参数资料
型号: AD9572ACPZLVD-RL
厂商: Analog Devices Inc
文件页数: 8/20页
文件大小: 0K
描述: IC PLL CLOCK GEN 25MHZ 40LFCSP
标准包装: 2,500
类型: 时钟发生器,扇出配送,多路复用器
PLL:
输入: 晶体
输出: CMOS,LVDS,LVPECL
电路数: 1
比率 - 输入:输出: 1:7
差分 - 输入:输出: 无/是
频率 - 最大: 156.25MHz
除法器/乘法器: 是/无
电源电压: 2.97 V ~ 3.63 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 40-WFQFN 裸露焊盘,CSP
供应商设备封装: 40-LFCSP-WQ(6x6)
包装: 带卷 (TR)
AD9572
Rev. B | Page 16 of 20
THEORY OF OPERATION
XTAL
OSC
REFCLK
REFSEL
VS
GND
BYPASS1
1
0
AD9572
DIVIDE
BY 5
DIVIDE
BY 4
DIVIDE
BY 5
DIVIDE
BY 3
33M
FORCE_LOW
CMOS
33.33MHz
0
1
0
125MHz/100MHz
LVPECL/
LVDS
100M/125M
125MHz/100MHz
LVPECL/
LVDS
25M
CMOS
PHASE
FREQUENCY
DETECTOR
CHARGE
PUMP
DIVIDE
BY 17
DIVIDE
BY 5
DIVIDE
BY 4
VLDO
VCO
106M
LVPECL/
LVDS
106.25MHz
106M
LDO
PHASE
FREQUENCY
DETECTOR
CHARGE
PUMP
DIVIDE
BY 25
DIVIDE
BY 4
DIVIDE
BY 4
VLDO
VCO
LDO
156M
156.25MHz
LVPECL/
LVDS
BYPASS2
07
49
8-
0
13
LEVEL
DECODE
FREQSEL
Figure 17. Detailed Block Diagram
Figure 17 shows a block diagram of the AD9572. The chip
combines dual PLL cores, which are configured to generate the
specific clock frequencies required for networking applications
without any user programming. This PLL is based on proven
Analog Devices synthesizer technology, noted for its exceptional
phase noise performance. The AD9572 is highly integrated and
includes loop filters, regulators for supply noise immunity, all
the necessary dividers with multiple output buffers in a choice
of formats, and a crystal oscillator. A user need only supply a
25 MHz reference clock or an external crystal to implement an
entire line card clocking solution that does not require any
processor intervention. A copy of the 25 MHz reference source
is also available.
OUTPUTS
Table 14 provides a summary of the outputs available.
Table 14. Output Formats
Frequency
Format
Copies
25 MHz
CMOS
1
106.25 MHz
LVPECL/LVDS
2
156.25 MHz
LVPECL/LVDS
1
100 MHz or 125 MHz
LVPECL/LVDS
2
33.33 MHz
CMOS
1
Note that the pins labeled 100M/125M can provide 100 MHz or
125 MHz by strapping the FREQSEL pin as shown in Table 15.
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