LTC2637IDE-LMX12#PBF

Overview

The LTC2637IDE-LMX12#PBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a selectable internal or external reference, with the 'L' suffix indicating a 2.5V full-scale output and operation from a single 2.7V to 5.5V supply. The device includes double-buffered data latches and operates via a 2-wire I²C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key electrical specifications include a maximum integral nonlinearity (INL) of ±2.5 LSB, a settling time of 4.5µs at 3V, and ultralow DAC-to-DAC crosstalk below 3nV•s.

Feature Summary

• Octal architecture with 12-bit resolution and rail-to-rail buffered outputs
• Selectable internal (2.5V) or external reference input
• I²C interface with double-buffered data latches for glitch-free updates
• Guaranteed monotonic operation over –40°C to 85°C temperature range

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 suffixes against the manufacturer's documentation to confirm package type, temperature grade, and power-on reset behavior. Ensure the selected variant matches the required supply voltage range and reference configuration for the target application design.

Selection Notes

Select this component when multiple low-power, high-precision voltage outputs are required in a compact form factor. The 'LMX' designation indicates mid-scale power-on reset with external reference capability. Consider the 14-lead DFN or 16-lead MSOP packages based on PCB space constraints and thermal management requirements.

Part Context

This part belongs to the LTC2637 family of octal DACs, which also includes 10-bit and 8-bit variants. The family shares common architectural features such as the I²C interface and low-drift reference options, allowing for scalable designs across different resolution needs within the same product line.

Replacement Considerations

Direct substitutes within the same family include other LTC2637 variants with different resolutions (e.g., LTC2637IDE-LMX10#PBF for 10-bit) or reset configurations (e.g., LTC2637IDE-LZ12#PBF for zero-scale reset). Cross-family replacements require verification of pin compatibility and electrical parameter alignment.

FAQ

What is the full-scale output voltage when using the internal reference?

For the LTC2637-L series, the full-scale output voltage with the internal reference is 2.5V.

How does the device handle power-up states?

The LTC2637 incorporates a power-on reset circuit that can be configured to reset to zero-scale or mid-scale, depending on the specific ordering suffix.

What is the maximum operating speed of the I²C interface?

The device supports both standard mode (100kHz) and fast mode (400kHz) clock rates for the I²C serial interface.