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ISL5585BIM Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL5585BIM Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 22 page 10 The gain of the Transmit Amplifier, set by RS , determines the programmed impedance of the device. The capacitor CFB blocks the DC component of the loop current. The ground symbols in the model represent AC grounds, not actual DC potentials. The Sense Amplifier is configured as a 4 input differential amplifier with a gain of 3/4. The voltage at the output of the sense amplifier (VSA) is calculated using superposition. VSA1 is the voltage resulting from V1, VSA2 is the voltage resulting from V2 and so on (reference Figure 4). Where ∆V is equal to I MRSENSE (RSENSE = 20Ω) The voltage at VTX is equal to: VTR is defined in Figure 4, note polarity assigned to VTR: Setting VIN equal to zero in EQ 18, defining ZO = -VTR/∆IM and substituting it into EQ18 will enable the user to determine the required feedback to match the line impedance at V2W as shown in Equation 19. 2-Wire Impedance Matching ZO is the source impedance of the device and is defined as. ZL is the line impedance and RP is the external protection resistor. RS is defined as: V SA1 3 4 --- V 1 () – = (EQ. 11) V SA2 3 4 --- V 2 () = (EQ. 12) V SA3 3 4 --- V 3 () – = (EQ. 13) V SA4 3 4 --- V 4 () = (EQ. 14) V SA V 2 V 1 – () V 4 V 3 – () + []3 4 --- V ∆ V ∆ + []3 4 --- == (EQ. 15) V SA 2I M ∆ 20 × ()3 4 --- I M30 ∆ == (EQ. 16) V TX V IN R S R IN ---------- – V SA – R S 8k -------- V IN R S R IN ---------- – I M 30 ∆ () – R S 8k -------- == (EQ. 17) V TR 2V TX () 2V IN R S R IN ---------- I M30 ∆ () R S 8k -------- + == (EQ. 18) Z O 1 133.33 ------------------R S = (EQ. 19) Z O Z L 2R P – = (EQ. 20) R S 133.33 Z L 2R P – () = (EQ. 21) FIGURE 4. AC SIGNAL TRANSMISSION MODEL AUX TIP RING EG VTR IM VTX RP RP + - + - - + IM ZL + - R + - R RSENSE VSA = ∆IM30 IX IX + - IX + - + - + - IM - 20 Ω 20 Ω V2W + - INTERSIL ISL5585 VTX Z0 1:1 + - CFB VFB -IN TA R R RS 8k 3R 3R 4R 4R 4R 4R IX SENSE FEEDBACK RECEIVE BLOCK V1 V2 V3 V4 IM + - IM + - RSENSE AMPLIFIER FEED AMPLIFIER FEED VIN FROM CODEC RIN AMPLIFIER AMPLIFIER ISL5585 |
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