LTC2634IUD-LZ12#TRPBF

Overview

The LTC2634IUD-LZ12#TRPBF is a quad 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 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 a power-on reset to zero-scale. Communication is handled via a 3-wire SPI/MICROWIRE compatible interface supporting clock rates up to 50MHz. It is housed in a 16-lead 3mm × 3mm QFN package.

Feature Summary

• Quad 12-bit resolution with ±2.5 LSB maximum integral nonlinearity error
• Integrated 10ppm/°C precision reference providing 2.5V full-scale output
• Rail-to-rail output buffers with ultralow crosstalk (2.4nV•s)
• Power-on reset circuit configured for zero-scale initialization

Applications

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

Procurement Notes

Verify that the specific ordering suffix #TRPBF corresponds to the tape and reel packaging configuration required for automated assembly processes. Confirm the I-grade temperature rating (-40°C to 85°C) aligns with the operational environment specifications before finalizing procurement orders.

Selection Notes

Select this part when a quad-channel DAC with 12-bit accuracy and low noise is required. The LZ suffix ensures outputs initialize to zero volts upon power-up, which is critical for protecting downstream circuits. Ensure the system supply voltage remains within the 2.7V to 5.5V range specified for the LTC2634-L variant.

Part Context

This component belongs to the LTC2634 family of quad DACs, which also offers 10-bit and 8-bit resolutions. Variants are available with different full-scale voltages (2.5V or 4.096V), power-on reset behaviors (zero-scale or mid-scale), and temperature grades (commercial, industrial, automotive). The IUD designation specifically identifies the industrial temperature grade and 16-lead QFN package.

Replacement Considerations

Direct replacements within the same family include LTC2634IUD-LZ10#TRPBF (10-bit) or LTC2634IUD-LZ8#TRPBF (8-bit) if lower resolution is acceptable. For external reference applications, consider the LMX suffix variants. Verify pin compatibility as MSOP packages share similar functionality but differ in physical dimensions.

FAQ

What is the settling time for the LTC2634IUD-LZ12?

The typical settling time to ±1LSB (12-bit) is 4.2µs at VCC = 3V and 4.8µs at VCC = 5V.

How does the power-on reset function work for the LZ suffix?

The LZ suffix configures the device to clear all registers and reset the DAC voltage outputs to zero-scale immediately upon power application.

Is the LTC2634 guaranteed to be monotonic?

Yes, the LTC2634 is guaranteed monotonic over the entire operating temperature range of -40°C to 85°C.