欢迎访问ic37.com |
会员登录 免费注册
发布采购

L8576B 参数 Datasheet PDF下载

L8576B图片预览
型号: L8576B
PDF下载: 下载PDF文件 查看货源
内容描述: 双振铃SLIC [Dual Ringing SLIC]
分类和应用:
文件页数/大小: 26 页 / 564 K
品牌: AGERE [ AGERE SYSTEMS ]
 浏览型号L8576B的Datasheet PDF文件第2页浏览型号L8576B的Datasheet PDF文件第3页浏览型号L8576B的Datasheet PDF文件第4页浏览型号L8576B的Datasheet PDF文件第5页浏览型号L8576B的Datasheet PDF文件第7页浏览型号L8576B的Datasheet PDF文件第8页浏览型号L8576B的Datasheet PDF文件第9页浏览型号L8576B的Datasheet PDF文件第10页  
Data Sheet  
May 2001  
L8576B Dual Ringing SLIC  
Pin Information (continued)  
Table 1. Pin Descriptions (continued)  
Pin,  
Pin,  
Circuit Circuit Symbol Type  
Name/Function  
a
b
40  
6
RNGNG  
NSTAT  
Iu  
Ringing Input. Refer to Operating States section. A pull-up device is  
included.  
39  
7
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  
37  
8
9
NDISC  
RPWR  
Iu  
Disconnect Input. Refer to Operating States section. A pull-up device is  
included.  
Power Resistor. Connect a resistor between this pin and VBAT. A 2.2 k, 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  
35  
10  
11  
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 overvolt-  
age protection resistor.  
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  
33  
32  
31  
30  
29  
28  
27  
26  
12  
13  
14  
15  
16  
17  
18  
19  
20  
VITR  
TG2  
O
O
I
Transmit ac Output Voltage. This output is a voltage that is directly propor-  
tional to the differential tip/ring current.  
Transmit Gain 2. Transmit gain and current limiting for ringing is set by the  
value of RGX2. RGX2 is connected between TG2 and VITR.  
TG1  
Transmit Gain 1. Transmit gain is set by the series resistor combination of  
RGX1 and RGX2 from this lead to TG2.  
RTFLT  
RTTH  
DCOUT  
IPROG  
RCVP  
RCVN  
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.  
Ring Trip Threshold. Connect this lead to DCOUT via a resistor to set the ring  
trip threshold.  
dc Voltage Out. This output is a voltage that is directly proportional to the  
absolute value of the differential tip/ring current.  
Current-Limit Program Input. A resistor to DCOUT sets the dc current limit of  
the circuit.  
I
Receive Signal Input (+). This high-impedance input controls the ac differen-  
tial voltage on tip/ring.  
I
Receive Signal Input (–). This high-impedance input controls the ac differen-  
tial voltage on tip/ring.  
25  
24  
23  
21  
22  
23  
AGND  
VCC  
Analog Signal Ground.  
Analog 5 V Power Supply.  
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.  
* 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.  
u
u
Note: I and O indicate a pull-up device is included on this lead.  
6
Agere Systems Inc.