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PDF MGM3000X Data sheet ( Hoja de datos )
| Número de pieza | MGM3000X | |
| Descripción | Video Modulator for FM/AM-Audio | |
| Fabricantes | Siemens | |
| Logotipo |  |
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Video Modulator for
FM/AM-Audio
MGM 3000X
Bipolar IC
Features
q FM- and AM-audio modulator
q Audio carrier output for suppression of harmonics
q Sync level clamping of video input signal
q Controlling of peak white value
q Continuous adjustment of modulation depth for
positive or negative values
q Symmetrical mixer output with separate ground area
q Symmetrical oscillator with separate RF-ground
q Low spurious radiation
q High stability of the RF-oscillator frequency
q High stability of the audio oscillator
q Internal reference voltage
q 12 V supply voltage
P-DSO-20-1
Type
MGM 3000X
MGM 3000X
Ordering Code
Q67000-A5179
Q67006-A5179
Package
P-DSO-20-1 (SMD)
P-DSO-20-1 Tape & Reel (SMD)
Functional Description and Application
The monolithic integrated circuit MGM 3000X is especially suitable as a modulator for
the 48 to 860 MHz frequency range.
Video recorders, cable converters, TV-converter networks, demodulators, video
generators, video security systems, amateur TV-applications and personal computers.
Circuit Description
Oscillator
The RF-oscillator is available at pins 3 - 7. The oscillator operates as a symmetrical
Colpitts circuit. The oscillator chip ground, pin 5, should be connected to ground at the
resonance circuit shielding point. An external oscillator can be injected inductively or
capacitively via pins 3 and 7. The layout of the PCB should be such as to provide a
minimum shielding attenuation between the oscillator pins 3 - 7 and modulator output
pins 15 - 17 of approximately 80 dB.
Semiconductor Group
1
12.94
1 page  
MGM 3000X
Block Diagram
Semiconductor Group
5
5 Page 
MGM 3000X
AC/DC Characteristics (cont’d)
TA = 25 °C; VS = 12 V
Parameter
Symbol Limit Values
Unit
min. typ. max.
Test Condition
Test
Circuit
Setting time for video
blanking signal from
100 % white level to
42 % grey level with
subsequent rise in
grey level to 71 % of
video blanking signal
(due to decontrol
process).
t
0.4 2
10 min
1
Audio
Audio oscillator
frequency range;
unloaded Q factor of
resonance circuit
QU = 25;
fresonance = 5.5 MHz.
fA/OSC
Switch-on, warm-up
drift of oscillator
frequency; TC-value
of capacitor in audio
oscillator circuit is 0,
the drift is only based
on self-heating of
component.
f∆ A/OSC
4
7 MHz
1
5 kHz TA = const.;
1
> 5 s after switching on
Audio signal
f∆ A/OSC
frequency devitation
AM-Audio
5 kHz VS = 12 V ± 10 %
QU = 25
1
AM-mod. factor m 50
70 %
VAF = 90 mVrms
9
AM-mod.; total
harmonic distortion
THDAM
0.5 3
%
Audio preamplifier
input impedance
Z18
25 50 75 kΩ
m = 80 %;
VAF = 117 mVrms;
fAF = 1 kHz
9
1
Semiconductor Group
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet MGM3000X.PDF ] | |
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