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LA7790M - QPSK Transmitter

Features

  • Maximum RF amplifier output level of +10 dBm (75Ω terminator), suitable for directly driving the cable.
  • RF output frequency range of 5 to 70 MHz. Frequency range selection function permits broadband designs.
  • Electronic volume control for direct-current control of RF output level.
  • Muting ensures ample attenuation during periods with no transmission.
  • Support for both internal and external bias for I/Q modulation inputs.
  • Support for I/Q mo.

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Full PDF Text Transcription

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Ordering number : EN5689A Monolithic Linear IC LA7790M QPSK Transmitter for Cable TV Overview The LA7790M is a QPSK data transmitter for digital cable TV applications. By integrating the I/Q quadrature modulator, RF amplifier, electronic volume control, mute control, and other functions onto a single chip, parts count is reduced and set size is miniaturized. • • • • • • Varactor diode-based VCO Muting Electronic volume control Power-saving modes Switchable output frequency range Power supply voltage of 5 V (4.5 to 5.5 V) Features • Maximum RF amplifier output level of +10 dBm (75Ω terminator), suitable for directly driving the cable. • RF output frequency range of 5 to 70 MHz. Frequency range selection function permits broadband designs.
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