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LUCL8576BP-D Datasheet(PDF) 6 Page - Agere Systems |
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LUCL8576BP-D Datasheet(HTML) 6 Page - Agere Systems |
6 / 26 page 6 Agere Systems Inc. Data Sheet May 2001 L8576B Dual Ringing SLIC Pin Information (continued) Table 1. Pin Descriptions (continued) * On the printed-wiring board (PWB), make the leads to BGND and VBAT as wide as possible for thermal and electrical reasons. Also, maxi- mize the amount of PWB copper on all leads connected to this device for the lowest operating temperature. Note: Iu and Ou indicate a pull-up device is included on this lead. Pin, Circuit a Pin, Circuit b Symbol Type Name/Function 40 6 RNGNG Iu Ringing Input. Refer to Operating States section. A pull-up device is included. 39 7 NSTAT Ou Loop Detector Output/Ring Trip Detector Output. When low, this lead indi- cates an off-hook condition. When in ringing mode, a low output on this lead indicates a ring trip. A pull-up device is included. 38 8 NDISC Iu Disconnect Input. Refer to Operating States section. A pull-up device is included. 37 9 RPWR — Power Resistor. Connect a resistor between this pin and VBAT. A 2.2 k Ω, 2 W resistor should be used for a VBAT of –68.5 V. See the Applications section to calculate resistor values for other VBAT potentials. 36 10 PT I/O Protected Tip. The input to the tip fault protection and output of tip current drive amplifier. Connect this pin to the tip of the loop through a 30 Ω overvolt- age protection resistor. 35 11 PR I/O Protected Ring. The input to the ring fault protection and output of ring cur- rent drive amplifier. Connect this pin to the ring of the loop through a 30 Ω overvoltage protection resistor. 34 12 VITR O Transmit ac Output Voltage. This output is a voltage that is directly propor- tional to the differential tip/ring current. 33 13 TG2 — Transmit Gain 2. Transmit gain and current limiting for ringing is set by the value of RGX2. RGX2 is connected between TG2 and VITR. 32 14 TG1 — Transmit Gain 1. Transmit gain is set by the series resistor combination of RGX1 and RGX2 from this lead to TG2. 31 15 RTFLT — Ring Trip Filter. Connect this lead to RTTH via a resistor and to AGND with a capacitor to filter the ring trip circuit to prevent spurious responses. 30 16 RTTH — Ring Trip Threshold. Connect this lead to DCOUT via a resistor to set the ring trip threshold. 29 17 DCOUT O dc Voltage Out. This output is a voltage that is directly proportional to the absolute value of the differential tip/ring current. 28 18 IPROG I Current-Limit Program Input. A resistor to DCOUT sets the dc current limit of the circuit. 27 19 RCVP I Receive Signal Input (+). This high-impedance input controls the ac differen- tial voltage on tip/ring. 26 20 RCVN I Receive Signal Input (–). This high-impedance input controls the ac differen- tial voltage on tip/ring. 25 21 AGND — Analog Signal Ground. 24 22 VCC — Analog 5 V Power Supply. 23 23 RRNG — Ringing Slope Resistor. Connect this lead to AGND with a resistor to set the slope of the ringing waveform. Note that this pin is shared with both sections. |
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