LTC2634IUD-LMX8#TRPBF

Overview

The LTC2634IUD-LMX8#TRPBF is a quad 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 rail-to-rail output buffers, guaranteed monotonicity over the -40°C to 85°C industrial temperature range, and low noise characteristics. Communication is handled via a 3-wire SPI/MICROWIRE compatible interface supporting clock rates up to 50MHz. This specific variant resets to mid-scale in external reference mode upon power-up and is supplied in a 16-lead QFN package.

Feature Summary

• Quad 8-bit DACs with integrated 2.5V full-scale precision reference
• Rail-to-rail output buffers with ultralow crosstalk (2.4nV•s)
• SPI/MICROWIRE compatible 3-wire serial interface up to 50MHz
• Power-on reset to mid-scale in external reference mode

Applications

• Mobile communications
• Process control and industrial automation
• Automatic test equipment
• Portable equipment
• Automotive systems

Procurement Notes

Verify that the #TRPBF suffix indicates tape and reel packaging containing 2,500 pieces. Confirm the I-grade designation matches the required -40°C to 85°C operating temperature range for the target application environment.

Selection Notes

Select this part when four independent 8-bit channels are required with a 2.5V internal reference. Ensure the system utilizes an external reference if the mid-scale power-on reset behavior is preferred over zero-scale initialization. Verify that the 16-lead QFN footprint fits the PCB layout constraints.

Part Context

This component belongs to the LTC2634 family, which offers 12-, 10-, and 8-bit resolutions in both QFN and MSOP packages. The 'I' denotes the industrial temperature grade, while 'LMX' specifies the mid-scale reset configuration for external reference operation. The '#TRPBF' suffix confirms lead-free construction and tape-and-reel shipping format.

Replacement Considerations

LTC2634CUD-LMX8#TRPBF: Identical electrical specifications but rated for commercial temperature range (0°C to 70°C).

FAQ

What is the default output state after power-up?

The LTC2634IUD-LMX8#TRPBF resets to mid-scale in external reference mode upon power-up.

Does this device support daisy-chain operation?

No, the SDO pin for daisy-chaining is only available in the QFN package version; however, this part uses the QFN package, so it supports daisy-chain operation.

What is the maximum serial clock frequency?

The serial interface supports clock rates up to 50MHz.