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HC5515CM Datasheet(PDF) 9 Page - Intersil Corporation |
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HC5515CM Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 17 page 63 on tip and -4V on ring, for a total of -8V margin, is recommended as a general guideline. The value of RSG is calculated using Equation 6: where: VBAT = Battery voltage, and VMAR = Voltage Margin. Recommended value of -8V to allow a maximum overload level of 3.1VPEAK. For on-hook transmission RL = ∞, Equation 6 reduces to: SLIC in the Standby Mode Overall system power is saved by configuring the SLIC in the standby state when not in use. In the standby state the tip and ring amplifiers are disabled and internal resistors are connected between tip to ground and ring to VBAT. This connection enables a loop current to flow when the phone goes off-hook. The loop current detector then detects this current and the SLIC is configured in the active mode for voice transmission. The loop current in standby state is calculated as follows: where: IL = Loop current in the standby state, RL = Loop resistance, and VBAT = Battery voltage. (AC) Transmission Path SLIC in the Active Mode Figure 15 shows a simplified AC transmission model. Circuit analysis yields the following design equations: where: VTR = Is the AC metallic voltage between tip and ring, including the voltage drop across the fuse resistors RF, VTX = Is the AC metallic voltage. Either at the ground referenced 4-wire side or the SLIC tip and ring terminals, IM = Is the AC metallic current, RF = Is a fuse resistor, ZT = Is used to set the SLIC’s 2-wire impedance, VRX = Is the analog ground referenced receive signal, ZRX = Is used to set the 4-wire to 2-wire gain, EG = Is the AC open circuit voltage, and ZL = Is the line impedance. (AC) 2-Wire Impedance The AC 2-wire impedance (ZTR) is the impedance looking into the SLIC, including the fuse resistors, and is calculated as follows: Let VRX = 0. Then from Equation 10: ZTR is defined as: Substituting in Equation 9 for VTR: Substituting in Equation 12 for VTX: Therefore: Equation 16 can now be used to match the SLIC’s impedance to any known line impedance (ZTR). Example: Calculate ZT to make ZTR = 600Ω in series with 2.16µF. RF =20Ω. ZT = 560kΩ in series with 2.16nF. (AC) 2-Wire to 4-Wire Gain The 2-wire to 4-wire gain is equal to VTX/ VTR. From Equations 9 and 10 with VRX = 0: (AC) 4-Wire to 2-Wire Gain The 4-wire to 2-wire gain is equal to VTR/VRX. From Equations 9, 10 and 11 with EG = 0: R SG 510 5 • V BAT V MAR – () 1 R DC1 R DC2 + () 600R L ---------------------------------------------- + 16.66V – × ---------------------------------------------------------------------------------------------------------------------------------------------- 17300 – = (EQ. 6) R SG 510 5 • V BAT V MAR 16.66V – – ------------------------------------------------------------------ 17300 – = (EQ. 7) I L V BAT 3V – R L 1800 Ω + -------------------------------- ≈ (EQ. 8) V TR V TX I M 2R F • + = (EQ. 9) V TX Z T ----------- V RX Z RX ----------- + I M 1000 ------------- = (EQ. 10) V TR E G I M Z L • – = (EQ. 11) V TX Z T I M 1000 ------------- • = (EQ. 12) Z TR V TR I M ----------- = (EQ. 13) Z TR V TX I M ----------- 2R F I M • I M ----------------------- + = (EQ. 14) Z TR Z T 1000 ------------- 2R F + = (EQ. 15) Z T 1000 Z TR 2R F – () • = (EQ. 16) Z T 1000 600 1 j ω 2.16 • 10 6 – • ----------------------------------------- 220 • – + • = A 24 – V TX V TR ----------- Z T 1000 ⁄ Z T 1000 ⁄ 2R F + ------------------------------------------ == (EQ. 17) A 42 – V TR V RX ----------- Z T Z RX ----------- – Z L Z T 1000 ------------- 2R F Z L ++ -------------------------------------------- • == (EQ. 18) HC5515 |
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