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HC5526 Datasheet(PDF) 9 Page - Intersil Corporation |
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HC5526 Datasheet(HTML) 9 Page - Intersil Corporation |
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9 / 20 page  9 Circuit Operation and Design Information The HC5526 is a current feed voltage sense Subscriber Line Interface Circuit (SLIC). This means that for short loop applications the SLIC provides a programmed constant current to the tip and ring terminals while sensing the tip to ring voltage. The following discussion separates the SLIC’s operation into its DC and AC paths, then follows up with additional circuit and design information. Constant Loop Current (DC) Path SLIC in the Active Mode The DC path establishes a constant loop current that flows out of tip and into the ring terminal. The loop current is programmed by resistors RDC1, RDC2 and the voltage on the RDC pin (Figure 13). The RDC voltage is determined by the voltage across R1 in the saturation guard circuit. Under constant current feed conditions, the voltage drop across R1 sets the RDC voltage to -2.5V. This occurs when current flows through R1 into the current source I2. The RDC voltage establishes a current (IRSN) that is equal to VRDC/(RDC1 +RDC2). This current is then multiplied by 1000, in the loop current circuit, to become the tip and ring loop currents. For the purpose of the following discussion, the saturation guard voltage is defined as the maximum tip to ring voltage at which the SLIC can provide a constant current for a given battery and overhead voltage. SUPPLY CURRENTS (VBAT = -28V) ICC, On-Hook Open Circuit State (C1, 2 = 0, 0) - - 1.5 mA Standby State (C1, 2 = 1, 1) - - 1.7 mA Active State (C1, 2 = 0,1) - - 5.5 mA IEE, On-Hook Open Circuit State (C1, 2 = 0, 0) - - 0.8 mA Standby State (C1, 2 = 1, 1) - - 0.8 mA Active State (C1, 2 = 0, 1) - - 2.2 mA IBAT, On-Hook Open Circuit State (C1, 2 = 0, 0) - - 0.4 mA Standby State (C1, 2 = 1, 1) - - 0.6 mA Active State (C1, 2 = 0, 1) - - 3.9 mA PSRR VCC to 2 or 4-Wire Port (Note 30, Figure 12) - 40 - dB VEE to 2 or 4-Wire Port (Note 30, Figure 12) - 40 - dB VBAT to 2 or 4-Wire Port (Note 30, Figure 12) - 40 - dB FIGURE 12. POWER SUPPLY REJECTION RATIO Electrical Specifications TA = 0 oC to 70oC, V CC = 5V ±5%, VEE = -5V ±5%, VBAT = -28V, AGND = BGND = 0V, RDC1 = RDC2 = 41.2kΩ, RD = 39kΩ, RSG = ∞, RF1 = RF2 = 0Ω, CHP = 10nF, CDC = 1.5µF, ZL = 600Ω. (Continued) PARAMETER CONDITIONS MIN TYP MAX UNITS RT RRX 600k Ω 300k Ω RL VTX 600 Ω 100mVRMS, 50Hz TO 4kHz -48V SUPPLY 5V SUPPLY -5V SUPPLY PSRR = 20 log (VTX/VIN) TIP 27 VTX 19 RING 28 RSN 16 HC5526 |
Similar Part No. - HC5526_03 |
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Similar Description - HC5526_03 |
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