Datasheet > LMX2486

LMX2486

更新时间： 2024-11-21 03:54:15

品牌	Logo	应用领域
美国国家半导体 - NSC		半导体
页数	文件大小	规格书
37页	871K
描述
1.0 GHz - 4.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum TM Frequency Synthesizers with 3.0 GHz Integer PLL

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LMX2486 数据手册

January 2006

LMX2486

1.0 GHz - 4.5 GHz High Performance Delta-Sigma Low

™

Power Dual PLLatinum Frequency Synthesizers with

3.0 GHz Integer PLL

n Direct digital modulation applications

General Description

n Satellite and cable TV tuners

The LMX2486 is a low power, high performance delta-sigma

n WLAN Standards

fractional-N PLL with an auxiliary integer-N PLL. The device

is fabricated using National Semiconductor’s advanced pro-

cess.

Features

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 LMX2486 is highly resistant

to changes in temperature and variations in wafer process-

ing. The LMX2486 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.

Quadruple Modulus Prescalers for Lower Divide Ratios

n RF PLL: 16/17/20/21 or 32/33/36/37

n IF PLL: 8/9 or 16/17

Advanced Delta Sigma Fractional Compensation

n 12 bit or 22 bit selectable fractional modulus

n Up to 4th order programmable delta-sigma modulator

Features for Improved Lock Times and Programming

n Fastlock / Cycle slip reduction

n Integrated time-out counter

n Single word write to change frequencies with Fastlock

Serial data for programming the LMX2486 is transferred via

a three line high speed (20 MHz) MICROWIRE interface.

The LMX2486 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 modula-

tion applications, where the N counter is directly modulated

with information. The LMX2486 is available in a 24 lead

4.0 X 4.0 X 0.8 mm LLP package.

Wide Operating Range

n LMX2486 RF PLL: 1.0 GHz to 4.5 GHz

Useful Features

n Digital lock detect output

n Hardware and software power-down control

n On-chip crystal reference frequency doubler.

n RF phase comparison frequency up to 50 MHz

n 2.5 to 3.6 volt operation with I_CC= 8.5 mA at 3.0 V

Applications

n Cellular phones and base stations

CDMA, WCDMA, GSM/GPRS, TDMA, EDGE, PDC

Functional Block Diagram

20156901

™

PLLatinum is a trademark of National Semiconductor Corporation.

DS201569

www.national.com

12 3 4 5 6 7...37

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与LMX2486相关器件

型号	品牌	获取价格	描述	数据表
LMX2486SQ	NSC	获取价格	IC PLL FREQUENCY SYNTHESIZER, 4500 MHz, PQCC24, 4 X 4 MM, 0.8 MM HEIGHT, PLASTIC, LLP-24,
LMX2486SQ/NOPB	TI	获取价格	用于射频个人通信的 1GHz 至 4.5GHz Δ-Σ 低功耗双路 PLL \| RTW \|
LMX2487	NSC	获取价格	1.0 GHz - 6.0 GHz High Performance Delta-Sigm
LMX2487	TI	获取价格	Low-Power Dual PLLatinum Frequency Synthesizers
LMX2487_08	NSC	获取价格	1.0 GHz - 6.0 GHz High Performance Delta-Sigm
LMX2487E	NSC	获取价格	7.5 GHz High Performance Delta-Sigma Low Powe
LMX2487E	TI	获取价格	用于射频个人通信的 3GHz 至 7.5GHz Δ-Σ 低功耗双路 PLL
LMX2487ESQ	NSC	获取价格	7.5 GHz High Performance Delta-Sigma Low Powe
LMX2487ESQ/NOPB	TI	获取价格	用于射频个人通信的 3GHz 至 7.5GHz Δ-Σ 低功耗双路 PLL \| RTW \|
LMX2487ESQE/NOPB	TI	获取价格	Delta-Sigma Low Power Dual PLL for RF Personal Communications 24-WQFN -40 to 85

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