For VDD
參數(shù)資料
型號(hào): MC145151DW2
廠商: Freescale Semiconductor
文件頁(yè)數(shù): 13/24頁(yè)
文件大小: 0K
描述: IC PAR-IN PLL FREQ SYNTH 28-SOIC
標(biāo)準(zhǔn)包裝: 26
類型: PLL 時(shí)鐘/頻率合成器
PLL:
輸入: 時(shí)鐘
輸出: CMOS
電路數(shù): 1
比率 - 輸入:輸出: 1:1
差分 - 輸入:輸出: 無(wú)/無(wú)
頻率 - 最大: 25MHz
除法器/乘法器: 是/無(wú)
電源電壓: 3 V ~ 9 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 28-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 28-SOIC W
包裝: 管件
MC145151-2 and MC145152-2 Technical Data, Rev. 5
20
Freescale Semiconductor
Design Considerations
For VDD = 5.0 V, the crystal should be specified for a loading capacitance, CL, which does not exceed
32 pF for frequencies to approximately 8.0 MHz, 20 pF for frequencies in the area of 8.0 to 15 MHz, and
10 pF for higher frequencies. These are guidelines that provide a reasonable compromise between IC
capacitance, drive capability, swamping variations in stray and IC input/output capacitance, and realistic
CL values. The shunt load capacitance, CL, presented across the crystal can be estimated to be:
where
Cin = 5 pF (see Figure 14)
Cout = 6 pF (see Figure 14)
Ca = 1 pF (see Figure 14)
CO = the crystal's holder capacitance (see Figure 15)
C1 and C2= external capacitors (see Figure 13)
Figure 14. Parasitic Capacitances of the Amplifier
Figure 15. Equivalent Crystal Networks
The oscillator can be “trimmed” on-frequency by making a portion or all of C1 variable. The crystal and
associated components must be located as close as possible to the OSCin and OSCout pins to minimize
distortion, stray capacitance, stray inductance, and startup stabilization time. In some cases, stray
capacitance should be added to the value for Cin and Cout.
Power is dissipated in the effective series resistance of the crystal, Re, in Figure 15. The drive level
specified by the crystal manufacturer is the maximum stress that a crystal can withstand without damage
or excessive shift in frequency. R1 in Figure 13 limits the drive level. The use of R1 may not be necessary
in some cases (i.e., R1 = 0
).
CL =
CinCout
Cin + Cout
+ Ca + Co +
C1C2
C1+C2
Cin
Cout
Ca
NOTE: Values are supplied by crystal manufacturer
(parallel resonant crystal).
2
1
2
1
2
1
RS
LS
CS
Re
Xe
CO
相關(guān)PDF資料
PDF描述
CS3108A-40-62S CONN PLUG 60POS RT ANG W/SCKT
CS3102A-20-70P CONN RCPT 17POS BOX MNT W/PINS
CS3108A-40-53S CONN PLUG 60POS RT ANG W/SCKT
CS3106A-22-57P CONN PLUG 19POS STRAIGHT W/PINS
CS3106A-24-64P CONN PLUG 16POS STRAIGHT W/PINS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC145151DW2R2 功能描述:IC PAR-IN PLL FREQ SYNTH 28-SOIC RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器,PLL,頻率合成器 系列:- 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無(wú)/無(wú) 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
MC145151P2 制造商:Motorola Inc 功能描述:Frequency Synthesizer, 28 Pin, Plastic, DIP
MC145152DW2 功能描述:鎖相環(huán) - PLL PLL Synthesizer RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray
MC145152DW2R2 功能描述:IC PAR-IN PLL FREQ SYNTH 28-SOIC RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器,PLL,頻率合成器 系列:- 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無(wú)/無(wú) 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
MC145155P 制造商:Motorola Inc 功能描述: