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参数资料
| 型号： | 83PN625DKILF |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | XO, clock |
| 英文描述： | 625 MHz, OTHER CLOCK GENERATOR, QCC10 |
| 封装： | 5 X 7 MM, 1 MM PITCH, ROHS COMPLIANT, VFQFN-10 |
| 文件页数： | 17/17页 |
| 文件大小： | 1314K |
| 代理商： | 83PN625DKILF |
ICS83PN625I Data Sheet
PROGRAMMABLE FEMTOCLOCK NG LVPECL OSCILLATOR REPLACEMENT
ICS83PN625DKI REVISION A MARCH 17, 2010
9
2010 Integrated Device Technology, Inc.
Crystal Input Interface
The ICS83PN625I has been characterized with 12pF parallel
resonant crystals. The capacitor values shown in Figure 2A below
were determined using a 25MHz, 12pF parallel resonant crystal and
were chosen to minimize the ppm error. Other parallel resonant
crystal’s values can be used. For example, a crystal with a CL = 18pF
can be used, but would require the tuning capacitors to be adjusted.
Figure 2A. Crystal Input Interface, using 12pF crystal
Figure 2B. Crystal Input Interface, using 18pF crystal
Overdriving the XTAL Interface
The XTAL_IN input can accept a single-ended LVCMOS signal
through an AC coupling capacitor. A general interface diagram is
shown in Figure 3A. The XTAL_OUT pin can be left floating. The
maximum amplitude of the input signal should not exceed 2V and the
input edge rate can be as slow as 10ns. This configuration requires
that the output impedance of the driver (Ro) plus the series
resistance (Rs) equals the transmission line impedance. In addition,
matched termination at the crystal input will attenuate the signal in
half. This can be done in one of two ways. First, R1 and R2 in parallel
should equal the transmission line impedance. For most 50
applications, R1 and R2 can be 100
. This can also be
accomplished by removing R1 and making R2 50
. By overdriving
the crystal oscillator, the device will be functional, but note, the device
performance is guaranteed by using a quartz crystal.
Figure 3A. General Diagram for LVCMOS Driver to XTAL Input Interface
Figure 3B. General Diagram for LVPECL Driver to XTAL Input Interface
XTAL_IN
XTAL_OUT
X1
12pF Parallel Crystal
C1
4pF
C2
4pF
XTAL_IN
XTAL_OUT
X1
18pF Parallel Crystal
C1
16pF
C2
16pF
R2
100
R1
100
RS
43
Ro ~ 7 Ohm
Driv er_LVCMOS
Zo = 50 Ohm
C1
0.1uF
3.3V
Cry stal Input Interf ace
XTAL_IN
XTAL_OUT
Cry stal Input Interf ace
XTAL_IN
XTAL_OUT
R3
50
C1
0.1uF
R2
50
R1
50
Zo = 50 Ohm
LVPECL
Zo = 50 Ohm
VCC=3.3V
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相关代理商/技术参数 |
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| 83PN625DKILFT | 制造商:Integrated Device Technology Inc 功能描述:Programmable PLL Frequency Synthesizer Single 10-Pin VFQFN T/R 制造商:Integrated Device Technology Inc 功能描述:10 VFQFN (LEAD-FREE) - Tape and Reel |
| 83PR10 | 制造商:TT Electronics / BI Technologies 功能描述:Res Cermet Trimmer 10 Ohm 20% 1/2W 1(Elec)/1(Mech)Turn (6.35 X 8.12 X 4.57mm) Gull Wing SMD Box |
| 83PR100 | 制造商:TT Electronics / BI Technologies 功能描述:Res Cermet Trimmer 100 Ohm 10% 1/2W 1(Elec)/1(Mech)Turn (6.35 X 8.12 X 4.57mm) Gull Wing SMD Box |
| 83PR100K | 制造商:TT Electronics / BI Technologies 功能描述:Res Cermet Trimmer 100K Ohm 10% 1/2W 1(Elec)/1(Mech)Turn (6.35 X 8.12 X 4.57mm) Gull Wing SMD Box |
| 83PR100KLF | 制造商:TT Electronics / BI Technologies 功能描述:Res Cermet Trimmer 100K Ohm 10% 1/2W 1(Elec)/1(Mech)Turn (6.35 X 8.12 X 4.57mm) Gull Wing SMD Box |
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