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LMX2470SLEX Datasheet

  • LMX2470SLEX

  • 2.6 GHz Delta-Sigma Fractional-N PLL with 800 MHz Integer-N ...

  • 449.56KB

  • 36頁

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LMX2470 2.6 GHz Delta-Sigma Fractional-N PLL with 800 MHz Integer-N PLL
April 2003
LMX2470
2.6 GHz Delta-Sigma Fractional-N PLL with 800 MHz
Integer-N PLL
General Description
The LMX2470 is a low power, high performance delta-sigma
fractional-N PLL with an auxiliary integer-N PLL. The device
is fabricated using National Semiconductor鈥檚 advanced BiC-
MOS process.
With delta-sigma architecture, fractional spur compensation
is achieved with noise shaping capability of the delta-sigma
modulator and the inherent low pass filtering of the PLL loop
filter. Fractional spurs at lower frequencies are pushed to
higher frequencies outside the loop bandwidth. Unlike ana-
log compensation, the digital feedback techniques used in
the LMX2470 are highly resistant to changes in temperature
and variations in wafer processing. With delta-sigma archi-
tecture, the ability to push close in spur and phase noise
energy to higher frequencies is a direct function of the modu-
lator order. The higher the order, the more this energy can be
spread to higher frequencies. The LMX2470 has a program-
mable modulator up to order four, which allows the designer
to select the optimum modulator order to fit the phase noise,
spur, and lock time requirements of the system.
Programming is fast and simple. Serial data is transferred
into the LMX2470 via a three line MICROWIRE interface
(Data, Clock, Load Enable). Nominal supply voltage is 2.5 V.
The LMX2470 features a typical current consumption of 4.1
mA at 2.5 V. The LMX2470 is available in a 24 lead 3.5 X 4.5
X 0.6 mm package.
Features
n
n
n
n
Low in-band phase noise and low fractional spurs
12 bit or 22 bit selectable fractional modulus
Up to 4th order programmable delta-sigma modulator
Enhanced Anti-Cycle Slip Fastlock Circuitry
Fastlock
Cycle slip reduction
Integrated timeout counters
Digital lock detect output
Prescalers allow wide range of N values
RF PLL: 16/17/20/21
IF PLL: 8/9 or 16/17
Crystal Reference Frequency up to 110 MHz
On-chip crystal reference frequency doubler.
Phase Comparison Frequency up to 30 MHz
Hardware and software power-down control
Ultra low consumption: I
CC
= 4.1 mA (typical)
n
n
n
n
n
n
n
Applications
n
Cellular Phones and Base Stations
CDMA, WCDMA, GSM/GPRS, TDMA, EDGE, PDC
n
Applications requiring fine frequency resolution
n
Satellite and Cable TV Tuners
n
WLAN Standards
Functional Block Diagram
20059301
漏 2003 National Semiconductor Corporation
DS200593
www.national.com

LMX2470SLEX 產(chǎn)品屬性

  • 1

  • 集成電路 (IC)

  • 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器

  • -

  • PLL 頻率合成器，三角積分型

  • 帶旁路

  • CMOS

  • CMOS

  • 1

  • 3:3

  • 是/無

  • 2.6GHz

  • 是/是

  • 2.25 V ~ 2.75 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 24-UFQFN，CSP

  • 24-UCSP（3.5x4.5）

  • Digi-Reel®

  • LMX2470EVAL-ND - EVALUATION BOARD FOR LMX2470

  • LMX2470SLEXDKR

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