參數(shù)資料
型號(hào)： LMX2372MDC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： PLL合成/DDS/VCOs
英文描述： PLL FREQUENCY SYNTHESIZER, 1200 MHz, UUC
封裝： DIE
文件頁(yè)數(shù)： 1/27頁(yè)
文件大小： 550K
代理商： LMX2372MDC
LMX2370/LMX2371/LMX2372
PLLatinum Dual Frequency Synthesizer for RF
Personal Communications
LMX2370
2.5 GHz/1.2 GHz
LMX2371
2.0 GHz/1.2 GHz
LMX2372
1.2 GHz/1.2 GHz
General Description
The LMX237x family of monolithic, integrated dual frequency
synthesizers, including prescalers, is designed to be used as
a first and second local oscillator for dual mode or dual con-
version transceivers. It is fabricated using National’s 0.5u
ABiCV silicon BiCMOS process. The LMX237x contains 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 frequencies below
1.2 GHz. A 16/17 or an 8/9 prescaler can be selected for the
1.2 GHz RF synthesizers with the 8/9 prescaler rated for in-
put 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 voltage
controlled oscillators (VCOs). Serial data is transferred into
the LMX237x via a 1.8 V three wire interface (Data, Enable,
Clock) compatible with low voltage baseband processors.
Supply voltage can range from 2.7V to 5.5V. The LMX237x
family features very low current consumption typically:
LMX2370 - 6.0 mA at 3V, LMX2371 - 5.0 mA at 3V, LMX2372
- 4.0 mA at 3V.
The LMX237x are available in a 24-pad chip scale (CSP) or
a 20-pin TSSOP surface mount plastic package.
Features
n
2.7V–5.5V operation
n
Ultra low current consumption
n
Low phase detector noise floor
n
Low voltage MICROWIRE interface (1.8V up to V
CC)
n
Low prescaler values
32/33 at f
IN ≤ 2.5 GHz
16/17 at f
IN ≤ 1.2 GHz
8/9 at f
IN ≤ 550 MHz
n
Selectable charge pump current levels
n
Selectable FastLock mode
n
Enhanced ESD protection
n
Available in small 24-pad chip scale package (3.5 x 4.5
x 1.0 mm)
Applications
n
Portable wireless communications (PCS/PCN, cordless)
n
Dual mode cellular telephone systems
n
Spread spectrum communication systems (CDMA)
n
Cable TV tuners (CATV)
Functional Block Diagram
FastLock, PLLatinum and MICROWIRE are trademarks of National Semiconductor Corporation.
TRI-STATE is a registered trademark of National Semiconductor Corporation.
DS101026-4
July 2000
LMX2370/LMX2371/LMX2372
PLLatinum
Dual
Frequency
Synthesizer
for
RF
Personal
Communications
2000 National Semiconductor Corporation
DS101026
www.national.com
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