max2422eait Maxim Integrated Products, Inc., max2422eait Datasheet

max2422eait

Manufacturer Part Number

max2422eait

Description

900mhz Image-reject Transceivers

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX2422EAIT.pdf (14 pages)

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The MAX2420/MAX2421/MAX2422/MAX2460/MAX2463

are highly integrated front-end ICs that provide the lowest

cost solution for cordless phones and ISM-band radios

operating in the 900MHz band. All devices incorporate

transmit and receive image-reject mixers to reduce filter

cost. They operate with a +2.7V to +4.8V power supply,

allowing direct connection to a three-cell battery stack.

The receive 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.

The transmitter consists of a variable-gain IF amplifier

with more than 35dB control range, an image-reject

upconverter with 35dB image rejection, and a power-

amplifier (PA) predriver that produces up to +2dBm (in

some applications serving as the final power stage).

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. Four 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.

For applications using direct VCO or BPSK transmit mod-

ulation, as well as receive image rejection, consult the

MAX2424/MAX2426 data sheet. For receive-only devices,

refer to the MAX2440/MAX2441/MAX2442 data sheet.

Cordless Phones

Wireless Telemetry

Wireless Networks

________________________Applications

19-1234; Rev 5; 8/03

______________________Selector Guide

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.

MAX2420

MAX2421

MAX2422

MAX2460

MAX2463

PART

IF FREQ

(MHz)

10.7

110

________________________________________________________________ Maxim Integrated Products

Spread-Spectrum Communications

Two-Way Paging

General Description

INJECTION

High side

Low side

TYPE

900MHz Image-Reject Transceivers

LO FREQ

(MHz)

+ 10.7

- 10.7

- 110

+ 46

+ 70

o Receive/Transmit Mixers with 35dB Image Rejection

o Adjustable-Gain LNA

o Up to +2dBm Combined Receiver Input IP3

o 4dB Combined Receiver Noise Figure

o >35dB of Transmit Power Control Range

o PA Predriver Provides up to +2dBm

o Low Current Consumption: 23mA Receive

o 0.5µA Shutdown Mode

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

___________________Pin Configuration

Functional Diagram appears on last page.

_______________Ordering Information

MAX2420EAI

MAX2421EAI

MAX2422EAI

MAX2460EAI

MAX2463EAI

TOP VIEW

PART

LNAGAIN

TXGAIN

RXOUT

TXOUT

CAP1

CAP2

RXIN

GND

TXIN

N.C.

-40°C to +85°C

TEMP RANGE

MAX2420

MAX2421

MAX2422

MAX2460

MAX2463

SSOP

26mA Transmit

9.5mA Oscillator

28 SSOP

PIN-PACKAGE

TXON

GND

TANK

PREOUT

PREGND

MOD

DIV1

VCOON

RXON

GND

TANK

Features

Related parts for max2422eait

max2422eait Summary of contents

Page 1

Rev 5; 8/03 900MHz Image-Reject Transceivers General Description The MAX2420/MAX2421/MAX2422/MAX2460/MAX2463 are highly integrated front-end ICs that provide the lowest cost solution for cordless phones and ISM-band radios operating in the 900MHz band. All devices incorporate transmit and receive image-reject ...

Page 2

Image-Reject Transceivers ABSOLUTE MAXIMUM RATINGS V to GND ...........................................................-0.3V to +5.5V CC TXIN Input Power (330Ω system) ......................................-8dBm Voltage on TXOUT......................................-0. Voltage on TXGAIN, LNAGAIN, TXON, RXON, VCOON, DIV1, MOD ....................-0. RXIN Input Power..............................................................10dBm TANK, ...

Page 3

Image-Reject Transceivers AC ELECTRICAL CHARACTERISTICS (MAX242X/246X EV kit +3.3V 904.3MHz (MAX2460 805MHz (MAX2463 TXGAIN = V ; VCOON = 2.4V; RXON = TXON = MOD = DIV1 = ...

Page 4

Image-Reject Transceivers AC ELECTRICAL CHARACTERISTICS (continued) (MAX242X/246X EV kit +3.3V 904.3MHz (MAX2460 805MHz (MAX2463 TXGAIN = V ; VCOON = 2.4V; RXON = TXON = MOD = DIV1 ...

Page 5

Image-Reject Transceivers (MAX242X/246X EV kit +3.3V (MAX2460 805MHz (MAX2463 VCOON = 2.4V; RXON = TXON = MOD = DIV1 = PREGND = GND; T RECEIVER SUPPLY CURRENT vs. TEMPERATURE 42 ...

Page 6

Image-Reject Transceivers (MAX242X/246X EV kit +3.3V 925.7MHz (MAX2420 (MAX2460 805MHz (MAX2463 RXIN VCOON = 2.4V; RXON = TXON = MOD = DIV1 = PREGND = GND; T MAX2420 ...

Page 7

Image-Reject Transceivers (MAX242X/246X EV kit 3.3V (MAX2460 805MHz (MAX2463 VCOON = 2.4V; RXON = TXON = MOD = DIV1 = PREGND = GND; T MAX2421 TRANSMITTER OUTPUT SPECTRUM 0 ...

Page 8

Image-Reject Transceivers PIN NAME Supply-Voltage Input for Master Bias Cell. Bypass with a 47pF low-inductance capacitor and 0.1µ GND (pin 28, if possible). Receive Bias Compensation Pin. Bypass with a 47pF low-inductance capacitor and 0.01µF ...

Page 9

Image-Reject Transceivers PIN NAME Supply-Voltage Input for Prescaler. Bypass with a 47pF low-inductance capacitor and 0.01µF to GND (pin 20 if possible). Supply-Voltage Input for VCO and Phase Shifters. Bypass with a 47pF low-inductance capacitor to ...

Page 10

Image-Reject Transceivers Detailed Description The following sections describe each of the functional blocks shown in the Functional Diagram. The MAX2420/MAX2421/MAX2422/MAX2460/MAX2463’s receive path consists of a 900MHz low-noise amplifier, an image-reject mixer, and an IF buffer amplifier. The LNA’s gain ...

Page 11

Image-Reject Transceivers The local oscillator is resistant to LO pulling caused by changes in load impedance that occur as the part is switched from standby mode, with just the oscillator run- ning to either transmit or receive mode. The ...

Page 12

Image-Reject Transceivers coupling of the varactor is a way to reduce the effects of high-varactor tolerance and increase loaded Q. For a wider tuning range use larger values for C2 and varactor with a large capacitance ...

Page 13

Image-Reject Transceivers LNAGAIN RXIN CAP1 RXON TXON CAP2 TXOUT *CRISS-CROSSED PHASE-SHIFTER CONNECTIONS ______________________________________________________________________________________ 90° Σ 0° 0° 90° ÷1/64/65 BIAS PHASE SHIFTER MAX2420 MAX2421 0° 90° MAX2422 MAX2460* MAX2463* 90° Σ 0° TXGAIN Functional Diagram RXOUT DIV1 MOD PREOUT ...

Page 14

Image-Reject Transceivers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages NOTES: 1. D&E DO NOT INCLUDE MOLD FLASH. ...

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