ANALOG PRODUCT DIVISION
PA1418 Technical Note
This is a reference note for Protek Analog’s PA1418. The document includes data for the IC, recommended
external components, and other pertinent information.
Please read all instructions and recommendations before beginning to design any product that is to include this
device. This document contains a checklist to reference before powering up completed circuit and
troubleshooting procedures outlining causes and countermeasures for issues arising in the application of the IC.
Contact information is included if this document is insufficient to answer any problems or questions that may
1.2. Block Diagrams
24TSSOP Pin out
32 QFN Pin out
1.3. Absolute Maximum Ratings
1.4. Operating Range
4. Explanation of External Parts.
4.3. Low-Pass Filter
4.4. Half VDD Filter
4.5. Composite Signal Adjust
4.6. RF Oscillator
4.7. RF Output
4.8. X’TAL Oscillator
4.9. Serial Data Input
4.10. Phase Lock Loop
4.11. Audio Mute
4.12. Pilot Signal Adjust
5. PCB Sample and Recommendations.
The PA1418 is a Radio Transmitter that can send audio signals from personal computers, game consoles or
independent devices to any type of audio equipment with a built in FM receiver.
The IC consists of a Pre-Emphasis circuit that improves Signal to Noise Ratio (S/N), a Limiter circuit that
prevents over-modulation and a low Pass filter (LPF) circuit that limits the maximum modulation frequency. The
Stereo modulation circuit generates stereo composite signals through a FM transmitter circuit with Phase-
Locked Loop (PLL) frequency synthesizers.
1. 1. Features
1. Improved Audio Quality due to integrated Pre-emphasis, limiter and Low-pass filter circuits.
2. Pilot tone FM stereo modulation circuit is integrated.
3. An incorporated PLL frequency synthesizer ensures a stable FM transmission frequency.
4. Device utilizes a serial data control method to set the frequency via a microcontroller.
5. Integrated mute option.
561 E Elliot Road. Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (480) 632-1715.
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