Specification	LMX2485QSQ/NOPB

Differential - Input:Output	Yes/No
Frequency - Max [Max]	3.1 GHz
Grade	Automotive
Input	Clock
Mounting Type	Surface Mount
Number of Circuits	1
Operating Temperature [Max]	105 ░C
Operating Temperature [Min]	-40 °C
Output	Clock
Package / Case	24-WFQFN Exposed Pad
PLL	True
Qualification	AEC-Q100
Ratio - Input:Output	3:2
Supplier Device Package	24-WQFN (4x4)
Type	Frequency Synthesizer (RF)
Voltage - Supply [Max]	3.6 V
Voltage - Supply [Min]	2.5 V

LMX2485Q-Q1 Series

500-MHz to 3-GHz delta-sigma low power dual PLL for RF personal communications

Part	Number of Circuits	Output	Type	Voltage - Supply [Max]	Voltage - Supply [Min]	Input	Ratio - Input:Output	Frequency - Max [Max]	Operating Temperature [Max]	Operating Temperature [Min]	Differential - Input:Output	Supplier Device Package	Package / Case	Mounting Type	Grade	Qualification
Texas Instruments LMX2485ESQX/NOPB	1	Clock	Frequency Synthesizer (RF)	3.6 V	2.5 V	Clock	3:2	3 GHz	85 °C	-40 °C	Yes/No	24-WQFN (4x4)	24-WFQFN Exposed Pad	Surface Mount
Texas Instruments LMX2485SQX/NOPB	1	Clock	Frequency Synthesizer (RF)	3.6 V	2.5 V	Clock	3:2	3 GHz	85 °C	-40 °C	Yes/No	24-WQFN (4x4)	24-WFQFN Exposed Pad	Surface Mount
Texas Instruments LMX2485ESQ/NOPB	1	Clock	Frequency Synthesizer (RF)	3.6 V	2.5 V	Clock	3:2	3 GHz	85 °C	-40 °C	Yes/No	24-WQFN (4x4)	24-WFQFN Exposed Pad	Surface Mount
Texas Instruments LMX2485SQ/NOPB	1	Clock	Frequency Synthesizer (RF)	3.6 V	2.5 V	Clock	3:2	3 GHz	85 °C	-40 °C	Yes/No	24-WQFN (4x4)	24-WFQFN Exposed Pad	Surface Mount
Texas Instruments LMX2485QSQ/NOPB	1	Clock	Frequency Synthesizer (RF)	3.6 V	2.5 V	Clock	3:2	3.1 GHz	105 ░C	-40 °C	Yes/No	24-WQFN (4x4)	24-WFQFN Exposed Pad	Surface Mount	Automotive	AEC-Q100
Texas Instruments LMX2485QSQX/NOPB	1	Clock	Frequency Synthesizer (RF)	3.6 V	2.5 V	Clock	3:2	3.1 GHz	105 ░C	-40 °C	Yes/No	24-WQFN (4x4)	24-WFQFN Exposed Pad	Surface Mount	Automotive	AEC-Q100

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 7.30
	Digi-Reel®	1	$ 7.30
	Tape & Reel (TR)	1000	$ 4.14
		2000	$ 3.99
Texas Instruments	SMALL T&R	1	$ 5.59
		100	$ 4.55
		250	$ 3.58
		1000	$ 3.04

Description

General part information

LMX2485Q-Q1 Series

The LMX2485Q-Q1 is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. The device is fabricated using TI’s advanced process.

With delta-sigma architecture, fractional spurs at lower offset frequencies are pushed to higher frequencies outside the loop bandwidth. The ability to push close in spur and phase noise energy to higher frequencies is a direct function of the modulator order. Unlike analog compensation, the digital feedback technique used in the LMX2485Q-Q1 is highly resistant to changes in temperature and variations in wafer processing. The LMX2485Q-Q1 delta-sigma modulator is programmable up to fourth order, which allows the designer to select the optimum modulator order to fit the phase noise, spur, and lock time requirements of the system.

Serial data for programming the LMX2485Q-Q1 is transferred through a three-line, high-speed (20-MHz) MICROWIRE interface. The LMX2485Q-Q1 offers fine frequency resolution, low spurs, fast programming speed, and a single word write to change the frequency. This makes it ideal for direct digital modulation applications, where the N-counter is directly modulated with information. The LMX2485Q-Q1 is available in a 24-lead 4.0 × 4.0 × 0.8 mm WQFN package.

Documents

Technical documentation and resources

LMX248x Evaluation Board User's Guide (Rev. B)

EVM User's guide

AN-1879 Fractional N Frequency Synthesis (Rev. B)

Application note

LMX2485Q-Q1 500 MHz - 3.1 GHz High Performance Delta-Sigma Low Power Dual PLLatinum Frequency Synthesizers With 800-MHz Integer PLL datasheet (Rev. A)

Data sheet