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LMH2190 Datasheet Preview

LMH2190 Datasheet

Clock Tree Driver

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LMH2190
www.ti.com
SNAS473H – JUNE 2009 – REVISED MAY 2013
LMH2190 Quad Channel 27 MHz Clock Tree Driver with I2C Interface
Check for Samples: LMH2190
FEATURES
1
2 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
• 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
DESCRIPTION
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 clocking 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 modules, and crosstalk isolation. It has very low
phase noise which enables it to drive sensitive
modules such as Wireless LAN and Bluetooth.
The LMH2190 can be clocked up to 27 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 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 output
drive current to optimize for the connected load. EMI
switching noise can be controlled by configuring
output drive and skew settings.
The LMH2190 quad clock distributor is offered in a
tiny 1.61mm x 1.61mm 16 bump DSBGA package. Its
small size and low supply current make it ideal for
portable applications.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009–2013, Texas Instruments Incorporated




etcTI

LMH2190 Datasheet Preview

LMH2190 Datasheet

Clock Tree Driver

No Preview Available !

LMH2190
SNAS473H – JUNE 2009 – REVISED MAY 2013
Typical Application
VBAT
CBAT
1 PF
VOUT B1
COUT
2.2 PF
VBAT
A1
1.8V LDO, 10 mA
A3 CLK1
CCLK
10 nF
CIN
VDD
470 pF SCLK_IN C1
CLOCK
GND EN
SCLK_REQ C2
CLOCK
TREE
DRIVER
CPU/
BASE
BAND
R1,2
5.1 k:
CONTROL
LOGIC
ENABLE A2
SCL D2
I2C
SDA D1
CLOCK
REQUEST
LMH2190 B2
A4 CLK2
D4 CLK3
D3 CLK4
B3 CLK_REQ1
B4 CLK_REQ2
C4 CLK_REQ3
C3 CLK_REQ4
VSS
www.ti.com
PERIPHERAL
PERIPHERAL
PERIPHERAL
PERIPHERAL
2
Submit Documentation Feedback
Product Folder Links: LMH2190
Copyright © 2009–2013, Texas Instruments Incorporated


Part Number LMH2190
Description Clock Tree Driver
Maker etcTI
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LMH2190 Datasheet PDF






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