MAX147BCAP+T

Analog To Digital Converters (ADC) Overview

The MAX147BCAP+T is a low-power, serial 12-bit analog-to-digital converter (ADC) from the MAX146/MAX147 family. It integrates an 8-channel multiplexer, high-bandwidth track/hold circuit, and successive-approximation conversion logic. The device operates on a single +2.7V to +5.25V supply and requires an external reference voltage. It features a 4-wire serial interface compatible with SPI, QSPI, and Microwire protocols. Key electrical specifications include a resolution of 12 bits, a maximum sampling rate of 133 kS/s, and a supply current of 1.2 mA at full power. The component is housed in a 20-pin SSOP package and supports an operating temperature range of 0°C to +70°C.

Analog To Digital Converters (ADC) Feature Summary

• Integrates an 8-channel analog multiplexer with software-configurable unipolar or bipolar input modes.
• Features a flexible 4-wire serial interface that connects directly to standard microprocessor protocols without external logic.
• Supports rapid power-down transitions, allowing automatic shutdown between conversions to minimize average supply current.
• Includes a reference-buffer amplifier with a ±1.5% voltage-adjustment range for external reference applications.

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 'C' indicates the commercial temperature grade (0°C to +70°C) and 'AP' denotes the SSOP-20 package. Confirm the '+T' suffix corresponds to tape-and-reel packaging if required by assembly equipment. Ensure the external reference voltage matches the datasheet requirement of 2.5V for optimal performance. Cross-reference the manufacturer's latest documentation for any discontinuation notices or lifecycle status changes.

Analog To Digital Converters (ADC) Selection Notes

Select this model when an external reference voltage is preferred over an internal one, as the MAX147 variant lacks an integrated reference unlike the MAX146. Ensure the application requires a 12-bit resolution with up to 8 single-ended channels. Verify that the system can accommodate the 20-pin SSOP footprint and that the serial clock frequency remains within the 2.0 MHz limit for specified timing characteristics.

Analog To Digital Converters (ADC) Part Context

This component belongs to the MAX146/MAX147 series of low-power, serial 12-bit ADCs. The MAX147 differs from the MAX146 primarily by requiring an external reference voltage rather than utilizing an internal 2.5V reference. Both devices share identical architecture, including the 8-channel multiplexer and SAR conversion engine. The MAX147 offers flexibility for applications where a precise external reference source is already available in the design.

Analog To Digital Converters (ADC) Replacement Considerations

The MAX146ACAP+T serves as a functional substitute if an internal reference is acceptable. For higher channel counts, consider the MAX1246/MAX1247 series which provides 4-channel versions. Verify pin compatibility and software register configurations when transitioning between these related parts.