LTC2636IDE-LMX8#PBF

Overview

The LTC2636IDE-LMX8#PBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a 10ppm/°C internal reference and operates on a single 2.7V to 5.5V supply. The device provides rail-to-rail output buffers and guarantees monotonicity over the industrial temperature range of –40°C to 85°C. Communication occurs via a 3-wire SPI/MICROWIRE-compatible interface with clock rates up to 50MHz. Power-on reset defaults to mid-scale in external reference mode. It is housed in a 16-lead MSOP package.

Feature Summary

• Octal 8-Bit Resolution: Eight independent DAC channels with guaranteed monotonicity and ±0.5 LSB DNL.
• Integrated Reference: Built-in 10ppm/°C reference providing a 2.5V full-scale output; supports external reference selection.
• High-Speed Interface: 3-wire serial interface compatible with SPI and MICROWIRE, supporting SCK frequencies up to 50MHz.
• Power Management: Includes power-on reset to mid-scale, double-buffered data latches, and low power-down current.

Applications

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

Procurement Notes

Verify the specific ordering suffix #PBF indicates lead-free construction and tube packaging for the MSOP variant. Confirm the IDE designation corresponds to the Industrial temperature grade (-40°C to +85°C). Ensure the LMX8 suffix matches the required mid-scale reset behavior in external reference mode. Cross-reference the manufacturer's latest datasheet revision for any pinout or electrical characteristic updates.

Selection Notes

Select this part when eight independent analog outputs are required in a compact form factor. The LMX8 variant is appropriate if system initialization requires outputs to settle at mid-scale rather than zero-scale upon power-up. Verify that the 2.5V internal reference span meets the application voltage requirements, or utilize the REF pin for external reference scaling. The MSOP package offers dedicated LDAC and CLR pins not available in the DFN version.

Part Context

This component belongs to the LTC2636 family of octal DACs, which also includes 10-bit and 12-bit variants (LTC2636IDE-LMX10, LTC2636IDE-LMX12). The family shares identical pinouts and interface protocols but differs in resolution, linearity specifications, and settling times. The 'I' grade denotes industrial temperature performance, distinct from the commercial 'C' grade and automotive 'H' grade options.

Replacement Considerations

Direct substitutes within the same package and pinout include other LTC2636 variants such as LTC2636IDE-LMX10#PBF or LTC2636IDE-LMX12#PBF for higher resolution needs. For different reset behaviors, consider LTC2636IDE-LZ8#PBF for zero-scale reset. External reference versions like LTC2636IDE-LMX8#TRPBF offer the same functionality in tape-and-reel packaging.

FAQ

What is the default output state after power-up for the LTC2636IDE-LMX8?

The LTC2636IDE-LMX8 is configured to reset to mid-scale in external reference mode upon power-up. In internal reference mode, it resets to a mid-scale voltage of 1.25V.

Does the LTC2636IDE-LMX8 support simultaneous updating of all DAC channels?

Yes, the device features double-buffered data latches and an asynchronous DAC update pin (LDAC) in the MSOP package, allowing simultaneous updates of all channels.

What is the maximum serial clock frequency for the LTC2636IDE-LMX8?

The serial interface supports clock rates up to 50MHz while maintaining compatibility with standard SPI and MICROWIRE protocols.