LMX2541SQE2060E Datasheet, PDF (1/64 Pages) Texas Instruments – LMX2541 Ultra-Low Noise PLLatinum Frequency Synthesizer with Integrated VCO

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LMX2541SQ2060E, LMX2541SQ2380E
LMX2541SQ2690E, LMX2541SQ3030E
LMX2541SQ3320E, LMX2541SQ3740E
SNOSB31I – JULY 2009 – REVISED FEBRUARY 2013
LMX2541 Ultra-Low Noise PLLatinum Frequency Synthesizer with Integrated VCO
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Samples: LMX2541SQ2060E, LMX2541SQ2380E, LMX2541SQ2690E, LMX2541SQ3030E, LMX2541SQ3320E, LMX2541SQ3740E
FEATURES
1
•2 Very Low RMS Noise and Spurs
– -225 dBc/Hz Normalized PLL Phase Noise
– Integrated RMS Noise (100 Hz - 20 MHz)
– 2 mrad (100 Hz - 20 MHz) at 2.1 GHz
– 3.5 mrad (100 Hz - 20 MHz) at 3.5 GHz
• Ultra Low-Noise Integrated VCO
• External VCO Option (Internal VCO Bypassed)
• VCO Frequency Divider 1 to 63 (all values)
• Programmable Output Power
• 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
• Integrated Reference Crystal Oscillator Circuit
• Hardware and Software Power Down
• FastLock Mode and VCO-Based Cycle Slip
Reduction
• Analog and Digital Lock Detect
• 1.6 V Logic Compatibility
TARGET APPLICATIONS
• Wireless Infrastructure (UMTS, LTE, WiMax)
• Broadband Wireless
• Wireless Meter Reading
• Test and Measurement
DESCRIPTION
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.
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.
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
in a proprietary BiCMOS process. Device
programming is facilitated using a three-wire
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.
Device
LMX2541SQ2060E
LMX2541SQ2380E
LMX2541SQ2690E
LMX2541SQ3030E
LMX2541SQ3320E
LMX2541SQ3740E
VCO Frequency
1990 - 2240
2200 - 2530
2490 - 2865
2810 - 3230
3130 - 3600
3480 - 4000
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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