LTC2634CUD-LMX8#PBF

Overview

The LTC2634CUD-LMX8#PBF 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 utilizes a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz. Key electrical parameters include a settling time of 3.3µs, maximum integral nonlinearity (INL) of ±0.5 LSB, and low noise of 0.75mVP-P (0.1Hz to 200kHz). It incorporates rail-to-rail output buffers, double-buffered data latches, and power-on reset to mid-scale in external reference mode.

Feature Summary

• Quad 8-bit DACs with integrated 10ppm/°C precision reference
• Rail-to-rail output buffers guaranteed monotonic over -40°C to 125°C
• 3-wire SPI/MICROWIRE interface operating at 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 applications

Procurement Notes

Verify the specific ordering suffix #PBF indicates lead-free compliance and RoHS adherence. Confirm the package type corresponds to the 16-lead QFN (3mm x 3mm) format. Ensure the temperature grade matches the required operational environment for the C-grade designation. Cross-reference the internal reference configuration with system requirements for mid-scale reset behavior.

Selection Notes

Select this component when a quad-channel 8-bit DAC with low crosstalk and fast settling is required. The L suffix denotes a 2.5V full-scale output suitable for 2.7V to 5.5V supplies. The MX suffix specifies mid-scale reset in external reference mode. Consider the QFN package for compact designs requiring exposed pad soldering for thermal management.

Part Context

This part belongs to the LTC2634 family, which includes 12-, 10-, and 8-bit variants. The CUD suffix identifies the commercial temperature range (0°C to 70°C) and the 16-lead QFN package. The LMX8 designation specifically configures the device for 8-bit resolution, 2.5V full-scale, and mid-scale reset in external reference mode.

Replacement Considerations

Direct substitutes within the same family include LTC2634CUD-LMI8#PBF (mid-scale reset in internal reference mode) or LTC2634CUD-LZ8#PBF (zero-scale reset). For higher resolution, consider LTC2634CUD-LMX10#PBF or LTC2634CUD-LMX12#PBF, ensuring pin compatibility and supply voltage constraints are met.