AD8349AREZ-RL7 RF/IF and RFID

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1. Describe

The AD8349AREZ-RL7 is a monolithic silicon RF quadrature modulator designed for the frequency range of 700 MHz to 2700 MHz. Its excellent phase accuracy and amplitude balance enable high-performance direct RF modulation for communication systems. The differential LO input signal is buffered and split into in-phase (I) and quadrature-phase (Q) signals using a polyphase phase splitter. These two LO signals are further buffered and then mixed with corresponding I-channel and Q-channel baseband signals in two Gilbert cell mixers. The outputs of the mixers are then summed together in the output amplifier. The output amplifier is designed to drive a 50 Ω load. The RF output can be turned on and off within 50 ns by applying a control pulse to the ENOP pin. The AD8349AREZ-RL7 can be used as a direct RF modulator in digital communication systems. Its high dynamic range and high modulation accuracy also make it a perfect IF modulator in local multipoint distribution systems (LMDS) using complex modulation formats. The AD8349AREZ-RL7 is fabricated on Analog Devices' advanced complementary silicon bipolar process and is available in a 16-lead exposed pad TSSOP package. Its performance is rated from –40°C to +85°C.

2. Feature

    1. Output frequency range: 700 MHz to 2700 MHz

    2. Modulation bandwidth: DC to 160 MHz (large signal bandwidth)

    3. 1 dB output compression: 5.6 dBm @ 2140 MHz

    4. Output disable function: output below –50 dBm in < 50 ns

    5. Noise floor: –156 dBm/Hz

    6. Phase quadrature error: 0.3 degrees @ 2140 MHz

    7. Amplitude balance: 0.1 dB

    8. Single supply: 4.75 V to 5.5 V

    9. Pin compatible with AD8345/AD8346s

  10. 16-Pin Exposed Pad TSSOP Package

3. Application

    1. Cellular/PCS Communication System Infrastructure 

    2.WCDMA/CDMA2000/PCS/GSM/EDGE

    3. Wireless LAN/Wireless Local Loop

    4. LMDS/Broadband Wireless Access System