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LMX2694-EP 15-GHz Wideband PLLatinum

™

RF Synthesizer With Phase

Synchronization

1 Features

•VID V62/19616-01XE

•39.3-MHz to 15.1-GHz output frequency

•–110 dBc/Hz phase noise at 100-kHz offset with

15-GHz carrier

•54-fs RMS jitter at 8 GHz (100 Hz to 100 MHz)

•Programmable output power

•PLL key specifications

–Figure of merit: –236 dBc/Hz

–Normalized 1/f noise: –129 dBc/Hz

–Up to 200-MHz phase detector frequency

•Synchronization of output phase across multiple

devices

•Support for SYSREF with 9-ps resolution

programmable delay

•3.3-V single power supply operation

•Operating temperature range: –55°C to 125°C

2 Applications

•Defense radio

•Electronic warfare

•Radar

•Active antenna system mMIMO (AAS)

•Macro remote radio unit

•Outdoor backhaul unit

•Data acquisition

•Wireless communications test equipment

3 Description

The LMX2694-EP device is a high-performance,

wideband phase-locked loop (PLL) with an integrated

voltage-controlled oscillator (VCO) and voltage

regulators that can output any frequency between

39.3 MHz and 15.1 GHz without a doubler, eliminating

the need for ½ harmonic filters. The VCO on this

device covers an entire octave to complete the

frequency coverage down to 39.3 MHz. The high-

performance PLL, with a –236-dBc/Hz figure of merit

and high-phase detector frequency, can achieve very

low in-band noise and integrated jitter.

The LMX2694-EP allows designers to synchronize

the output of multiple instances of the device. This

means that deterministic phase can be obtained

from a device in any use case, including one with

the fractional engine or output divider enabled. The

device also allows designers to generate or repeat

SYSREF (compliant to JESD204B standard) to use

the device as a low-noise clock source for high-speed

data converters.

Device Information

(1)

PART NUMBERPACKAGEBODY SIZE (NOM)

LMX2694-EPVQFN (48)7.00 mm × 7.00 mm

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

the end of the data sheet.

Charge

Pump

VTUNECPOUT

RFOUTA_P

Sigma-Delta

Modulator

N Divider

OSCIN

Doubler

Post-R

Divider

Pre-R

Divider

I

Vcc

RFOUTA_N

RFOUTB_N

Phase

Detector

Output

Buffers

OSCIN

Buffer

Serial Interface

Control

SDI

SCK

CS#

MUXOUT

OSCIN_P

OSCIN_N

Input

signal

RFOUTB_P

MUX

SYSREF

Synchronization

and Delay

Channel

Divider

MUX

External loop

filter

Vcc

Simplified Schematic

LMX2694-EP

SNAS785D – NOVEMBER 2019 – REVISED MARCH 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