LTC2637HMS-LMX8#PBF

Overview

The LTC2637HMS-LMX8#PBF 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 includes rail-to-rail output buffers guaranteed monotonic over the –40°C to 125°C automotive temperature range. Communication is handled via a 2-wire I²C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Power-on reset options include mid-scale initialization in external reference mode.

Feature Summary

• Octal architecture with eight independent 8-bit DAC channels
• Integrated precision reference yielding 4.096V full-scale output
• Ultralow crosstalk between DACs (<3nV•s)
• Power-on reset configured for mid-scale in external reference mode

Applications

• Process control and industrial automation
• Automatic test equipment
• Portable equipment
• Automotive systems

Procurement Notes

Verify the specific suffix LMX8 corresponds to the required power-on reset behavior (mid-scale in external reference mode) and 8-bit resolution. Confirm the MSOP package type matches the PCB footprint requirements. Ensure the system design supports the 4.5V to 5.5V supply voltage range mandated by the H-grade internal reference.

Selection Notes

Select this part when multiple low-channel-count DACs are needed in a compact form factor. The H-grade variant requires a minimum 4.5V supply, unlike the L-grade which supports 2.7V. The LMX suffix dictates the startup state; choose LZ for zero-scale or LMI for mid-scale with internal reference if those behaviors better suit the application's power-up sequence.

Part Context

This component belongs to the LTC2637 family, which offers 8-, 10-, and 12-bit resolutions in both DFN and MSOP packages. The H-grade designation specifically indicates the 4.096V full-scale capability and extended –40°C to 125°C operating temperature range suitable for automotive environments.

Replacement Considerations

Direct substitutes within the same family include LTC2637HMS-LZ8#PBF (zero-scale reset) and LTC2637HMS-LMI8#PBF (mid-scale reset with internal reference). For different resolutions, consider LTC2637HMS-LMX10#PBF or LTC2637HMS-LMX12#PBF.