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Video Modulator for FM/AM-Audio
MGM 3000X
Bipolar IC
Features
q q q q q q q q q q q q
FM- and AM-audio modulator Audio carrier output for suppression of harmonics Sync level clamping of video input signal Controlling of peak white value Continuous adjustment of modulation depth for positive or negative values Symmetrical mixer output with separate ground area Symmetrical oscillator with separate RF-ground Low spurious radiation High stability of the RF-oscillator frequency High stability of the audio oscillator Internal reference voltage 12 V supply voltage Ordering Code Q67000-A5179 Q67006-A5179
P-DSO-20-1
Type MGM 3000X MGM 3000X
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
MGM 3000X
For optimal residual carrier suppression, the symmetrical mixer outputs at pins 15, 17 should be connected to a matched balanced-to-unbalanced broadband transformer, e.g. a Guanella transformer with good phase precision at 0 and 180 . The transmission loss should be less than 3 dB. In addition, an LC-low pass filter combination is required at the output. The cut-off frequency of the low pass filter combination must exceed the maximum operating frequency. Video The video signal with the negative synchronous level is capacitively connected to pin 12. The internal clamping circuit is referenced to the synchronizing level. Should the video signal change by 6 dB, this change will be compensated by the resonance circuit which is set by the peak white value. At pin 13, the current pulses of the peak white detector are filtered through the capacitor which also determines the control time constant. The RF-carrier switches from negative to positive video modulation, when pin 14 is connected to ground. By varying the value of resistance R at pin 14 between ... 0 the modulation depth can be increased from 70 % to 100 % when the modulation is negative and decreased from 100 % to 70 % when the modulation is positive. Audio Via pin 1, the audio signal is capacitively coupled to the AF-input for the FM-modulation of the oscillator. A parallel resonance circuit is connected to the audio carrier oscillator at pins 19, 20. The unloaded Q of the resonant circuit must be Q = 25 and the parallel resistor RT = 6.8 k to ensure a video to audio carrier ratio of 12.5 dB. At the same time, capacitative and/or inductive reactance for the resonance frequency should have a value of XC XL 800 . Via pin 18, the audio signal is capacitively coupled to the AF-input for the AM-modulation of the oscillator. This signal is forwarded to a mixer which is influenced by the AMmodulation input of pin 18. The video to audio carrier ratio can be changed by connecting an external voltage to pin 18, which deviates from the internal reference voltage. Through an additional external dc voltage at pin 18, the set AM-modulation index can be changed by overriding the internally adjusted control voltage for a fixed AM-modulation index. At the output of the above described mixer the FM and/or AM modulated audio signal is added to the video signal and mixed with the oscillator signal in the RF-mixer. For optimal suppression of harmonics of the audio carrier an audio filter should be connected between pin 10 and 11. Source The internal reference voltage is available at pin 2 and has to be capactively blocked there.
Semiconductor Group
2
MGM 3000X
Pin Configuration (top view)
Semiconductor Group
3
MGM 3000X
Pin Definitions and Functions Pin No. Symbol 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 FM-Audio Function AF-input for FM-modulation Internal reference voltage (7.5 V) Symmetrical oscillator input Symmetrical oscillator output Oscillator ground Symmetrical oscillator output Symmetrical oscillator input Supply voltage (12 V) Not connected Audio output; symmetrical inputs for audio filter Audio output; symmetrical inputs for audio filter Video input with clamping Connection for smoothing capacitor for video control loop Switch-over for positive and negative modulation Symmetrical RF-output Ground Symmetrical RF-output Video to audio carrier ratio adjustment and AF-input for AM-modulation FM-audio oscillator, symmetrical inputs for tank circuit FM-audio oscillator, symmetrical inputs for tank circuit
VREF
OSC-Input 1 OSC-Out 1 OSC-Ground OSC-Out 2 OSC-Input 2
VS
N.C. Audio Out 1 Audio Out 2 Video Video-Cap. Modulation Output 2 Ground Output 1 AM-Audio FM-Audio OSC FM-Audio OSC
Semiconductor Group
4
MGM 3000X
Block Diagram
Semiconductor Group 5
MGM 3000X
Absolute Maximum Ratings TA = 0 to 70 C Parameter Symbol Limit Values min. Supply voltage pin 8 Current from pin 2 Voltage at pin 1 Voltage at pin 2 Voltage at pin 12 Capacitance at pin 2 Capacitance at pin 13 Voltage at pin 14 Voltage at pin 15 Voltage at pin 17 Voltage at pin 18 typ. max. 14.5 2 2 8.5 1.5 100 15 1.4 13.5 13.5 V2 + 1.5 V mA V V Vpp nF F V V V V Unit Remarks
VS
- I2
- 0.3 0 0 6 0 0 0 - 0.3
V2 = 7-8 V, VS = 10-13.5 V
V1 V2 V10 C2 C13 V14 V15 V17 V18
only via C (max.1 F)
V2 V2 V2 - 1.5
VS = 10-13.5 V
According to the application circuit, only the provided circuitry can be connected to pins 3, 4, 6, 7, 10, 11, 18 and 20. Junction temperature Storage temperature Thermal resistance Operating Range Supply voltage Video input frequency Audio input frequency Output frequency
Tj Tstg Rth
- 40
150 125 80
C C K/W
VS fVideo fAF fQ
10 0 0 30
13.5 6 20 860
V MHz kHz MHz depending on the oscillator circuitry at pins 3-7 C
Ambient temperature
TA
0
80
Semiconductor Group
6
MGM 3000X
Absolute Maximum Ratings (cont'd) TA = 0 to 70 C Parameter Symbol Limit Values min. Audio oscillator Voltage at pin 2 Voltage at pin 15, 17 typ. max. 7 7.50 MHz V V Unit Remarks
fOSC V2 V15, 17
4 7
V2
VS
AC/DC Characteristics TA = 25 C; VS = 12 V
Parameter Symbol Limit Values min. Source Current consumption Current consumption Reference voltage Oscillator Oscillator frequency range Switch-on, warm up drift TC-value of capacitor in osc. circuit is 0; drift is referenced only to selfheating of the component. Frequency drift as function of VS RF-output impedance typ. max. Unit Test Condition Test Circuit
I8 I15 + I17 V2
15 2.0 7.00
20 2.6 7.25
26 3.4 7.50
mA mA V
I2 = 0 mA
0 I2 1 mA
1
1
fOSC
fOSC
30
860
MHz
external circuitry adjusted to frequency
t = 0.5-10 s; TA = const.
0 0 - 50 - 500 kHz - 200 - 500 kHz Ch 30 Ch 40 1 1
fOSC
- 150
150
kHz
VS = 10-13.5 V TA = const.; Ch 40
parallel equivalent circuit parallel equivalent circuit
1
R15; R17 C15; C17
10 0.5 1 2.0
k pF
1 1
Semiconductor Group
7
MGM 3000X
AC/DC Characteristics (cont'd) TA = 25 C; VS = 12 V
Parameter Symbol Limit Values min. RF-output voltage typ. 4.5 max. 5.5 mVrms Ch 60; video 100 % white; without audio- signal 1 Unit Test Condition Test Circuit
VQ
2.5
RF-output phase RF-output voltage changes
a15, 17
VQ
140 0
180
220 1.5
deg dB
f = 743.25823.25 MHz f = 80 MHz; Ch 55-65 f = 100-300 MHz f = 48-100 MHz
1
VQ VQ Intermodulation ratio
0 0 60 75
1.5 1.5
dB dB dB
1 1 2
aIMR
fVC + 1.07 MHz fVC + 1.57 MHz fVC + 2.07 MHz fVC + 8.8 MHz fVC + 13.29 MHz fVC + 17.72 MHz,
without video
Harmonic wave ratio
aO
60
dB
2
13, 14, 15 unmodulated video and audio carrier, measured with the spectrum analyzer as difference between video carrier signal level and sideband signal level; loaded Q factor QL of the audio oscillator resonance circuit adjusted by RP to provide the required video to audio carrier ratio of 12.5 dB; QU = 25. Video to audio carrier ratio Harmonic wave ratio Harmonic wave ratio
aV/A aO aO
10
12.5
15
dB
fVC + fAC (5.5 MHz) fVC + 2fAC (11 MHz) fVC + 3fAC (16.5 MHz)
1
60 80
dB dB
1 1
Semiconductor Group
8
MGM 3000X
AC/DC Characteristics (cont'd) TA = 25 C; VS = 12 V
Parameter Symbol Limit Values min. All remaining a harmonic waves; multiple of fundamental wave of video carrier, without video signal, measured with spectrum analyzer; fVC = 523.25623.25 MHz; pin 14 open. Residual carrier suppression Signal-to-noise in video; unmodulated audio carrier Interference product ratio audio in video AM-modulation FM-modulation of audio carrier Unweighted AM Unweighted FM Interference level ratio video in audio Signal-to-noise ratio of audio oscillator Video Video input current at pin 12 Video input voltage at pin 12 15 typ. max. dB 1 Unit Test Condition Test Circuit
aR aN/V
32
dB
Ch 30 ... 40
3
48
74
dB
Ch 60
4
aA/V aA/V aV/A aV/A
49 48
62 60
dB dB
Ch 60; mA = 90 % Ch 60; 35 kHz Ch 39; test picture FuBK Ch 39; test picture FuBK
4 4
48 48
54 54
dB dB
5 5
aN/A aN/A
48 48
54 54
dB dB
AM unmodulated FM video carrier
5 5
- I12 V12
0
1
A Vpp
C12 100 nF C12 100 nF
1
0.7
1.4
1
Semiconductor Group
9
MGM 3000X
AC/DC Characteristics (cont'd) TA = 25 C; VS = 12 V
Parameter Symbol Limit Values min. Modulation depth typ. max. 90 % staircase signal at video input; VVideo = 1 Vpp 6 Unit Test Condition Test Circuit
mD/N mD/P
70
80 1 1 1
98 2.5 2.0 2.0 10 15
% % % % % deg measured with measurement demodulator, video test signals and vector scope VVideo = 1 Vpp 3 dB; 6 6 TA = 0-60 C 6 VS = 10-13.5 V 7 7
Stability of mod. depth mD Stability of mod. depth mD Stability of mod. depth mD Differential gain Differential phase
adif
dif
Amplitude response of video signal; VVideo = 1 Vpp with additional modulation f = 15 kHz-5 MHz sine signal between black and white.
aV
0
1.5
dB
8
Period of time t required for peak white detector to reach steady state for full modulation depth with 1-white pulse per half frame when control is already in the steady state. Setting time for video signal change from 0 Vpp to 1.4 Vpp, video blanking signal content is uniform white level. t
6
50
s
C at pin 13 = 10 F Ileakage 2 A
1
120
500
s
1
Semiconductor Group
10
MGM 3000X
AC/DC Characteristics (cont'd) TA = 25 C; VS = 12 V
Parameter Symbol Limit Values min. 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). Audio Audio oscillator frequency range; unloaded Q factor of resonance circuit QU = 25; fresonance = 5.5 MHz. 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. Audio signal frequency devitation AM-Audio AM-mod. factor AM-mod.; total harmonic distortion fA/OSC 4 7 MHz 1 t 0.4 typ. 2 max. 10 min 1 Unit Test Condition Test Circuit
fA/OSC
5
kHz
TA = const.;
> 5 s after switching on
1
fA/OSC
5
kHz
VS = 12 V 10 % QU = 25
1
m THDAM
50 0.5
70 3
% %
VAF = 90 mVrms m = 80 %; VAF = 117 mVrms; fAF = 1 kHz
9 9
Audio preamplifier input impedance
Z18
25
50
75
k
1
Semiconductor Group
11
MGM 3000X
AC/DC Characteristics (cont'd) TA = 25 C; VS = 12 V
Parameter Symbol Limit Values min. AM-audio modulator input voltage Residual carrier FM; AM-operation FM-Audio FM-mod.; total harmonic distortion FM-mod.; static mod. characteristic FM-mod.; dynamic mod. characteristic typ. 132 max. mVrms Unit Test Condition Test Circuit 9
VAF
f
m = 90 %; fAF = 1 kHz
without AM-audio signal QU = 25
20
Hz
1
THDFM
fA/OSC fA/OSC/ VAF
0.6
1.5
%
V1 = 150 mVrms
VAF = V1 - V2 = 1 V
9
150 210 270 kHz 0.30 0.25 0.36 0.33 0.36 0.30 0.44
1
kHz/mV BIN 1 kHz/mV BIN 2 kHz/mV BIN 3 k
1
Audio preamplifier input impedance (dynamic); FM-operation Overshoot Overshoot
Z1
200
1
1
%
15-kHz video signal
Semiconductor Group
12
MGM 3000X
Test Circuit 1 Test and Measurement Circuit for AM- and FM-Audio Carrier and Negative Video Modulation
Semiconductor Group 13
MGM 3000X
CC-level lies below the activation point and has been set to provide a ratio of 17 dB with respect to the video carrier. fVC = 623.25 MHz Test Circuit 2 Description of the Measurement Configuration to Measure the Moire
Semiconductor Group 14
MGM 3000X
Test Circuit 3 Description of the Measurement Configuration to Measure the Residual Carrier Suppression
Semiconductor Group 15
MGM 3000X
Calibration:AF-signals are switched off, video signal is present at video input, modulation measurement device set at AM is adjusted to video carrier; filter: 300 Hz ... 20 kHz; detector: (P + P)/2; Wave analyzer at video signal level (16 kHz) adjusted and resultant level as reference aV defined. 1. Measurement of audio interference product ratio in video while the audio carrier FM modulated: AF-signal is connected to FM-audio input; video signal is present at video input; Modulation measurement device set at AM; filter: 300 Hz ... 20 kHz; detector: (P + P)/2; the automatic RF-level position of the measurement device is switched off; wave analyzer at video signal level 1 kHz or 2 kHz or 3 kHz adjusted and resultant level is set to aA. The audio noise ratio in video results from aA/V = aA - aV (dB). 2. Measurement of signal-to-noise ratio in video without FM-modulation of audio carrier: AF-signals are switched off; video signal is switched on; modulation measurement device set at AM; filter: 300 Hz ... 3 kHz; detector; RMS x 2; Wave analyzer at video signal level (16 kHz) detuned; read out in dB to reference level of calibration is aN/V; 3. The noise limit of the measurement device is approx. 85 dB.
Test Circuit 4 Description of the Measurement Configuration to Measure the Audio and/or Noise in Video during FM- and AM-Modulation of the Audio Carrier
Semiconductor Group 16
MGM 3000X
Calibration: AF-signal of f = 1 kHz, corresponding with a nominal deviation of 30 kHz, is connected to the audio input, and the demodulated AF-reference level at the audio measurement device is defined as 0 dB. No video signal is present. Measuring: 1. The AF-signal is switched off and the FuBK-video signal is connected to the video input with VVideo = 1 Vpp. The audio level is relation to the AF-reference calibration level is measured as ratio aV/A. 2. AF-and video signals are switched off. The noise ratio in relation to the AF-reference calibration level is measured as signal-to-noise ratio in the audio signal aN/A. Test Circuit 5 Description of the Measurement Configuration to Measure the Video and or Noise in Audio
Semiconductor Group 17
MGM 3000X
Calibration: A zero reference signal with the TV measuring receiver is given to the video signal. A video signal with VVideo = 1 Vpp is connected to the video input. Measuring: 1. Modulation depth mD/N for negative modulation: pin 14 open, range peak white value-sync level in relation to range zero reference-sync level gives mD/N. 2. Modulation depth mD/P for positive modulation: pin 14 to ground, range peak white value-sync level in relation to range zero reference-peak white value gives mD/P. Test Circuit 6 Description of the Measurement Configuration to Measure the Modulation Depth for Positive and Negative Modulation
Semiconductor Group 18
MGM 3000X
Test Circuit 7 Description of the Measurement Configuration to Measure the Differential Gain and Phase
Semiconductor Group 19
MGM 3000X
Test Circuit 8 Description of the Measurement Configuration to Measure the Video Amplitude Response
Semiconductor Group 20
MGM 3000X
Test Circuit 9 Description of the Measurement Configuration to Measure the Harmonic Distorsion Factor and AM-Input Voltage
Semiconductor Group 21
MGM 3000X
Diagram Function of Video Signal Connection. a) Demodulated RF-output video signal V15/17rms = f(V12rms); fmod = 16 kHz b) V13 = f(V12rms)
Semiconductor Group
22
MGM 3000X
Plastic Package, P-DSO-20-1 (SMD) (Plastic Dual Small Outline)
Sorts of Packing Package outlines for tubes, trays etc. are contained in our Data Book "Package Information" SMD = Surface Mounted Device Semiconductor Group 23
Dimensions in mm
GPS05094

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