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HC4P5502B1-5 Datasheet(PDF) 6 Page - Intersil Corporation |
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HC4P5502B1-5 Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 12 page 4-6 Functional Diagram 26 22 C4 Capacitor #4 - An external capacitor to be connected between this terminal and analog ground. This ca- pacitor prevents false ground key indication and false ring trip detection from occurring when longitudinal currents are induced onto the subscriber loop from nearby power lines and other noise sources. This ca- pacitor is also required for the proper operation of ring trip detection. Typical value is 0.5 µF to 1.0µF, 20V. This capacitor should be nonpolarized. 27 23 AG Analog Ground - To be connected to zero potential and serves as a reference for the transmit output (TX) and receive input (RX) terminals. 28 24 TX Transmit Output, Four Wire Side - A low impedance analog output which represents the differential volt- age across Tip and Ring. Transhybrid balancing must be performed (using the SLIC microcircuit’s spare op amp) beyond this output to completely implement two to four wire conversion. This output is unbal- anced and referenced to analog ground. Since the DC level of this output varies with loop current, capac- itive coupling to the next stage is essential. 1, 8, 5, 22 NC No Internal Connection. NOTE: 5. All grounds (AG, BG, and DG) must be applied before VB+orVB-. Failure to do so may result in premature failure of the part. If a user wishes to run separate grounds off a line card, the AG must be applied first. Pin Descriptions (Continued) 28 PIN PLCC 24 PIN DIP/SOIC SYMBOL DESCRIPTION RING RELAY LOOP CURRENT LIMITER BATTERY FEED + DIFF AMP + OP AMP LOOP MONITORING RING CONTROL 2-WIRE LOOP SECONDARY PROTECTION +1 -1 LINE DRIVERS TIP RING VB- VB- PD POWER DENIAL 150 Ω RING 150 Ω RF BG 150 Ω TF TIP RD RC RS RING VOLTAGE RING SYNC RING COMMAND RING TRIP SHD GKD TX TRANSMIT OUTPUT OUT +IN -IN RX RECEIVE INPUT SLIC MICROCIRCUIT 150 Ω SWITCH HOOK DETECTION GROUND KEY DETECTION HC-5502B1 |
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Similar Description - HC4P5502B1-5 |
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