LTC2637IMS-LZ8#PBF

Overview

The LTC2637IMS-LZ8#PBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference with a full-scale output of 2.5V and a temperature coefficient of 10ppm/°C. The device operates on a single 2.7V to 5.5V supply and utilizes a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Each channel includes a rail-to-rail output buffer guaranteed monotonic over the industrial temperature range (-40°C to 85°C). Power-on reset defaults to zero-scale, and the component is housed in a 16-lead MSOP package.

Feature Summary

• Octal architecture with 8 independent 8-bit DAC channels
• Integrated 2.5V precision reference with 10ppm/°C drift
• Rail-to-rail buffered outputs guaranteed monotonic
• I2C interface with selectable slave addresses via CA pins

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 suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the IMS designation corresponds to the 16-lead MSOP package type and the LZ8 code specifies the 8-bit resolution with zero-scale power-on reset behavior. Ensure the supplier provides documentation confirming the industrial temperature grade (-40°C to 85°C) for this specific part number.

Selection Notes

Select this component when eight low-cost, low-power voltage outputs are required with minimal external reference circuitry. The 8-bit resolution suits applications where high precision is not critical but channel count and cost efficiency are priorities. Verify that the 2.5V internal full-scale range meets system requirements; otherwise, consider the H-grade variant for 4.096V or external reference configurations.

Part Context

This part belongs to the LTC2637 family, which also offers 10-bit and 12-bit resolutions (LTC2637-10, LTC2637-12) and alternative power-on reset behaviors (mid-scale). The IMS package variant differs from the DE DFN package in pin count and thermal characteristics. The LZ8 suffix specifically denotes the 8-bit resolution combined with the zero-scale reset option, distinguishing it from LMI (mid-scale internal) or LMX (mid-scale external) variants.

Replacement Considerations

Direct replacements within the same family include LTC2637IMS-LZ10#PBF (10-bit) or LTC2637IMS-LZ12#PBF (12-bit) if higher resolution is needed. For mid-scale reset behavior, consider LTC2637IMS-LMI8#PBF. Ensure any substitute maintains the 16-lead MSOP footprint and I2C compatibility.