LTC2640AHTS8-LM12#TRMPBF

Overview

The LTC2640AHTS8-LM12#TRMPBF is a single-channel, 12-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 operates on a single supply voltage ranging from 2.7V to 5.5V. The device incorporates a rail-to-rail output buffer guaranteed monotonic over temperature. Key electrical parameters include a maximum integral nonlinearity (INL) error of ±1 LSB, a typical settling time of 4.1µs at 3V, and a power supply current of 180µA at 3V. It utilizes a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz.

Feature Summary

• Integrated 10ppm/°C precision reference providing a 2.5V full-scale output
• Maximum INL error of ±1 LSB for the A-grade 12-bit resolution
• Rail-to-rail output buffer guaranteed monotonic over temperature
• Power-on reset to mid-scale configuration

Applications

• Mobile Communications
• Process Control and Industrial Automation
• Automatic Test Equipment
• Portable Equipment
• Automotive Systems

Procurement Notes

Verify the specific suffix #TRMPBF indicates a 500-piece tape and reel packaging quantity as defined in the datasheet ordering information. Confirm the H-temperature grade corresponds to the automotive range of –40°C to 125°C. Ensure the LM12 designation matches the required mid-scale power-on reset and 2.5V internal reference configuration.

Selection Notes

Select this part when a 12-bit resolution with high accuracy (±1 LSB INL) is required in a compact 8-lead TSOT-23 package. Choose the H-grade variant if operation within the –40°C to 125°C temperature range is necessary. The LM suffix is appropriate for applications requiring a mid-scale output upon power-up, whereas the LZ suffix would be selected for zero-scale initialization.

Part Context

This component belongs to the LTC2640 family of single DACs available in 12-, 10-, and 8-bit resolutions. The family offers combinations of full-scale voltages (2.5V or 4.096V) and power-on reset options (zero or mid-scale). The A-grade designation specifically denotes the tighter linearity specification compared to standard grades.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.

FAQ

What is the function of Pin 8 on the LTC2640AHTS8-LM12?

Pin 8 serves as REF_SEL (Reference Select). Tying it to VCC selects the internal reference, while tying it to GND selects external reference mode.

How does the power-on reset behavior differ between the LM and LZ suffixes?

The LM suffix resets the DAC output to mid-scale upon power-up, while the LZ suffix resets the output to zero-scale.

What is the maximum operating supply voltage for the LTC2640-L series?

The LTC2640-L series operates from a single supply voltage ranging from 2.7V to 5.5V.