LTC2636IMS-LZ8#TRPBF

Overview

The LTC2636IMS-LZ8#TRPBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a rail-to-rail output buffer and an integrated 10ppm/°C reference with a full-scale output of 2.5V. 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, power-on reset to zero-scale, and ultralow crosstalk between channels. Packaged in a 16-lead MSOP, it supports industrial temperature ranges.

Feature Summary

• Octal 8-Bit Resolution: Provides eight independent DAC channels with guaranteed monotonicity over the operating temperature range.
• Integrated Precision Reference: Features a 10ppm/°C internal reference yielding a 2.5V full-scale output; selectable for external reference operation.
• SPI Interface: Compatible with standard SPI and MICROWIRE protocols, supporting clock rates up to 50MHz with double-buffered data latches.
• Power-On Reset: Configured to reset outputs to zero-scale upon power-up, minimizing initial glitch amplitude.

Applications

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

Procurement Notes

Verify the specific ordering suffix #TRPBF indicates a tape and reel quantity of 2500 pieces. Confirm the IMS designation corresponds to the industrial temperature grade (-40°C to 85°C) and the MS package type. Ensure compatibility with the required 2.7V to 5.5V supply voltage range for the specified performance characteristics.

Selection Notes

Select this part for applications requiring multiple low-cost, low-power DAC channels with high accuracy. The 8-bit resolution offers a balance between cost and precision. Consider the MSOP package if exposed pad soldering is feasible for thermal management. Verify that the zero-scale power-on reset behavior aligns with system initialization requirements.

Part Context

This component belongs to the LTC2636 family, which includes variants with 10-bit and 12-bit resolutions, different full-scale voltages (2.5V or 4.096V), and alternative reset configurations (mid-scale). The 'L' suffix denotes the 2.5V internal reference version, while 'I' indicates the industrial temperature grade. The 'MS' package is a 16-lead plastic MSOP.

Replacement Considerations

Direct replacements within the same family include LTC2636IMS-LMI8#TRPBF (mid-scale reset) or LTC2636IMS-LZ10#TRPBF (10-bit resolution). Cross-family replacements require matching channel count, resolution, interface type, and package dimensions. Verify pinout compatibility and electrical specifications such as settling time and linearity before substitution.

FAQ

What is the maximum serial clock frequency?

The LTC2636 supports a serial clock (SCK) frequency of up to 50MHz.

How does the power-on reset function work?

The LTC2636IMS-LZ8 resets all DAC outputs to zero-scale when power is first applied, ensuring a known initial state.

Can the internal reference be bypassed?

Yes, the device can operate in external reference mode by applying a voltage to the REF pin, allowing the full-scale output to be set by the external reference voltage.