LMX24xx RF PLL Family
Low noise and low power fractional-N PLLs
The LMX24xx family of PLLatinum™ RF PLLs offer a wide choice of products to meet the
low noise and low power needs of applications like mobile wireless, compact RF, radar
modules, microwave backhaul, oscilloscopes, spectrum analyzers, land mobile radios,
software defined radios and automotive radar. The LMX2492 offers excellent noise figureof-merit (FOM) of -227dBc/Hz and can connect to an external VCO up to 14GHz making it
ideal for high frequency, high performance applications. The LMX2485E offers a dual PLL
at a very low current consumption of 5mA for low power, hand-held applications.
PLL
LMX2492-Q1 Automotive Radar
VCO
Reference
LPF
LMX2492-Q1
5V charge pump output
Flexible ramp generation
Tx
÷N
Input up to 14 GHz
SPI
Rx
Trigger
DSP
ADC
PLL family
Device
Output Freq
Range
(MHz)
Normalized
PLL Noise
(dBc/Hz)
Analog Supply
(VCC) (V)
Charge Pump
Supply
(VCP) (V)
Total Supply
Current
(mA)
RF Supply
Current
(mA)
IF Supply
Current
(mA)
LMX2492
500 to 14000
-227
3.15 to 3.45
3.15 to 5.25
60
60
N/A
QFN-24
LMX2485
500 to 3000
LMX2485E
50 to 3000
-210
2.5 to 3.6
2.5 to 3.6
5
3.3
1.7
QFN-24
LMX2486
1000 to 4500
-210
2.5 to 3.6
2.5 to 3.6
8.5
5.7
2.5
QFN-24
LMX2487
1000 to 6000
LMX2487E
3000 to 7500
-210
2.5 to 3.6
2.5 to 3.6
8.5
5.7
2.5
QFN-24
LMX2430
250 to 3000
-218
2.25 to 2.75
2.25 to 2.75
4.2
2.8
1.4
TSSOP-20, ULGA-20
LMX2433
500 to 3600
-218
2.25 to 2.75
2.25 to 2.75
5.2
3.2
2
TSSOP-20, ULGA-20
LMX2434
1000 to 5000
-218
2.25 to 2.75
2.25 to 2.75
7
4.6
2.4
TSSOP-20, ULGA-20
Package
Automotive-qualified PLL family
Output Freq Range
(MHz)
Normalized
PLL Noise
(dBc/Hz)
Analog Supply
(VCC) (V)
Charge Pump
Supply
(VCP) (V)
Total Supply
Current
(mA)
RF Supply
Current
(mA)
IF Supply
Current
(mA)
Package
LMX2492-Q1
500 to 14000
-227
3.15 to 3.45
3.15 to 5.25
60
60
N/A
QFN-24
LMX2485-Q1
500 to 3100
-216
2.5 to 3.6
2.5 to 3.6
5
3.3
1.7
QFN-24
Device
New products are listed in bold red
RF PLL and Synthesizer Solutions
4
Texas Instruments
2016
LMX25xx RF Synthesizer Family
Low power and high performance fractional-N synthesizers (PLL with integrated VCO)
The LMX25xx family of RF synthesizers integrates low noise VCOs along with low noise PLLs.
The low power LMX2531 and LMX2571 enables energy efficient and mobile solutions, while
still having best-in-class performance to meet industry standards. The high performance
LMX2541, LMX2581, LMX2582, and LMX2592 covers up to 9.8GHz at the best noise figures
in the industry to enable high performance solutions.
PLL
LMX2571 for land mobile / 2-way radio with built-in FSK
OSCin
LDO
LMX2571
Tx
DC/DC
PLL
T/R
PA
T/R
PMU
FSK Modulator
Rx LO
Serial Interface for
FSK/FM Modulation
DATA, CLK, LE, CE
Demodulator
T/R
USB
DSP
Amp
SPK
Audio
CODEC
Mic
LMX2581 Zero IF Receiver
LPF
ADC
Digital
LPF
ADC
90
LMX2581E
Reference
LMX2581E
High performance synthesizer family with integrated VCO
Output
Frequency(Min)
(MHz)
Output
Frequency(Max)
(MHz)
VCO Phase Noise
Normalized to
1GHz @ 100kHz
Offset (dBc/Hz)
Normalized PLL
Phase Noise
(dBc/Hz)
1/f Noise (10 kHz offset at 1 GHz carrier)
(dBc/Hz)
Current
Consumption (mA)
PFD frequency
(MHz)
LMX2592
20
9800
-129
-231
-126
250
200
LMX2582
20
5500
-129
-231
-126
250
200
LMX2571
10
1344
-115
-231
-124
39
130
LMX2581E
50
3800
-121
-229
-121
178
200
LMX2541
32
4000
-120
-226
-125
120
104
LMX2531
553
3132
-126
-212
-104
34
32
LMX2522
1619.62
1649.62
-117
17
LMX2512
954.42
1077.57
-117
17
Device
RF PLL and Synthesizer Solutions
5
Texas Instruments
2016