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MC34216ADW bảng dữ liệu(PDF) 9 Page - Motorola, Inc |
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MC34216ADW bảng dữ liệu(HTML) 9 Page - Motorola, Inc |
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9 / 20 page  MC34216A 9 MOTOROLA ANALOG IC DEVICE DATA T2 C7 RXO1 Z0 Z21 Z1 T3 C20 R6 R9 C5 R12 R20 RXO2 TXI Mic AHO1 MTC MTF AHO2 RXI LAO Gnd V HYN NDC SAO LAI IMP I Supply– Stabilizer References DC Mask Generation AC Termination 2–4 Wire Conversion Line Length AGC Protection C12 Line + Line – 26 27 25 6 7 1 21 22 8 2 3 4 10 11 14 9 13 20 Anti–Howling Line Driver Ear Mic Mute, AGC MC34216A C17 AGC 28 ref CC Mute, AGC CM C16 12 To IMP To SAI To IMP Ring– AGnd 5 RS 19 Clk 18 D/HS 17 Regulator DTMF/Tone and Ring Generator Micro– Interface Clock Hook–Detect Osc 16 X1 LPO R30 LPI 23 24 LSP C24 Volume Microphone Threshold C29 C28 C27 C26 C25 To IMP C21 R28 To Micro– controller R1 SAI 15 Handset Earpiece Handset Microphone Speaker Figure 2. Block Diagram of the MC34216A with Essential Components DC CHARACTERISTICS AND STARTUP 2 1 3 4 VLC IVLP ILK ILP VLK ILC VLP V I 0 line line Region 1: Startup, Low Line Current, High Slope Region 2: Mid Range Line Current, Small Slope Region 3: High Line Current, High Slope Region 4: Overload Protection Figure 3. General Form of the DC Mask of the MC34216A The MC34216A offers the possibility to adjust the dc characteristics of all 4 regions via both software and hardware adjustments. The software adjustments make it possible to program the 4 different basic masks: France, United Kingdom, Low Voltage and Startup. The hardware adjustments can be used for fine–tuning. The adjustment possibilities will be discussed below with the aid of the block diagram of Figure 4. In Region 1, the transfer of the amplifier G at the HYN input equals zero. The voltage difference between SAO and SAI will equal VO1. The slope RE1 of the Vline, Iline characteristic will equal: R E1 + R1 x 1 ) Z0 Z21 In Region 2, the output current of the amplifier G will be proportional to the input current. As a result, the voltage between SAO and SAI will increase with the line voltage. Speech signals on the line are of no influence on this because they are filtered out via capacitor C16. The slope RE2 of the Vline, Iline characteristic will equal: R E2 + R1 x 1 ) 1 Ri Z1 ) Z21 Z0 In Region 3, the output current of the amplifier G is kept constant. As a result, the slope in Region 3 will equal the slope of Region 1. |
Số phần tương tự - MC34216ADW |
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Mô tả tương tự - MC34216ADW |
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