LTC2637CDE-LMX8#TRPBF

Overview

The LTC2637CDE-LMX8#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 operates on a single 2.7V to 5.5V supply. The device integrates a precision reference with a temperature coefficient of 10ppm/°C, providing a full-scale output of 2.5V. Communication is handled 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 3.5µs, and a power-on reset function configured to initialize outputs to mid-scale in external reference mode.

Feature Summary

• Octal architecture with 8 independent 8-bit DAC channels
• Integrated 10ppm/°C precision reference for 2.5V full-scale output
• Rail-to-rail buffered outputs guaranteed monotonic over the operating range
• Ultralow crosstalk between DACs (<3nV•s)

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable battery-powered equipment

Procurement Notes

Verify that the C suffix corresponds to the commercial temperature grade (0°C to 70°C). Confirm the DE package designation matches the required 14-lead DFN form factor. Ensure the LMX8 suffix correctly specifies the 8-bit resolution and the mid-scale power-on reset behavior for external reference configurations.

Selection Notes

Select this component when multiple low-channel-count DACs are needed in a compact footprint. The internal reference simplifies design by eliminating external components, though an external reference can be used if a different full-scale voltage is required. Verify that the I2C bus speed requirements align with the device's support for standard and fast modes.

Part Context

This part belongs to the LTC2637 family, which includes 10-bit and 12-bit variants. The specific ordering suffixes determine the resolution (8, 10, or 12 bits), the power-on reset state (Zero-Scale, Mid-Scale), and the package type (DFN or MSOP). The 'C' indicates the commercial temperature grade, distinguishing it from the Industrial (I) and Automotive (H) grades.

Replacement Considerations

Direct substitutes within the same family include LTC2637CDE-LZ8#TRPBF (Zero-Scale reset) and LTC2637CDE-MI8#TRPBF (Mid-Scale reset with internal reference). For higher resolution needs, consider the 10-bit (LTC2637CDE-LM10#TRPBF) or 12-bit (LTC2637CDE-LM12#TRPBF) equivalents.