參數(shù)資料
型號: AD9522-5BCPZ
廠商: Analog Devices Inc
文件頁數(shù): 18/76頁
文件大?。?/td> 0K
描述: IC CLOCK GEN 2.4GHZ 64LFCSP
標(biāo)準(zhǔn)包裝: 1
類型: 時(shí)鐘發(fā)生器,扇出配送
PLL:
輸入: CMOS,LVDS,LVPECL
輸出: CMOS,LVDS
電路數(shù): 1
比率 - 輸入:輸出: 2:12,2:24
差分 - 輸入:輸出: 是/是
頻率 - 最大: 2.4GHz
除法器/乘法器: 是/無
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 64-LFCSP-VQ(9x9)
包裝: 托盤
AD9522-5
Rev. 0 | Page 25 of 76
THEORY OF OPERATION
OPERATIONAL CONFIGURATIONS
The AD9522 can be configured in several ways. These
configurations must be set up by loading the control registers
(see Table 43 to Table 54). Each section or function must be
individually programmed by setting the appropriate bits in the
corresponding control register or registers. When the desired
configuration is programmed, the user can store these values in
the on-board EEPROM to allow the part to power up in the
desired configuration without user intervention.
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).
For clock distribution applications where the external clock is
<1600 MHz, the register settings shown in Table 19 should be used.
Table 19. 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
When using the PLL with an external VCO < 1600 MHz, the PLL
must be turned on.
Table 20. Settings for Using the 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
0x010 to 0x01F
An external VCO/VCXO requires an external loop filter that
must be connected between CP 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 21. 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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