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| Communication ICs Speech network for telephones BA8216 The BA8216 is a speech network IC which possesses the basic functions required for handset communications. In addition to amplifying signals from a transmitter and sending them to a telephone line, it also amplifies only reception signals from a telephone line and drives the receiver. FApplications Telephones and telephone equipment FFeatures 1) Basic speech network functions built in. S Handset transmit and receive circuits S DTMF transmit circuit S Key tone input circuit S Mute control and side tone masking circuits 2) Can be used with 1.3k loop circuit resistance and 100 telephone resistance. FBlock diagram 3) A BTL circuit is used for reception output, providing a wide dynamic range which enables use of a ceramic receiver. 4) Few external components required. 5) 14-pin DIP package. 238 Communication ICs FAbsolute maximum ratings (Ta = 25_C) BA8216 239 Communication ICs BA8216 FElectrical characteristics (unless otherwise noted, Ta = 25_C, S1 = 1, S2 =1, f = 1kHz, BPF = 400Hz to 30kHz) 240 Communication ICs FElectrical characteristic curves BA8216 241 Communication ICs FMeasurement circuits BA8216 242 Communication ICs BA8216 243 Communication ICs FMeasurement method (MUTE = HIGH) (1) Reception (1) Set S3 to R and S4 and S5 to OFF, and input a 1kHz signal from OSC1. Adjust to -10dBV if VM2 is piezoelectric, and to -30dBV if VM2 is electromagnetic. (2) With S4 OFF and S5 ON, record the output level of VM2 and note this value as VM2 (2). (3) With S4 ON and S5 ON, measure the output level of VM2, and note this value as VM2 3 . GR = 20log (VM2 3 / VM2 2 ) (2) Transmission (1) Set S3 = T and S4 and S5 to OFF, input a 1kHz signal from OSC2, and adjust so that VM1 is -10dBV. (2) With S4 OFF and S5 ON, record the output level of VM1 and note this value as VM1 2 . (3) With S4 ON and S5 ON, measure the output level of VM1, and note this value as VM1 3 . GMIC = 20log (VM1 3 / VM1 2 ) S3: Send and receive switch ( reception side) S4: ON / OFF switch for line resistance (1300) (OFF) S5: ON / OFF switch for parallel resistance (100) (OFF) BA8216 FCircuit opperation The BA8216 carries out the following basic operations. (1) Handset talk and receive The BA8216 receives a voice signal from a telephone line and outputs it to a handset speaker. It also takes a voice signal from the handset microphone and outputs it to the telephone line. (2) DTMF send and key tone input The BA8216 has a mute switch which can be switched between a "handset send and receive" mode and a "DTMF send and key tone input" mode by an external logic signal. In the "DTMF send and key tone input" mode, it transmits DTMF signals from the dial pad to the telephone line, and key tones to the handset receiver. FOperation notes The maximum power dissipation for the BA8216 is 900mW. Since the maximum power dissipation varies with temperature, the product of the applied voltage VL and the total current drawn by the IC, after factoring in the temperature, should not exceed the maximum dissipation. 244 Communication ICs FPin descriptions BA8216 FPin assignments 245 Communication ICs FApplication example BA8216 FExternal dimensions (Units: mm) 246 |
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