PBL38813 Ericsson Microelectronics, PBL38813 Datasheet
PBL38813
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PBL38813 Summary of contents
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Voice-switched Speakerphone Circuit with built in loudspeaker amplifier Description. The PBL 388 13 contains all the necessary circuitry, amplifiers, detectors, comparator and control functions to implement a high performance, voice-switched, loudspeaking, ”hands-free ” telephone. The gain dynamics (attenuation between channels) ...
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PBL 388 13 Maximum Ratings Parameter Speech switch supply current Speaker amplifier supply current Voltage pin 1-14 Operating temperature Storage temperature 100 F/16V ...
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Electrical Characteristics kHz = CTR TxDet I =1.0mA unless otherwise noted. D Parameter Speech control section Terminal voltage Internal reference voltage, V Ref Frequency response for ...
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PBL 388 13 Parameter N leakage current (hold), I Det NDet N swing relative Det Ref NDet CMP (comparator) sensitivity, transmit (Tx) mode to receive (Rx) mode or vice versa CTR voltage for 25 dB dynamics, ...
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F2out 3 4 Txout TxDetin 5 6 TxDetout N Det 7 CMP 8 RxDetout 9 RxDetin 10 Rxout 11 F5out 12 24 pin DIP Figure 6. Pin configuration. Pin Descriptions Refer to figure 6. (24 pin ...
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PBL 388 – CTR 4 T xout xin xin 7 ...
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Figure 9. Transmitter channel input amplifier used to suppress ripple in the mic. supply. (CMRR 100k Figure 10. Transmitter and receiver channel rectifier characteristics. Figure 11. Relationship ...
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PBL 388 13 dB Transmit ____ gain = =V+ CTR =open CTR -60 -40 -20 Figure 13. Transmit and receive gain as a function of V Rxdet Txdet A B Full recieve level ...
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Transmitter channel output 24 CTR R Tx out Mic. C Figure 16. Speech switching arrangement. decreases with ...
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PBL 388 13 Loudspeaker amplifier The loudspeaker amplifier drives directly impedance loudspeaker. The amplifier is designed to work under a number of different power supply conditions. Fig. 17, 18 and 23. The highest output swing is ...
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Speech Figure 23. Loudspeaker amplifier ...
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PBL 388 Figure 26. Power amplifier systems. push - pull A power amplifier in a handsfree telephone that is supplied from the line. Comparison between single ended and push-pull output stage. The amplifier has to have as ...
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Hook switch 620 Telephone 4x1N4007 line in. MIC.1 620 handsfree 47k 68nF 820 820 MIC.2 Figure 27. Application. 10 DTMF AD 47nF 47nF 220nF 100 100 4,7k 18K ...
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PBL 388 13 Hints how to design a handsfree telephone with PBL 388 13. To design the speech control function, seven different signal paths have to be considered and understood. See fig. 28. The signal paths the acoustic ...
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If a simple telephone casing is considered, it could be a box with a large hole for the loudspeaker and a small hole for the microphone. This would normally not function. The ...
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PBL 388 13 will help the balance in the speech switching a lot if the telephone is placed in a noisy surrounding. It can not be required that the other party has to know that he is talking with somebody ...