參數(shù)資料
型號: ICS674R-01T
英文描述: User Configurable Divider
中文描述: 用戶可配置的分頻器
文件頁數(shù): 3/6頁
文件大?。?/td> 51K
代理商: ICS674R-01T
ICS674-01
User Configurable Divider
MDS 674-01 A
Integrated Circuit Systems 525 Race Street San Jose CA 95126 (408)295-9800tel(408)295-9818fax
3
Revision 033199
Printed 11/15/00
PRELIMINARY INFORMATION
Determining (setting) the divider
The user has full control in setting the desired divide. The user should connect the appropriate divider select
input pins directly to ground (or VDD, although this is not required because of internal pull-ups) during
Printed Circuit Board layout, so that the ICS674-01 automatically produces the correct divide when all
components are soldered. It is also possible to connect the inputs to parallel I/O ports in order to change
divides.
The divides of the ICS674-01 can be determined by the following simple equations:
Divide A = DAW+2
Where
Divider A Word (DAW) = 1 to 127 (0 is not permitted).
Divide B = (DBW+8)PD
Where
Divider B Word (DBW) = 4 to 511 (0,1,2,3, are not permitted).
Post Divider (PD) = values on Page 2
For example, suppose Divide A is desired to be 61 and Divide B is desired to be 284, then
DAW = 59, DBW = 276 and PD = 1. This means A6:A0 is 0111011, B8:B0 is
100010100 and S2:S0 is 110. Since all inputs have pull-ups, it is only necessary to ground
the zero pins, namely A6, A2, B7, B6, B5, B3, B1, B0 and S0.
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PDF描述
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