LTC2640ITS8-LM8#TRPBF

Overview

The LTC2640ITS8-LM8#TRPBF is a single-channel, 8-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 2.7V to 5.5V supply. The device includes a rail-to-rail output buffer guaranteed monotonic over temperature. It utilizes a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz. Key electrical parameters include a typical supply current of 180µA at 3V, a settling time of 3.2µs for ±1LSB accuracy, and a power-down mode consuming a maximum of 1.8µA. The part incorporates a power-on reset circuit that initializes the output to mid-scale.

Feature Summary

• Integrated 10ppm/°C precision reference providing a 2.5V full-scale output
• Rail-to-rail output buffer guaranteed monotonic over the operating temperature range
• Power-on reset function sets output to mid-scale upon initialization
• Low power consumption with 180µA typical supply current and 1.8µA maximum in power-down mode

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 #TRPBF corresponds to the required tape and reel packaging quantity as defined by the manufacturer's standard specifications. Confirm that the I-grade temperature rating (-40°C to 85°C) aligns with the environmental requirements of the target application. Ensure compatibility with the 8-lead TSOT-23 package dimensions during PCB layout design.

Selection Notes

Select this component when an 8-bit resolution is sufficient for the application, offering higher speed and lower power compared to 12-bit variants. The LM suffix indicates a mid-scale power-on reset, which is suitable for systems where downstream circuits can tolerate a non-zero initial output. Choose this part over the H-grade if the system operates below 4.5V, as the H-grade requires a minimum 4.5V supply for its 4.096V reference configuration.

Part Context

This device belongs to the LTC2640 family of single-channel DACs available in 8-, 10-, and 12-bit resolutions. The LTS8 designation identifies the 8-lead ThinSOT (TSOT-23) plastic package. The 'I' suffix denotes the Industrial temperature grade, covering -40°C to 85°C. The 'M' suffix specifies the Power-On Reset behavior, initializing the DAC output to mid-scale rather than zero-scale.

Replacement Considerations

Direct functional substitutes within the same family include the LTC2640ITS8-LZ8#TRPBF, which offers identical electrical performance but resets to zero-scale instead of mid-scale. Other valid replacements are the 10-bit LTC2640ITS8-LM10#TRPBF and the 12-bit LTC2640ITS8-LM12#TRPBF, provided the increased resolution and slightly longer settling times are acceptable for the design.