LTC2637CDE-LMX12#PBF

Overview

The LTC2637CDE-LMX12#PBF is an octal 12-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 and operates on a single 2.7V to 5.5V supply. The device provides rail-to-rail buffered outputs and guarantees monotonicity across the commercial temperature range of 0°C to 70°C. Communication is handled via a 2-wire I²C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. This specific part number includes double-buffered data latches and is configured for power-on reset to mid-scale in external reference mode.

Feature Summary

• Octal architecture with 12-bit resolution and ±2.5 LSB maximum integral nonlinearity error
• Integrated 10ppm/°C precision reference enabling 2.5V full-scale output
• I²C-compatible serial interface with selectable slave addresses via CA0, CA1, and CA2 pins
• Power-on reset circuit configurable to mid-scale for external reference operation

Applications

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

Procurement Notes

Verify that the C suffix corresponds to the commercial temperature grade (0°C to 70°C) rather than industrial or automotive grades. Confirm the DE package designation matches the required 14-lead DFN footprint. Ensure the LMX12 suffix correctly specifies the 12-bit resolution and the mid-scale reset behavior for external reference configurations before finalizing procurement.

Selection Notes

Select this component when eight independent 12-bit channels are required within a compact surface-mount footprint. The internal reference simplifies design by eliminating external components, though an external reference can be used if different full-scale voltages are needed. Verify that the I²C bus speed requirements align with the device's support for standard and fast modes up to 400kHz.

Part Context

This part belongs to the LTC2637 family, which offers 8-, 10-, and 12-bit resolutions in both DFN and MSOP packages. Variants differ by temperature grade (C, I, H), full-scale voltage (L for 2.5V, H for 4.096V), and power-on reset behavior (Z for zero-scale, MI/MX for mid-scale). The CDE-LMX12 variant specifically targets commercial applications requiring mid-scale initialization.

Replacement Considerations

Direct substitutes include other LTC2637 variants with matching pinouts but potentially different resolutions or reset behaviors, such as LTC2637CDE-LZ12#PBF or LTC2637CDE-MI12#PBF. Cross-family replacements like the LTC2635 (quad channel) require schematic redesign due to channel count differences.