آر اف (فرکانس رادیویی) و بی‌سیم تقویت‌کننده‌ آر اف

Product Attributes

Introduction

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 +28 dBm from a +2.7V supply.

Features

• 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 +30 dBm 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 device is available in a thermally enhanced 20-pin TSSOP package with a heat slug.

Applications

• 900MHz ISM-Band Applications
• Two-Way Pagers
• Analog Cellular Phones
• Microcellular GSM (Power Class 5)
• Wireless Data Networks