TS34118

TS34118 Voice Switched Speakerphone Circuit SOP-28 Pin Definition: 1. FO 8. TXO 2. FI 9. TXI 3. CD 10. MCO 4. Vcc 11. MCI 5. HTO+ 12. MUT 6. HTO- 13. VLC 7. HTI 14. CT 15. VB 16. CPT 17. TLI2 18. TLO2 19. RLO2 20. RLI2 21. RXI 22. Gnd 23. TLI1 24. TLO1 25. RLO1 26. RLI1 27. CPR 28. GND General Description The TS34118 Voice Switched Speakerphone Circuit incorporates the necessary amplifiers, attenuators, level detectors, and control algorithm to form the heart of a high quality hands-free speakerphone system. Included are a microphone amplifier with adjustable gain and MUTE control, Transmit and Receive attenuators which operate in a complementary manner, level detectors at both input and output of both attenuators, and background noise monitors for both the transmit and receive channels. A Dial Tone Detector prevents the dial being attenuated by the Receive background noise monitor circuit. Also included are two line drive amplifiers which can be used to form a hybrid n...