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900MHz ISM-Band, 250mW Power Amplifiers with Analog or Digital Gain Control

Product Details

Key Features

Parametric specs for Power Amplifiers/Drivers
Frequency (MHz) (min) 800
Frequency (MHz) (max) 1000
POUT (dBm) 24
Efficiency (%) 44
Low Power Shutdown Yes
Footprint (mm x mm) 3.9 x 6.0
Package/Pins QSOP/16
Budgetary
Price (See Notes)
2.65
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Simplified Block Diagram

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Parameters

Parametric specs for Power Amplifiers/Drivers
Frequency (MHz) (min) 800
Frequency (MHz) (max) 1000
POUT (dBm) 24
Efficiency (%) 44
Low Power Shutdown Yes
Footprint (mm x mm) 3.9 x 6.0
Package/Pins QSOP/16
Budgetary
Price (See Notes)
2.65

Key Features

  • 800MHz to 1000MHz Frequency Range
  • 250mW (+24dBm) Output Power at 915MHz from +3.6V Supply
  • +2.7V to +5.5V Single-Supply Operation
  • 44% Power-Added Efficiency
  • 24dB Power Gain
  • 24dB Analog Gain-Control Range (MAX2232)
  • Three Levels of Digitally Programmed Power Gain in 10dB Steps (MAX2233)
  • Programmable RF Power Envelope Ramping (MAX2232)
  • Thermal Shutdown
  • Programmable Thermal Shutdown Timeout Period
  • 0.2µA Low-Power Shutdown Mode
  • Low ΔVSWR in Standby and Shutdown Modes

Applications/Uses

  • 868MHz European ISM Band
  • 900MHz ISM-Band Applications
  • Digital Cordless Phones
  • FM Analog Transmitters
  • Wireless Data

Description

The MAX2232/MAX2233 low-voltage, silicon RF power amplifiers (PAs) are designed for use in the 900MHz ISM band. They operate from a single +2.7V to +5.5V supply, allowing them to be powered directly from a 3-cell NiCd or a 1-cell Lithium-Ion battery. The devices typically deliver 250mW (+24dBm) of output power at 915MHz from a single +3.6V supply, or 150mW (+22dBm) from a single +2.7V supply. At +24dBm output power, power-added efficiency (PAE) is 44%.

The MAX2232/MAX2233 provide 24dB of gain, which is adjustable over a continuous 24dB span via the analog gain-control pin of the MAX2232 or in two 10dB steps via the 2-bit programmable gain-control DAC of the MAX2233. An external capacitor sets the RF output power envelope ramp time, reducing spurious emissions during power-up and power-down by providing a gradual change in output power (MAX2232).

The MAX2232/MAX2233 feature a low-power shutdown mode, which typically draws less than 1µA of supply current, saving power during "idle slots" in time-division multiple-access (TDMA) systems. The ΔVSWR of the RF input in shutdown mode relative to normal operation is 1.2:1. The devices also feature a thermal shutdown function, enabling the PA to protect itself from excessive temperature conditions that could damage the IC. A capacitor to ground limits thermal cycling by setting a thermal shutdown timeout period.

The MAX2232/MAX2233 are available in a space-saving, thermally enhanced 16-pin power-QSOP (PQSOP) package.

Simplified Block Diagram

MAX2232, MAX2233: Typical Application Circuit MAX2232, MAX2233: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.