LTC2637HMS-LMX8#TRPBF

Overview

The LTC2637HMS-LMX8#TRPBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a high-accuracy internal reference with a temperature coefficient of 10ppm/°C, providing a full-scale output of 4.096V. The device operates on a single 4.5V to 5.5V supply and utilizes a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key electrical characteristics include rail-to-rail buffered outputs, guaranteed monotonicity over the –40°C to 125°C automotive temperature range, and ultralow DAC-to-DAC crosstalk (<3nV•s). The part incorporates double-buffered data latches and a power-on reset circuit configured to reset to mid-scale in external reference mode.

Feature Summary

• Octal 8-Bit Resolution: Provides eight independent 8-bit DAC channels with ±0.5 LSB INL/DNL accuracy.
• High-Accuracy Internal Reference: Integrated 10ppm/°C reference yields a 4.096V full-scale output.
• Automotive Temperature Grade: Guaranteed monotonic operation across –40°C to 125°C.
• Power-On Reset Configuration: LMX suffix ensures reset to mid-scale when using an external reference.

Applications

• Process Control and Industrial Automation
• Automatic Test Equipment
• Portable Equipment
• Automotive Systems

Procurement Notes

Verify the specific ordering suffix 'LMX' confirms the mid-scale reset behavior for external reference applications. Confirm the 'H' grade designation matches the required 4.5V to 5.5V supply range and –40°C to 125°C operating temperature. Ensure the MSOP package and tape-and-reel packaging align with assembly requirements.

Selection Notes

Select this component for designs requiring multiple low-cost, low-power DAC channels with precise internal referencing. The H-grade variant is necessary for automotive or wide-temperature industrial environments. The LMX reset option is suitable for systems where a known mid-scale state is preferred upon startup when driving an external reference voltage.

Part Context

This part belongs to the LTC2637 family of octal DACs, which also includes 10-bit and 12-bit resolutions. Variants are available with different full-scale voltages (2.5V or 4.096V), temperature grades (Commercial, Industrial, Automotive), and reset configurations (Zero-Scale or Mid-Scale). The MSOP package offers a compact footprint for space-constrained PCB layouts.

Replacement Considerations

Direct substitutes within the same family include LTC2637HMS-LMI8#TRPBF (mid-scale reset for internal reference) and LTC2637HMS-HZ8#TRPBF (zero-scale reset). For different resolutions, consider LTC2637HMS-LMX10#TRPBF (10-bit) or LTC2637HMS-LMX12#TRPBF (12-bit), noting that linearity specifications vary by resolution.