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MT91600AN1 Datasheet(PDF) 4 Page - Zarlink Semiconductor Inc |
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MT91600AN1 Datasheet(HTML) 4 Page - Zarlink Semiconductor Inc |
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4 / 18 page  MT91600 Data Sheet 4 Zarlink Semiconductor Inc. Impedance Programming The MT91600 allows the designer to set the device’s impedance across TIP and RING, (ZTR), and network balance impedance, (ZNB), separately with external low cost components. For a resistive load, the impedance (ZTR) is set by R11 and R18. For a complex load, the impedance (ZTR) is set by R11, R18, R19 & C8 (see Figure 5.) The network balance, (ZNB), is set by R16, R17 & C3 (see Figure 5.) The network balance impedance should be calculated once the 2W - 4W gain has been set. Line Impedance For optimum performance, the characteristic impedance of the line, (Zo), and the device’s impedance across TIP and RING, (ZTR), should match. Therefore: Zo = ZTR The relationship between Zo and the components that set ZTR is given by the formula: Zo / ( R1+R2) = kZo / R11 where kZo = ZLZ ZLZ = R18, for a resistive load. ZLZ = [R18 + (R19 // C8)], for a complex load. The value of k can be set by the designer to be any value between 20 and 250. Three rules to ensure the correct operation of the circuit: (A) R18 + R19 > 50k Ω (B) R1 = R2. (C) R11 > =50k Ω It is advisable to place these components as close as possible to the SLIC. Network Balance Impedance The network balance impedance, (ZNB), will set the transhybrid loss performance for the circuit. The balance of the circuit is independent of the 4 - 2 Wire gain but is a function of the 2 - 4 Wire gain. The method of setting the values for R16 and R17 is given by the formula: R17 = [1.782 * Zo / ( Zo+ZNB) * ( R13 / R12 )] R17 + R16 [1 + R13 / R12] where ZNB is the network balance impedance of the SLIC and Zo is the line impedance. (R16 + R17) >= 50k Ω It is advisable to place these components as close as possible to the SLIC. |
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