MAX2235EUP+T Maxim Integrated Products, MAX2235EUP+T Datasheet

MAX2235EUP+T

Manufacturer Part Number

MAX2235EUP+T

Description

RF Amplifier +3.6V 1W Autoramping Power Amplifier for

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX2235EUP.pdf (8 pages)

Specifications of MAX2235EUP+T

Operating Frequency

800 MHz to 1000 MHz

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 8
Download datasheet (178Kb)

The MAX2235 low-voltage, silicon RF power amplifier

(PA) is designed for use in the 900MHz frequency band.

It operates directly from a single +2.7V to +5.5V supply,

making it suitable for use with 3-cell NiCd or 1-cell Li-Ion

batteries. The device delivers +30dBm (1W) typical out-

put power from a +3.6V supply or +28dBm from a +2.7V

supply.

The MAX2235’s gain is adjustable over a 37dB range.

A power-control pin controls gain and bias to maintain

optimum efficiency, even at lower output power levels,

thus extending the operating life of the battery. At

+30dBm output power, efficiency is typically 47%. An

additional power-saving feature is a shutdown mode

that typically reduces supply current below 1µA.

A key feature of this PA is its autoramping capability.

During turn-on and turn-off periods, the RF envelope is

controlled to approximate a raised cosine on the rising

and falling edge, thereby minimizing transient noise

and spectral splatter. The ramp time is set by selecting

the value of an external capacitor.

The MAX2235 is intended for use in constant envelope

applications such as AMPS, two-way paging, or FSK-

based communications in the 900MHz ISM band. The

device is available in a thermally enhanced 20-pin

TSSOP package with a heat slug.

19-1463; Rev 2; 10/00

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.

RAMP

SHDN

900MHz ISM-Band Applications

Two-Way Pagers

Analog Cellular Phones

Microcellular GSM (Power Class 5)

Wireless Data Networks

RFIN

NOTE: SOLDER UNDERSIDE OF METAL SLUG TO BOARD GND PLANE.

REF

BIAS

VGA

________________________________________________________________ Maxim Integrated Products

GND

Functional Diagram

General Description

GND

8, 9

6, 7, 10

Amplifier for 900MHz Applications

MAX2235

Applications

GND

13, 14, 17, 18, SLUG

+3.6V, 1W Autoramping Power

15, 16

RFOUT

o 800MHz to 1000MHz Operation

o High Output Power at 836MHz

o +2.7V to +5.5V Single-Supply Operation

o Automatic Power-Up/Power-Down Ramp

o Direct On/Off Keying (OOK) without Intersymbol

o 37dB Power-Control Range

o 47% Efficiency

o <1µA Supply Current in Shutdown Mode

o Small 20-Pin TSSOP Package with Heat Slug

MAX2235EUP

Interference or VCO Pulling

NOTE: THE GROUND OF THE OUTPUT STAGE IS CONNECTED TO THE

UNDERSIDE METAL SLUG.

+32.5dBm at +5.0V

+30dBm at +3.6V

+29dBm at +3.0V

+28dBm at +2.7V

PART

TOP VIEW

RFIN

GND

TEMP. RANGE

-40°C to +85°C

Ordering Information

TSSOP-EP

MAX2235

Pin Configuration

20 TSSOP-EP

PIN-PACKAGE

GND

RFOUT

GND

REF

RAMP

SHDN

Features

Related parts for MAX2235EUP+T

MAX2235EUP+T Summary of contents

Page 1

... VGA GND GND NOTE: SOLDER UNDERSIDE OF METAL SLUG TO BOARD GND PLANE. ________________________________________________________________ Maxim Integrated Products 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. +3.6V, 1W Autoramping Power o 800MHz to 1000MHz Operation o High Output Power at 836MHz +32 ...

Page 2

Autoramping Power Amplifier for 900MHz Applications ABSOLUTE MAXIMUM RATINGS V to GND ...........................................................-0.3V to +6.5V CC SHDN to GND.............................................-0. GND .................................................-0. Input Power .................................................+13dBm (20mW) Maximum Load Mismatch without Damage, V ...

Page 3

Amplifier for 900MHz Applications AC ELECTRICAL CHARACTERISTICS (MAX2235 Evaluation Kit unconnected +25°C, unless otherwise noted.) (Note 3) A PARAMETER SYMBOL Operational Frequency Range f RFIN (Note 4) Minimum Output Power P RFOUT Power Added Efficiency ...

Page 4

Autoramping Power Amplifier for 900MHz Applications (MAX2235 Evaluation Kit unconnected, f SUPPLY CURRENT vs. OUTPUT POWER 700 T = -40° +25°C 600 +85°C A 500 400 300 200 100 0 ...

Page 5

Amplifier for 900MHz Applications (MAX2235 Evaluation Kit unconnected, f RISE TIME vs. RAMPING CAPACITANCE 1400 FULL POWER = +10dBm 1200 FULL POWER = +20dBm 1000 800 600 400 FULL POWER = +30dBm 200 ...

Page 6

Autoramping Power Amplifier for 900MHz Applications 100pF 8.2nH J1 SMA V CC 1000pF 100pF 100pF V CC 1000pF 100pF J3 0.01µF 1µF J4 Detailed Description The MAX2235 power amplifier (PA) operates over a wide frequency range of 800MHz ...

Page 7

Amplifier for 900MHz Applications Third Stage (Power Stage) This last stage delivers 30dBm to a 50Ω load. It oper- ates in Class E to achieve a high power-added efficien- cy (PAE). Proper output matching is required for optimal output power. ...

Page 8

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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