參數(shù)資料
型號： L8575
英文描述： Dual-Resistive,Low-Cost Subscriber Line Interface Circuit(SLIC)
中文描述： 雙電阻，低成本用戶線接口電路（SLIC）
文件頁數(shù)： 6/36頁
文件大?。?/td> 633K
代理商： L8575
L8575
Dual-Resistive, Low-Cost SLIC
Advance Data Sheet
March 1997
6
Lucent Technologies Inc.
Preliminary Pin Information
(continued)
Table 1. Pin Descriptions
(continued)
Pin Symbol Type
11
RTNB
12
XMTB
13
TSB
Name/Function
Negative sense input for the ring-trip detector.
Channel B transmit amplifier output.
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).
PRB is –200 times the voltage applied to VRNB, divided by the impedance connected
between IRPB and AGND.
Receive Current Positive Input (Channel B).
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 k
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 k
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 V
BAT
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 V
BAT
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 k
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 k
Receive Current Positive Input (Channel A).
PRA is 200 times the current flowing into IRPA.
Receive Voltage Negative Input (Channel A).
PRA is –200 times the voltage applied to VRNA, divided by the impedance connected
between IRPA and AGND.
I
Ring-Trip Negative (Channel B).
Transmit Signal Output (Channel B).
Tip Sense (Channel B).
O
I
14
RSB
I
15
RGBNB
I
16
VRNB
I
The differential current flowing from PTB to
17
IRPB
I
The differential current flowing from PTB to
18
PTB
O
minimum).
19
PRB
O
minimum).
20
21
22
AGND
V
BAT
CBNB
—
—
I
23
24
V
CBNA
DDA
—
I
25
26
27
V
BAT
—
—
O
AGND
PRA
minimum).
28
PTA
O
minimum).
29
IRPA
I
The differential current flowing from PTA to
30
VRNA
I
The differential current flowing from PTA to
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