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See Technical Specifications

LMX2487SQ/NOPB

1 to 6-GHz delta-sigma low power dual PLLatinum frequency synthesizer with 3.0-GHz integer PLL

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

LMX2487SQ/NOPB
Datasheet:

LMX2487SQ/NOPB Datasheet (PDF)
Integrated VCO:

No
Output frequency (min) (MHz):

1000
Output frequency (max) (MHz):

6000
Normalized PLL phase noise (dBc/Hz):

-210
EDA/CAD Models:

Request Free CAD Models for LMX2487SQ/NOPB

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LMX2487SQ/NOPB General Description

The LMX2487 device is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. It 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 LMX2487 is highly resistant to changes in temperature and variations in wafer processing. The LMX2487 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 LMX2487 is transferred through a three-line, high-speed (20-MHz) MICROWIRE interface. The LMX2487 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 LMX2487 is available in a 24-lead 4.0 × 4.0 × 0.8 mm WQFN package.

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Key Features

Quadruple Modulus Prescaler for Lower Divides
- RF PLL: 16/17/20/21 or 32/33/36/37
- IF PLL: 8/9 or 16/17
Advanced Delta Sigma Fractional Compensation
- 12-Bit or 22-Bit Selectable Fractional Modulus
- Up to 4th Order Programmable Delta-Sigma
  Modulator
Improved Lock Times
- Fastlock / Cycle Slip Reduction With Single-
  Word Write to Change Frequencies
- Integrated Time-Out Counter
Wide Operating Range
- LMX2487 RF PLL: 1.0 GHz to 6.0 GHz
Useful Features
- Digital Lock Detect Output
- Hardware and Software Power-Down Control
- On-Chip Input Frequency Doubler
- RF Phase Comparison Detector Up to 50 MHz
- 2.5-V to 3.6-V Operation With I_CC = 8.5 mA

Specifications

Integrated VCO	No	Output frequency (min) (MHz)	1000
Output frequency (max) (MHz)	6000	Normalized PLL phase noise (dBc/Hz)	-210
Current consumption (mA)	5.7	Features	Advanced delta-sigma fractional compensation, Cycle slip reduction, Dual PLL, Fastlock, Integrated timeout counter, On-chip input frequency doubler
1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz)	-104	Rating	Catalog
Operating temperature range (°C)	-40 to 85	Lock time (µs) (typ)	Loop BW dependent
feature-maximum-operating-supply-voltage-v	3.6	feature-minimum-operating-supply-voltage-v	2.5
feature-packaging	Tape and Reel	feature-rad-hard
feature-pin-count	24	feature-cecc-qualified	No
feature-esd-protection	Yes	feature-escc-qualified
feature-military	No	feature-aec-qualified	No
feature-aec-qualified-number		feature-auto-motive	No
feature-p-pap	No	feature-eccn-code	5A991g.
feature-svhc	Yes	feature-svhc-exceeds-threshold	No