LTC2637CDE-LMI10#PBF

Overview

The LTC2637CDE-LMI10#PBF is an octal 10-bit voltage-output digital-to-analog converter (DAC) from Analog Devices Inc. It features an integrated precision reference with a temperature coefficient of 10ppm/°C, providing a full-scale output of 2.5V. The device operates on a single supply voltage ranging from 2.7V to 5.5V and communicates via a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. It includes double-buffered data latches and a power-on reset circuit configured to reset outputs to mid-scale in internal reference mode. The component is housed in a 14-lead DFN package and is rated for commercial operation between 0°C and 70°C.

Feature Summary

• Octal architecture with 10-bit resolution per channel
• Integrated 10ppm/°C precision reference yielding 2.5V full-scale output
• Rail-to-rail output buffers guaranteed monotonic over the operating range
• Ultralow DAC-to-DAC crosstalk specified at less than 3nV•s

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable battery-powered equipment
• Automotive electronics
• Optical networking infrastructure

Procurement Notes

Verify that the C-grade suffix corresponds to the commercial temperature range of 0°C to 70°C rather than the wider industrial or automotive ranges. Confirm the LMI10 suffix indicates the specific 10-bit resolution and mid-scale power-on reset behavior. Ensure the DE package designation matches the required 14-lead DFN footprint for the PCB layout.

Selection Notes

Select this part when eight independent low-power voltage outputs are required within a compact surface-mount footprint. The 2.7V to 5.5V supply range allows compatibility with various logic levels. Consider the external reference option if a higher full-scale voltage or different reference source is needed, as the internal reference limits the output span to 2.5V.

Part Context

This component belongs to the LTC2637 family, which also offers 8-bit and 12-bit resolutions. Variants exist with H-grade references providing 4.096V full-scale output and different power-on reset configurations such as zero-scale or external reference mid-scale. The MSOP package variant provides sixteen leads compared to the fourteen leads of the DFN package used by this specific model.

Replacement Considerations

LTC2637CDE-LZ10#PBF: Identical electrical specifications but resets to zero-scale upon power-up instead of mid-scale.

FAQ

What is the settling time for the LTC2637CDE-LMI10#PBF?

The typical settling time to ±1LSB (±0.098%) is 4.1µs when operating at VCC = 3V.

How does the device handle multiple units on the same bus?

The CA0, CA1, and CA2 pins allow for hardware address selection by tying them to VCC, GND, or leaving them floating, enabling up to eight devices on a single I2C bus.

Is the output buffer capable of driving capacitive loads?

Yes, the rail-to-rail output buffers are specified to drive capacitive loads up to 500pF without instability.