VCO

VREG

Charge

Pump

Fast

Lock

1

R

Divider

Serial Interface

Control

DATA

CLK

LE

CE

PLL

VREG1

VregVCO

VrefVCO

OSCin

OSCin*

Fout

Vtune

CPout

FLout

Ftest/ LD

DIG

VREG

PLL

VREG2

Prescaler

N

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LMX2531

SNAS252S – OCTOBER 2005 – REVISED DECEMBER 2014

LMX2531 High-Performance Frequency Synthesizer System With Integrated VCO

1 Features

3 Description

The LMX2531 is a low-power, high-performance

1

•

Multiple Frequency Options Available

frequency synthesizer system which includes a fully

–

See Device Information Table

integrated delta-sigma PLL and VCO with fully

–

Frequencies From: 553 MHz to 3132 MHz

integrated tank circuit. The third and fourth poles are

also integrated and adjustable. Ultra-low noise and

•

PLL Features

high-precision LDOs are integrated for the PLL and

–

Fractional-N Delta-Sigma Modulator Order

VCO, which yield higher supply-noise immunity and

Programmable up to Fourth Order

more consistent performance. When combined with a

–

FastLock/Cycle Slip Reduction with Timeout

high-quality reference oscillator, the LMX2531 device

Counter

generates

very

stable,

low-noise

local-oscillator

signals for up and down conversion in wireless

–

Partially Integrated, Adjustable Loop Filter

communication devices. The LMX2531 device is a

–

Very Low Phase Noise and Spurs

monolithic

integrated

circuit,

fabricated

in

an

•

VCO Features

advanced

BiCMOS

process.

Several

different

versions

of

this

product

accommodate

different

–

Integrated Tank Inductor

frequency bands.

–

Low Phase Noise

•

Other Features

Device Information(1)

–

2.8-V to 3.2-V Operation

PART

LOW BAND

HIGH BAND

LMX2531LQ1146E

553 — 592 MHz

1106 — 1184 MHz

–

Low Operating Current

LMX2531LQ1226E

592 — 634 MHz

1184 — 1268 MHz

–

Low Power-Down Current

LMX2531LQ1312E

634 — 680 MHz

1268 — 1360 MHz

–

1.8-V MICROWIRE Support

LMX2531LQ1415E

680 — 735 MHz

1360 — 1470 MHz

–

36-Pin 6-mm × 6-mm × 0.8-mm WQFN

LMX2531LQ1500E

749.5 — 755 MHz

1499 — 1510 MHz

Package

LMX2531LQ1515E

725 — 790 MHz

1450 — 1580 MHz

LMX2531LQ1570E

765 — 818 MHz

1530 — 1636 MHz

2 Applications

LMX2531LQ1650E

795 — 850 MHz

1590 — 1700 MHz

•

Cellular Base Stations

LMX2531LQ1700E

831 — 885 MHz

1662 — 1770 MHz

•

Wireless LANs

LMX2531LQ1742

880 — 933 MHz

1760 — 1866 MHz

•

Broadband Wireless Access

LMX2531LQ1778E

863 — 920 MHz

1726 — 1840 MHz

•

Satellite Communications

LMX2531LQ1910E

917 — 1014 MHz

1834 — 2028 MHz

•

Wireless Radios

LMX2531LQ2080E

952 — 1137 MHz

1904 — 2274 MHz

•

Automotive

LMX2531LQ2265E

1089 — 1200 MHz

2178 — 2400 MHz

•

CATV Equipment

LMX2531LQ2570E

1168 — 1395 MHz

2336 — 2790 MHz

•

Instrumentation and Test Equipment

LMX2531LQ2820E

1355 — 1462 MHz

2710 — 2925 MHz

•

RFID Readers

LMX2531LQ3010E

1455 — 1566 MHz

2910 — 3132 MHz

•

Data Converter Clocking

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

the end of the datasheet.

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.