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MAX2235
900MHz 애플리케이션을 위한 +3.6V, 1W 오토램핑 (Autoramping) 전력 증폭기


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전체 데이터 시트 (PDF, 192kB)
English Download this datasheet in PDF format다운로드

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.

주요기능   애플리케이션/용도
  • 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 대역 애플리케이션
  • 아날로그 휴대전화
  • 마이크로셀룰러 GSM (Power Class 5)
  • 양방향 호출
  • 무선 데이터 네트워크

    Key Specifications:   Power Amplifiers/Drivers
    Part Number Solutions Applications Min. Frequency (MHz) Max. Frequency (MHz) Features Footprint (mm x mm) RoHS Available Package Smallest Available Package (max w/pins) (mm2) Price**
    MAX2235  900MHz
    Cellular
    AMPS
    AMR
    GSM
    ISM
    800 1,000
    +30dBm Output Power at +3.6V
    +32.5dBm Output Power at +5.0V
    37dB Power-Control Range
    47% Efficiency
    6.4 x 6.5 Yes TSSOP/20 43 $2.07 @ 1k
    See All Power Amplifiers/Drivers (9)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    다이어그램
    MAX2235: Typical Operating Circuit
    일반 동작 회로

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  • 익일에 제공되는 애플리케이션 엔지니어의 제품 선택 조언
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     데이터 시트 
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    문서 레퍼런스 19-1463; 개정판 2; 2001-09-10
    이 페이지는 최근에 변경됨: 2007-07-20



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