參數(shù)資料
型號: ADN4605ABPZ
廠商: Analog Devices Inc
文件頁數(shù): 26/56頁
文件大小: 0K
描述: IC CROSSPOINT SWITCH 352BGA
標(biāo)準包裝: 1
系列: XStream™
功能: 交叉點開關(guān)
電路: 1 x 40:40
電壓電源: 單電源
電壓 - 電源,單路/雙路(±): 2.25 V ~ 3.6 V
電流 - 電源: 55mA
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 352-LBGA 裸露焊盤
供應(yīng)商設(shè)備封裝: 352-BGA-EP(35x35)
包裝: 托盤
ADN4605
Data Sheet
Rev. A | Page 32 of 56
TERMINATION
The inputs and outputs include integrated 50 Ω termination
resistors. The internal resistors can be disabled for applications that
require external termination resistors. For example, disabling the
integrated 50 Ω termination resistors allow alternative termination
values such as 75 Ω as shown in Figure 45.
Note that the integrated 50 Ω termination resistors are optimal
for high data rate digital signaling. Disabling the terminations
can reduce the overall performance.
The termination control for the receiver inputs can be accessed
through Register Address 0xD0 (Input 0 to Input 19) and
Register Address 0xD1 (Input 20 to Input 39). The termination
control for the transmitter outputs can be accessed through
Register Address 0xBC (Output 0 to Output 19) and Register
Address 0x BD (Output 20 to Output 39).
Table 16 shows the termination control registers. Each bit
controls the terminations settings for four inputs/outputs.
A Logic 0 enables the terminations for the respective group.
A Logic 1 disables the terminations for the respective group.
The terminations are enabled by default.
CML
VEE
VTTOx
VCC
VTTIx
ADN4605
Rx
50
75
50
VTTIx
75
50
09796-
012
Figure 45. 75 Ω to 50 Ω Impedance Translator
Table 16. Termination Control Register
Register
Address
Default
Register Name
Bit
Bit Name
Description
Functionality
0xBD
0x00
Tx Termination Control
4
3
2
1
0
TXB_TERM
Output [39:36] (B side) termination control
Output [35:32] (B side) termination control
Output [31:28] (B side) termination control
Output [27:24] (B side) termination control
Output [23:20] (B side) termination control
0 = terminations enabled
1= terminations disabled
0xBC
0x00
Tx Termination Control
4
3
2
1
0
TXA_TERM
Output [19:16] (A side) termination control
Output [15:12] (A side) termination control
Output [11:8] (A side) termination control
Output [7:4] (A side) termination control
Output [3:0] (A side) termination control
0xD1
0x00
Rx Termination Control
4
3
2
1
0
RXB_TERM
Input [39:36] (B side) termination control
Input [35:32] (B side) termination control
Input [31:28] (B side) termination control
Input [27:24] (B side) termination control
Input [23:20] (B side) termination control
0xD0
0x00
Rx Termination Control
4
3
2
1
0
RXA_TERM
Input [19:16] (A side) termination control
Input [15:12] (A side) termination control
Input [11:8] (A side) termination control
Input [7:4] (A side) termination control
Input [3:0] (A side) termination control
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