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AD9530 bảng dữ liệu(PDF) 40 Page - Analog Devices

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Giải thích chi tiết về linh kiện  4 CML Output, Low Jitter Clock Generator
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AD9530 bảng dữ liệu(HTML) 40 Page - Analog Devices

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AD9530
Data Sheet
Rev. 0 | Page 40 of 41
Bits
Bit Name
Settings
Description
Default
Access
0
PFD_ENABLE
PFD enable. This bit enables the phase frequency detector.
1b
RW
0
Disabled.
1
Enabled (default).
LOOP FILTER (REGISTER 0x027)
Table 58. Bit Descriptions for LOOP_FILTER (Default: 0x13)
Bits
Bit Name
Settings
Description
Default
Access
[7:6]
RESERVED
00b
When writing to Register 0x027, these bits must be 00b
00b
W
[5:2]
LOOP_FILTER_CAP
Loop filter capacitance select (CIN in Figure 16)
0x4
RW
0000
5 pF
0001
17.5 pF
0010
30 pF
0011
42.5 pF
0100
55 pF (default)
0101
67.5 pF
0110
80 pF
0111
92.5 pF
1000
105 pF
1001
117.5 pF
1010
130 pF
1011
142.5 pF
1100
155 pF
1101
167.5 pF
1110
180 pF
1111
192.5 pF
1
LOOP_FILTER_BIAS_EN
Loop filter enable bias
1b
RW
0
Disabled
1
Enabled (default)
0
LOOP_FILTER_AMP_EN
Loop filter enable amplifier
1b
RW
0
Disabled
1
Enabled (default)
VCO FREQUENCY (REGISTER 0x028)
Table 59. Bit Descriptions for VCO_READBACK (Default: 0x00)
Bits
Bit Name
Settings
Description
Default
Access
[7:5]
RESERVED
Reserved
000b
R
[4:0]
VCO_FREQ_AUTOCAL
Read only VCO autocalibrated frequency band. This is a diagnostic bit
and the user normally does not need to access this register.
Varies
R
USER SCRATCH PAD 2 (REGISTER 0x0FE)
Table 60. Bit Descriptions for USER_SCRATCHPAD2 (Default: 0x00)
Bits
Bit Name
Settings
Description
Reset
Access
[7:0]
USER_SCRATCHPAD2,
Bits[7:0]
0x00 to
0xFF
This register has no effect on device operation. It is available for serial
port debugging or register setting revision control. There are two
additional user scratch pad registers at Address 0x00A and Address 0x0FF.
0x00
RW
USER SCRATCH PAD 3 (REGISTER 0x0FF)
Table 61. Bit Descriptions for USER_SCRATCHPAD3 (Default: 0x00)
Bits
Bit Name
Settings
Description
Reset
Access
[7:0]
USER_SCRATCHPAD3,
Bits[7:0]
0x00 to
0xFF
This register has no effect on device operation. It is available for serial port
debugging or register setting revision control. There are two additional user
scratch pad registers at Address 0x00A and Address 0x0FE.
0x00
RW



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