LA7790M Overview
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...
LA7790M Key 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 modulation frequencies up to 10 MHz. (typ: 500 mVp-p)
- I/Q quadrature modulator
- I/Q input bias power supply
- RF amplifier