LTC2637CDE-LMI12#PBF

Overview

The LTC2637CDE-LMI12#PBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices Inc. It features a commercial temperature grade (0°C to 70°C) and operates on a single 2.7V to 5.5V supply. The device integrates a precision 2.5V full-scale reference with a 10ppm/°C drift coefficient. It 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) of ±2.5 LSB, a settling time of 4.5µs for 12-bit accuracy, and ultralow DAC-to-DAC crosstalk below 3nV•s. The unit utilizes a 14-lead 4mm × 3mm DFN package.

Feature Summary

• Octal 12-bit resolution with rail-to-rail output buffers guaranteed monotonic over the operating temperature range
• Integrated 2.5V full-scale reference with 10ppm/°C temperature coefficient
• Ultralow crosstalk between DAC channels (<3nV•s) and double-buffered data latches
• Power-on reset circuit configured to reset outputs to mid-scale in internal 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 LMI12 corresponds to the 12-bit resolution and mid-scale power-on reset configuration. Confirm the DE package designation matches the required 14-lead DFN form factor. Ensure the C-grade temperature rating aligns with the system's operational environment requirements before finalizing procurement.

Selection Notes

Select this component when eight independent 12-bit voltage outputs are required within a compact footprint. The internal 2.5V reference simplifies design by eliminating external reference components. Choose the LMI variant if a mid-scale initialization state is preferred upon power-up. Consider the H-grade or I-grade variants if operation outside the 0°C to 70°C commercial range is necessary.

Part Context

This part belongs to the LTC2637 family of octal DACs, which also includes 10-bit and 8-bit resolutions. Variants exist with different power-on reset behaviors (Z for zero-scale, MX for external reference mid-scale) and full-scale voltages (H for 4.096V). The MSOP package option provides a 16-lead alternative for designs requiring additional address pins CA1 and CA2.

Replacement Considerations

Direct functional equivalents within the same family include LTC2637CDE-HMI12#PBF for higher voltage swing or LTC2637IDE-LMI12#PBF for extended temperature ranges. Verify pin compatibility and software register mapping when substituting between resolution variants (8-bit vs 12-bit).