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Número de pieza | LA7790M | |
Descripción | QPSK Transmitter for Cable TV | |
Fabricantes | Sanyo | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de LA7790M (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
No Preview Available ! 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
1 page Note 7
Input: SG1 = 1 MHz CW, 500 mVp-p
Output:
LA7790M
Note 8
Input: SG3 = 25 MHz CW, –6 dBm
Output:
Note 9
Input: SG1 = 1 MHz CW, 500 mVp-p
Output:
Note 10
I1 = pin 1 current when V20 = 4 V (power save on).
No. 5689-5/14
5 Page Equivalent circuit of RF amplifier block
0 to 3µA
Mute
23
300
VCC
Choke
Coil
Vout
RF
output
1
VCC 30 mA
LA7790M
Load resistor
75
VCC
from
1st stage
5k
R2
Mute
2nd stage
1st stage
3.5 V
RF input
300
22
R1
Vin
300 Power
20 save
0 to 4 µA
Power save
RF
Amplifier
Gain
=· ·
—R1—+—R—2 —+ —30—0
R1 + 300
R1 : Input Resistor
The gain of RF amplifier can be adjusted by changing the value R1.
Unit (resistance : Ω)
No. 5689-11/14
11 Page |
Páginas | Total 14 Páginas | |
PDF Descargar | [ Datasheet LA7790M.PDF ] |
Número de pieza | Descripción | Fabricantes |
LA7790M | QPSK Transmitter for Cable TV | Sanyo |
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