mc34216 Freescale Semiconductor, Inc, mc34216 Datasheet
mc34216
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mc34216 Summary of contents
Page 1
... Programmable Telephone Line Interface Circuit with Loudspeaker Amplifier The MC34216 is developed for use in telephone applications where besides the standard telephone functions also the group listening–in feature is required. In cooperation with a microcontroller, the circuit performs all basic telephone functions including DTMF generation and pulse dialing. The listening– ...
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... LPI 25 RXI 26 RXO1 27 RXO2 28 AGC 2 MC34216 PIN FUNCTION DESCRIPTION Description Anti–Howling Timing, Speakerphone Input Anti–Howling Timing, Low Voltage Line Driver Disable Microphone Threshold Filtering Microphone Threshold Timing Small Signal Ground Microphone Amplifier Input Microphone Bias Current Sink Line Driver Amplifier Output ...
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... Ear Earpiece Handset Mic MIcrophone Base LSP Loudspeaker With the MC34216, a microcontroller and a switched mode power supply, a telephone set with listening–in function and ringing via loudspeaker can be built as shown in Figure 1. Hookswitch A/B Loudspeaker MOTOROLA ANALOG IC DEVICE DATA MC34216 Simplified Block Diagram ...
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... Figure 2. Block Diagram of the MC34216 with Essential Components Line + C17 To IMP C20 RXO1 26 Ear RXO2 R6 27 RXI Mute, AGC TXI Mute, AGC 6 Mic Mic C24 Volume 7 LPO 23 LSP R30 LPI 24 R28 AGC 28 C21 C25 Line – A1, A0 Data Symbol 00 D0 ...
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... When off–hook, the loop current flows through transistor T2 and supplies the externals (microcontroller, etc which is stabilized by the MC34216. The V–I line characteristic is programmed by the microcontroller and adjusted by the external components Z0, Z1, Z21 and R1 which are in a regulator loop, acting on transistor T2. The ac impedance is generated in a similar way ...