LTC2636CDE-HMX8#TRPBF

Overview

The LTC2636CDE-HMX8#TRPBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features eight independent channels with a rail-to-rail output buffer and an integrated 4.096V full-scale reference characterized by a low drift of 10ppm/°C. The device operates on a single 4.5V to 5.5V supply and communicates via a 3-wire SPI/MICROWIRE-compatible serial interface supporting clock rates up to 50MHz. It incorporates a power-on reset circuit configured to set outputs to mid-scale in external reference mode upon initialization.

Feature Summary

• Octal architecture providing eight independent 8-bit DAC channels in a compact package
• Integrated high-accuracy internal reference delivering a 4.096V full-scale output with 10ppm/°C temperature coefficient
• Rail-to-rail output buffers ensuring maximum dynamic range without external amplification
• Power-on reset logic defaults outputs to mid-scale when operating in external reference mode

Applications

• Process control and industrial automation systems requiring multi-channel signal generation
• Portable equipment utilizing single-supply operation
• Automotive electronic modules
• Optical networking infrastructure

Procurement Notes

Verify the specific ordering suffix HMX8 against the manufacturer's current documentation to confirm the power-on reset behavior and resolution. Ensure the supply voltage remains within the 4.5V to 5.5V range required for the H-grade internal reference configuration. Confirm the DFN-14 package compatibility with the target PCB footprint.

Selection Notes

Select this component when eight synchronized analog outputs are required from a single IC. The H-series designation mandates a minimum 4.5V supply, distinguishing it from the L-series which supports 2.7V. The MX suffix indicates mid-scale reset in external reference mode; choose Z or MI suffixes if zero-scale or internal-reference mid-scale resets are preferred. Verify that the 8-bit resolution meets the system accuracy requirements.

Part Context

This part belongs to the LTC2636 family of octal DACs available in 12-, 10-, and 8-bit resolutions. The CDE package code identifies the commercial temperature grade (0°C to 70°C) housed in a 14-lead plastic DFN. The H series specifically targets applications requiring a 4.096V full-scale range, whereas the L series provides 2.5V. The MSOP variant offers additional hardware control pins not present in the DFN package.

Replacement Considerations

Direct substitutes include other LTC2636 variants with different resolutions or reset configurations, such as LTC2636CDE-HZ8#TRPBF for zero-scale reset. Cross-family replacements like the LTC2637 offer I2C interfaces instead of SPI.