参数资料
型号: AD9553/PCBZ
厂商: Analog Devices Inc
文件页数: 33/44页
文件大小: 0K
描述: BOARD EVAL FOR AD9553
设计资源: AD9553 Eval Brd BOM
AD9553 Eval Brd Schematic
标准包装: 1
主要目的: 计时,时钟缓冲器 / 驱动器 / 接收器 / 变换器
已用 IC / 零件: AD9553
已供物品:
相关产品: AD9553BCPZ-ND - IC INTEGER-N CLCK GEN 32LFCSP
AD9553BCPZ-REEL7-ND - IC INTEGER-N CLCK GEN 32LFCSP
AD9553
Rev. A | Page 39 of 44
REFB Frequency Control (Register 0x23 to Register 0x26)
Table 35.
Address
Bit
Bit Name
Description
0x23
[7:0]
REFB divider (R
B)
Bits[13:6] of the 14-bit REFB divider.
0x24
[7:2]
REFB divider (R
B)
Bits[5:0] of the 14-bit REFB divider (default: R
B = 8192 decimal). The REFB divider bits
are ineffective unless Register 0x24[1] = 1.
1
Enable SPI control of R
B
Enables SPI port control of the REFB divider value (R
B).
0 = the A3 to A0 pins define R
B per Table 14 (default).
1 = the 14-bit value in the REFB divider register defines R
B.
0
Unused
Unused.
0x25
7
Enable SPI control of ×2
B
Enables SPI control of the REFB ×2 frequency multiplier (×2
B) per Register 0x25[6].
0 = the device automatically selects ×2
B per Table 14 (default).
1 = Register 0x25[6] controls the selection of ×2
B.
6
Select ×2
B
Selects ×2
B. This bit is ineffective unless Register 0x25[7] = 1.
0 = bypass ×2
B (default).
1 = select ×2
B.
5
Enable SPI control of ÷5
B
Enables SPI control of the ÷5
B prescaler per Register 0x25[4].
0 = the device automatically selects ÷5
B per Table 14 (default).
1 = Register 0x25[4] controls the selection of ÷5
B.
4
Select ÷5
B
Selects ÷5
B. This bit is ineffective unless Register 0x25[5] = 1.
0 = bypass ÷5
B (default).
1 = select ÷5
B.
[3:0]
Unused
Unused.
0x26
[7:0]
Unused
Unused.
DCXO Frequency and Reference Switchover Control (Register 0x27 to Register 0x31)
Table 36.
Address
Bit
Bit Name
Description
0x27
[7:0]
XO divider (R
XO)
Bits[13:6] of the 14-bit XO divider.
0x28
[7:2]
XO divider (R
XO)
Bits[5:0] of the 14-bit XO divider (default: R
XO = 4096 decimal). The XO divider bits are
ineffective unless Register 0x28[1] = 1.
1
Enable SPI control of R
XO
Enables SPI port control of the XO divider value (R
XO).
0 = the A3 to A0 pins define R
XO per Table 14 (default).
1 = the 14-bit value in the XO divider register defines R
XO.
0
Unused
Unused.
0x29
[7:6]
Switchover mode
Selects the switchover operating mode.
00 = revertive switchover (default).
01 = nonrevertive switchover.
10 = selects REFA as the active reference.
11 = selects REFB as the active reference.
5
REFA diff
Enables the differential input reference function.
0 = normal single-ended operation of REFA and REFB (default).
1 = REFA configured as a differential reference in which the REFA pin functions as one
differential input and the REFB/REFA pin functions as the other differential input. In this
configuration, the REFB channel and switchover functionality are both unavailable.
[4:0]
Unused
Unused.
0x2A to
0x31
[7:0]
Unused
Unused.
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