MAX1246ACEE+

Analog To Digital Converters (ADC) Overview

The MAX1246ACEE+ is a 12-bit successive-approximation analog-to-digital converter (ADC) featuring a 4-channel multiplexer and high-bandwidth track/hold circuit. It operates from a single +2.7V to +3.6V supply with an internal 2.5V reference. The device supports software-configurable unipolar or bipolar inputs and utilizes a 4-wire serial interface compatible with SPI, QSPI, and MICROWIRE protocols. Key electrical specifications include a sampling rate of 133ksps, a signal-to-noise ratio of 70dB, and integral nonlinearity of ±0.5 LSB. It is housed in a 16-pin QSOP package and functions within a temperature range of 0°C to +70°C.

Analog To Digital Converters (ADC) Feature Summary

• Integrates a 4-channel multiplexer with a high-bandwidth track/hold for efficient data acquisition.
• Features a flexible 4-wire serial interface that connects directly to microprocessors without external logic.
• Includes an internal 2.5V reference with a buffer amplifier offering voltage adjustment capabilities.
• Supports multiple power-down modes to minimize current consumption during idle periods.

Analog To Digital Converters (ADC) Applications

• Portable Data Logging
• Medical Instruments
• Pen Digitizers
• Battery-Powered Instruments

Analog To Digital Converters (ADC) Procurement Notes

Verify the component authenticity by checking the manufacturer markings against official datasheet specifications. Confirm the specific suffix 'ACEE+' corresponds to the commercial temperature range and lead-free packaging requirements. Ensure the ordering information matches the exact pin configuration and package dimensions required for the target PCB layout.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a low-power, 12-bit resolution ADC is required for battery-operated systems. The internal reference simplifies design compared to the MAX1247 variant, which requires an external reference. Ensure the system clock frequency supports the desired sampling rate and that the serial interface timing aligns with the host microcontroller's SPI or Microwire settings.

Analog To Digital Converters (ADC) Part Context

This part belongs to the MAX1246/MAX1247 family of low-power, serial 12-bit ADCs. It shares architectural similarities with the MAX186 and MAX146 series but offers a compact 16-pin QSOP footprint comparable to an 8-pin SO package. The device is designed to replace older parallel ADCs in space-constrained applications requiring moderate speed and precision.

Analog To Digital Converters (ADC) Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should verify compatibility with existing board layouts if considering alternative packages or pinouts from other manufacturers.

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. The return side must remain stable within ±0.5LSB relative to AGND during conversion.

What is the function of the SHDN pin?

The SHDN pin controls the shutdown state. Pulling it low shuts down the device, while pulling it high enables the internal reference-buffer amplifier. Floating the pin places the buffer in external compensation mode.

Can the MAX1246 operate with an external clock?

Yes, the device can use either an internal clock or an external serial-interface clock. In external clock mode, the SCLK frequency determines the conversion speed, up to 2MHz.