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| 型号： | ICS83PR226BKI-01LFT |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 3/23页 |
| 文件大小： | 0K |
| 描述： | IC SYNTHESIZER PROGR 10-VFQFPN |
| 标准包装： | 2,500 |
| 系列： | HiPerClockS™, FemtoClock™ |
| 类型： | 时钟/频率合成器 |
| PLL： | 是 |
| 输入： | 晶体 |
| 输出： | LVPECL |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:1 |
| 差分 - 输入:输出： | 无/是 |
| 频率 - 最大： | 213.33MHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 2.375 V ~ 3.465 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VQFN 裸露焊盘 |
| 供应商设备封装： | 10-VFQFPN（5x7） |
| 包装： | 带卷 (TR) |
| 其它名称： | 83PR226BKI-01LFT |
ICS83PR226BKI-01 REVISION B AUGUST 10, 2010
11
2010 Integrated Device Technology, Inc.
ICS83PR226I-01 Data Sheet
PROGRAMMABLE FEMTOCLOCK LVPECL OSCILLATOR REPLACEMENT
Crystal Input Interface
The ICS83PR226I-01 has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in Figure 1 below
were determined using an 18pF parallel resonant crystal and were
chosen to minimize the ppm error.
Figure 1. Crystal Input Interface
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 2A. 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 2A. General Diagram for LVCMOS Driver to XTAL Input Interface
Figure 2B. General Diagram for LVPECL Driver to XTAL Input Interface
XTAL_IN
XTAL_OUT
X1
18pF Parallel Crystal
C1
27pF
C2
27pF
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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