FEMTOCLOCKTM CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER IDT / ICS 3" />
參數(shù)資料
型號(hào): ICS843252AGLFT
廠商: IDT, Integrated Device Technology Inc
文件頁(yè)數(shù): 3/16頁(yè)
文件大?。?/td> 0K
描述: IC SYNTHESIZER LVPECL 16-TSSOP
標(biāo)準(zhǔn)包裝: 2,500
系列: HiPerClockS™, FemtoClock™
類型: 頻率合成器
PLL:
輸入: 晶體
輸出: LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 1:2
差分 - 輸入:輸出: 無/是
頻率 - 最大: 625MHz
除法器/乘法器: 是/無
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: 16-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 16-TSSOP
包裝: 帶卷 (TR)
其它名稱: 843252AGLFT
ICS843252
FEMTOCLOCKTM CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER
IDT / ICS 3.3V LVPECL FREQUENCY SYNTHESIZER
11
ICS843252AG REV. A NOVEMBER 3, 2008
Schematic Example
Figure 5 shows an example of ICS843252 application schematic.
In this example, the device is operated at VCC = 3.3V. The 18pF
parallel resonant 25MHz crystal is used. The C1 = 22pF and C2 =
22pF are recommended for frequency accuracy. For different
board layouts, the C1 and C2 may be slightly adjusted for
optimizing frequency accuracy. Two examples of LVPECL
terminations are shown in this schematic. Additional termination
approaches are shown in the LVPECL Termination Application
Note.
Figure 5. ICS843252 Schematic Example
X1
25MHz
To Logic
Input
pins
VCCA
R8
50
+
-
VCCO_B
C4
0.1u
Optional
LVPECL
Y-Termination
3.3V
QA
VCCO_A
QA
R1
133
R5
10
RU2
Not Install
nQA
QB
SELB1
C3
0.1u
Logic Input Pin Examples
Zo = 50 Ohm
R9
50
C1
22pF
1 8 p F
To Logic
Input
pins
+
-
Zo = 50 Ohm
nQA
R3
82.5
VCCO_A=3.3V
RU1
1K
C5
0.1u
FB_SEL
R4
82.5
C2
22pF
Zo = 50 Ohm
nQB
Set Logic
Input to
'0'
VCC
RD1
Not Install
VCC
R7
50
Zo = 50 Ohm
QB
nQB
SELA0
VCCO_B=3.3V
U1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
nQB
QB
VCCO_B
SELB1
SELB0
VCCO_A
QA
nQA
FB_SEL
VCCA
VCC
SELA0
SELA1
VEE
XTAL_OUT
XTAL_IN
RD2
1K
VCC=3.3V
Set Logic
Input to
'1'
VCC
SELA1
C7
0.1u
C6
10u
VCC
SELB0
R2
133
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