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L3000N bảng dữ liệu(PDF) 11 Page - STMicroelectronics

tên linh kiện L3000N
Giải thích chi tiết về linh kiện  SLIC KIT OPTIMIZED FOR APPLICATIONS WITH BOTH FIRST AND SECOND GENERATION COMBOS
PDF  32 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L3000N bảng dữ liệu(HTML) 11 Page - STMicroelectronics

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If, for example, the loop resistance is 400
Ω the
GDK output will be 0 only when the limiting current
value is 40 or 25mA.
The card controller can program consecutive Test
Mode and Conversation Mode with different limiting
current in order to individuate the range of loop re-
sistance as shown in the flow chart of fig. 6.
The information of the Loop Resistance Range
can be very useful to optimize the transmission
characteristics of the Line Card to each line.
For example, if a second generation COMBO like
TS5070 is used the Card Controller can use this
information to change the Tx, RX Gains and echo
cancellation characteristics into the programma-
ble COMBO improving the quality of the system.
Limiting Current
GDK = 0
GDK = 1
60mA
40mA
25mA
(0 – 300) ohm
(0 – 650) ohm
(0 – 1300) ohm
>300 ohm
>650 ohm
>1300 ohm
Figure 6: Procedure for Loop Resistance Evaluation.
L3000N - L3092
11/32



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