LTC2640ITS8-LZ10#TRMPBF

Overview

The LTC2640ITS8-LZ10#TRMPBF is a single-channel, 10-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 and operates on a single supply ranging from 2.7V to 5.5V. The device incorporates 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 settling time of 3.8µs, a maximum integral nonlinearity (INL) error of ±1 LSB, and a power-down current of 1.8µA maximum. The component is housed in an 8-lead TSOT-23 package.

Feature Summary

• Integrated 10ppm/°C precision reference with 2.5V full-scale output
• SPI/MICROWIRE compatible 3-wire serial interface supporting up to 50MHz clock
• Rail-to-rail output buffer guaranteed monotonic over temperature
• Power-on reset circuit configured to clear output to zero-scale

Applications

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

Procurement Notes

Verify the specific suffix #TRMPBF indicates a 500-piece tape and reel packaging configuration as defined in the manufacturer's ordering guide. Confirm that the 'I' grade designation matches the required industrial operating temperature range of –40°C to 85°C for the target application environment.

Selection Notes

Select this part when a 10-bit resolution with a 2.5V internal reference is required in a compact 8-lead TSOT-23 footprint. Ensure the system supply voltage remains within the 2.7V to 5.5V range. Choose this variant over the 'M' grade if a zero-scale power-on reset state is necessary for system initialization safety.

Part Context

This component belongs to the LTC2640 family of single-channel DACs available in 8-, 10-, and 12-bit resolutions. The 'L' designation specifies the 2.5V full-scale internal reference variant, while 'Z' denotes the zero-scale power-on reset option. The 'TS8' package code identifies the 8-lead ThinSOT plastic housing used for space-constrained designs.

Replacement Considerations

Direct functional substitutes within the same family include the LTC2640IMS8-LZ10#TRMPBF (Mid-Scale reset) or the LTC2640HTS8-LZ10#TRMPBF (Automotive grade). Verify pin compatibility and thermal performance requirements when considering these alternatives.

FAQ

What is the default output state upon power-up?

The LTC2640ITS8-LZ10#TRMPBF is configured with the 'Z' suffix, which ensures the DAC output resets to zero-scale immediately after power is applied.

Can the internal reference be disabled?

Yes, the device supports an External Reference mode where the internal reference is bypassed, allowing the full-scale output to be set by a voltage supplied to the REF pin.

What is the maximum serial clock frequency?

The SPI/MICROWIRE compatible serial interface supports clock rates up to 50MHz.