Rainbow-electronics MAX2701 Uživatelský manuál stáhnout pdf

General Description

The MAX2700/MAX2701 are highly integrated direct

downconversion (zero-IF) receivers designed for wide-

band wireless local loop (WLL) systems operating in

the 1.8GHz to 2.5GHz band. The MAX2700/MAX2701s’

zero-IF architecture eliminates the need for IF down-

conversion stages and the use of an IF SAW filter. This

reduces the overall receiver cost by reducing the com-

ponent count and required board space.

The MAX2700/MAX2701 have three main blocks: low-

noise amplifier (LNA), quadrature downconverter, and

baseband variable gain amplifiers (VGAs). The LNA is

a single-ended amplifier with selectable gain and shut-

down options. It provides a high input third-order inter-

cept point (IP3), which reduces cross-modulation and

gain compression due to high-level RF interference.

The quadrature downconverter section consists of two

highly linear double-balanced mixers driven by an

external local oscillator (LO) with a selectable LO dou-

bler. The double-balanced mixers are optimized to pro-

vide high input IP3 and minimum added noise. The

mixers’ high input second-order intercept point (IIP2)

helps minimize receiver desensitization due to high-

level AM-modulated interferers.

The two baseband VGAs in each channel provide 80dB

of total maximum gain and greater than 60dB of gain

control. The first AGC amplifier is optimized for low

noise, low power dissipation, and high linearity over the

entire gain range to ensure high gain compression per-

formance. An external lowpass filter between baseband

VGAs provides the required channel selectivity at the

adjacent channel. An integrated gain offset correction

loop circuit provides <0.3dB amplitude mismatch

between the I and Q channels.

The MAX2700/MAX2701 operate from a single +2.7V to

+3.3V power supply, drawing only 165mA of supply

current and 20µA in shutdown mode. Both devices are

available in small 48-pin TQFP packages with exposed

paddle (EP) for optimum high-frequency performance.

________________________Applications

Wireless Local Loop

Wideband Direct-Sequence Spread-Spectrum

Systems

Two-Way MMDS

Wideband 2.4GHz ISM Radios

Digital Microwave Radios

Features

♦ Input Frequency Range

1.8GHz to 2.1GHz (MAX2700)

2.1GHz to 2.5GHz (MAX2701)

♦ Cascaded Performance at 1960 MHz

3.5dB Noise Figure

-7.5dBm Input IP3 at Maximum Gain

♦ LNA with Selectable Gain and Shutdown Option

♦ High Linearity Direct I/Q Downconverter

♦ Wideband LO Quadrature Generator

♦ 3dB Baseband Channel Bandwidth of At Least

56MHz

♦ Variable Gain Baseband Amplifiers with >60dB

Control Range

♦ Baseband Gain Offset Correction Loop

♦ +2.7V to +3.3V Single-Supply Operation

♦ Small 48-pin TQFP-EP Package

MAX2700/MAX2701

1.8GHz to 2.5GHz Direct Downconversion

Receivers

________________________________________________________________ Maxim Integrated Products 1

IIN2-

DCI2+

DCI2-

IOUT2

GND

RFIN-

RFIN+

QOUT2

DCQ2-

DCQ2+

QIN2-

CEXT-

CEXT+

X2_EN

GND

LNAIN

GND

GAIN_SET

SHDN

AGC

GND

LNAOUT

GND

MIX_Q

QIN1+

QIN1-

DCQ1+

DCQ1-

QOUT1

MIXTNK

QIN2+

GND

MIX_I

GND

IIN1+

IIN1-

DCI1+

DCI1-

IOUT1

IIN2+

TQFP-EP

MAX2700

MAX2701

TOP VIEW

Pin Configuration

19-1667; Rev 0; 4/00

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

MAX2700ECM -40°C to 85°C 48 TQFP-EP

MAX2701ECM -40°C to 85°C 48 TQFP-EP

1 2 3 4 5 6 ... 27 28

MAX2700/MAX2701 1
Receivers 1

Shrnutí obsahu

Strany 1 - Receivers

General DescriptionThe MAX2700/MAX2701 are highly integrated directdownconversion (zero-IF) receivers designed for wide-band wireless local loop (WLL)

Strany 2

MAX2700/MAX27011.8GHz to 2.5GHz Direct DownconversionReceivers10 _____________________________________________________________________________________

Strany 3