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| 型号： | ICS840S07BYILFT |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 167.67 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, MS-026ABA, TQFP-32 |
| 文件页数： | 2/15页 |
| 文件大小： | 244K |
| 代理商： | ICS840S07BYILFT |
IDT / ICS LVCMOS FREQUENCY SYNTHESIZER
10
ICS840S07BYI REV. A NOVEMBER 7, 2007
ICS840S07I
CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY SYNTHESIZER
PRELIMINARY
FIGURE 3. GENERAL DIAGRAM FOR LVCMOS DRIVER TO XTAL INPUT INTERFACE
LVCMOS TO 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 3. The XTAL_OUT pin can be left floating. The
input edge rate can be as slow as 10ns. For LVCMOS inputs, it is
recommended that the amplitude be reduced from full swing to
half swing in order to prevent signal interference with the power
rail and to reduce noise. 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
Ω applications, R1
and R2 can be 100
Ω.This can also be accomplished by removing
R1 and making R2 50
Ω.
R2
Zo = 50
VDD
Ro
Zo = Ro + Rs
R1
VDD
XTAL_IN
XTAL_OUT
.1uf
Rs
CRYSTAL INPUT INTERFACE
The ICS840S07I has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in Figure 2 below
FIGURE 2. CRYSTAL INPUt INTERFACE
were determined using a 25MHz, 18pF parallel resonant crystal
and were chosen to minimize the ppm error.
ICS84332
XTAL_IN
XTAL_OUT
X1
18pF Parallel Cry stal
C2
22p
C1
22p
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS841003AKI-02LF | 制造商:Integrated Device Technology Inc 功能描述: |
| ICS841202AK-245LF | 功能描述:IC CLOCK SYNTHESIZER 32-VFQFPN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT |
| ICS841202AK-245LFT | 功能描述:IC CLOCK SYNTHESIZER 32-VFQFPN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT |
| ICS841202AKI-245LF | 功能描述:IC CLOCK SYNTHESIZER 32-VFQFPN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT |
| ICS841202AKI-245LFT | 功能描述:IC CLOCK SYNTHESIZER 32-VFQFPN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT |
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