LTC2636IDE-HMX8#PBF

Overview

The LTC2636IDE-HMX8#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 3-wire SPI/MICROWIRE-compatible interface supporting clock rates up to 50MHz. Power-on reset defaults to mid-scale in external reference mode.

Feature Summary

• Octal 8-Bit Architecture: Eight independent DAC channels with rail-to-rail output buffers.
• High-Accuracy Internal Reference: Integrated 10ppm/°C reference yielding a 4.096V full-scale output.
• Automotive Grade Reliability: Guaranteed monotonic operation across the –40°C to 125°C temperature range.
• Flexible Reset Configuration: Power-on reset sets outputs to mid-scale when using external reference modes.

Applications

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

Procurement Notes

Verify the specific ordering suffix #PBF indicates lead-free packaging and tube distribution. Confirm that the H-grade designation matches the required automotive temperature range of –40°C to 125°C. Ensure the power supply sequencing adheres to the absolute maximum ratings for the REF pin during turn-on to prevent damage.

Selection Notes

Select this part for applications requiring eight synchronized analog outputs with precise scaling. The H-series variant is necessary for 4.096V full-scale ranges, unlike the L-series which provides 2.5V. Verify compatibility with the system's SPI clock speed and ensure the 4.5V minimum supply voltage aligns with the available power rails.

Part Context

This component belongs to the LTC2636 family of octal DACs, which also offers 10-bit and 12-bit resolutions. Variants within the family differ by full-scale voltage (2.5V or 4.096V), reset behavior (zero-scale or mid-scale), and package type (DFN or MSOP). The IDE suffix denotes the industrial temperature grade, while the H suffix specifies the higher voltage internal reference configuration.

Replacement Considerations

Direct substitutes include other LTC2636 variants such as LTC2636IDE-LMX8#PBF for lower voltage requirements or LTC2636HMX8#PBF if the package type differs. Cross-family replacements like the LTC2637 offer I2C interfaces instead of SPI. Verify pinout compatibility and thermal resistance differences between DFN and MSOP packages before substitution.

FAQ

What is the default output state upon power-up for the LTC2636IDE-HMX8?

In external reference mode, the power-on reset circuitry sets all DAC outputs to mid-scale. In internal reference mode, the same variant would also reset to mid-scale.

How does the internal reference affect the full-scale output voltage?

When operating in internal reference mode, the integrated 10ppm/°C reference sets the full-scale output to 4.096V for the H-series devices.

Is the LTC2636IDE-HMX8 guaranteed to be monotonic?

Yes, the device is guaranteed monotonic over the entire specified operating temperature range of –40°C to 125°C.