LTC2637HDE-HMX12#PBF

Overview

The LTC2637HDE-HMX12#PBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices Inc. It features a high-accuracy internal reference with a 10ppm/°C temperature coefficient, providing a full-scale output of 4.096V. The device operates on a single 4.5V to 5.5V supply and utilizes a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±2.5 LSB, a typical settling time of 5µs at ±1LSB, and ultralow DAC-to-DAC crosstalk of less than 3nV•s. The part is housed in a 14-lead DFN package.

Feature Summary

• Octal 12-bit resolution with rail-to-rail buffered outputs
• Integrated 4.096V precision reference with 10ppm/°C drift
• Guaranteed monotonic operation over –40°C to 125°C temperature range
• Power-on reset configured to mid-scale in external reference mode

Applications

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

Procurement Notes

Verify the specific ordering suffix HMX12#PBF against the manufacturer's current documentation to confirm power-on reset behavior and tape-and-reel packaging details. Ensure the design supports the required 4.5V to 5.5V supply voltage for the H-grade variant. Confirm that the 14-lead DFN footprint matches the PCB layout requirements, including the exposed ground pad connection.

Selection Notes

Select this component when eight independent 12-bit voltage outputs are required within a compact footprint. The H-grade designation indicates suitability for automotive applications requiring operation up to 125°C. Choose the MX suffix if the system requires the DAC outputs to initialize to mid-scale during power-up when using an external reference voltage. Ensure the I2C bus speed does not exceed 400kHz.

Part Context

This part belongs to the LTC2637 family, which includes 8-bit, 10-bit, and 12-bit variants. The 'H' suffix denotes the automotive temperature grade (-40°C to 125°C) and the 4.096V internal reference option. The 'DE' indicates the 14-lead DFN package, while 'MX' specifies the mid-scale reset configuration for external reference modes. Other options include the L-grade for lower voltage supplies and Z-suffix for zero-scale reset.

Replacement Considerations

Direct pin-compatible substitutes within the same package include other LTC2637 variants such as LTC2637HDE-HMI12#PBF or LTC2637HDE-HZ12#PBF, differing primarily in power-on reset behavior. For different resolutions, the LTC2637HDE-HMX10#PBF or LTC2637HDE-HMX8#PBF offer 10-bit and 8-bit options respectively.