LA7790M Datasheet, PDF (1/14 Pages) Sanyo Semicon Device – QPSK Transmitter for Cable TV

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.
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)
• 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)
Package Dimensions
unit: mm
3108-MFP24D
[LA7790M]
Functions
• I/Q quadrature modulator
• I/Q input bias power supply
• RF amplifier
SANYO: MFP24D
Ambient temperature, Ta (°C)
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
5061998RM (OT) No. 5689-1/14