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XRT5794IJ-F

更新时间: 2024-11-11 13:16:11
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艾科嘉 - EXAR /
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XRT5794IJ-F 数据手册

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XRT5794ES  
Evaluation  
System  
GENERAL DESCRIPTION  
balanced 120operation are one quarter inch, 3-circuit  
audio type jacks. Equipmentconnections should be made  
with shielded twisted pair patch cords. The signal applied  
to any inputs must be a CCITT G.703 compliant pulse that  
may be attenuated by a twisted-paircable. The XR-T5794  
exceeds G.703 maximum cable loss of requirement of 6.0  
dB at 1.024 MHz.  
The XR-T5794 demo board is  
a 4.75” x 9.75”  
double-sided circuit card that provides the support  
circuitry necessary for a comprhensive evaluation of the  
XR-T5794 CMOS Quad E1 Line Interface IC. three  
board-mounted DIP switches allow complete testing of all  
loop back, monitor, and transmitter power-down features.  
The demo board is normally supplied configured for 120Ω  
balanced E1 operation. However, the information  
contianed in this manual enables the user to modify the  
hardware for E1 unbalanced 75cable service, or T1  
balanced 100use.  
Similarly, transmitter outputs are labeleds TXOUT1  
through TXOUT4 for the four channels. The monitor  
channel output is labeled MONOUT. Connector types  
and connection methods are identical to those specified  
above for the recieve side. The transmitter output, when  
terminated by a 120resistor, is a pulse meeting the  
G.703 template requirements. During demo board  
evaluation, all ransmitters, including the monitor channel,  
that are not powered down should be connected to either  
a properly terminated cable, a piece of test equipment  
contianing a termination, or a 120load resistor.  
BOARD OPERATION  
Figures 1, 2 and Table 2 are the board component layout,  
circuit diagram, and parts list respectively. The Demo  
Board uses the same pin function and signal names as  
the XR-T5794 data sheet. This user’s manual is designed  
to be used in conjuction with the XR-T5794 data sheet.  
The following description if for a demo board set up for  
balanced 120 E1 use. It also applies to the other modes  
of operation if the appropriate impedence, cable type, and  
signal source changes are made.  
Equipment-Side Signal Connections  
For  
convenience, access  
to  
the  
logic-level  
equipment-side signals is provided by two groups of turret  
terminals and also by two ribbon cable connectors. The  
terminals are convient for simple tests while the ribbon  
cable connectors reduce the amount of wiring necessary  
to connect the entire equipment side of the demo board to  
customer equipment.  
Power Requirements  
Power connections are made to banana jacks located in  
the upper left hand corner of the board. Power supply  
requirements are:  
Header P1 and a group of terminals that provide channel  
1 and 2 I/O are located below the XR-T5794. For  
channels 3 and 4, P2 and a second group of pins are  
located above the XR-T5794. P1 and P2 are dual-row 26  
pin headers with only the odd-nimbered pins used to carry  
signals. Even-numbered pins are grounded to minimize  
ribbon cable crosstalk. Pin 13 is also grounded to provide  
isolation between the transmit and receive directions.  
V
DD  
V
SS  
= +5.0 V 5% at 850 mA maximum  
= - 5.0 V 5% at 850 mA minimum  
Line-Side Signals  
Receiver signal inputs are labeled RXIN1 through RXIN4  
for the four channels. The connectors supplied for  
Rev. 2.00  
5

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