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PDF LA7780M Data sheet ( Hoja de datos )
| Número de pieza | LA7780M | |
| Descripción | QPSK Downconverter for CATV Systems | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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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.
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 of the post amplifier used to drive
the A/D converter is 2 Vp-p (typical).
• Applications can be designed to use either a crystal or an
inductor oscillator.
Functions
• Preamplifier
• AGC amplifier
• Mixer
• Oscillator
• Post amplifier
• IF AGC (internal/external)
• AGC detector
Package Dimensions
unit: mm
3108-MFP24D
[LA7780M]
24 13
1 1125.3
0.25
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Circuit voltage
Circuit current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
V max
I4
I13
I16
Pd max
Topr
Tstg
Conditions
Pins 5, 6, and 17
Pins 4, 12, and 24
The pin 4 output current
The pin 13 sink current
The pin 16 sink current
Ta ≤ 70°C
0.4 1.27
0.67
SANYO: MFP24D
Ratings
7.0
VCC
30
2
2
540
–20 to +70
–55 to +150
Unit
V
V
mA
mA
mA
mW
°C
°C
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
D1698RM (OT) No. 5268-1/9
1 page  
Pin Descriptions
Pin No.
Function
Pin voltage (V)
1 RF1 input
2.8
LA7780M
Note
Equivalent circuit
2 RF gain
3 GND
1.3 Impedance connected to pin 2 must be > 45 Ω
0
4 RF1 output Open collector
5 VCC
6 VCC
7 GND
8 RF2 input (1)
9 RF2 input (2)
5.0
5.0
0
2.5 V = 2.5 V
2.5 R = 1 kΩ
Internal/external
10
AGC switch
0 (GND)
1.0 (open)
Pin 10 → GND : Internal or external AGC
(narrow control range)
Pin 10 → open : External AGC (wide control range)
11 AGC filter 2
Open collector I1 = 20 µA
12 AGC filter 1
Open base
I2 = 100 µA
(Pin 10 → GND) I3, I4 & Q1 are switched on and off by pin 10.
4.0 (Pin 10 open)
Continued on next page.
No. 5268-5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LA7780M.PDF ] | |
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