- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376462 > XRT8010 (Exar Corporation) 312MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS PDF資料下載
參數(shù)資料
| 型號： | XRT8010 |
| 廠商： | Exar Corporation |
| 英文描述： | 312MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS |
| 中文描述： | 312MHz的時鐘 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大?。?/td> | 256K |
| 代理商： | XRT8010 |
XRT8010
REV. 1.0.2
312MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS
6
1.0
The XRT8010 synthesizer jitter performance is optimized by calibration of its Voltage Controlled Oscillator
(VCO) upon initial power application. This power ON calibration procedure is automatic and completely trans-
parent to the user. It is initiated automatically upon first application of VDD. In order to bring the center fre-
quency of the VCO close to the desired output frequency, the VCO bias current is adjusted via a current DAC
at initial power application. The center frequency of VCO is checked against input reference frequency and cal-
ibrated internally to the desired output frequency value. These bias voltage trim bits are then held in latches for
as long as the VDD is held above 2.7V (minimum specified operational value of VDD). The user should note
the following important facts about this calibration procedure for proper operation of the XRT8010:
For proper operation of the chip and to achieve lowest jitter, the user should follow layout guidelines as
described in the User Guide.
An input crystal of appropriate frequency should be connected at XTAL1 and XTAL2 pins before power is
applied to the chip.
All VDD pins should be tied to 3.3V ±10% simultaneously.
The power supply should turn on without bouncing below 2.0V smoothly to its specified value in no more
than 50msec.
The calibration takes place during VDD ramp up between 2.6V to 3V values. Once the VDD reaches and
maintains 3.0V, the chip retains the calibrated VCO bias voltages in internal latches for proper operation.
To change a widely different value of crystal or input reference frequency, it is recommended to power
down the chip by bringing VDD to 0V and restarting after the change in frequency has occurred.
CALIBRATION
2.0
It is recommended that a Fundamental Mode Crystal be used as the timing reference of the XRT8010. The fol-
lowing part has been qualified by EXAR:
CITIZEN Quartz Crystals
20 MHz : HCM49-20.000MABJT
40 MHz : HCM49-40.000MABJT
CRYSTAL SELECTION
3.0
All plots were recorded using the following parameters and test setup:
VDD = 3.3 V
2” 100
Differential Transmission Lines (from LVDS outputs to receiver inputs)
Fundamental Mode Crystal of 20 MHz
Vref = 1.5 V (PECL Receiver)
DATA AND PLOTS
T
ABLE
3: P
OWER
-
DOWN AND
O
UTPUT TRI
-
STATE SELECTION TABLE
PD P
IN
8
OE P
IN
7
S
TATUS
N
OTES
1
X
Outputs tri-stated and chip Powered-down “X” = don't care
0
1
Output tri-stated
PD and OE have a 50K
pull-down resistor to ground
on chip
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XRT8010IL | 312MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS |
| XRT8020 | 650 MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS |
| XRT8020IL | 650 MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS |
| XRT81L27IV | SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY |
| XRT81L27 | Seven Channel E1 Line Interface Unit with Clock Recovery(7通道 E1線接口單元（帶時鐘恢復(fù)）) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT8010ES | 功能描述:鎖相環(huán) - PLL 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 |
| XRT8010IL | 制造商:EXAR 制造商全稱:EXAR 功能描述:312MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS |
| XRT8010IL-F | 功能描述:鎖相環(huán) - PLL . . 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 |
| XRT8020 | 制造商:EXAR 制造商全稱:EXAR 功能描述:650 MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS |
| XRT8020ES | 功能描述:鎖相環(huán) - PLL 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。