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LMX2582 High Performance, Wideband PLLatinum™ RF Synthesizer With Integrated

VCO

1 Features

•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

•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 and Measurement Equipment

•Cellular Base-Station

•Microwave Backhaul

•High-Performance Clock Source for High-Speed

Data Converters

•Software Defined Radio

3 Description

The LMX2582 device 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 µs.

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.

Package Information

(1)

PART NUMBERDESCRIPTIONBODY SIZE (NOM)

LMX2582RHAT

LMX2582RHAR

VQFN (40)6.00 mm × 6.00 mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet.

Charge

Pump

Vtune

(pin 35)

Cpout

(pin 12)

RFoutAP

Sigma-Delta

Modulator

N Divider

OSCin

Douber

Post-R

Divider

Multiplier

Pre-R

Divider

ϕ

Vcc

RFoutAM

RFoutBP

Vcc

Prescaler

Channel

Divider

External Loop Filter

Phase

Detector

Output

Buffer

OSCin

Buffer

Serial Interface

Control

SDI (pin 17)

SCK (pin 16)

CSB (pin 24)

SDO / LD (pin 20)

OSCinP

(pin 8)

OSCinM

(pin 9)

Input

Signal

RFoutBM

MUX

MUX

Simplified Schematic

LMX2582

SNAS680E – DECEMBER 2015 – REVISED AUGUST 2022

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.

Produktspecifikationer