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LMH2190TM-38

更新时间： 2024-11-18 07:02:59
品牌 Logo 应用领域
美国国家半导体 - NSC 驱动器时钟
页数 文件大小 规格书
24页 540K
描述
Quad Channel 27 MHz Clock Tree Driver with I2C Interface

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中文翻译

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LMH2190TM-38 技术参数

是否Rohs认证： 不符合生命周期：Transferred
包装说明：VFBGA, BGA16,4X4,16Reach Compliance Code：compliant
HTS代码：8542.39.00.01风险等级：5.44
系列：2190输入调节：STANDARD
JESD-30 代码：S-PBGA-B16JESD-609代码：e0
长度：1.615 mm逻辑集成电路类型：LOW SKEW CLOCK DRIVER
功能数量：2反相输出次数：
端子数量：16实输出次数：4
最高工作温度：85 °C最低工作温度：-20 °C
封装主体材料：PLASTIC/EPOXY封装代码：VFBGA
封装等效代码：BGA16,4X4,16封装形状：SQUARE
封装形式：GRID ARRAY, VERY THIN PROFILE, FINE PITCH峰值回流温度（摄氏度）：NOT SPECIFIED
电源：3.5 V认证状态：Not Qualified
座面最大高度：0.675 mm子类别：Clock Drivers
最大供电电压 (Vsup)：5.5 V最小供电电压 (Vsup)：2.5 V
标称供电电压 (Vsup)：3.5 V表面贴装：YES
温度等级：OTHER端子面层：Tin/Lead (Sn/Pb)
端子形式：BALL端子节距：0.4 mm
端子位置：BOTTOM处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：1.615 mmBase Number Matches：1

LMH2190TM-38 数据手册

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October 7, 2009  
LMH2190  
Quad Channel 27 MHz Clock Tree Driver with I2C Interface  
General Description  
Features  
The LMH2190 is a quad channel configurable clock tree driver  
which supplies a digital system clock to peripherals in mobile  
handsets or other applications. It provides a solution to clock-  
ing issues such as limited drive capability for fanout or longer  
traces, protection of the master clock from varying loads and  
frequency pulling effects, isolation buffering from noisy mod-  
ules, and crosstalk isolation. It has very low phase noise  
which enables it to drive sensitive modules such as Wireless  
LAN and Bluetooth.  
1 input clock, 4 output clocks  
■
■
■
■
■
■
■
■
Supports both square or sine wave input  
1.8V square wave clock outputs  
Skewed clock outputs  
Independent clock request  
High isolation of supply noise to clock input  
High output to output Isolation  
Output Drive up to 50 pF  
The LMH2190 can be clocked up to 27 MHz, and has an in-  
dependent clock request pin for each clock output which  
allows the peripheral to control the clock. It features an inte-  
grated LDO which provides an ultra low noise voltage supply  
with 10 mA external load current which can be used to supply  
the TCXO or other clock source.  
The I2C serial interface can be used to override the default  
configuration of the device to optimize the LMH2190 for the  
application. Some of these programmable features include  
setting the polarity of both the clock and the clock request  
inputs. In addition, the clock outputs have programmable out-  
put drive current to optimize for the connected load. EMI  
switching noise can be controlled by configuring output drive  
and skew settings.  
EMI controlled output edges and EMI filtering  
■
■
Integrated 1.8V Low-Dropout Regulator  
Low Output Noise Voltage  
—
10 mA load current  
I2C Configurable up to 400 kHz (Fast Mode)  
—
■
■
■
Ultra low standby current  
VBAT range = 2.5V to 5.5V  
Applications  
Mobile handsets  
■
■
■
PDAs  
Portable Equipment  
The LMH2190 quad clock distributor is offered in a tiny  
1.615mm x 1.615mm 16 bump microSMD package. Its small  
size and low supply current make it ideal for portable appli-  
cations.  
Typical Application  
30083802  
© 2009 National Semiconductor Corporation  
300838  
www.national.com  
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