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参数资料
| 型号： | 5P49EE602NLGI |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 23/26页 |
| 文件大小： | 0K |
| 描述： | IC CLOCK GENERATOR 24QFN |
| 标准包装： | 75 |
| 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： | 2:5 |
| 差分 - 输入:输出： | 无/是 |
| 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： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN（4x4） |
| 包装： | 管件 |
| 其它名称： | 800-2525 |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| 5P49EE602NLGI8 | 功能描述:时钟发生器及支持产品 VERSACLOCK LOW POWER PLL RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| 5P49EE605NLGI | 功能描述:锁相环 - PLL PROGRAMMABLE PLL LOW POWER RoHS:否 制造商:Silicon Labs 类型:PLL Clock Multiplier 电路数量:1 最大输入频率:710 MHz 最小输入频率:0.002 MHz 输出频率范围:0.002 MHz to 808 MHz 电源电压-最大:3.63 V 电源电压-最小:1.71 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:QFN-36 封装: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:时钟发生器及支持产品 VERSACLOCK LOW POWER PLL RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| 5P49EE801NDGI8 | 功能描述:时钟发生器及支持产品 VERSACLOCK LOW POWER PLL RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
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