Part number:
LA7780M
Manufacturer:
Sanyo
File Size:
242.75 KB
Description:
Qpsk downconverter.
LA7780M_SanyoSemiconDevice.pdf
Datasheet Details
Part number:
LA7780M
Manufacturer:
Sanyo
File Size:
242.75 KB
Description:
Qpsk downconverter.
LA7780M, QPSK Downconverter
Pin No.
Function Pin voltage (V) Note Equivalent circuit 1 RF1 input 2.8 2 RF gain 1.3 Impedance connected to pin 2 must be > 45 Ω 3 GND 0 4 RF1 output Open collector 5 6 7 VCC VCC GND 5.0 5.0 0 8 9 RF2 input (1) RF2 input (2) 2.5 2.5 V = 2.5 V R = 1 kΩ 10 Internal/external AG
Ordering number : EN5268A Monolithic Linear IC LA7780M QPSK Downconverter for CATV Systems Overview The LA7780M is a downconverter for QPSK data demodulation for digital CATV transmission.
This IC integrates a preamplifier, an AGC amplifier, a mixer, an oscillator, a post-amplifier, and other circuits in a single chip, and provides all the functions required from cable signal input through output to the A/D converter.
Functions
LA7780M Features
* Since a preamplifier is built in, the LA7780M has adequate sensitivity to handle the input signal from the cable directly. (Input signal level:
* 30 to +30 dBm)
* Both internal and external AGC are supported as the AGC amplifier drive technique.
* The output amplitude
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