LTC2636CMS-HMI8#PBF

Overview

The LTC2636CMS-HMI8#PBF is an octal, 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a 10ppm/°C internal reference with a full-scale output of 4.096V and operates on a single 4.5V to 5.5V supply. The device utilizes a 3-wire SPI/MICROWIRE-compatible interface with clock rates up to 50MHz. It includes double-buffered data latches, ultralow crosstalk between DACs (<2.4nV•s), and guaranteed monotonicity over the operating temperature range. The part is housed in a 16-lead MSOP package.

Feature Summary

• Octal 8-Bit Resolution: Provides eight independent 8-bit DAC channels with rail-to-rail output buffers.
• High-Accuracy Reference: Integrated 10ppm/°C reference sets a 4.096V full-scale output.
• Power-On Reset: Configured for Mid-Scale reset in external reference mode upon power-up.
• Low Power Consumption: Draws approximately 1.0mA at 5V with internal reference.

Applications

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

Procurement Notes

Verify the specific ordering suffix HMI8 corresponds to the 16-lead MSOP package, 4.096V full-scale, and mid-scale power-on reset behavior. Confirm the C-grade temperature rating (0°C to 70°C) meets system requirements. Ensure the datasheet revision matches the design specifications for timing and electrical characteristics.

Selection Notes

Select this component when eight independent 8-bit outputs are required with a fixed 4.096V span. The HMI suffix indicates mid-scale reset in external reference mode; choose HZ if zero-scale reset is needed. Verify that the 4.5V minimum supply voltage aligns with the system power rails, as the L-grade variant supports lower voltages.

Part Context

This part belongs to the LTC2636 family of octal DACs available in 12-, 10-, and 8-bit resolutions. Variants differ by resolution, full-scale voltage (2.5V or 4.096V), power-on reset behavior, and temperature grade. The CMS designation specifically identifies the commercial temperature grade and MSOP packaging.

Replacement Considerations

Direct substitutes within the same family include LTC2636IMS-HMI8#PBF for industrial temperature range (-40°C to 85°C) or LTC2636HMS-HMI8#PBF for automotive range (-40°C to 125°C). Other resolutions like LTC2636IMS-HMI10#PBF share the pinout but offer higher precision.

FAQ

What is the power-on reset state for the LTC2636CMS-HMI8?

In internal reference mode, the outputs reset to mid-scale (2.048V). In external reference mode, they also reset to mid-scale of the external reference voltage.

What is the maximum serial clock frequency?

The device supports a serial clock (SCK) frequency up to 50MHz with a 50% duty cycle.

How does the REF pin function?

In internal reference mode, the REF pin provides access to the 2.048V internal reference output. In external reference mode, it serves as the input for setting the full-scale output voltage.