参数资料
型号: AD9520-0/PCBZ
厂商: Analog Devices Inc
文件页数: 24/80页
文件大小: 0K
描述: BOARD EVAL AD9520-0
设计资源: Synchronizing Multiple AD9910 1 GSPS Direct Digital Synthesizers (CN0121)
Phase Coherent FSK Modulator (CN0186)
AD9520 Eval Brd Schematic
AD9520 BOM
标准包装: 1
主要目的: 计时,时钟发生器
已用 IC / 零件: AD9520-0
已供物品:
AD9520-0
Data Sheet
Rev. A | Page 30 of 80
Mode 1—Clock Distribution or External VCO < 1600 MHz
When the external clock source to be distributed or the external
VCO/VCXO is <1600 MHz, a configuration that bypasses the
VCO divider can be used. This is the only difference from Mode 2.
Bypassing the VCO divider limits the frequency of the clock
source to <1600 MHz (due to the maximum input frequency
allowed at the channel dividers).
Configuration and Register Settings
For clock distribution applications where the external clock is
<1600 MHz, use the register settings shown in Table 23.
Table 23. Settings for Clock Distribution < 1600 MHz
Register
Description
0x010[1:0] = 01b
PLL asynchronous power-down (PLL off)
0x1E1[0] = 1b
Bypass the VCO divider as the source for the
distribution section
0x1E1[1] = 0b
Select CLK as the source
When the internal PLL is used with an external VCO < 1600 MHz,
the PLL must be turned on.
Table 24. Settings for Using Internal PLL with External VCO <
1600 MHz
Register
Description
0x1E1[0] = 1b
Bypass the VCO divider as the source
for the distribution section
0x010[1:0] = 00b
PLL normal operation (PLL on) along
with other appropriate PLL settings in
Register 0x010 to Register 0x01E
An external VCO/VCXO requires an external loop filter that
must be connected between the CP pin and the tuning pin of
the VCO/VCXO. This loop filter determines the loop bandwidth
and stability of the PLL. Make sure to select the proper PFD
polarity for the VCO/VCXO being used.
Table 25. Setting the PFD Polarity
Register
Description
0x010[7] = 0b
PFD polarity positive (higher control
voltage produces higher frequency)
0x010[7] = 1b
PFD polarity negative (higher control
voltage produces lower frequency)
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