LMX2572 Datasheet, PDF (1/26 Pages) Texas Instruments – 6.4-GHz Low Power Wideband RF Synthesizer With Phase Synchronization and JESD204B Support

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LMX2572
SNAS740 – AUGUST 2017
LMX2572 6.4-GHz Low Power Wideband RF Synthesizer With Phase Synchronization and
JESD204B Support
1 Features
•1 Output Frequency: 13 MHz to 6.4 GHz
• Low Power Consumption: 75 mA at 3.3-V Supply
• –106-dBc/Hz Phase Noise at 100-kHz Offset With
6.4-GHz Carrier
• PLL Figure of Merit: –231 dBc/Hz
• PLL Normalized 1/f Noise: –124 dBc/Hz
• 32-Bit Fractional-N Divider
• Remove Integer Boundary Spurs With
Programmable Input Multiplier
• Synchronization of Output Phase Across Multiple
Devices
• Support for JESD204B SYSREF With
Programmable Delay
• Support for Ramp and Chirp Functions
• Support for FSK Direct Digital Modulation
• Two Programmable Output Power Level
Differential Outputs
• Fast VCO Calibration Speed: < 20 µs
• Single 3-V to 3.5-V Power Supply
2 Applications
• Test and Measurement Equipment
• Digital 2-Way Radios
• Low Power Radio Communication Systems
• Satellite Communication
• Wireless Microphones
• Propriety Wireless Connectivity
• MIMO
• RADAR
• High-Speed Data Converter Clocking
3 Description
The LMX2572 is a low-power, high-performance
wideband synthesizer that can generate any
frequency from 13 MHz to 6.4 GHz without using an
internal doubler. The PLL delivers excellent
performance while consuming just 75 mA from a
single 3.3-V supply.
For applications like digital mobile radio (DMR) and
wireless microphones, the LMX2572 supports FSK
modulation. The serial interface can be configured as
a SPI or I2S interface for this purpose. Discrete level
FSK and pulse-shaping FSK are supported. Direct
digital FSK modulation is achievable through
programming or pins.
The LMX2572 allows users to synchronize the output
of multiple devices and also enables applications that
need deterministic delay between input and output.
An option is provided to adjust the phase with fine
granularity to account for delay mismatch on the
board or within devices. A frequency ramp generator
can synthesize up to 2 segments of ramp in an
automatic ramp generation option or a manual option
for maximum flexibility. The fast calibration algorithm
allows changing frequencies faster than 20 µs. The
LMX2572 also supports generating or repeating
SYSREF (compliant to JESD204B standard) making
it an ideal low-power, low-noise clock source for
clocking high-speed data converters. Fine delay
adjustment is provided in this configuration to account
for delay differences of board traces.
The LMX2572 integrates LDOs from a single 3.3-V
supply, thus eliminating the need for onboard low-
noise LDOs.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMX2572
VQFN (40)
6.00 mm × 6.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
CPout
Vtune
OSCinP
OSCinM
CSB
SCK
SDI
MUXout
x2
Serial
Interface
Lock Detect or
Register Readback
Pre-R
Divider
MULT
Phase
Sync
Enable
Post-R
,
Charge
Divider
Pump
N-Divider
÷2/4/8«/256
Ramp Generator
FSK Generator
û
Modulator
SYSREF
RFoutAP
RFoutAM
RFoutBP
RFoutBM
SYNC
CE
RampClk
RampDir
SysRefReq
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. ADVANCE INFORMATION for pre-production products; subject to
change without notice.