L8575 查看數據表（PDF） - Agere -> LSI Corporation

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L8575

Dual-Resistive, Low-Cost Subscriber Line Interface Circuit (SLIC)

Agere -> LSI Corporation 

L8575

Dual-Resistive, Low-Cost SLIC

Advance Data Sheet

March 1997

Preliminary Pin Information (continued)

Table 1. Pin Descriptions (continued)

Pin Symbol Type

11 RTNB I

12 XMTB O

13 TSB I

14 RSB I

15 RGBNB I

16 VRNB I

17 IRPB I

18 PTB O

19 PRB O

20 AGND —

21 VBAT —

22 CBNB I

23 VDDA —

24 CBNA I

25 VBAT —

26 AGND —

27 PRA O

28 PTA O

29 IRPA I

30 VRNA I

Name/Function

Ring-Trip Negative (Channel B). Negative sense input for the ring-trip detector.

Transmit Signal Output (Channel B). Channel B transmit amplifier output.

Tip Sense (Channel B). Negative input of channel B transmit op amp. Connect one high-

value resistor between TSB and the Tip of loop B and another high-value resistor between

TSB and XMTB.

Ring Sense (Channel B). Positive input of channel B transmit op amp. Connect one high-

value resistor between RSB and the Ring of loop B and another high-value resistor between

RSB and AGND.

Battery Noise Gain Resistor (Channel B). The current flowing out of PRB is 50 times the

current flowing into RGBNB. Connect a resistor from RGBNB to AGND to set the gain of the

channel B battery noise cancellation circuit.

Receive Voltage Negative Input (Channel B). The differential current flowing from PTB to

PRB is –200 times the voltage applied to VRNB, divided by the impedance connected

between IRPB and AGND.

Receive Current Positive Input (Channel B). The differential current flowing from PTB to

PRB is 200 times the current flowing into IRPB.

Protected Tip (Channel B). Output of the Tip current drive amplifier B. Connect PTB to the

Tip of loop B through an overvoltage protection resistor (1.4 kΩ minimum).

Protected Ring (Channel B). Output of the Ring current drive amplifier B. Connect PRB to

the Ring of loop B through an overvoltage protection resistor (1.4 kΩ minimum).

Analog Signal Ground. Signal ground for channel B.

Office Battery Supply. Negative office battery supply for channel B.

Battery Noise Capacitor (Channel B). The current flowing out of PRB is –50 times the

voltage applied to CBNB, divided by the impedance connected between RGBNB and

AGND. Couple VBAT to CBNB through a high-pass filter to eliminate battery noise from the

Tip/Ring of channel B.

5 V Analog dc Supply.

Battery Noise Capacitor (Channel A). The current flowing out of PRA is –50 times the

voltage applied to CBNA, divided by the impedance connected between RGBNA and

AGND. Couple VBAT to CBNA through a high-pass filter to eliminate battery noise from the

Tip/Ring of channel A.

Office Battery Supply. Negative office battery supply for channel A.

Analog Signal Ground. Signal ground for channel A.

Protected Ring (Channel A). Output of the Ring current drive amplifier A. Connect PRA to

the Ring of loop A through an overvoltage protection resistor (1.4 kΩ minimum).

Protected Tip (Channel A). Output of the Tip current drive amplifier A. Connect PTA to the

Tip of loop A through an overvoltage protection resistor (1.4 kΩ minimum).

Receive Current Positive Input (Channel A). The differential current flowing from PTA to

PRA is 200 times the current flowing into IRPA.

Receive Voltage Negative Input (Channel A). The differential current flowing from PTA to

PRA is –200 times the voltage applied to VRNA, divided by the impedance connected

between IRPA and AGND.

6

Lucent Technologies Inc.

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