MAX188AEWP

ADCs/DACs - Special Purpose Overview

The MAX188AEWP+ is a 12-bit, low-power data-acquisition system featuring an 8-channel multiplexer and high-bandwidth track/hold circuit. It operates on a single +5V or dual ±5V supply with software-configurable unipolar/bipolar inputs. The device utilizes a 4-wire serial interface compatible with SPI, QSPI, Microwire, and TMS320 DSPs. Unlike the MAX186, the MAX188 requires an external reference voltage applied to the VREF pin. It supports internal or external clocking for successive-approximation conversions at up to 133ksps.

ADCs/DACs - Special Purpose Feature Summary

• 12-bit resolution with 8 single-ended or 4 differential analog inputs
• 133kHz sampling rate with internal track/hold circuit
• Software-selectable power-down modes reducing current to 2µA
• External reference input requirement (no internal reference)

ADCs/DACs - Special Purpose Applications

• Portable Data Logging
• High-Accuracy Process Control
• Medical Instruments

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'AEWP' against official ordering tables. The datasheet lists grades A, B, C, and D with temperature ranges of 0°C to +70°C (C) or -40°C to +85°C (E). Confirm package availability, as A-grade parts in SSOP packages may require factory contact. Ensure RoHS compliance by checking for the '+' designation in the final part number.

ADCs/DACs - Special Purpose Selection Notes

Select the MAX188 over the MAX186 when an external precision reference is preferred or required for the application. Verify that the external reference voltage is set to 4.096V for optimal performance specifications. Ensure the serial interface timing meets the 133ksps requirement if using external clock mode, or utilize internal clock mode for processor-independent operation.

ADCs/DACs - Special Purpose Part Context

The MAX188 is part of the MAX186/MAX188 family of low-power, serial 12-bit ADCs. It shares identical architecture, pinout, and performance characteristics with the MAX186, differing primarily in the reference source. The MAX186 includes an internal 4.096V reference, while the MAX188 relies on an external reference connected to the VREF pin.

ADCs/DACs - Special Purpose Replacement Considerations

The MAX186 is a functional substitute if the application can accommodate its internal reference or if the reference buffer gain differences are accounted for. Other Maxim Integrated 12-bit serial ADCs should be evaluated for pin compatibility and interface requirements.