Datasheet > PCS1900

PCS1900

更新时间： 2024-11-17 22:26:47

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描述
Triple-band VCO for GSM900/DCS1800/PCS1900

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PCS1900 数据手册

January 2004

LMX2604

Triple-band VCO for GSM900/DCS1800/PCS1900

General Description

Features

n On-chip Triple-band RF VCOs

GSM: 880 MHz to 915 MHz

DCS: 1710 MHz to 1785 MHz

PCS: 1850 MHz to 1910 MHz

n On-chip tank circuit

The LMX2604 is a fully integrated VCO (Voltage-Controlled

Oscillator) IC designed for GSM900/DCS1800/PCS1900

triple-band application. The IC is ideal for use in the trans-

mitter modulation loop by providing extremely small form

factor and low phase noise. The IC has two VCOs, one for

GSM and a second for DCS/PCS. The IC has two separate

buffer amplifiers to drive an external high power amplifier,

one for GSM900 band and the other one for DCS1800/

PCS1900 bands. The IC also has a differential buffer ampli-

fier to drive a mixer for the offset PLL.

n Low phase noise

— -167 dBc/Hz 20 MHz offset in GSM band

— -163 dBc/Hz 20 MHz offset in DCS band

— -162 dBc/Hz 20 MHz offset in PCS band

n High output power

The resonant circuits of the VCOs are fully integrated in the

chip to ease the application of the IC. The high quality factor

of the embedded tank circuit achieves very low phase noise

characteristics at the VCO output. The only required external

components are a couple of supply bypass capacitors and

matching components.

— +6 dBm in GSM mode

— +6 dBm in DCS and PCS mode

n Low current consumption

— 18 mA in GSM mode

— 15 mA in DCS and PCS mode

n +2.6 V to +3.0 V supply voltage

n 0.25 µm RF CMOS process

n Small 20-pin 4x4 LLP package

A control pin for controlling the oscillation frequency is

shared by the two VCOs.

The LMX2604 IC is provided in a 20-pin 4x4 LLP (Leadless

Leadframe package).

Applications

n Transmit VCO for GSM, DCS, and PCS

n Closed loop modulation systems

Functional Block Diagram

20066101

™

FastLock is a trademark of National Semiconductor Corporation.

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

DS200661

www.national.com

12 3 4 5 6 7...14

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