LTC2636CDE-LMX10#PBF

Overview

The LTC2636CDE-LMX10#PBF is an octal, 10-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a 14-lead DFN package and operates on a single 2.7V to 5.5V supply. The device includes an integrated high-accuracy reference with a temperature coefficient of 10ppm/°C. It utilizes a 3-wire SPI/MICROWIRE-compatible serial interface with clock rates up to 50MHz. Key specifications include a settling time of 4µs at ±1LSB for 10-bit resolution, rail-to-rail output buffering, and guaranteed monotonicity over the commercial temperature range of 0°C to 70°C.

Feature Summary

• Octal architecture with eight independent 10-bit DAC channels in a compact 14-lead DFN package.
• Integrated 10ppm/°C reference providing a full-scale output of 2.5V in internal reference mode.
• Power-on reset configured to mid-scale when operating in external reference mode (LMX suffix).
• Ultralow DAC-to-DAC crosstalk specification of less than 2.4nV•s.

Applications

• Mobile communications systems requiring multi-channel signal generation.
• Process control and industrial automation instrumentation.
• Automatic test equipment utilizing precise voltage references.
• Portable battery-powered equipment due to low power consumption.
• Automotive electronic modules and optical networking devices.

Procurement Notes

Verify the specific ordering suffix LMX10#PBF against official Analog Devices documentation to confirm the mid-scale reset behavior in external reference mode. Ensure the procurement channel provides genuine components with traceable manufacturing data. Confirm that the 14-lead DFN package type matches the design requirements for thermal dissipation and PCB layout constraints.

Selection Notes

Select this component when eight simultaneous analog outputs are required within a limited board area. The LMX variant is appropriate for designs where the system initializes to a safe mid-scale voltage during power-up while using an external reference source. Compare settling times and linearity specifications against other members of the LTC2636 family if higher resolution or different temperature grades are needed.

Part Context

This part belongs to the LTC2636 family of octal DACs, which also includes 8-bit and 12-bit variants. The DE suffix denotes the 14-lead plastic DFN package, distinguishing it from the 16-lead MSOP option. The C grade specifies the commercial temperature range, differing from the I and H grades designed for wider industrial and automotive environments.

Replacement Considerations

Direct substitutes within the same family include the LTC2636CDE-LMI10#PBF, which resets to mid-scale in internal reference mode, and the LTC2636CDE-LZ10#PBF, which resets to zero-scale. Verify pin compatibility and software command code adjustments if replacing with these variants.

FAQ

What is the full-scale output voltage when using the internal reference?

When operating in internal reference mode, the LTC2636-L series provides a full-scale output of 2.5V.

How does the LMX suffix affect the power-on state?

The LMX suffix configures the power-on reset circuit to set the DAC outputs to mid-scale when the device powers up in external reference mode.

What is the maximum serial clock frequency supported?

The device supports a serial clock (SCK) frequency of up to 50MHz for data input via the SPI/MICROWIRE interface.