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LMX2581 Datasheet(PDF) 1 Page - Texas Instruments

No. de pieza LMX2581
Descripción Electrónicos  Wideband Frequency Synthesizer
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LMX2581 Datasheet(HTML) 1 Page - Texas Instruments

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OSCin
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Divider
Fractional
N Divider
2X
MUX
Serial Interface
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LMX2581
SNAS601G – AUGUST 2012 – REVISED SEPTEMBER 2014
LMX2581 Wideband Frequency Synthesizer with Integrated VCO
1 Features
3 Description
The LMX2581 is a low noise wideband frequency
1
Output Frequency from 50 to 3760 MHz
synthesizer that integrates a delta-sigma fractional N
Input Clock Frequency up to 900 MHz
PLL,
multiple
core
VCO,
programmable
output
Phase Detector Frequency up to 200 MHz
divider, and two differential output buffers. The VCO
frequency range is from 1880 to 3760 MHz and can
Supports Fractional and Integer Modes
be sent directly to the output buffers or divided down
–229 dBc/Hz Normalized PLL Phase Noise
by even values from 2 to 38. Each buffer is capable
–120.8 dBc/Hz Normalized PLL 1/f Noise
of output power from -3 to +12 dBm at 2700 MHz.
Integrated low noise LDOs are used for superior
–137 dBc/Hz VCO Phase Noise @ 1 MHz offset
noise immunity and consistent performance.
for a 2.5 GHz Carrier
100 fs RMS Jitter in Integer Mode
This synthesizer is a highly programmable device and
it enables the user to optimize its performance. In
Programmable Fractional Modulator Order
fractional mode, the denominator and the modulator
Programmable Fractional Denominator
order are programmable and can be configured with
Programmable Output Power up to +12 dBm
dithering as well. The user also has the ability to
directly specify a VCO core or entirely bypass the
Programmable 32 Level Charge Pump Current
internal VCO. Finally, many convenient features are
Programmable Option to Use an External VCO
included such as power down, Fastlock, auto mute,
Digital Lock Detect
and lock detection. All registers can be programmed
3-Wire Serial Interface and Readback
through a simple 3 wire interface and a read back
feature is also available.
Single Supply Voltage from 3.15 V to 3.45 V
Supports Logic Levels down to 1.6 V
The LMX2581 operates on a single 3.3 V supply and
comes in a 32 pin 5.0 mm × 5.0 mm WQFN package.
2 Applications
Device Information(1)
Wireless Infrastructure (UMTS, LTE, WiMax,
PART NUMBER
PACKAGE
BODY SIZE (NOM)
Multi-Standard Base Stations)
LMX2581
WQFN (32)
5.00 mm × 5.00 mm
Broadband Wireless
(1) For all available packages, see the orderable addendum at
Test and Measurement
the end of the datasheet.
Clock Generation
4 Simplified Schematic
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


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