Datasheet > LMX3305_09

LMX3305_09

更新时间： 2024-09-15 05:42:27

品牌	Logo	应用领域
美国国家半导体 - NSC		射频个人通信
页数	文件大小	规格书
26页	586K
描述
Triple Phase Locked Loop for RF Personal Communications

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LMX3305_09 数据手册

OBSOLETE

April 28, 2009

LMX3305

Triple Phase Locked Loop for RF Personal

Communications

General Description

Features

The LMX3305 contains three Phase Locked Loops (PLL) on

a single chip. It has a RF PLL, an IF Rx PLL and an IF Tx PLL

for CDMA applications. The RF fractional-N PLL uses a

16/17/20/21 quadruple modulus prescaler for PCS applica-

tion and a 8/9/12/13 quadruple modulus prescaler for cellular

application. Both quadruple modulus prescalers offer modulo

1 through 16 fractional compensation circuitry. The RF frac-

tional-N PLL can be programmed to operate from 800 MHz to

1400MHz in cellular band and 1200MHz to 2300 MHz in PCS

band. The IF Rx PLL and the IF Tx PLL are integer-N fre-

quency synthesizers that operate from 45 MHz to 600 MHz

with 8/9 dual modulus prescalers. Serial data is transferred

into the LMX3305 via a microwire interface (Clock, Data, &

LE).

Three PLLs integrated on a single chip

■

RF PLL fractional-N counter

16/17/20/21 RF quadruple modulus prescaler for PCS

application

■

8/9/12/13 RF quadruple modulus prescaler for cellular

application

■

2.7V to 3.6V operation

■

Low current consumption: I_CC= 9 mA (typ) at 3.0V

Programmable or logical power down mode: I_CC= 10 µA

(typ) at 3.0V

RF PLL Fastlock feature with timeout counter

Digital lock detect

■

Microwire Interface with data preset

24-pin CSP package

The RF PLL provides a fastlock feature allowing the loop

bandwidth to be increased by 3X during initial lock-on.

The supply voltage of the LMX3305 ranges from 2.7V to 3.6V.

It typically consumes 9 mA of supply current and is packaged

in a 24-pin CSP package.

Applications

■

CDMA Cellular telephone systems

Block Diagram

10136101

TRI-STATE^®is a registered trademark of National Semiconductor Corporation.

101361

www.national.com

101361 Version 3 Revision 5 Print Date/Time: 2009/04/28 20:23:25

12 3 4 5 6 7...26

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