MAX187CEWE

Analog To Digital Converters (ADC) Overview

The MAX187CEWE+ is a +5V, low-power, 12-bit serial analog-to-digital converter (ADC) manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +5V supply and accepts a 0 to 5V analog input. The device features an internal track/hold circuit with a 1.5µs acquisition time and achieves a throughput rate of 75ksps. It incorporates an on-chip clock and a high-speed 3-wire serial interface compatible with SPI, QSPI, and MICROWIRE protocols. The MAX187 includes an internal buffered reference voltage of 4.096V. Power consumption is specified at 7.5mW in normal operation, reducing to 10µA in shutdown mode. The component is housed in a 16-pin SO package.

Analog To Digital Converters (ADC) Feature Summary

• Integrated successive-approximation register (SAR) architecture with an internal track/hold circuit for signal sampling.
• Built-in buffered temperature-compensated bandgap reference providing a stable 4.096V output.
• Three-wire serial interface supporting standard digital communication protocols without external hardware.
• Low power consumption with a dedicated shutdown mode accessible via the SHDN pin.

Analog To Digital Converters (ADC) Applications

• Portable data logging systems
• Remote digital signal processing units
• Isolated data acquisition circuits
• High-accuracy process control instrumentation

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'E' indicates the extended industrial temperature range (-40°C to +85°C). Confirm the 'WE+' designation corresponds to the 16-pin Wide SO package and RoHS compliance status. Cross-reference the manufacturer's ordering guide to ensure compatibility with current production revisions and lead times.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a 12-bit resolution and 75ksps throughput are required within a single +5V supply system. Choose the MAX187 variant specifically if an integrated 4.096V reference is preferred over an external one. Ensure the application supports the 3-wire serial interface timing requirements and that the input signal impedance remains below 5kΩ for optimal acquisition performance.

Analog To Digital Converters (ADC) Part Context

This part belongs to the MAX187/MAX189 family of low-power serial ADCs. While the MAX189 requires an external reference, the MAX187 integrates a buffered reference to save board space. Both share identical architectures and interfaces but differ in reference configuration and specific accuracy grades defined by their suffixes.

Analog To Digital Converters (ADC) Replacement Considerations

Public confirmed substitute part numbers: MAX187BEWE+

Analog To Digital Converters (ADC) FAQ

How is the internal reference enabled or disabled on the MAX187?

The internal reference is enabled by pulling the SHDN pin high. To disable it and use an external reference, leave the SHDN pin floating.

What is the maximum serial clock frequency supported by the device?

The SCLK input supports clock frequencies up to 5MHz, allowing data to be shifted out at rates up to this limit.

How does the device indicate the end of conversion?

The DOUT pin transitions from logic low to logic high to signal the end of conversion (EOC), which can be used as a framing signal before shifting out the data bits.