MAX1246BCEE+

Analog To Digital Converters (ADC) Overview

The MAX1246BCEE+ is a low-power, serial-output, 12-bit analog-to-digital converter (ADC) housed in a 16-pin QSOP package. It integrates a 4-channel multiplexer, high-bandwidth track/hold circuitry, and an internal 2.5V reference. Operating from a single +2.7V to +3.6V supply, it achieves sampling rates up to 133ksps with a typical supply current of 1.2mA. The device features software-configurable unipolar or bipolar inputs and supports SPI/QSPI/MICROWIRE interfaces. Key accuracy specifications include ±1 LSB INL and DNL, a signal-to-noise ratio of 70dB, and a small-signal bandwidth of 2.25MHz.

Analog To Digital Converters (ADC) Feature Summary

• Integrates a 4-channel analog multiplexer with a high-bandwidth track/hold circuit for efficient multi-point data acquisition.
• Features a built-in 2.5V voltage reference with a buffer amplifier that allows for ±1.5% voltage adjustment via the REFADJ pin.
• Supports flexible power management through hardware SHDN control and software-selectable fast or full power-down modes.
• Provides a 4-wire serial interface compatible with standard microprocessor protocols without requiring external logic.

Analog To Digital Converters (ADC) Applications

• Portable data logging systems
• Medical instruments
• Pen digitizers
• Battery-powered instruments

Analog To Digital Converters (ADC) Procurement Notes

Verify the component against official Analog Devices documentation to confirm the specific B-grade accuracy class and QSOP-16 packaging. Ensure the design accommodates the required +2.7V to +3.6V supply range and thermal dissipation limits for the plastic package. Cross-reference the ordering suffix to guarantee compatibility with the intended temperature range and performance specifications.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a compact 12-bit ADC with integrated multiplexing and reference is required for space-constrained designs. It is suitable for applications needing low power consumption during idle periods and software-configurable input ranges. Consider the MAX1247 variant if operation above 3.6V or an external reference is necessary.

Analog To Digital Converters (ADC) Part Context

This part belongs to the MAX1246/MAX1247 family of serial ADCs. The MAX1246 variant distinguishes itself by including an internal reference, whereas the MAX1247 requires an external one. Both share identical architectures but differ in supply voltage capabilities and reference configurations.

Analog To Digital Converters (ADC) Replacement Considerations

The MAX1247ACEE+ serves as a functional alternative within the same family, offering similar performance but requiring an external reference and supporting higher supply voltages up to 5.25V.

Analog To Digital Converters (ADC) FAQ

How does the MAX1246 handle differential input configurations?

In differential mode, the device samples the difference between two channels selected from pairs CH0/CH1 and CH2/CH3. This configuration is pseudo-differential, requiring the return side to remain stable within ±0.5LSB relative to AGND during conversion.

What is the function of the SHDN pin regarding the reference buffer?

Pulling the SHDN pin high places the reference-buffer amplifier into internal compensation mode. Leaving the pin floating configures the amplifier for external compensation mode.

Can the MAX1246 operate with an external clock frequency below 100kHz?

No, the datasheet recommends using internal clock mode if the serial clock frequency is less than 100kHz to prevent excessive droop on the sample-and-hold capacitors.