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HC9P5504B-5Z Datasheet(PDF) 6 Page - Intersil Corporation |
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HC9P5504B-5Z Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 9 page 6 Functional Diagram 21 RX Receive Input, 4-Wire Side - A high impedance analog input which is internally biased. Capacitive coupling to this input is required. AC signals appearing at this input differentially drive the Tip feed and Ring feed terminals, which in turn drive tip and ring through 300 Ω of feed resistance on each side of the line. 22 C4 Capacitor #4 - An external capacitor to be connected between this terminal and analog ground. This capacitor prevents false ground key indication and false ring trip detection from occurring when longitudinal currents are induced onto the subscriber loop from near by power lines and other noise sources. This capacitor 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. 23 AG (Note 5) Analog Ground - To be connected to zero potential and serves as a reference for the transmit output (TX) and receive input (RX) terminals. 24 TX Transmit Output, 4-Wire Side - A low impedance analog output which represents the differential voltage 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 unbalanced and referenced to analog ground. Since the DC level of this output varies with loop current, capacitive coupling to the next stage is essential. NC No internal connection. Pin Descriptions (Continued) 24 PIN SOIC SYMBOL DESCRIPTION LOOP MONITORING RING CONTROL 2 WIRE LOOP SECONDARY PROTECTION LINE DRIVERS TIP RING VB- VB- PD POWER DENIAL 150 Ω RING 150 Ω RF BG 150 Ω TF TIP RD RC RS RING SYNC RING COMMAND RING TRIP SHD GKD OUT RX RECEIVE INPUT SLIC MICROCIRCUIT 1/2 RING RELAY VB- RING VOLTAGE RFS 1/2 RING RELAY 150 Ω SWITCH HOOK DETECTION GROUND KEY DETECTION BATTERY FEED LOOP CURRENT LIMITER DIFF AMP TX TRANSMIT OUTPUT + - +1 -1 OP AMP +IN -IN + - HC-5504B |
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Similar Description - HC9P5504B-5Z |
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