MAX5121AEEE+

Overview

The MAX5121AEEE+ is a low-power, 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices/Maxim Integrated. Operating on a single +3V supply, it features an internal precision bandgap reference of +1.25V and delivers a full-scale output range of +2.0475V. The device includes a buffered output amplifier capable of driving 5kΩ loads or 4–20mA circuits. It draws 500µA during operation, reducing to 3µA in power-down mode. Key specifications include a 20µs settling time, ±1 LSB DNL, and ±2 LSB INL for the 'B' grade variant. The component utilizes a 3-wire serial interface compatible with SPI, QSPI, and MICROWIRE standards.

Feature Summary

• Single-supply operation at +3V with internal +1.25V reference
• 12-bit resolution with 20µs settling time and ±1 LSB DNL
• 3-wire serial interface compatible with SPI, QSPI, and MICROWIRE
• Power-down mode reduces current consumption to 3µA

Applications

• Industrial Process Controls
• Automatic Test Equipment (ATE)
• Digital Offset and Gain Adjustment
• Motion Control Systems
• Microprocessor-Controlled Systems

Procurement Notes

Verify the specific accuracy grade suffix when ordering. The 'A' suffix denotes ±1 LSB Integral Nonlinearity (INL), while the 'B' suffix indicates ±2 LSB INL. Confirm package availability as the QSOP-16 form factor may have limited stock depending on the distributor. Ensure the design accounts for the extended industrial temperature range of -40°C to +85°C.

Selection Notes

Select the MAX5121AEEE+ for applications requiring a +3V supply rail and a maximum output swing of approximately +2V. Choose the 'A' grade if tighter linearity accuracy (±1 LSB INL) is required compared to the 'B' grade. Consider the MAX5120 if a +5V supply and higher output voltage (+4.095V) are necessary, as both devices share pin compatibility and functional architecture.

Part Context

This component belongs to the MAX5120/MAX5121 family of serial DACs. It serves as the 3V counterpart to the MAX5120, which operates at 5V. The series offers pin-compatible upgrades to 13-bit (MAX5130/MAX5131) and 14-bit (MAX5170/MAX5172) resolutions, allowing for performance scaling without PCB redesign.

Replacement Considerations

Pin-compatible alternatives include the MAX5120 (5V version), MAX5130/MAX5131 (13-bit versions), and MAX5170/MAX5172 (14-bit versions). Verify that the replacement part's supply voltage and output range meet the system requirements.