MAX188ACWP

ADCs/DACs - Special Purpose Overview

The MAX188ACWP 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. The device operates on a single +5V or dual ±5V supply and supports software-configurable unipolar/bipolar and single-ended/differential inputs. 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 input channels
• Requires external reference voltage at VREF pin; internal reference buffer available
• Low power consumption: 1.5mA operating mode, 2µA power-down mode
• Internal track/hold with 133ksps sampling rate using internal clock

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify package type and temperature grade. The 'W' suffix indicates a 20-pin SOIC package. The 'A' grade specifies tighter accuracy parameters compared to C or D grades. Confirm RoHS compliance status based on the specific ordering suffix variant, as standard parts may differ from lead-free versions.

ADCs/DACs - Special Purpose Selection Notes

Select the MAX188 over the MAX186 when an external precision reference is required for system calibration. Ensure the external reference voltage is stable at 4.096V for optimal performance. Verify that the application can accommodate the serial interface timing requirements, specifically the 15-clock conversion cycle in 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 architecture and pinout as the MAX186 but differs in reference configuration. The MAX186 includes an internal 4.096V reference, while the MAX188 relies on an external source. Both devices offer similar power management features and serial compatibility.

ADCs/DACs - Special Purpose Replacement Considerations

The MAX186 is a functional substitute if an internal reference is acceptable. Other 12-bit serial ADCs from Maxim or Analog Devices may require interface and pinout adjustments. Verify electrical characteristics such as input voltage range and power consumption against the new component's datasheet.