參數(shù)資料
型號(hào)： LMX2377USLEX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： XO, clock
英文描述： POSITIONER
中文描述： PLL FREQUENCY SYNTHESIZER, 2500 MHz, PQCC20
封裝： PLASTIC, UTCSP-20
文件頁(yè)數(shù)： 1/44頁(yè)
文件大?。?/td> 3181K
代理商： LMX2377USLEX
LMX2377U
PLLatinum
Ultra Low Power Dual Frequency
Synthesizer for RF Personal Communications
2.5 GHz/1.2 GHz
General Description
The LMX2377U device is a high performance frequency
synthesizer with integrated dual modulus prescalers. The
LMX2377U device is designed for use as a local oscillator for
the first and second RF of a dual conversion radio trans-
ceiver.
A 16/17 or a 32/33 prescale ratio can be selected for the
Main synthesizer. An 8/9 or a 16/17 prescale ratio can be
selected for the Aux synthesizer. Using a proprietary digital
phase lock technique, the LMX2377U device generates very
stable, low noise control signals for UHF and VHF voltage
controlled oscillators. Both the Main and Aux synthesizers
include a two-level programmable charge pump. The Main
synthesizer has dedicated Fastlock circuitry.
Serial data is transferred to the devices via a three-wire
interface (Data, LE, Clock). The low voltage logic interface
allows connection to 1.8V devices. Supply voltages from
2.7V to 5.5V are supported. The LMX2377U features ultra
low current consumption, typically 3.5 mA at 3.0V.
The LMX2377U devices are available in 20-Pin TSSOP,
24-Pin CSP, and 20-Pin UTCSP surface mount plastic pack-
ages.
Features
n
Ultra Low Current Consumption
n
Upgrade and Compatible to the LMX2370
n
2.7V to 5.5V Operation
n
1.8V to 5.0V MICROWIRE Logic Interface
n
Selectable Synchronous or Asynchronous Powerdown
Mode:
I
CC-PWDN
= 1 μA typical
n
Selectable Dual Modulus Prescaler:
Main: 16/17 or 32/33
Aux: 8/9 or 16/17
n
Selectable Charge Pump TRI-STATE
Mode
n
Programmable Charge Pump Current Levels
Main and Aux: 0.95 or 3.8 mA
n
Selectable Fastlock
Mode for the Main Synthesizer
n
Open Drain Analog Lock Detect Output
n
Available in 20-Pin TSSOP, 24-Pin CSP, and 20-Pin
UTCSP
Applications
n
Mobile Handsets
(GSM, GPRS, W-CDMA, CDMA, PCS, AMPS, PDC,
DCS)
n
Cordless Handsets
(DECT, DCT)
n
Wireless Data
n
Cable TV Tuners
Thin Shrink Small Outline Package
(MTC20)
Chip Scale Package (SLB24A)
Ultra Thin Chip Scale Package
(SLE20A)
20022680
20022681
20022695
PLLatinum
is a trademark of National Semiconductor Corporation.
November 2002
L
C
2002 National Semiconductor Corporation
DS200226
www.national.com
相關(guān)PDF資料
PDF描述
LMX2377U PLLatinum⑩ Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications
LMX2471 3.6 GHz Delta-Sigma Fractional-N PLL with 1.7 GHz Integer-N PLL
LMX2502LQ1635 PLLatinum⑩ Frequency Synthesizer System with Integrated VCO
LMX2502LQX1635 PLLatinum⑩ Frequency Synthesizer System with Integrated VCO
LMX2502 PLLatinum⑩ Frequency Synthesizer System with Integrated VCO
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX2377UTM 功能描述:IC FREQ SYNTH DUAL 20TSSOP RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無(wú)/無(wú) 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
LMX2377UTMX 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications
LMX2410QM 制造商:未知廠家 制造商全稱:未知廠家 功能描述:RF/Baseband Circuit
LMX2411 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Baseband Processor for Radio Communications
LMX2411M 制造商:未知廠家 制造商全稱:未知廠家 功能描述:RF/Baseband Circuit
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