LMX2541 Series

Ultra-low noise PLLatinum frequency synthesizer with integrated VCO

Catalog

Ultra-low noise PLLatinum frequency synthesizer with integrated VCO

Part	Mounting Type	Number of Circuits	Frequency - Max [Max]	Type	Output	Voltage - Supply [Max]	Voltage - Supply [Min]	Ratio - Input:Output [custom]	Package / Case	Operating Temperature [Max]	Operating Temperature [Min]	Input	Divider/Multiplier	Supplier Device Package	Utilized IC / Part	Supplied Contents	Function
Texas Instruments LMX2541SQE3320E/NOPB	Surface Mount	1	3.6 GHz	Frequency Synthesizer (RF)	Clock	3.45 V	3.15 V	2:2	36-WFQFN Exposed Pad	85 °C	-40 °C	Clock	Yes/No	36-WQFN (6x6)
Texas Instruments LMX2541SQX2380E/NOPB	Surface Mount	1		Frequency Synthesizer (RF)	Clock	3.45 V	3.15 V	2:2	36-WFQFN Exposed Pad	85 °C	-40 °C	Clock	Yes/No	36-WQFN (6x6)
Texas Instruments LMX2541SQE2060E/NOPB	Surface Mount	1	2.24 GHz	Frequency Synthesizer (RF)	Clock	3.45 V	3.15 V	2:2	36-WFQFN Exposed Pad	85 °C	-40 °C	Clock	Yes/No	36-WQFN (6x6)
Texas Instruments LMX2541SQX2690E/NOPB	Surface Mount	1	2.865 GHz	Frequency Synthesizer (RF)	Clock	3.45 V	3.15 V	2:2	36-WFQFN Exposed Pad	85 °C	-40 °C	Clock	Yes/No	36-WQFN (6x6)
Texas Instruments LMX2541SQX3030E/NOPB	Surface Mount	1	3.23 GHz	Frequency Synthesizer (RF)	Clock	3.45 V	3.15 V	2:2	36-WFQFN Exposed Pad	85 °C	-40 °C	Clock	Yes/No	36-WQFN (6x6)
Texas Instruments LMX2541SQ3030E/NOPB	Surface Mount	1	3.23 GHz	Frequency Synthesizer (RF)	Clock	3.45 V	3.15 V	2:2	36-WFQFN Exposed Pad	85 °C	-40 °C	Clock		36-WQFN (6x6)
Texas Instruments LMX2541SQE2690E/NOPB	Surface Mount	1	2.865 GHz	Frequency Synthesizer (RF)	Clock	3.45 V	3.15 V	2:2	36-WFQFN Exposed Pad	85 °C	-40 °C	Clock	Yes/No	36-WQFN (6x6)
Texas Instruments LMX2541SQX3740E/NOPB	Surface Mount	1	4 GHz	Frequency Synthesizer (RF)	Clock	3.45 V	3.15 V	2:2	36-WFQFN Exposed Pad	85 °C	-40 °C	Clock	Yes/No	36-WQFN (6x6)
Texas Instruments LMX25412060EVAL/NOPB				Timing											LMX25412060	Board(s)	Frequency Synthesizer
Texas Instruments LMX2541SQ3740E/NOPB	Surface Mount	1	4 GHz	Frequency Synthesizer (RF)	Clock	3.45 V	3.15 V	2:2	36-WFQFN Exposed Pad	85 °C	-40 °C	Clock		36-WQFN (6x6)

Catalog

Ultra-low noise PLLatinum frequency synthesizer with integrated VCO

Key Features

• Multiple Frequency Options Available(SeeDevice Comparison Table)Frequencies from 31.6 MHz to 4000 MHzVery Low RMS Noise and Spurs–225 dBc/Hz Normalized PLL Phase NoiseIntegrated RMS Noise (100 Hz – 20 MHz)2 mRad (100 Hz – 20 MHz) at 2.1 GHz3.5 mRad (100 Hz - 20 MHz) at 3.5 GHzUltra Low-Noise Integrated VCOExternal VCO Option (Internal VCO Bypassed)VCO Frequency Divider 1 to 63 (all values)Programmable Output PowerUp to 104-MHz Phase Detector FrequencyIntegrated Low-Noise LDOsProgrammable Charge Pump OutputPartially Integrated Loop FilterDigital Frequency Shift Keying (FSK) Modulation PinIntegrated Reference Crystal Oscillator CircuitHardware and Software Power DownFastLock Mode and VCO-Based Cycle Slip ReductionAnalog and Digital Lock Detect1.6-V Logic CompatibilityMultiple Frequency Options Available(SeeDevice Comparison Table)Frequencies from 31.6 MHz to 4000 MHzVery Low RMS Noise and Spurs–225 dBc/Hz Normalized PLL Phase NoiseIntegrated RMS Noise (100 Hz – 20 MHz)2 mRad (100 Hz – 20 MHz) at 2.1 GHz3.5 mRad (100 Hz - 20 MHz) at 3.5 GHzUltra Low-Noise Integrated VCOExternal VCO Option (Internal VCO Bypassed)VCO Frequency Divider 1 to 63 (all values)Programmable Output PowerUp to 104-MHz Phase Detector FrequencyIntegrated Low-Noise LDOsProgrammable Charge Pump OutputPartially Integrated Loop FilterDigital Frequency Shift Keying (FSK) Modulation PinIntegrated Reference Crystal Oscillator CircuitHardware and Software Power DownFastLock Mode and VCO-Based Cycle Slip ReductionAnalog and Digital Lock Detect1.6-V Logic Compatibility

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 V to 3.45 V. The LMX2541 is available in a 36-pin 6-mm × 6-mm × 0.8-mm WQFN Package. 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 V to 3.45 V. The LMX2541 is available in a 36-pin 6-mm × 6-mm × 0.8-mm WQFN Package.