MAX188DCWP

ADCs/DACs - Special Purpose Overview

The MAX188DCWP is a 12-bit, 8-channel analog-to-digital converter (ADC) from Maxim Integrated. It integrates an 8-channel multiplexer, high-bandwidth track/hold circuit, and serial interface for data acquisition. The device operates on a single +5V or dual ±5V supply and supports software-configurable unipolar/bipolar and single-ended/differential input modes. Unlike the MAX186, the MAX188 requires an external reference voltage applied to the VREF pin. It features a 4-wire serial interface compatible with SPI, QSPI, and Microwire protocols, enabling direct connection to microprocessors without external logic.

ADCs/DACs - Special Purpose Feature Summary

• 12-bit resolution with 8 single-ended or 4 differential analog inputs
• Internal track/hold with 133ksps sampling rate using internal clock
• Software-selectable power-down modes reducing current to under 10µA
• 4-wire serial interface compatible with SPI, QSPI, and Microwire

ADCs/DACs - Special Purpose Applications

• Portable Data Logging
• Data-Acquisition Systems
• High-Accuracy Process Control
• Automatic Testing Equipment
• Battery-Powered Instruments

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific grade suffix in the part number against the manufacturer's ordering information to confirm temperature range and accuracy class. Ensure the package type matches the design requirements, as the MAX188 family is available in PDIP, SO, and SSOP packages. Confirm that the selected variant includes lead-free/RoHS compliance if required by the application standards.

ADCs/DACs - Special Purpose Selection Notes

Select the MAX188 over the MAX186 when an external precision voltage reference is preferred or required for the system. Verify that the external reference provides 4.096V for optimal performance. Check that the source impedance of the analog inputs is low enough to meet the 1.5µs acquisition time requirement, or add input capacitors if necessary. Ensure the serial clock frequency allows conversion completion within 120µs when using external clock mode.

ADCs/DACs - Special Purpose Part Context

The MAX188 is part of the MAX186/MAX188 family of low-power, serial 12-bit ADCs. It shares the same core architecture, pinout, and functionality as the MAX186, with the primary distinction being the reference configuration. While the MAX186 includes an internal 4.096V reference, the MAX188 relies on an external reference source connected to the VREF pin. Both devices offer identical channel counts, sampling rates, and serial interface capabilities.

ADCs/DACs - Special Purpose Replacement Considerations

The MAX186 is a functional substitute if the system can accommodate its internal reference or if the reference buffer gain differences are accounted for. Other members of the MAX18x family may be considered if pin compatibility and interface requirements match.