Rainbow-electronics MAX2442 Manual do Utilizador descarregar pdf (Página 1)

General Description

The MAX2440/MAX2441/MAX2442 highly integrated

front-end receiver ICs provide the lowest cost solution for

cordless phones and ISM-band radios operating in the

900MHz band. All devices incorporate receive image-

reject mixers to reduce filter cost. They operate with a

+2.7V to +4.8V power supply, allowing direct connection

to a 3-cell battery stack.

The signal path incorporates an adjustable-gain LNA

and an image-reject downconverter with 35dB image

suppression. These features yield excellent combined

downconverter noise figure (4dB) and high linearity with

an input third-order intercept point (IP3) of up to +2dBm.

All devices include an on-chip local oscillator (LO),

requiring only an external varactor-tuned LC tank for

operation. The integrated divide-by-64/65 dual-modulus

prescaler can also be set to a direct mode, in which it

acts as an LO buffer amplifier. Three separate power-

down inputs can be used for system power manage-

ment, including a 0.5µA shutdown mode. These parts

are compatible with commonly used modulation

schemes such as FSK, BPSK, and QPSK, as well as fre-

quency hopping and direct sequence spread-spectrum

systems. All devices come in a 28-pin SSOP package.

Evaluation kits are available for the MAX2420/

MAX2421/MAX2422. The MAX2420/MAX2421/MAX2422

are transceivers whose receive sections and pinout are

identical to the MAX2440/MAX2441/MAX2442.

For complete transceiver devices, refer to the MAX2420/

MAX2421/MAX2422/MAX2460/MAX2463 and MAX2424/

MAX2426 data sheets.

________________________Applications

Cordless Phones Spread-Spectrum Communications

Wireless Telemetry Two-Way Paging

Wireless Networks

Features

♦ Receive Mixer with 35dB Image Rejection

♦ Adjustable-Gain LNA

♦ Up to +2dBm Combined Receiver Input IP3

♦ 4dB Combined Receiver Noise Figure

♦ Low Current Consumption:

23mA Receive

9.5mA Oscillator

♦ 0.5µA Shutdown Mode

♦ Operates from Single +2.7V to +4.8V Supply

MAX2440/MAX2441/MAX2442

900MHz Image-Reject Receivers

________________________________________________________________ Maxim Integrated Products 1

GND

TANK

GND

PREOUT

PREGND

MOD

DIV1

VCOON

RXON

GND

LNAGAIN

GND

RXIN

GND

RXOUT

CAP1

SSOP

TOP VIEW

MAX2440

MAX2441

MAX2442

TANK

___________________Pin Configuration

19-1352; Rev 2; 12/00

PART

MAX2440EAI

MAX2441EAI

MAX2442EAI

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

28 SSOP

_______________Ordering Information

Functional Diagram appears at end of data sheet.

High side

INJECTION

TYPE

+ 10.7

LO FREQ

(MHz)

High side

+ 70

+ 46

MAX2442

MAX2441

MAX2440

PART

10.7

IF FREQ

(MHz)

______________________Selector Guide

EVALU

TIO

AILA

BLE

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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Resumo do Conteúdo

Página 1 - 900MHz Image-Reject Receivers

General DescriptionThe MAX2440/MAX2441/MAX2442 highly integratedfront-end receiver ICs provide the lowest cost solution forcordless phones and ISM-ban

Página 2

MAX2440/MAX2441/MAX2442900MHz Image-Reject Receivers10 ______________________________________________________________________________________To disabl

Página 3

Oscillator-Tank PC Board LayoutThe parasitic PC board capacitance, as well as PCBtrace inductance and package inductance, can affectoscillation freque

Página 4

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

Página 5

MAX2440/MAX2441/MAX2442900MHz Image-Reject Receivers2 _______________________________________________________________________________________ABSOLUTE

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AC ELECTRICAL CHARACTERISTICS(MAX242X/MAX246X EV kit, VCC= +3.3V; fLO= 925.7MHz (MAX2440), fLO= 961MHz (MAX2441), fLO= 985MHz (MAX2442), fRXIN= 915MHz

Página 7

MAX2440/MAX2441/MAX2442900MHz Image-Reject Receivers4 _______________________________________________________________________________________AC ELECTR

Página 8

MAX2440/MAX2441/MAX2442900MHz Image-Reject Receivers_______________________________________________________________________________________ 5242826343

Página 9

550500011k10k100 100kPRESCALER OUTPUT LEVELvs. LOAD RESISTANCE10050MAX2440/1/2-13LOAD RESISTANCE (Ω)PRESCALER OUTPUT LEVEL (mVp-p)20015035030025045040

Página 10

MAX2440/MAX2441/MAX2442900MHz Image-Reject Receivers_______________________________________________________________________________________ 7Pin Descr

Página 11

MAX2440/MAX2441/MAX2442900MHz Image-Reject Receivers8 _______________________________________________________________________________________Pin Descr

Página 12

MAX2440/MAX2441/MAX2442900MHz Image-Reject Receivers_______________________________________________________________________________________ 9Detailed

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Rainbow-electronics MAX2442 Manual do Utilizador Página 1

Consulte online ou descarregue Manual do Utilizador para Hardware Rainbow-electronics MAX2442. Rainbow Electronics MAX2442 User Manual Manual do Utilizador

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Rainbow-electronics MAX2442 Manual do Utilizador Página 1

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