PCF7938XA/LAAB3800

RF Transmitter Overview

The PCF7938XA/LAAB3800 is a highly integrated UHF transmitter IC based on fractional-N PLL architecture, designed for ISM-band applications. It supports frequencies of 315, 434, 868, and 915 MHz with programmable OOK/ASK/FSK modulation. The device features an on-chip VCO and loop filter, enabling low external component count. It operates at 7 mA during transmission at 6 dBm output power. Independent power-down modes reduce current to 50 nA. Available in HVQFN16 (3x3 mm) or TSSOP16 packages.

RF Transmitter Feature Summary

• Single-chip fractional-N PLL transmitter supporting multiple ISM/SRD bands
• Programmable modulation properties including OOK, ASK, and FSK
• Integrated oscillator and PLL loop filter minimizing external components
• Low power operation with independent power-down modes

RF Transmitter Applications

• Automotive Garage Door Opener
• Passive Keyless Entry (PKE)
• Remote Control
• Remote Keyless Entry (RKE)
• Tire Pressure Monitoring (TPMS)

RF Transmitter Procurement Notes

Verify the specific ordering suffix matches the required package type, as options include HVQFN16 and TSSOP16. Confirm that the frequency band configuration aligns with regional regulatory requirements for the target application. Ensure the supply chain source provides original manufacturer documentation to validate authenticity and revision status before integration into production designs.

RF Transmitter Selection Notes

Select this component when a single-chip solution for UHF ISM bands is required to minimize bill of materials. It is suitable for systems needing flexible modulation schemes and low standby current. Consider the small footprint if space constraints are critical. Evaluate the need for independent power-down features to optimize battery life in remote control applications.

RF Transmitter Part Context

This part belongs to the PCF7938 series of UHF transmitters from NXP Semiconductors. It is designed for high integration and low cost in wireless control applications. The series supports various packaging options to accommodate different PCB layout requirements. It complements other RF solutions by providing a complete transmitter function in a compact form factor.

RF Transmitter Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing system designs if considering alternative transmitters.