MAX188AEPP+

ADCs/DACs - Special Purpose Overview

The MAX188AEPP+ is a low-power, 8-channel, serial 12-bit analog-to-digital converter (ADC) in a 20-pin PDIP package. It integrates an 8-channel multiplexer, high-bandwidth track/hold circuit, and successive-approximation conversion logic. Operating on a single +5V or dual ±5V supply, it supports software-configurable unipolar/bipolar and single-ended/differential inputs. The device features a 4-wire serial interface compatible with SPI, QSPI, and MICROWIRE protocols. Key electrical parameters include a 133 kS/s sampling rate, 70 dB SNR, ±1 LSB DNL, and ±0.5 LSB INL. Power consumption is 1.5 mA in operating mode and drops to under 10 µA in power-down modes.

ADCs/DACs - Special Purpose Feature Summary

• 8-channel multiplexer with software-selectable single-ended or differential input configurations
• 12-bit resolution with 133 kS/s sampling rate using internal clock or external serial clock
• Requires external reference voltage applied to VREF pin; includes reference-buffer amplifier for gain trim
• Low power consumption: 1.5 mA operating current, reducible to <10 µA via software-selectable power-down modes

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify the 'A' grade designation ensures specific DC accuracy limits (±0.5 LSB INL, ±1 LSB DNL). Confirm the PDIP-20 through-hole package matches the PCB footprint. Ensure the design accommodates the requirement for an external precision reference voltage at the VREF pin, as this variant lacks an internal reference unlike the MAX186.

ADCs/DACs - Special Purpose Selection Notes

Select the MAX188AEPP+ when an external reference is preferred or required for system calibration, distinguishing it from the MAX186 which contains an internal 4.096V reference. The 'E' suffix indicates operation over the extended industrial temperature range of -40°C to +85°C. Verify that the application can support the 4-wire serial interface timing requirements or utilizes the internal clock mode for simplified microprocessor interfacing.

ADCs/DACs - Special Purpose Part Context

This component belongs to the MAX186/MAX188 family of low-power, 8-channel, serial 12-bit ADCs manufactured by Analog Devices / Maxim Integrated. The MAX188 variant is specifically defined by its requirement for an external reference voltage, whereas the MAX186 integrates an internal reference. Both share identical architecture, pinouts, and performance characteristics except for the reference source.

ADCs/DACs - Special Purpose Replacement Considerations

The MAX186AEPP+ is a direct functional substitute if the system design permits use of the internal 4.096V reference instead of an external one. Other members of the MAX18x family may offer different packages (SO, SSOP) but require verification of pin compatibility and reference configuration.