LTC2637HMS-LMI8#PBF

Overview

The LTC2637HMS-LMI8#PBF is an octal, 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices Inc. It features an integrated precision reference with a full-scale output of 4.096V and operates on a single 4.5V to 5.5V supply. The device communicates via a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. It includes rail-to-rail output buffers guaranteed monotonic over the –40°C to 125°C temperature range. Key electrical specifications include a maximum integral nonlinearity error of ±0.5 LSB, a settling time of 3.9µs, and low power consumption of 100µA per DAC at 3V.

Feature Summary

• Octal architecture with 8 independent 8-bit channels in a 16-lead MSOP package
• Integrated 4.096V precision reference with ±10ppm/°C drift
• Rail-to-rail output buffers with ultralow crosstalk (<3nV•s)
• I2C interface with selectable internal or external reference modes

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable battery-powered equipment
• Automotive electronics
• Optical networking devices

Procurement Notes

Verify the specific ordering suffix LMI8 corresponds to the 8-bit resolution, mid-scale reset in internal reference mode, and H-grade automotive temperature rating. Confirm the MS package type matches the design requirements for the 16-lead MSOP footprint. Ensure the #PBF designation indicates lead-free compliance as specified in the manufacturer's documentation.

Selection Notes

Select this component when eight independent analog outputs are required within a compact surface-mount footprint. The H-grade variant is suitable for environments requiring operation up to 125°C. The internal 4.096V reference simplifies board layout by eliminating the need for an external voltage reference source, provided the supply voltage remains between 4.5V and 5.5V.

Part Context

This part belongs to the LTC2637 family, which offers 12-, 10-, and 8-bit resolutions. The 'H' suffix denotes the automotive temperature grade (-40°C to 125°C), while 'LMI8' specifies the 4.096V full-scale range, mid-scale power-on reset behavior, and 8-bit resolution. Other variants include the LTC2637L series for lower voltage applications and different reset configurations such as zero-scale or external reference modes.

Replacement Considerations

Direct substitutes within the same family include the LTC2637HMS-LMX8#PBF (external reference mode) and LTC2637HMS-LZ8#PBF (zero-scale reset). For pin-compatible alternatives with different resolutions, consider the LTC2637HMS-LMI10#PBF or LTC2637HMS-LMI12#PBF, ensuring interface timing and software drivers are adjusted accordingly.