LTC2640AHTS8-LZ12#TRPBF

Overview

The LTC2640AHTS8-LZ12#TRPBF 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 ranging from 2.7V to 5.5V. The device includes a rail-to-rail output buffer guaranteed monotonic over temperature, with a maximum integral nonlinearity error of ±1LSB. It utilizes a 3-wire SPI/MICROWIRE compatible serial interface supporting clock rates up to 50MHz. Power-on reset options allow the output to initialize to zero-scale or mid-scale.

Feature Summary

• Integrated high-accuracy reference providing 2.5V full-scale output with 10ppm/°C drift
• Maximum INL error of ±1LSB for 12-bit resolution
• Rail-to-rail output buffer guaranteed monotonic over temperature
• Power-on reset to zero-scale via asynchronous CLR pin

Applications

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

Procurement Notes

Verify the specific suffix #TRPBF indicates a 2,500-piece tape and reel packaging configuration. Confirm the H-grade designation corresponds to the automotive temperature range of –40°C to 125°C. Ensure the LZ12 code matches the 2.5V full-scale voltage and zero-scale power-on reset requirement.

Selection Notes

Select this part when a 12-bit DAC with ±1LSB maximum INL is required in a compact 8-lead TSOT-23 package. Choose the H-grade variant if operation beyond the commercial temperature range up to 125°C is necessary. Verify that the 2.7V to 5.5V supply range aligns with the system power architecture.

Part Context

This component belongs to the LTC2640 family of single-channel DACs. Variants within the family differ by resolution (8, 10, or 12 bits), full-scale voltage (2.5V or 4.096V), and power-on reset behavior (zero or mid-scale). The A grade specifically denotes the tighter linearity specification compared to standard grades.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

What is the function of Pin 8 (CLR) on the LTC2640AHTS8?

Pin 8 serves as an asynchronous clear input. When driven low, it clears all internal registers and forces the DAC voltage output to reset to zero-scale.

How does the REF pin operate in this device?

In internal reference mode, the REF pin provides access to the 1.25V internal reference output. In external reference mode, it acts as an input where an applied voltage sets the full-scale output.

What is the settling time for the LTC2640A at 12-bit resolution?

The typical settling time to ±1LSB is 4.1µs at VCC = 3V and 4.6µs at VCC = 5V.