參數資料
型號： AD9551/PCBZ
廠商： Analog Devices Inc
文件頁數： 31/40頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD9951
設計資源： AD9551 Schematic
AD9551 BOM
AD9551 Layout
標準包裝： 1
主要目的： 計時，時鐘發(fā)生器
嵌入式： 否
已用 IC / 零件： AD9551
主要屬性： 2 輸入，2 輸出，VCO
次要屬性： 圖形用戶界面，USB 接口
已供物品： 板
AD9551
Rev. B | Page 37 of 40
REFB Frequency Control (Register 0x26 to Register 0x2D)
Table 30.
Address
Bit
Bit Name
Description
0x26
7
Enable SPI control of
REFB SDM
Controls REFB frequency division functionality.
0 = REFB frequency division defined by the B[3:0] pins (default).
1 = contents of Register 0x27 to Register 0x2D define REFB frequency division via NB,
MODB, and FRACB.
6
Bypass REFB SDM
Controls bypassing of the REFB SDM.
0 = allow integer-plus-fractional division (default).
1 = allow integer division only.
5
Enable REFB SDM
Controls REFB SDM enable and hold functionality.
0 = reset REFB SDM and stop its clocks.
1 = REFB SDM enabled (default).
4
Enable REFA
Controls REFA enable and power-down functionality.
0 = power down REFA input receiver (ineffective unless Register 0x1A[1] = 1).
1 = normal operation (default).
[3:0]
Unused
Unused.
0x27
[7:0]
FRACB
Bits[19:12] of the 20-bit fractional part of the REFB SDM.
0x28
[7:0]
FRACB
Bits[11:4] of the 20-bit fractional part of the REFB SDM.
0x29
[7:4]
FRACB
Bits[3:0] of the 20-bit fractional part of the REFB SDM.
Default is FRACB = 0100 0000 0000 0000 0000 (262,144).
Note that FRACB assumes twos complement format.
[3:0]
Unused
Unused.
0x2A
[7:2]
NB
6-bit integer divide value for the REFB SDM. Default divide value is 8.
[1:0]
Unused
Unused.
0x2B
7
Unused
This bit must be programmed to 0, even though the default value is 1.
[6:0]
MODB
Bits[18:12] of the 19-bit modulus of the REFB SDM.
0x2C
[7:0]
MODB
Bits[11:4] of the 19-bit modulus of the REFB SDM.
0x2D
[7:4]
MODB
Bits[3:0] of the 19-bit modulus of the REFB SDM.
Default is MODB = 000 0000 0000 0000 0000.
[3:0]
Unused
Unused.
REFA Delay Control (Register 0x2E and Register 0x2F)
Table 31.
Address
Bit
Bit Name
Description
0x2E
7
Enable SPI control of REFA
delay
Controls REFA delay functionality.
0 = the device automatically selects REFA delay (default).
1 = REFA delay defined by Register 0x2E[6:0] and Register 0x2F[7:6].
[6:0]
REFA delay control
Bits[8:2] of the 9-bit REFA delay word.
0x2F
[7:6]
REFA delay control
Bits[1:0] of the 9-bit REFA delay word.
Default is 1 0000 0000. Delay granularity is ~150 ps.
[5:0]
Unused
Unused.
REFB Delay Control (Register 0x30 and Register 0x31)
Table 32.
Address
Bit
Bit Name
Description
0x30
7
Enable SPI control of REFB
delay
Controls REFB delay functionality:
0 = the device automatically selects REFB delay (default).
1 = REFB delay defined by Register 0x30[6:0] and Register 0x31[7:6].
[6:0]
REFB delay control
Bits[8:2] of the 9-bit REFB delay word.
0x31
[7:6]
REFB delay control
Bits[1:0] of the 9-bit REFB delay word.
Default is 1 0000 0000. Delay granularity is ~150 ps.
[5:0]
Unused
Unused.
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