirements through its serial interface capability.

ADCs/DACs - Special Purpose Replacement Considerations

The MAX188 serves as a functional alternative if an external reference voltage is preferred or required for the design. For applications requiring a parallel interface instead of serial communication, the MAX180 or MAX181 families are the designated counterparts within the product line.