LMX2582 Datasheet, PDF (1/40 Pages) Texas Instruments – High Performance, Wideband PLLatinum RF Synthesizer

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LMX2582
SNAS680A – DECEMBER 2015 – REVISED DECEMBER 2015
LMX2582 High Performance, Wideband PLLatinum™ RF Synthesizer with Integrated VCO
1 Features
•1 Output Frequency Range from 20 to 5500 MHz
• Industry Leading Phase Noise Performance
– VCO Phase Noise: –144.5 dBc/Hz at 1-MHz
Offset for 1.8 GHz Output
– Normalized PLL Noise Floor: –231 dBc/Hz
– Normalized PLL Flicker Noise: –126 dBc/Hz
– 47 fs RMS Jitter (12 kHz to 20 MHz) for 1.8
GHz Output
• Input Clock Frequency up to 1400 MHz
• Phase Detector Frequency up to 200 MHz,
and up to 400 MHz in Integer-N Mode
• Supports Fractional-N and Integer-N Modes
• Dual Differential Outputs
• Innovative Solution to Reduce Spurs
• < 25-µs Fast Calibration Mode
• Programmable Phase Adjustment
• Programmable Charge Pump Current
• Programmable Output Power Level
• SPI or uWire (4-Wire Serial Interface)
• Single Power Supply Operation: 3.3 V
2 Applications
• Test/Measurement Equipment
• Cellular Base-station
• Microwave Backhaul
• High-Performance Clock Source for High-Speed
Data Converters
• Software Defined Radio
3 Description
The LMX2582 is a low-noise, wideband RF PLL with
integrated VCO that supports a frequency range from
20 MHz to 5.5 GHz. The device supports both
fractional-N and integer-N modes, with a 32-bit
fractional divider allowing fine frequency selection.
Integrated noise of 47 fs for 1.8 GHz output makes it
an ideal low noise source. Combining best-in-class
PLL and integrated VCO noise with integrated LDOs,
this device removes the need for multiple discrete
devices in high performance systems.
The device accepts input frequencies up to 1.4 GHz,
which combined with frequency dividers and
programmable low noise multiplier allows flexible
frequency planning. The additional programmable low
noise multiplier lets users mitigate the impact of
integer boundary spurs. In Fractional-N mode, the
device can adjust the output phase by a 32-bit
resolution. For applications that need fast frequency
changes, the device supports a fast calibration option
which takes less than 25 us.
This performance is achieved by using single 3.3-V
supply. It supports 2 flexible differential outputs that
can be configured as single-ended outputs as well.
Users can choose to program one output from the
VCO and the second from the channel divider. When
not being used, each output can be muted
separately.
Device Information ⁽¹⁾
PART NUMBER
DESCRIPTION BODY SIZE (NOM)
LMX2582RHAT
LMX2582RHAR
WQFN (40)
6 mm x 6 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
(2) T = Tape; R = Reel
Simplified Schematic
External Loop Filter
Input
Signal
OSCinP
(pin 8)
OSCinM
(pin 9)
OSCin
Buffer
OSCin
Douber
Pre-R
Divider
CSB (pin 24)
SCK (pin 16)
SDI (pin 17)
SDO / LD (pin 20)
Serial Interface
Control
Multiplier
Cpout
(pin 12)
Post-R
Divider
Phase
Detector
Â¥
Charge
Pump
Sigma-Delta
Modulator
N Divider
Vtune
(pin 35)
Prescaler
Channel
Divider
MUX
MUX
Output
Buffer
RFoutAP
(pin 23)
Vcc
RFoutAM
(pin 22)
RFoutBM
(pin 19)
Vcc
RFoutBP
(pin 18)
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.