MAX147ACAP+

Analog To Digital Converters (ADC) Overview

The MAX147ACAP+ is a 12-bit successive-approximation analog-to-digital converter (ADC) featuring an 8-channel multiplexer and track/hold circuit. It operates on a single +2.7V to +5.25V supply with a sampling rate of 133ksps. The device uses a 4-wire serial interface compatible with SPI, QSPI, and Microwire standards. Unlike the MAX146, it requires an external reference voltage applied to the VREF pin. It supports software-configurable unipolar or bipolar inputs in both single-ended and differential modes. The component is housed in a 20-pin SSOP package and operates within a temperature range of 0°C to +70°C.

Analog To Digital Converters (ADC) Feature Summary

• Integrates an 8-channel analog multiplexer with high-bandwidth track/hold for efficient multi-point data acquisition.
• Features a flexible 4-wire serial interface that connects directly to standard microprocessor protocols without external logic.
• Supports software-selectable power-down modes to minimize current consumption during idle periods.
• Provides programmable input configurations for unipolar/bipolar and single-ended/differential signal processing.

Analog To Digital Converters (ADC) Applications

• Portable data logging systems
• Medical instruments
• Battery-powered instruments
• Process control

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'CAP+' indicates the commercial grade variant in the SSOP-20 package. Confirm the requirement for an external reference source, as this model lacks an internal reference unlike the MAX146 series. Ensure the design accommodates the +2.7V to +5.25V supply range and the 0°C to +70°C operating temperature limits.

Analog To Digital Converters (ADC) Selection Notes

Select the MAX147ACAP+ when an external reference voltage is preferred or required by the system architecture. This part is suitable for applications needing 8 channels of 12-bit resolution at moderate speeds. Consider the MAX146 if an integrated internal reference is desired instead. Verify that the host processor supports the required serial clock frequencies and timing constraints.

Analog To Digital Converters (ADC) Part Context

This component belongs to the MAX146/MAX147 family of low-power, serial data-acquisition systems. The MAX147 variant is distinguished by its support for higher supply voltages up to 5.25V and its reliance on an external reference voltage. It shares the same core SAR architecture and serial interface capabilities as the MAX146 but targets applications requiring broader supply flexibility.

Analog To Digital Converters (ADC) Replacement Considerations

The MAX146ACAP+ serves as a functional substitute if an internal reference is acceptable and the supply voltage remains below 3.6V. Other members of the MAX147 family, such as the MAX147AEPP+, offer different packages or extended temperature ranges but maintain similar electrical characteristics.

Analog To Digital Converters (ADC) FAQ

Does the MAX147ACAP+ include an internal voltage reference?

No, the MAX147 requires an external reference voltage applied to the VREF pin. The MAX146 is the variant in this family that includes an internal 2.5V reference.

What is the maximum supply voltage for the MAX147ACAP+?

The MAX147 operates from a single supply ranging from +2.7V to +5.25V.

How many analog input channels does the MAX147ACAP+ support?

It supports eight single-ended channels or four differential channel pairs via its internal multiplexer.