LTC2640AHTS8-HM12#TRPBF

Overview

The LTC2640AHTS8-HM12#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 4.096V and operates within a supply voltage range of 4.5V to 5.5V. The device incorporates a rail-to-rail output buffer guaranteed monotonic over temperature, with a maximum integral nonlinearity (INL) error of ±1LSB. It utilizes a 3-wire SPI/MICROWIRE compatible serial interface supporting clock rates up to 50MHz. Power-on reset options include mid-scale initialization, and the unit is housed in an 8-lead TSOT-23 package.

Feature Summary

• 12-bit resolution with ±1LSB maximum INL error
• Integrated 4.096V full-scale reference with 10ppm/°C drift
• Rail-to-rail output buffer guaranteed monotonic
• Power-on reset to mid-scale via REF_SEL pin

Applications

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

Procurement Notes

Verify the H-grade designation confirms operation from –40°C to +125°C. Confirm the M suffix indicates power-on reset to mid-scale rather than zero-scale. Ensure the TRPBF suffix corresponds to the required tape and reel packaging quantity for production integration.

Selection Notes

Select this part when a 4.096V internal reference is required with high accuracy. The H-grade is necessary for automotive or wide industrial temperature ranges. Verify that the 4.5V minimum supply voltage aligns with the system power rails, as lower voltage variants are available for 2.7V systems.

Part Context

This component belongs to the LTC2640 family of single-channel DACs. The specific suffixes define its electrical characteristics: 'A' denotes the ±1LSB INL grade, 'H' specifies the automotive temperature range, 'M' sets the power-on reset state to mid-scale, and '12' indicates 12-bit resolution. Other family members offer different resolutions, reset states, or commercial temperature grades.

Replacement Considerations

Direct replacements within the same family include LTC2640AHZ12#TRPBF (zero-scale reset) or LTC2640AITS8-HM12#TRMPBF (industrial grade). Cross-family substitution requires verifying pin compatibility and reference voltage specifications.

FAQ

What is the function of Pin 8 on the LTC2640AHTS8-HM12?

Pin 8 is the REF_SEL input. Tying it to VCC selects the internal reference at power-up, which configures the device for mid-scale reset operation.

How does the LTC2640 handle power-on glitches?

The device includes circuitry to reduce power-on glitches. If the power supply ramps to 5V in 1ms or more, the analog output typically rises less than 5mV above zero-scale during power-on.

What is the settling time for the 12-bit version at 5V supply?

The typical settling time to ±1LSB for the 12-bit version at VCC = 5V is 4.6µs.