LMH2191屬于開發(fā)板套件編程器的評估演示板及套件。由美國德州儀器公司制造生產(chǎn)的LMH2191評估和演示板及套件該系列產(chǎn)品提供了一種方便的方法，在經(jīng)過驗證的實施環(huán)境中評估某些重點器件的性能或特性。評估方法通常有完善的文檔說明，并且視乎具體情況由評估軟件提供支持。產(chǎn)品通常由印刷電路板組成，板上已裝有重點器件以及必要或有用的支持元器件，另外也可能包括其他組件，例如電纜或電源。對于數(shù)量特別多或類別獨特的器件類別(如 ADC、DAC 和開關(guān)模式電源)，評估平臺可組合為一個單獨的產(chǎn)品系列。

1FEATURES

2? One Input Clock, Two Output Clocks

? 1.8V Square Wave Clock Outputs

? Inverted Clock Outputs

? Independent Clock Requests

? High Isolation of Supply Noise to Clock Input

? High Output-to-Output Isolation

? Integrated 1.8V Low-Dropout Regulator

– Low Output-Noise Voltage

– 10 mA Load Current

? EMI Filtering

? Ultra Low Standby Current

? VBAT Range = 2.5V to 5.5V

? 8-Bump DSBGA Package

APPLICATIONS

? Mobile Handsets

? Portable Equipment

DESCRIPTION

The LMH2191 is a dual-channel clock tree driver that

supplies a digital system clock to peripherals in

mobile handsets or other applications. It provides a

solution to clocking issues such as limited drive

capability for fanout or longer traces. It also provides

protection of the master clock from varying loads and frequency pulling effects, isolation from noisy

modules, and crosstalk isolation. It has very low

phase noise which enables it to drive sensitive

modules such as Wireless LAN and Bluetooth.

The LMH2191 can be clocked up to 52 MHz and has

an independent clock request pin for each clock output which allows the peripheral to control the

clock. It features an integrated 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 LMH2191 dual clock

distributor is offered in a tiny 1.61 mm x 1.063 mm 8- bump DSBGA package. Its small size and low supply

current make it ideal for portable applications.