Texas Instruments LMX2571-EP Bedienungsanleitung

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LMX2571-EP Low-Power, High-Performance PLLatinum

™

RF Synthesizer

With FSK Modulation

1 Features

•VID#: V62/21613-01XE

•-55 °C to +125 °C Operating Temperature

•Any Frequency From 10 MHz to 1344 MHz

•Low Phase Noise and Spurs

––123 dBc/Hz at 12.5-kHz Offset at 480 MHz

––145 dBc/Hz at 1-MHz Offset at 480 MHz

–Normalized PLL Noise Floor of –231 dBc/Hz

–Spurious Better Than –75 dBc/Hz

•New FastLock to Reduce Lock Time

•A Novel Technique to Remove Integer Boundary

Spurs

•Integrated 5-V Charge Pump and Output Divider

for External VCO Operation

•2-, 4-, and 8-Level or Arbitrary Level Direct Digital

FSK Modulation

•One TX/RX Output or Two Fanout Outputs

•Low Current Consumption

–39-mA Typical Synthesizer Mode (Internal

VCO)

–9-mA Typical PLL Mode (External VCO)

•24-Bit Fractional-N Delta Sigma Modulator

•Functional Differences between LMX2571 vs

LMX2571-EP

–LMX2571-EP has no TrCtl Pin

–LMX2571-EP has no OSCin* pin, Differential

Mode, or Crystal Mode

2 Applications

•Seeker front end

•Defense radio

•Aircraft cockpit display

•Flight control unit

•Wireless infrastructure

3 Description

The LMX2571-EP device is a low-power, high-

performance, wideband PLLatinum

™

RF synthesizer

that integrates a delta-sigma fractional N PLL,

multiple core voltage-controlled oscillator (VCO),

programmable output dividers and two output buffers.

The VCO cores work up to 5.376 GHz resulting in

continuous output frequency range of 10 MHz to 1344

MHz.

This synthesizer can also be used with an external

VCO. To that end, a dedicated 5-V charge pump and

an output divider are available for this configuration.

A unique programmable multiplier is also incorporated

to help improve spurs, allowing the system to use

every channel even if it falls on an integer boundary.

The output has an integrated SPDT switch that can be

used as a transmit and receive switch in FDD radio

application. Both outputs can also be turned on to

provide 2 outputs at the same time.

The LMX2571-EP supports direct digital FSK

modulation through programming or pins. Discrete

level FSK, pulse shaping FSK, and analog FM

modulation are supported.

A new FastLock technique can be used allowing the

user to step from one frequency to the next in less

than 1.5 ms even when an external VCO is used with

a narrow band loop filter.

Device Information

(1)

PART NUMBERPACKAGEBODY SIZE (NOM)

LMX2571-EP

V62/21613-01XE

VQFN (36)6.00 mm × 6.00 mm

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

the end of the data sheet.

Fast

lock

Int. charge

pump

5-V charge

pump

R-divider

Phase

detector

µWIRE

Prescaler

N-divider

Output

divider

Output

divider



modulator

Transmit / Receive

RFoutRx

RFoutTx

Fin

CPout

CPoutExtFLout

OSCin

SPICEFSK

OP

MUX

VCO

MUX

CP

MUX

Power

supply

Lock

dect

MUXout

5-V CP

supply

Vcc3p3VccIO

VcpExt

Enable

Simplified Schematic

LMX2571-EP

SNAS824B – OCTOBER 2021 – REVISED JUNE 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.

Produktspezifikationen