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Data Sheet

FULL DATA SHEET (PDF, 192kB) Download   E-Mail

Description

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 output 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.

Key Features		Applications/Uses
800MHz to 1000MHz Operation High Output Power at 836MHz +32.5dBm at +5.0V +30dBm at +3.6V +29dBm at +3.0V +28dBm at +2.7V +2.7V to +5.5V Single-Supply Operation Automatic Power-Up/Power-Down Ramp Direct On/Off Keying (OOK) without Intersymbol Interference or VCO Pulling 37dB Power-Control Range 47% Efficiency <1µA Supply Current in Shutdown Mode Small 20-Pin TSSOP Package with Heat Slug		900MHz ISM-Band Applications Analog Cellular Phones Microcellular GSM (Power Class 5) Two-Way Paging Wireless Data Networks

Diagram

Typical Operating Circuit

Application Notes

Application Note 1005: Ultra-Low Cost +30dBm PA for GSM and 900MHz-ISM Applications - MAX2235 Application Note 3702: MAX2235—Layout Optimization Techniques - max2235

Evaluation Kits

MAX2235EVKIT

Design Guides

Wireless (PDF)

Reliability Reports

Reliability Report: MAX2235.pdf Show FIT data for: MAX2235

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-4 of 4
MAX2235	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX2235EUP			TSSOP-EP;20 pin;43 mm² Outline Drawing: 21-0108 (PDF) Land Pattern: 90-0114 (PDF) Use pkgcode/variation: U20E-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX2235EUP-T			TSSOP-EP;20 pin;43 mm² Outline Drawing: 21-0108 (PDF) Land Pattern: 90-0114 (PDF) Use pkgcode/variation: U20E-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX2235EUP+			TSSOP-EP;20 pin;43 mm² Outline Drawing: 21-0108 (PDF) Land Pattern: 90-0114 (PDF) Use pkgcode/variation: U20E+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX2235EUP+T			TSSOP-EP;20 pin;43 mm² Outline Drawing: 21-0108 (PDF) Land Pattern: 90-0114 (PDF) Use pkgcode/variation: U20E+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Notes and Comments

1W autoramping power amplifier with gain control

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