LTC2640ACTS8-LM12#TRPBF

Overview

The LTC2640ACTS8-LM12#TRPBF is a single-channel, 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference providing a full-scale output of 2.5V with a temperature coefficient of 10ppm/°C. The device operates on a single supply voltage ranging from 2.7V to 5.5V and utilizes a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±1LSB for the A-grade part, a typical settling time of 4.1µs at 3V, and a supply current of 180µA at 3V. It incorporates a power-on reset circuit that defaults the output to mid-scale.

Feature Summary

• Integrated high-accuracy, low-drift reference yielding 2.5V full-scale output with 10ppm/°C drift
• 12-bit resolution with guaranteed monotonicity and maximum INL error of ±1LSB (A-Grade)
• Power-on reset to mid-scale (M suffix) for consistent system initialization
• Low power consumption: 180µA typical supply current at 3V; power-down mode reduces current to 1.8µA maximum

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable battery-powered equipment
• Optical networking devices

Procurement Notes

Verify the specific ordering suffix #TRMPBF indicates a 500-piece tape and reel packaging quantity, distinct from the standard #TRPBF which denotes 2,500 pieces. Confirm the C-grade temperature range (0°C to 70°C) aligns with application requirements. Ensure the mid-scale power-on reset configuration matches system startup needs. Cross-reference the manufacturer part number with authorized distributors to confirm availability and authenticity.

Selection Notes

Select this component when a 12-bit DAC with an integrated 2.5V reference is required in an 8-lead TSOT-23 package. The A-grade specification ensures tighter linearity performance (±1LSB INL) compared to standard grades. Choose the LM12 variant specifically for mid-scale power-on reset behavior. Verify that the 2.7V to 5.5V supply range and 0°C to 70°C operating temperature cover the design constraints. Consider the H-grade if automotive temperature ranges (-40°C to 125°C) or higher supply voltages are necessary.

Part Context

This part belongs to the LTC2640 family of single-channel SPI DACs. The 'A' denotes the electrical grade with ±1LSB maximum INL. The 'C' indicates the commercial temperature range. The 'TS8' specifies the 8-lead ThinSOT (TSOT-23) package. The 'LM12' suffix defines the 12-bit resolution, mid-scale power-on reset, and 2.5V internal reference. The '#TRMPBF' suffix indicates lead-free construction and a 500-unit tape and reel packaging format.

Replacement Considerations

Direct replacements within the same family include LTC2640ACTS8-LZ12#TRPBF for zero-scale reset or LTC2640ACTS8-HM12#TRPBF for automotive temperature range and 4.096V full-scale output. For external reference applications, verify compatibility with the REF pin configuration.