LTC2637IMS-LZ12#PBF

Overview

The LTC2637IMS-LZ12#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, providing a full-scale output of 2.5V. The device operates on a single supply voltage ranging from 2.7V to 5.5V and utilizes 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 ±2.5 LSB, low noise performance of 0.75mVP-P (0.1Hz to 200kHz), and rail-to-rail output buffers that are guaranteed monotonic over the industrial temperature range of –40°C to 85°C.

Feature Summary

• Octal architecture with 12-bit resolution and integrated 10ppm/°C precision reference
• Rail-to-rail output buffers guaranteed monotonic over –40°C to 85°C
• I2C-compatible serial interface with selectable internal or external reference modes
• Power-on reset circuit configurable to zero-scale or mid-scale

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 #PBF indicates lead-free construction compliant with RoHS standards. Confirm the IMS package designation corresponds to the 16-lead MSOP form factor required for the target PCB layout. Ensure the LZ12 suffix matches the required 12-bit resolution and zero-scale power-on reset behavior. Cross-reference the I-grade temperature rating against the application's environmental operating limits.

Selection Notes

Select this component when multiple independent voltage outputs are required in a compact footprint. The 12-bit resolution provides adequate precision for general-purpose analog control. The integrated reference eliminates the need for external high-accuracy components, reducing board space. Verify that the 2.7V to 5.5V supply range aligns with the system power rails. Consider the I2C bus speed requirements, as the device supports up to 400kHz for faster data updates.

Part Context

This part belongs to the LTC2637 family, which includes variants with 8-bit and 10-bit resolutions. Other options in the series feature different full-scale voltages, such as 4.096V for the H-grade parts, or alternative power-on reset behaviors like mid-scale initialization. The family shares identical pinouts and functional blocks, allowing for design flexibility across different resolution and voltage requirements within the same package styles.

Replacement Considerations

Direct replacements within the same family include LTC2637IMS-LZ10#PBF for 10-bit resolution or LTC2637IMS-LZ8#PBF for 8-bit resolution, maintaining identical pinouts and interfaces. For higher precision needs, consider the LTC2635 quad-channel variant if fewer channels suffice. Ensure any substitute maintains the 16-lead MSOP package and industrial temperature grade.