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參數(shù)資料
| 型號(hào)： | 5P49EE602NLGI |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 23/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CLOCK GENERATOR 24QFN |
| 標(biāo)準(zhǔn)包裝： | 75 |
| 系列： | VersaClock™ |
| 類型： | 時(shí)鐘發(fā)生器 |
| PLL： | 帶旁路 |
| 輸入： | LVTTL，晶體 |
| 輸出： | LVCMOS，LVTTL |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 2:5 |
| 差分 - 輸入:輸出： | 無/是 |
| 頻率 - 最大： | 120MHz |
| 除法器/乘法器： | 是/無 |
| 電源電壓： | 1.71 V ~ 1.89 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 24-QFN（4x4） |
| 包裝： | 管件 |
| 其它名稱： | 800-2525 |
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IDT5P49EE602
VERSACLOCK LOW POWER CLOCK GENERATOR
EEPROM CLOCK GENERATOR
IDT VERSACLOCK LOW POWER CLOCK GENERATOR
6
IDT5P49EE602
REV L 072512
SPREAD SPECTRUM GENERATION
(PLLB)
PLLB has spread spectrum generation capability, which
users have the option of turning on and off. Spread
spectrum profile, frequency, and spread are fully
programmable (within limits). The programmable spread
spectrum generation parameters are NC[10:0], MOD[12:0],
and NSS[10:0] bits. To enable spread spectrum, set
SSENB_B=0.
The spread spectrum circuitry was specifically developed to
accommodate video display applications. The spread
modulation frequency can be defined to exactly equal the
horizontal line frequency (HSYNC)
NC[10:0]
These bits are used to determine the number of pulses per
spread spectrum cycle. For video applications, NC is the
number of pixels on the horizontal display row (or integer
multiple of displayed pixels in a row). By matching the
spread period to the screen, no tearing or “shimmer” will be
apparent.
NC must be an even number to insure that the upward
spread transition has the same number of steps as the
downward spread transition.
For non-video applications, this can also be seen as the
number of clock cycles for a complete spread spectrum
period.
MOD[12:0]
These bits relate the reference frequency to the target
average spread output frequency (FMID). FMID is the
midpoint between FMAX (maximum frequency) and FMIN
(minimum frequency).
FMID = (FMAX + FMIN) / 2
MOD = (FREF * NC) / (2 * FMID)
NSS[10:0]
These bits control the amplitude of the spread modulation.
NSS = (NC / 2) + (NC / 8) * (FMAX - FMIN) / FMID
Modulation frequency:
FMOD = FMID / NC (Eq. 11)
Video Example
FREF = 25MHz, FOUT = 27 MHz, 640 pixels per line, center
spread of ±1%. Find the necessary spread spectrum
register settings.
FMID = FOUT
NC = 640 or 320 or 160 (integer number of spread
periods/screen)
MOD = (25MHz * 640)/(2 * 27MHz) = 296
NSS = (640/2)+(640/8)*(27.27MHz-26.73MHz)/27MHz =
322.
FMOD = 27MHz/640 = 42.2kHz.
Non-Video Example
FREF = 25MHz, FOUT = 27 MHz, 32kHz modulation rate,
center spread of ±1%. Find the necessary spread spectrum
register settings.
FMID = FOUT
FMOD = 32kHz = 27MHz/NC.
NC = 844
MOD = (25MHz * 844)/(2 * 27MHz) = 391
NSS = (844/2)+(844/8)*(27.27MHz-26.73MHz)/27MHz =
424.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 5P49EE602NLGI8 | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 VERSACLOCK LOW POWER PLL RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| 5P49EE605NLGI | 功能描述:鎖相環(huán) - PLL PROGRAMMABLE PLL LOW POWER 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 |
| 5P49EE605NLGI8 | 制造商:Integrated Device Technology Inc 功能描述:VERSACLOCK LOW POWER CLOCK GENERATOR 制造商:Integrated Device Technology Inc 功能描述:24 QFN (GREEN) - Tape and Reel |
| 5P49EE801NDGI | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 VERSACLOCK LOW POWER PLL RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| 5P49EE801NDGI8 | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 VERSACLOCK LOW POWER PLL RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
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