MAX189CEWE

Analog To Digital Converters (ADC) Overview

The MAX189CEWE+ 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 VREF analog input range. The device features an 8.5µs successive-approximation ADC, a fast track/hold circuit with a 1.5µs acquisition time, an on-chip clock, and a high-speed 3-wire serial interface compatible with SPI, QSPI, and MICROWIRE protocols. The MAX189 requires an external reference voltage applied to the REF pin, unlike the MAX187 which includes an internal reference. It digitizes signals at a throughput rate of 75ksps. Power consumption is 7.5mW in operating mode and reduces to 10µA in shutdown.

Analog To Digital Converters (ADC) Feature Summary

• 12-Bit Resolution
• Internal Track/Hold, 75kHz Sampling Rate
• Single +5V Operation
• Low Power: 2µA Shutdown Current, 1.5mA Operating Current
• 3-Wire Serial Interface, Compatible with SPI, QSPI, and MICROWIRE
• Small-Footprint 8-Pin PDIP and 16-Pin SO

Analog To Digital Converters (ADC) Applications

• Portable Data Logging
• Remote Digital Signal Processing
• Isolated Data Acquisition
• High-Accuracy Process Control

Analog To Digital Converters (ADC) Procurement Notes

Verify that the specific part number corresponds to the commercial temperature range (0°C to +70°C) as indicated by the 'C' suffix. Confirm the package type matches the required board layout, typically 16-pin Wide SO for this variant. Ensure the design accommodates the requirement for an external reference voltage source connected to the REF pin, as the MAX189 does not include an internal reference buffer like the MAX187.

Analog To Digital Converters (ADC) Selection Notes

Select the MAX189CEWE+ when an external precision reference is preferred or already available in the system architecture. This component is suitable for applications requiring low power consumption and small footprint. Compare against the MAX187 if an integrated internal reference is desired to simplify the design. Consider the 12-bit resolution and 75ksps throughput for data acquisition needs.

Analog To Digital Converters (ADC) Part Context

The MAX189 is part of the MAX187/MAX189 family of low-power, 12-bit serial ADCs. Both devices share similar architectures and performance characteristics, including the SAR conversion method and serial interface. The primary distinction lies in the reference configuration; the MAX189 relies on an external reference, offering flexibility in setting the full-scale input range, whereas the MAX187 integrates a buffered 4.096V reference.

Analog To Digital Converters (ADC) Replacement Considerations

MAX187CEWE+