LTC2637CDE-HZ8#PBF

Overview

The LTC2637CDE-HZ8#PBF is an octal, 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a high-accuracy internal reference with a temperature coefficient of 10ppm/°C and a full-scale output of 4.096V. The device operates on a single 4.5V to 5.5V supply and communicates via 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 ±0.5 LSB, a settling time of 3.9µs at ±1 LSB, and ultralow DAC-to-DAC crosstalk below 3nV•s. The unit incorporates double-buffered data latches and a power-on reset circuit configured to initialize outputs to zero-scale.

Feature Summary

• Octal architecture providing eight independent 8-bit voltage outputs in a compact package
• Integrated precision reference yielding a 4.096V full-scale output with 10ppm/°C drift
• I2C-compatible serial interface with selectable slave addresses via CA0 pin
• Power-on reset function defaults all channels to zero-scale upon initialization

Applications

• Process control and industrial automation systems
• Portable battery-powered equipment
• Automotive electronic modules
• Optical networking infrastructure

Procurement Notes

Verify the specific ordering suffixes against official documentation to confirm package type, temperature grade, and power-on reset behavior. Confirm that the intended application supply voltage aligns with the 4.5V to 5.5V requirement for the H-grade variant. Ensure I2C bus pull-up resistors are correctly sized for the desired clock speed.

Selection Notes

Select this component when multiple low-cost, low-power voltage outputs are required within a constrained board area. The H-grade designation indicates suitability for applications requiring a 4.096V span, whereas the L-grade provides a 2.5V span with a wider supply range. Verify that the system logic levels are compatible with the specified I2C input voltage thresholds.

Part Context

This part belongs to the LTC2637 family, which includes 12-bit and 10-bit variants alongside the 8-bit version. The 'C' suffix denotes the commercial temperature range (0°C to 70°C), while 'H' specifies the internal reference voltage level. The 'DE' indicates the 14-lead DFN package, and 'Z' configures the power-on reset state to zero-scale.

Replacement Considerations

Direct functional substitutes within the same family include the LTC2637CDE-LZ8#PBF for a 2.5V full-scale output or the LTC2637IDE-HZ8#PBF for an extended industrial temperature range.