LTC2636CMS-LMX8#PBF

Overview

The LTC2636CMS-LMX8#PBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a selectable internal or external reference, with the 'LMX' suffix indicating mid-scale reset in external reference mode upon power-up. The device operates on a single 2.7V to 5.5V supply and communicates via a 50MHz SPI/MICROWIRE-compatible 3-wire serial interface. It includes double-buffered data latches and hardware clear (CLR) and asynchronous DAC update (LDAC) pins available in the MSOP package. The unit is housed in a 16-lead MSOP package.

Feature Summary

• Octal 8-Bit Resolution: Provides eight independent 8-bit DAC channels with guaranteed monotonicity over the operating temperature range.
• Power-On Reset Configuration: Resets outputs to mid-scale when powered up in external reference mode.
• High-Speed Interface: Supports SPI/MICROWIRE communication with clock rates up to 50MHz.
• Low Power Consumption: Draws approximately 0.9mA at 3V supply voltage.

Applications

• Mobile Communications
• Process Control and Industrial Automation
• Automatic Test Equipment

Procurement Notes

Verify the specific ordering suffix LMX8 corresponds to the required power-on reset behavior (mid-scale in external reference mode). Confirm the package type is 16-lead MSOP and the temperature grade is Commercial (C). Ensure the design supports either internal or external reference configurations as specified by the part variant.

Selection Notes

Select this component for applications requiring multiple low-resolution voltage outputs with fast update rates. The LMX suffix is critical if the system requires mid-scale initialization during power-up while using an external reference. For zero-scale initialization, choose the LZ suffix instead. Verify that the supply voltage range of 2.7V to 5.5V matches the system power rails.

Part Context

This part belongs to the LTC2636 family of octal DACs, which also offers 10-bit and 12-bit resolutions. Variants are distinguished by resolution (8/10/12), full-scale voltage options (L for 2.5V, H for 4.096V), and power-on reset behaviors (Z for zero-scale, MI for mid-scale internal, MX for mid-scale external). The CMS designation indicates the 16-lead MSOP package and commercial temperature grade.

Replacement Considerations

Direct replacements within the same family include LTC2636CMS-LMI8#PBF (mid-scale reset in internal reference mode) or LTC2636CMS-LZ8#PBF (zero-scale reset). Higher resolution options like LTC2636CMS-LMX10#PBF or LTC2636CMS-LMX12#PBF are pin-compatible but offer different linearity specifications.