參數(shù)資料
型號: IDT5V9885TPFGI
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 3/39頁
文件大?。?/td> 0K
描述: IC CLOCK GEN PLL 500MHZ 32TQFP
標(biāo)準(zhǔn)包裝: 250
類型: *
PLL: 帶旁路
輸入: LVCMOS,LVTTL
輸出: LVCMOS,LVDS,LVPECL,LVTTL
電路數(shù): 1
比率 - 輸入:輸出: 2:6
差分 - 輸入:輸出: 無/是
頻率 - 最大: 500MHz
除法器/乘法器: 是/無
電源電壓: 3 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 32-LQFP
供應(yīng)商設(shè)備封裝: 32-TQFP(7x7)
包裝: 管件
其它名稱: 800-2579
11
INDUSTRIALTEMPERATURERANGE
IDT5V9885T
3.3V EEPROMPROGRAMMABLECLOCKGENERATOR
The spread spectrum parameters such as the modulation frequency and profile will not be enabled nor will it have any impact on the PLL output when the
PLL is programmed for fractional divide.
The following is an example of how to set the fractional divider.
Example
FIN = 20MHz, FOUT1 = 168.75MHz, FOUT2 = 350MHz
Solving for 350MHz using Eq.2 and Eq.3 with PLL0 and spread spectrum off,
350MHz = 20MHz * (M / D)/ (P * 2)
For better jitter performance, keep D as small as possible
(350MHz * 2/20MHz)= (M/P) = 35
Therefore, we have D = 1, M = 35 (N = 16, A = 2) for PLL0 with P = 1 on output bank4 resulting in 350MHz.
Solving for 168.75MHz with PLL1 and fractional divide enabled:
168.75MHz = 20MHz * (M / D)/(P * 2)
168.75MHz * 2/20MHz = M/P = 16.875/1 or 33.75/2
The 33.75 value is chosen to achieve the highest VCO frequency possible. Next step is to figure out the setting for the fractional divide using Eq.3.
33.75 = 2*N + A + 1 + SS_OFFSET * 1/64
Integer value 33 can be determined by N and A, thus leaving 0.75 left to be solved.
2*N + A + 1 = 33
SS_OFFSET = 64 * 0.75 = 48
Therefore, we have D=1, M=33.75 (N=15, A=2, SS_OFFSET=48) for PLL1 with P=2 on an output bank resulting in 168.75MHz.
The fractional divider can be determined if it is needed by following the steps in the previous example. Note that the 5V9885T should not be programmed
with TSSC > '0', SS_OFFSET = '0', and SD = '0' in order to prevent an unstable state in the modulator. The A[3:0] must be used and set to be greater than
'2' for a more accurate fractional divide.
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IDT5V9885TPFGI8 制造商:Integrated Device Technology Inc 功能描述:IC CLOCK GEN PLL 500MHZ 32TQFP
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