參數(shù)資料
型號: AD9551BCPZ-REEL7
廠商: Analog Devices Inc
文件頁數(shù): 30/40頁
文件大?。?/td> 0K
描述: IC CLOCK GEN TRANSLATOR 40LFCSP
標準包裝: 1
類型: 時鐘發(fā)生器
PLL:
輸入: 晶體
輸出: CMOS,LVDS,LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 2:2
差分 - 輸入:輸出: 是/是
頻率 - 最大: 900MHz
除法器/乘法器: 無/無
電源電壓: 3.3V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 40-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 40-LFCSP-VQ(6x6)
包裝: 標準包裝
其它名稱: AD9551BCPZ-REEL7DKR
AD9551
Rev. B | Page 36 of 40
REFA Frequency Control (Register 0x1E to Register 0x25)
Table 29.
Address
Bit
Bit Name
Description
0x1E
7
Enable SPI control of
REFA SDM
Controls REFA frequency division functionality.
0 = REFA frequency division, as defined by the A[3:0] pins (default).
1 = contents of Register 0x1F to Register 0x25 define REFA frequency division via NA,
MODA, and FRACA.
6
Bypass REFA SDM
Controls bypassing of the REFA SDM.
0 = allow integer-plus-fractional division (default).
1 = allow only integer division.
5
Enable REFA SDM
Controls REFA SDM enable and hold functionality.
0 = reset REFA SDM and stop its clocks.
1 = REFA SDM enabled (default).
4
Enable REFB
Controls REFB enable and power-down functionality.
0 = power down REFB input receiver (ineffective unless Register 0x1A[1] = 1).
1 = normal operation (default).
3
Unused
Unused.
2
Disable REF SDM PRBS
Controls the PRBS generator for both the REFA and REFB SDMs.
0 = PRBS generator enabled (default).
1 = PRBS generator disabled.
[1:0]
Select 19.44 MHz input
mode divider
Selects the divider value when the 19.44 MHz input mode is in effect.
00 = 1 (default).
01 = 1.
10 = 2.
11 = 4.
These bits are ineffective unless the A[3:0] pins = 1111 or the B[3:0] pins = 1111.
0x1F
[7:0]
FRACA
Bits[19:12] of the 20-bit fractional part of the REFA SDM.
0x20
[7:0]
FRACA
Bits[11:4] of the 20-bit fractional part of the REFA SDM.
0x21
[7:4]
FRACA
Bits[3:0] of the 20-bit fractional part of the REFA SDM.
Default is FRACA = 0100 0000 0000 0000 0000 (262,144).
Note that FRACA assumes twos complement format.
[3:0]
Unused
Unused.
0x22
[7:2]
NA
6-bit integer divide value for the REFA SDM. Default divide value is 16.
[1:0]
Unused
Unused.
0x23
7
Unused
This bit must be programmed to 0, even though the default value is 1.
[6:0]
MODA
Bits[18:12] of the 19-bit modulus of the REFA SDM.
0x24
[7:0]
MODA
Bits[11:4] of the 19-bit modulus of the REFA SDM.
0x25
[7:4]
MODA
Bits[3:0] of the 19-bit modulus of the REFA SDM.
Default is MODA = 000 0000 0000 0000 0000.
[3:0]
Unused
Unused.
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