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LMX2370TMX Datasheet

  • LMX2370TMX

  • PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Commu...

  • 16頁

  • NSC

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LMX2370/LMX2371/LMX2372 PLLatinum Dual Frequency Synthesizer for RF Personal
Communications
PRELIMINARY
March 1999
LMX2370/LMX2371/LMX2372
PLLatinum
鈩?/div>
Dual Frequency Synthesizer for RF
Personal Communications
LMX2370
LMX2371
LMX2372
2.5 GHz/1.2 GHz
2.0 GHz/1.2 GHz
1.2 GHz/1.2 GHz
The LMX237X are available in a 24-pad chip scale (CSP) or
a 20-pin TSSOP surface mount plastic package.
Features
n
n
n
n
n
2.7V鈥?.5V operation
Ultra low current consumption
Low phase detector noise floor
Low voltage MICROWIRE
鈩?/div>
interface (1.8V up to V
CC
)
Low prescaler values
32/33
@
f
IN
鈮?/div>
2.5 GHz
16/17
@
f
IN
鈮?/div>
1.2 GHz
8/9
@
f
IN
鈮?/div>
550 MHz
Selectable charge pump current levels
Selectable FastLock
鈩?/div>
mode
Enhanced ESD protection
Small 24 pad chip scale package (3.5 x 4.5 x 1.0 mm)
General Description
The LMX237X family of monolithic, integrated dual fre-
quency synthesizers, including prescalers, is designed to be
used as a first and second local oscillator for dual mode or
dual conversion transceivers. It is fabricated using National鈥檚
0.5u ABiCV silicon BiCMOS process. The LMX237X con-
tains two dual modulus prescalers. A 32/33 or a 16/17
prescaler can be selected for the 2.5 GHz and 2.0 GHz RF
synthesizers with the 16/17 prescaler rated for input frequen-
cies below 1.2 GHz. A 16/17 or an 8/9 prescaler can be se-
lected for the 1.2 GHz RF synthesizers with the 8/9 prescaler
rated for input frequencies below 550 MHz. Using a digital
phase locked loop technique, the LMX237X can generate
very stable, low noise control signals for UHF and VHF volt-
age controlled oscillators (VCO鈥檚). Serial data is transferred
into the LMX237X via a 1.8V three wire interface (Data, En-
able, Clock) compatible with low voltage baseband proces-
sors. Supply voltage can range from 2.7V to 5.5V. The
LMX237X family features very low current consumption typi-
cally: LMX2370 - 6.0 mA
@
3V, LMX2371 - 5.0 mA
@
3V,
LMX2372 - 4.0 mA
@
3V.
n
n
n
n
Applications
n
n
n
n
Portable wireless communications (PCS/PCN, cordless)
Dual mode cellular telephone systems
Spread spectrum communication systems (CDMA)
Cable TV tuners (CATV)
Functional Block Diagram
DS101026-1
FastLock
鈩?/div>
, PLLatinum
鈩?/div>
and MICROWIRE
鈩?/div>
are trademarks of National Semiconductor Corporation.
TRI-STATE
廬
is a registered trademark of National Semiconductor Corporation.
漏 1999 National Semiconductor Corporation
DS101026
www.national.com

LMX2370TMX 產(chǎn)品屬性

  • 2,500

  • 集成電路 (IC)

  • 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器

  • PLLatinum™

  • PLL 頻率合成器

  • 帶旁路

  • CMOS，TTL

  • CMOS

  • 1

  • 3:1

  • 是/無

  • 2.5GHz，1.2GHz

  • 是/無

  • 2.7 V ~ 5.5 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 20-TSSOP（0.173"，4.40mm 寬）

  • 20-TSSOP

  • 帶卷 (TR)

  • *LMX2370TMX

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