LTC2634CUD-HMX8#PBF

Overview

The LTC2634CUD-HMX8#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 includes rail-to-rail output buffers, guaranteed monotonicity over the temperature range, and communicates via a 3-wire SPI/MICROWIRE compatible interface. Key electrical parameters include a settling time of 3.3µs at ±1 LSB for 8-bit resolution, a maximum integral nonlinearity (INL) error of ±0.5 LSB, and a power-on reset configuration that sets outputs to mid-scale in external reference mode.

Feature Summary

• Quad 8-bit DAC architecture with integrated 10ppm/°C precision reference
• Rail-to-rail output buffers ensuring full signal swing capability
• SPI/MICROWIRE compatible 3-wire serial interface supporting up to 50MHz clock rates
• Power-on reset circuit configured for mid-scale output in external reference mode

Applications

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

Procurement Notes

Verify the specific ordering suffix #PBF confirms lead-free compliance and RoHS standards. Confirm the package type UD corresponds to the 16-lead QFN form factor. Ensure the temperature grade C matches the required commercial operating range of 0°C to 70°C for the target application environment.

Selection Notes

Select this part when a compact quad DAC solution with low crosstalk and high accuracy is required. The HMX suffix indicates mid-scale reset behavior suitable for applications where downstream circuits must remain active during power-up. Consider the 2.5V full-scale limit when designing output stages; use the H-series variants if a 4.096V span is necessary.

Part Context

This component belongs to the LTC2634 family, which offers 12-, 10-, and 8-bit resolutions in both QFN and MSOP packages. The CUD designation identifies the commercial temperature grade and 16-lead QFN packaging. The HMX8 variant specifically targets cost-sensitive applications requiring 8-bit precision with defined power-up states.

Replacement Considerations

Direct functional substitutes within the same family include the LTC2634CUD-LMX8#PBF (zero-scale reset) or LTC2634CUD-HMX8#PBF (4.096V full-scale). Cross-family replacements like the LTC2635 series require interface adaptation due to I2C compatibility differences.