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900MHz Image-Reject Transceivers

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • Receive/Transmit Mixers with 35dB Image Rejection
  • Adjustable-Gain LNA
  • Up to +2dBm Combined Receiver Input IP3
  • 4dB Combined Receiver Noise Figure
  • >35dB of Transmit Power Control Range
  • PA Predriver Provides up to +2dBm
  • Low Current Consumption:
    • 23mA Receive
    • 26mA Transmit
    • 9.5mA Oscillator
  • 0.5µA Shutdown Mode
  • Operates from Single +2.7V to +4.8V Supply

Applications/Uses

  • Cordless Phones
  • Spread-Spectrum Communications
  • Two-Way Paging
  • Wireless Networks
  • Wireless Telemetry

Description

The MAX2420/MAX2421/MAX2422/MAX2460/MAX2463 are highly integrated front-end ICs that provide the lowest cost solution for cordless phones and ISM-band radios operating in the 900MHz band. All devices incorporate transmit and receive image-reject mixers to reduce filter cost. They operate with a +2.7V to +4.8V power supply, allowing direct connection to a three-cell battery stack.

The receive path incorporates an adjustable-gain LNA and an image-reject downconverter with 35dB image suppression. These features yield excellent combined downconverter noise figure (4dB) and high linearity with an input third-order intercept point (IP3) of up to +2dBm.

The transmitter consists of a variable-gain IF amplifier with more than 35dB control range, an image-reject upconverter with 35dB image rejection, and a power- amplifier (PA) predriver that produces up to +2dBm (in some applications serving as the final power stage).

All devices include an on-chip local oscillator (LO), requiring only an external varactor-tuned LC tank for operation. The integrated divide-by-64/65 dual-modulus prescaler can also be set to a direct mode, in which it acts as an LO buffer amplifier. Four separate power-down inputs can be used for system power management, including a 0.5µA shutdown mode. These parts are compatible with commonly used modulation schemes such as FSK, BPSK, and QPSK, as well as frequency hopping and direct sequence spread-spectrum systems. All devices come in a 28-pin SSOP package.

For applications using direct VCO or BPSK transmit modulation, as well as receive image rejection, consult the MAX2424/MAX2426 data sheet. For receive-only devices, refer to the MAX2440/MAX2441/MAX2442 data sheet.

Simplified Block Diagram

MAX2420, MAX2421, MAX2422, MAX2460, MAX2463: Typical Operating Circuit MAX2420, MAX2421, MAX2422, MAX2460, MAX2463: Typical Operating 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 .