參數(shù)資料
型號: ICS8745BM-21LFT
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 2/19頁
文件大?。?/td> 0K
描述: IC CLK GEN 1:1 DIFF-LVDS 20-SOIC
標(biāo)準(zhǔn)包裝: 1,000
系列: HiPerClockS™
類型: 時(shí)鐘發(fā)生器
PLL: 帶旁路
輸入: HCSL,LVDS,LVHSTL,LVPECL,SSTL
輸出: LVDS
電路數(shù): 1
比率 - 輸入:輸出: 1:1
差分 - 輸入:輸出: 是/是
頻率 - 最大: 700MHz
除法器/乘法器: 是/是
電源電壓: 3.135 V ~ 3.465 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 20-SOIC
包裝: 帶卷 (TR)
其它名稱: 8745BM-21LFT
ICS8745BM-21 REVISION D JANUARY 25, 2010
10
2010 Integrated Device Technology, Inc.
ICS8745B-21 Data Sheet
1:1 DIFFERENTIAL-TO-LVDS ZERO DELAY CLOCK GENERATOR
Application Information
Power Supply Filtering Technique
As in any high speed analog circuitry, the power supply pins are
vulnerable to random noise. To achieve optimum jitter performance,
power supply isolation is required. The ICS8745B-21 provides
separate power supplies to isolate any high switching noise from the
outputs to the internal PLL. VDD, VDDA and VDDO should be
individually connected to the power supply plane through vias, and
0.01F bypass capacitors should be used for each pin. Figure 1
illustrates this for a generic VDD pin and also shows that VDDA
requires that an additional 10
resistor along with a 10F bypass
capacitor be connected to the VDDA pin.
Figure 1. Power Supply Filtering
Wiring the Differential Input to Accept Single Ended Levels
Figure 2 shows how the differential input can be wired to accept
single ended levels. The reference voltage V_REF = VDD/2 is
generated by the bias resistors R1, R2 and C1. This bias circuit
should be located as close as possible to the input pin. The ratio of
R1 and R2 might need to be adjusted to position the V_REF in the
center of the input voltage swing. For example, if the input clock swing
is only 2.5V and VDD = 3.3V, V_REF should be 1.25V and R2/R1 =
0.609.
Figure 2. Single-Ended Signal Driving Differential Input
VDD
VDDA
3.3V
10
10F
.01F
V_REF
Single Ended Clock Input
VDD
CLK
nCLK
R1
1K
C1
0.1u
R2
1K
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