MAX1221BETX+

ADCs/DACs - Special Purpose Overview

The MAX1221BETX+ is a mixed-signal integrated circuit featuring an 8-channel, 12-bit analog-to-digital converter (ADC) and an octal, 12-bit digital-to-analog converter (DAC). It operates on a single supply voltage ranging from +2.7V to +5.25V with a maximum ADC throughput of 225ksps. The device incorporates a 2.5V internal reference, a temperature sensor accurate to ±1°C, and four configurable general-purpose I/O ports. Data transfer utilizes a 25MHz SPI/QSPI/MICROWIRE-compatible serial interface, supported by an on-chip FIFO for efficient data handling.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 12-bit, 225ksps ADC with true-differential track/hold and 8 single-ended channels
• Octal 12-bit DAC with 2µs settling time, ultra-low glitch energy (4nV·s), and low digital feedthrough
• On-chip 16-word FIFO, channel-scan mode, and internal data-averaging capabilities
• Internal 2.5V reference and ±1°C accurate temperature sensor with programmable GPIOs

ADCs/DACs - Special Purpose Applications

• Closed-loop controls for optical components and base stations
• System supervision and control
• Data-acquisition systems

ADCs/DACs - Special Purpose Procurement Notes

Verify the component against official Analog Devices or Maxim Integrated datasheets to confirm pinout compatibility and electrical specifications. Ensure that the operating conditions, including supply voltage ranges and thermal limits, align with the system requirements before integration.

ADCs/DACs - Special Purpose Selection Notes

Select this component when multichannel acquisition and simultaneous multi-output generation are required in a compact form factor. The MAX1221BETX+ is suitable for applications demanding low power consumption, high accuracy with ±0.5 LSB INL/DNL, and flexible reference configurations using either internal or external sources.

ADCs/DACs - Special Purpose Part Context

This part belongs to the MAX1221/MAX1223/MAX1343 family of 12-bit multichannel ADCs/DACs. While sharing core architecture, the MAX1221BETX+ specifically provides eight ADC channels and eight DAC outputs, distinguishing it from variants with different channel counts or missing DAC sections within the same series.

ADCs/DACs - Special Purpose Replacement Considerations

Direct replacements within the same package and functionality include the MAX1223BETX+ and MAX1343BETX+. Verify channel counts and GPIO availability, as these variants offer different combinations of ADC inputs and DAC outputs compared to the MAX1221BETX+.

ADCs/DACs - Special Purpose FAQ

What is the maximum sampling rate of the ADC?

The ADC supports a maximum conversion rate of 225ksps.

Does the device include an internal voltage reference?

Yes, it integrates a 2.5V internal reference that can be used for both the ADC and DAC, or an external reference can be selected.

How many general-purpose I/O ports are available?

The MAX1221BETX+ offers four configurable GPIO ports that can be set as inputs or outputs.