LTC2634CUD-LZ8#PBF

Overview

The LTC2634CUD-LZ8#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 a temperature coefficient of 10ppm/°C. The device operates on a single 2.7V to 5.5V supply and utilizes a 3-wire SPI/MICROWIRE compatible serial interface. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±0.5 LSB, a settling time of 3.3µs at 3V, and a typical supply current of 0.6mA. It incorporates rail-to-rail output buffers, double-buffered data latches, and a power-on reset circuit configured to clear outputs to zero-scale.

Feature Summary

• Quad 8-bit resolution with rail-to-rail output buffers
• Integrated 2.5V precision reference (10ppm/°C drift)
• Power-on reset to zero-scale for consistent initialization
• Ultralow DAC-to-DAC crosstalk (2.4nV•s typical)

Applications

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

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS adherence. Confirm the package type corresponds to the 16-lead QFN (UD) variant as indicated by the model code. Ensure the temperature grade 'C' matches the required commercial operating range of 0°C to 70°C for the application environment.

Selection Notes

Select this part when a low-cost, quad-channel DAC with integrated reference is required. The LZ8 suffix denotes 8-bit resolution, zero-scale power-on reset, and internal 2.5V reference. Compare against LTC2634-LZ10 or LZ12 if higher resolution is needed, or LTC2634-H variants if a 4.096V full-scale output is necessary.

Part Context

This component belongs to the LTC2634 family of quad DACs, which also includes 10-bit and 12-bit variants. The family shares identical pinouts and interface protocols but differs in resolution, linearity accuracy, and full-scale voltage options based on the internal reference configuration.

Replacement Considerations

Direct replacements within the same family include LTC2634CUD-LZ10#PBF (10-bit) and LTC2634CUD-LZ12#PBF (12-bit). These share the same package and interface but offer higher resolution. Verify that the increased resolution meets system requirements without affecting timing or power constraints.