LMX2541SQ2060E, LMX2541SQ2380E
LMX2541SQ2690E, LMX2541SQ3030E
LMX2541SQ3320E, LMX2541SQ3740E
www.ti.com
SNOSB31I –JULY 2009–REVISED FEBRUARY 2013
LMX2541 Ultra-Low Noise PLLatinum Frequency Synthesizer with Integrated VCO
Check for
Samples: LMX2541SQ2060E, LMX2541SQ2380E, LMX2541SQ2690E, LMX2541SQ3030E, LMX2541SQ3320E, LMX2541SQ3740E
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FEATURES
DESCRIPTION
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Very Low RMS Noise and Spurs
The LMX2541 is an ultra low noise frequency
synthesizer which integrates a high performance
delta-sigma fractional N PLL, a VCO with fully
integrated tank circuit, and an optional frequency
divider. The PLL offers an unprecedented normalized
noise floor of -225 dBc/Hz and can be operated with
up to 104 MHz of phase-detector rate (comparison
frequency) in both integer and fractional modes. The
PLL can also be configured to work with an external
VCO.
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-225 dBc/Hz Normalized PLL Phase Noise
Integrated RMS Noise (100 Hz - 20 MHz)
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2 mrad (100 Hz - 20 MHz) at 2.1 GHz
3.5 mrad (100 Hz - 20 MHz) at 3.5 GHz
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Ultra Low-Noise Integrated VCO
External VCO Option (Internal VCO Bypassed)
VCO Frequency Divider 1 to 63 (all values)
Programmable Output Power
The LMX2541 integrates several low-noise, high
precision LDOs and output driver matching network to
provide higher supply noise immunity and more
consistent performance, while reducing the number of
external components. When combined with a high
quality reference oscillator, the LMX2541 generates a
very stable, ultra low noise signal.
Up to 104 MHz Phase Detector Frequency
Integrated Low-Noise LDOs
Programmable Charge Pump Output
Partially Integrated Loop Filter
Digital Frequency Shift Keying (FSK)
Modulation Pin
The LMX2541 is offered in a family of 6 devices with
varying VCO frequency range from 1990 MHz up to 4
GHz. Using a flexible divider, the LMX2541 can
generate frequencies as low as 31.6 MHz. The
LMX2541 is a monolithic integrated circuit, fabricated
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Integrated Reference Crystal Oscillator Circuit
Hardware and Software Power Down
FastLock Mode and VCO-Based Cycle Slip
Reduction
in
a
proprietary BiCMOS process. Device
three-wire
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Analog and Digital Lock Detect
1.6 V Logic Compatibility
programming is facilitated using
a
MICROWIRE interface that can operate down to 1.6
volts. Supply voltage ranges from 3.15 to 3.45 volts.
The LMX2541 is available in a 36 pin 6x6x0.8 mm
WQFN Package.
TARGET APPLICATIONS
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Wireless Infrastructure (UMTS, LTE, WiMax)
Broadband Wireless
Wireless Meter Reading
Test and Measurement
Device
VCO Frequency
1990 - 2240
2200 - 2530
2490 - 2865
2810 - 3230
3130 - 3600
3480 - 4000
LMX2541SQ2060E
LMX2541SQ2380E
LMX2541SQ2690E
LMX2541SQ3030E
LMX2541SQ3320E
LMX2541SQ3740E
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