TDA4445 Pin-layout: 1. `IF` input 2. not to be connected 3. IF `AGC` time constant 4. not to be connected 5. not to be connected for TDA4445A 5. averaging capacitor for TDA4445B 6. not to be connected for TDA4445A 6. A.F. sound output for TDA4445B 7. not to be connected 8. reference L.C. network 9. reference L.C. network 10. not to be connected 11. supply voltage 12. `FM` modulated sound output 13. ground 14. not to be connected 15. not to be connected 16. `IF` input