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L6726G-S18-R 데이터시트(PDF) 8 Page - Unisonic Technologies |
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L6726G-S18-R 데이터시트(HTML) 8 Page - Unisonic Technologies |
8 / 13 page L6726 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 8 of 13 www.unisonic.com.tw QW-R108-015, C APPLICATION INFORMATION Refer to fig. 6 Gain regulation (R1, R2): These resistors set the starting point for the gain-and side tone regulation. Input impedance pin 6 is about 5.5 kΩ±20%. Below are some typical values for R1 and R2, for some different supplies from telephone stations. Battery feed R1 R2 R6 No regulation Set for short line gain. All feedings 22kΩ 47~100Ω Regulation: 48V, 2·200Ω 48V, 2·400Ω 36V, 2·500Ω ∞ ∞ ∞ ∞ 180kΩ 47Ω 75Ω 100Ω Impedance to line (R3, C1, C2): C1 in series with R3 and those in parallel with C2 give the impedance to the line from the set. C2 must normally be there for the interference too. The network is optimized with regard to the return loss. The time constant R3, C1 cannot be allowed to be too small. If the time constant is to small, distortion at low frequencies may be generated. If R3 is changed this will change the DC-characteristic too, which set by the voltage at pin 4. The input current at pin 4 is about 1mA Microphone selection (M1, R16): The microphone can be either dynamic, magnetic or electrets. See fig. 12, 14 and 15. The input impedance between pin 12 and 13 is about 1.7kΩ with typical variation ±20% Transmitting gain and frequency response (R4, R5, C3, C4): The network gives the amplification and frequency response for the transmitter. R5 is used when a greater reduction of the gain is wanted. Input impedance at pin 3 is about 17 kΩ with typical variation ±20%.The sum of the resistors R4 and R5 must not be less than 35 kΩ because of DC-current to ground. Below is some simple variations of this network. (See fig. 7). DC-characteristics (R6): Sets the DC-characteristic and take care of some of the supplied power. The resistor have also function with the protection of the circuit, the transmitter, the gain regulation and side tone. Common values are 47 Ω to 100 Ω. Side tone level, receiving gain and frequency response.(R7,R8,R9,R10,R11,C5): The network sets the side tone balance. The network in the application is one of many possibilities. R10 and R11 balance together the signals that go two different ways from the transmitter output stage one from pin1 and the other from pin2. The balance network consist of R8, R9 and C5. The example is not optimized to any specified line, it is only given to show the principle. Fig8, 9 and 10 are examples of balance networks. Fig.10 is especially suited for lines with high current supply. R12, R13, C6, (R10, R11): The networks gives the gain and frequency response for the receiver. Input impedance at pin 15 is about 38 kΩ with a typical variation of ±20%.For different possibilities for the design of the network, see the network for the transmitter (R4, R5, C3) REC, R14: R14 generates the output impedance to the magnetic earphone (fig.11). If a dynamic earphone is used it should be placed between pin 17 and 18.See fig. 16. |
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