LTC2640AHTS8-LM12#TRPBF

Overview

The LTC2640AHTS8-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 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, a typical settling time of 4.1µs at 3V, and a supply current of 180µA at 3V. The part is housed in an 8-lead TSOT-23 package and supports power-on reset to mid-scale.

Feature Summary

• Integrated 10ppm/°C precision reference with 2.5V full-scale output
• High accuracy: Maximum INL error of ±1LSB for the A-grade device
• Low power consumption: 180µA operating current, down to 1.8µA in power-down mode
• Dual functionality: Pin 8 configured as REF_SEL for internal/external reference selection

Applications

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

Procurement Notes

Verify the specific ordering suffix #TRPBF indicates a 2,500-piece tape and reel packaging quantity. Confirm that the 'H' temperature grade designation corresponds to the automotive range of –40°C to 125°C. Ensure compatibility with the 8-lead TSOT-23 (ThinSOT) footprint during PCB layout. Cross-reference the datasheet revision date to confirm pinout consistency for the REF_SEL function on Pin 8.

Selection Notes

Select this part when a 12-bit resolution with high linearity (±1LSB INL) is required in a compact surface-mount package. The 'H' grade is necessary for environments requiring operation up to 125°C. Choose the 'M' power-on reset option if the system requires a known mid-scale state upon startup rather than zero-scale. Verify that the 2.5V internal reference range meets the application's output voltage requirements.

Part Context

This component belongs to the LTC2640 family of single-channel DACs. Variants within the family differ by resolution (8-, 10-, or 12-bit), temperature grade (C, I, or H), and power-on reset behavior (Zero or Mid-scale). The 'A' suffix denotes the highest accuracy grade with ±1LSB maximum INL. The 'L' designation indicates the 2.5V full-scale version powered by a 2.7V–5.5V supply, distinct from the 'H' version which offers 4.096V full-scale but requires a 4.5V–5.5V supply.

Replacement Considerations

Direct replacements within the same family include LTC2640AITS8-LM12#TRMPBF (different packaging quantity) or LTC2640AHTS8-LZ12#TRMPBF (Zero-scale reset instead of Mid-scale). For external reference applications, verify that the replacement maintains the same REF_SEL pin configuration on Pin 8.