LTC2631ITS8-LZ8#TRMPBF

Overview

The LTC2631ITS8-LZ8#TRMPBF is an 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices Inc., housed in an 8-lead TSOT-23 package. It features a rail-to-rail output buffer and operates on a single 2.7V to 5.5V supply. The device includes an integrated precision reference with a full-scale output of 2.5V and a temperature coefficient of 10ppm/°C. Communication is handled via a 2-wire I²C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. It incorporates a power-on reset circuit that defaults the output to zero-scale upon initialization.

Feature Summary

• Integrated 10ppm/°C precision reference providing a 2.5V full-scale output
• Rail-to-rail buffered output guaranteed monotonic over temperature
• I²C serial interface with selectable addresses and power-on reset to zero-scale
• Low power consumption: 180µA at 3V, down to 1.8µA maximum in power-down mode

Applications

• Mobile communications
• Process control and industrial automation
• Automatic test equipment
• Portable equipment
• Automotive systems
• Optical networking

Procurement Notes

Verify the specific ordering suffix #TRMPBF indicates a 500-unit tape and reel configuration as defined in the manufacturer's documentation. Confirm the 'L' designation corresponds to the 2.5V internal reference and the 'Z' designation ensures a zero-scale power-on reset state. Ensure the 'I' grade meets the required operating temperature range of –40°C to 85°C for the intended application environment.

Selection Notes

Select this component when an 8-bit resolution is sufficient for the application requirements. The 'L' suffix specifies a 2.5V full-scale output suitable for lower voltage systems, while the 'H' variant provides 4.096V. The 'Z' suffix is critical if system safety requires the DAC output to default to zero volts upon power-up. Verify that the I²C address pins CA0 and CA1 are configured correctly to avoid bus conflicts with other devices.

Part Context

This part belongs to the LTC2631 family of single-channel DACs available in 8-, 10-, and 12-bit resolutions. The family shares a common pinout and I²C interface but varies in accuracy, reference voltage, and power-on reset behavior. The LTS8 package denotes the 8-lead ThinSOT plastic package, offering a compact footprint for space-constrained designs compared to larger QFN or MSOP packages found in multi-channel variants like the LTC2635.

Replacement Considerations

Direct functional substitutes within the same package include other LTC2631 variants such as LTC2631ITS8-LZ10#TRMPBF (10-bit) or LTC2631ITS8-HZ8#TRMPBF (4.096V reference). When replacing, ensure the new part's resolution and full-scale voltage match the system design. If the original part used external reference mode, verify that the replacement supports the REF_SEL pin configuration appropriately.