LTC2637HMS-HMX12#PBF

Overview

The LTC2637HMS-HMX12#PBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices Inc. It features a high-accuracy internal reference with a 10ppm/°C temperature coefficient, providing a full-scale output of 4.096V. The device operates on a single 4.5V to 5.5V supply and communicates via a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±2.5 LSB, a settling time of 5µs at ±1LSB, and ultralow DAC-to-DAC crosstalk of less than 3nV•s. The part is housed in a 16-lead MSOP package and is guaranteed monotonic over the automotive temperature range of –40°C to 125°C.

Feature Summary

• Octal 12-bit resolution with rail-to-rail buffered outputs
• Integrated 4.096V precision reference with 10ppm/°C drift
• I2C interface with selectable power-on reset to mid-scale for external reference mode
• Ultralow crosstalk (<3nV•s) and double-buffered data latches

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable equipment
• Automotive applications
• Optical networking

Procurement Notes

Verify the specific ordering suffix HMX12 corresponds to the 12-bit resolution, external reference power-on reset configuration, and H-grade automotive temperature rating. Confirm the MSOP-16 package type matches the design requirements. Ensure the I2C address pins (CA0, CA1, CA2) are correctly configured on the PCB to avoid bus conflicts, as these pins determine the slave address.

Selection Notes

Select this component when eight independent 12-bit voltage outputs are required in a compact footprint. The H-grade variant is necessary for environments requiring operation up to 125°C. The HMX suffix ensures the outputs initialize to mid-scale upon power-up when using an external reference, which may be preferred for specific system safety or initialization protocols compared to zero-scale options.

Part Context

This part belongs to the LTC2637 family of octal DACs, which also includes variants with 10-bit and 8-bit resolutions, different full-scale voltages (2.5V vs 4.096V), and alternative power-on reset behaviors. The H-series specifically denotes the automotive grade with extended temperature capabilities and higher supply voltage requirements compared to the L-series commercial parts.

Replacement Considerations

Direct pin-compatible substitutes within the same family include LTC2637HMS-HMI12#PBF (internal reference reset) and LTC2637HMS-HZ12#PBF (zero-scale reset). For lower resolution needs, LTC2637HMS-HMX10#PBF or LTC2637HMS-HMX8#PBF offer compatible interfaces and packages.