参数资料
型号: 5P49EE502NDGI
厂商: IDT, Integrated Device Technology Inc
文件页数: 25/26页
文件大小: 0K
描述: IC CLOCK GENERATOR 20QFN
标准包装: 100
系列: VersaClock™
类型: 时钟发生器
PLL: 带旁路
输入: LVTTL,晶体
输出: LVCMOS,LVTTL
电路数: 1
比率 - 输入:输出: 1:5
差分 - 输入:输出: 无/无
频率 - 最大: 120MHz
除法器/乘法器: 是/无
电源电压: 1.71 V ~ 1.89 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-VFQFN 裸露焊盘
供应商设备封装: 20-VFQFPN(3x3)
包装: 管件
其它名称: 800-2522
IDT5P49EE502
VERSACLOCK LOW POWER CLOCK GENERATOR
EEPROM CLOCK GENERATOR
IDT VERSACLOCK LOW POWER CLOCK GENERATOR
8
IDT5P49EE502
REV L 072512
PLL Loop Bandwidth:
Charge pump gain (K
φ) = Ip / 2π
VCO gain (KVCO) = 350MHz/V * 2
π
M = Total multiplier value (See the PRE-SCALERS,
FEEDBACK-DIVIDERS, POST-DIVIDERS section for more
detail)
ωc = (Rz * Kφ * KVCO * Cz)/(M * (Cz + Cp))
Fc =
ωc / 2π
Note, the phase/frequency detector frequency (FPFD) is
typically seven times the PLL closed-loop bandwidth (Fc)
but too high of a ratio will reduce your phase margin thus
compromising loop stability.
To determine if the loop is stable, the phase margin (
φm)
would need to be calculated as follows.
Phase Margin:
ωz = 1 / (Rz * Cz)
ωp = (Cz + Cp)/(Rz * Cz * Cp)
φm = (360 / 2π) * [tan-1(ωc/ ωz) - tan-1(ωc/ ωp)]
To ensure stability in the loop, the phase margin is
recommended to be > 60° but too high will result in the lock
time being excessively long. Certain loop filter parameters
would need to be compromised to not only meet a required
loop bandwidth but to also maintain loop stability.
Damping Factor:
ζ= Rz/2 *(KVCO * Ip * Cz)1/2/M
Example
Fc = 150KHz is the desired loop bandwidth. The total A*M
value is 160. The
ζ(damping factor) target should be 0.7,
meaning the loop is critically damped. Given Fc and A*M, an
optimal loop filter setting needs to be solved for that will
meet both the PLL loop bandwidth and maintain loop
stability.
Choose a mid-range charge pump from register table
Icp= 11.9uA.
K
φ * KVCO = 350MHz/V * 40uA = 12000A/Vs
ωc = 2π * Fc = 9.42x105 s-1
ωp = (Cz + Cp)/(Rz * Cz * Cp) = ωz (1 + Cz / Cp)
Solving for Rz, the best possible value Rz=30kOhms
(RZ[1:0]=10) gives
ζ= 1.4 (Ideal range for ζ is 0.7 to 1.4)
Solving back for the PLL loop bandwidth, Fc=149kHz.
The phase margin must be checked for loop stability.
φm = (360 / 2π) * [tan-1 (9.42x105 s-1 / 1.19x105s-1)
- tan-1(9.42x105 s-1/ 1.23x106 s-1)] = 45°
The phase margin would be acceptable with a fairly stable
loop.
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