INFINEON TDA5667-5

Video Modulator for
FM/AM-Audio
TDA 5667-5
Preliminary Data
Bipolar IC
Features
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FM- and AM-audio modulator
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
P-DIP-18 -5
Type
Ordering Code
Package
TDA 5667-5
Q67000-A5164
P-DIP-18-5
Functional Description and Application
The monolitic integrated circuit TDA 5667-5 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.
Semiconductor Group
1
02.95
TDA 5667-5
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
13-15 of approximately 80 dB.
For optimal residual carrier suppression, the symmetrical mixer outputs at pins 13, 15
should be connected to a matched balanced-to-unbalanced broadband transformer, e.g.
a Guanella transformer with good phase precision at 0o and 180o. 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 10.
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 11, the current pulses of the peak white detector are
filtered through the capacitor which also determines the control time constant. The RFcarrier switches from negative to positive video modulation, when pin 12 is connected
to ground. By varying the value of resistance R at pin 12 between ∞ ... 0 Ω 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 17, 18. The unloaded Q of the resonant circuit must be Q = 25 and the parallel
resistor RT = 8.2 kΩ to ensure a video to audio carrier ratio of 12.5 dB. At the same time,
the capacitative and/or inductive reactance for the resonance frequency should have a
value of XC ≈ XL ≈ 800 Ω.
Via pin 16, 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 16. The video to audio carrier ratio can be changed by connecting
an external voltage to pin 16, which deviates from the internal reference voltage.
Through an additional external dc voltage at pin 16, 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.
Source
The internal reference voltage is available at pin 2 and has to be capacitively blocked
there.
Semiconductor Group
2
TDA 5667-5
Pin Configuration
(top view)
Semiconductor Group
3
TDA 5667-5
Pin Definitions and Functions
Pin No.
Symbol
Function
1
FM-Audio
AF-input for FM-modulation
2
VREF
Internal reference voltage (7.5 V)
3
OSC-Input 1
Symmetrical oscillator input
4
OSC-Out 1
Symmetrical oscillator output
5
OSC-Ground
Oscillator ground
6
OSC-Out 2
Symmetrical oscillator output
7
OSC-Input 2
Symmetrical oscillator input
8
VS
Supply voltage (12 V)
9
N.C.
Not connected
10
Video
Video input with clamping
11
Video-Cap.
Connection for smoothing capacitor for video control
loop
12
Modulation
Switch-over for positive and negative modulation
13
Output 2
Symmetrical RF-output
14
Ground
Ground
15
Output 1
Symmetrical RF-output
16
AM-Audio
Video to audio carrier ratio adjustment and AF-input for
AM-modulation
17
FM-Audio OSC
FM-audio oscillator; symmetrical inputs for tank circuit
18
FM-Audio OSC
FM-audio oscillator; symmetrical inputs for tank circuit
Semiconductor Group
4
TDA 5667-5
Block Diagram
Semiconductor Group
5
TDA 5667-5
Absolute Maximum Ratings
TA = 0 to 70 oC
Parameter
Symbol
Limit Values
min.
typ.
Unit
max.
Supply voltage pin 8
VS
– 0.3
14.5
V
Current from pin 2
–I2
0
2
mA
Voltage at pin 1
Voltage at pin 2
Voltage at pin 10
V1
V2
V10
0
6
0
2
8.5
1.5
V
V
Vpp
Capacitance at pin 2 C2
Capacitance at pin 11 C11
0
0
100
15
nF
µF
Voltage at pin 12
Voltage at pin 13
Voltage at pin 15
Voltage at pin 16
– 0.3
V2
V2
V2-1.5
1.4
VS
VS
V2+1.5
V
V
V
V
V12
V13
V15
V16
Remarks
V2 = 7-8 V
VS = 10-13.5 V
only via C
(max. 1 µF)
VS = 10-13.5 V
According to the application circuit, only the provided circuitry can be connected
to pins 3,4,6,7,17 and 18.
150
oC
125
o
80
K/W
10
13.5
V
Video input frequency fVideo
0
6
MHz
Audio input frequency fAF
0
20
kHz
Output frequency
fQ
30
860
MHz
Ambient temperature
TA
0
70
oC
Audio oscillator
fOSC
4
7
MHz
Voltage at pin 2
Voltage at pin 13,15
V2
V13, 15
6.75
V2
7.75
VS
V
V
Junction temperature
Tj
Storage temperature
Tstg
Thermal resistance
Rth
– 40
C
Operating Range
Supply voltage
Semiconductor Group
VS
6
depending on
the oscillator
circuitry at
pins 3-7
TDA 5667-5
AC/DC-Characteristics
TA = 25 oC; VS = 12 V
Parameter
Symbol
Limit Values
Unit
Test
Condition
Test
Circuit
min.
typ.
max.
15
2.0
20
2.6
26
3.4
mA
mA
I2 = 0 mA
1
6.75
7.25
7.75
V
0 ≤ I2 ≤ 1 mA
1
860
MHz
external circuitry
adjusted to
frequency
Source
Current consumption I8
Current consumption I13 + I15
Reference voltage
V2
Oscillator
Oscillator frequency
range
fOSC
30
Switch-on, warm up drift; (TC-value of capacitor in osc. circuit is 0) drift is referenced only to
selfheating of the component.
∆fOSC
0
– 50
– 500
0
– 200
– 500
Frequency drift as
function of VS
∆fOSC
–150
RF-output
impedance
R13; R15
10
C13 = C15 0.5
150
kHz
Ch 30
kHz
Ch 40
t = 0.5-10 s;
kHz
VS = 10-13.5 V
TA = const.;
Ch 40
1
kΩ
parallel
equivalent circuit
parallel
equivalent circuit
1
1
2.0
pF
TA = const.
1
RF-output voltage
VQ
2.5
4.5
5.5
mVrms Ch 40; video
100% white;
without audiosignal
RF-output phase
α13, 15
140
180
220
deg
RF-output voltage
changes
∆VQ
0
1.5
dB
∆VQ
∆VQ
0
0
1.5
1.5
dB
dB
Intermodulation ratio αIMR
Harmonic wave ratio αO
Semiconductor Group
50
75
35
7
1
1
1
f = 543623 MHz
Ch 30...40
f = 100-300 MHz
f = 48-100 MHz
1
dB
fVC + 1.07 MHz
2
dB
fVC + 8.8 MHz
without video
2
1
1
TDA 5667-5
AC/DC-Characteristics (cont’d)
TA = 25 oC; VS = 12 V
Parameter
Symbol
Limit Values
min.
typ.
Unit
max.
Test
Condition
Test
Circuit
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
αV/A
dB
fVC + fAC
(5.5 MHz)
1
48
dB
1
48
dB
fVC + 2 fAC
(11 MHz)
fVC + 3 fAC
(16.5 MHz)
10
12.5
Harmonic wave ratio αO
35
Harmonic wave ratio αO
42
Video to audio
carrier ratio
15
1
All remaining harmonic waves; multiple of fundamental wave of video carrier, without video
signal, measured with spectrum analyzer; fVC = 523.25-623.25 MHz; pin 12 open
α
15
dB
Residual carrier
suppression
αR
32
dB
Ch 30...40
3
Signal-to-noise in
video; unmodulated
audio carrier
αN/V
48
74
dB
Ch 30...40
4
αA/V
49
62
dB
4
FM-modulation of
audio carrier
αA/V
48
60
dB
Ch 30...40,
mA = 90%
Ch 30...40
Unweighted AM-
αV/A
48
54
dB
Unweighted FMinterference level
ratio video in audio
αV/A
48
54
dB
Signal-to-noise ratio
of audio oscillator
αN/A
αN/A
48
48
54
54
dB
dB
AM unmodulated
FM-audio carrier
5
5
Video input current
at pin 10
– I10
0
1
µA
C10 ≤ 100 nF
1
Video input voltage
at pin 10
V10
0.7
1.4
Vpp
C10 ≤ 100 nF
1
Interference product
ratio audio in video
AM-modulation
1
4
Ch 39; test picture 5
FuBK
Ch 39; test picture 5
FuBK
Video
Semiconductor Group
8
TDA 5667-5
AC/DC-Characteristics (cont’d)
TA = 25 oC; VS = 12 V
Parameter
Symbol
Limit Values
Unit
Test
Condition
Test
Circuit
staircase signal
at video input;
VVideo = 1 Vpp
6
∆VVideo = 1 Vpp
6
min.
typ.
max.
60
70
80
%
Modulation depth
mD/N
Stability of mod.
depth
∆mD
1
± 2.5
%
∆mD
1
± 2.5
%
TA = 0...60 oC
6
∆mD
1
± 2.5
%
VS = 10...13.5 V
6
Differential gain
αdif
10
%
Differential phase
Φdif
15
deg
± 3 dB;
7
measured with
measurement
demodulator,
video test signals
and vector scope
7
Amplitude response of video signal; VVideo = 1 Vpp with additional modulation f = 15 kHz-5MHz
sine signal between black and white
αV
0
1.5
dB
8
Period of time 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
6
t
50
µs
C at pin 11 = 10 µF; 1
I leakage ≤ 2 µA
Setting time for video signal change from 0 Vpp to 1.4 Vpp; video blanking signal content is
uniform white level
120
t
500
µs
1
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
Semiconductor Group
4
7
9
MHz
1
TDA 5667-5
AC/DC-Characteristics (cont’d)
TA = 25 oC; VS = 12 V
Parameter
Symbol
Limit Values
min.
typ.
Unit
max.
Test
Condition
Test
Circuit
Switch-on, warm-up drift of oscillator frequency; TV-value of capacitor in audio oscillator circuit
is 0, the drift is only based on self-heating of component
Audio signal
frequency deviation
∆ fA/OSC
5
15
kHz
TA = const.;
1
∆ fA/OSC
5
10
kHz
VS = 10.0-13.5 V;
Qu = 25
1
30
40
%
VAF = 45 mVrms
9
0.5
3
%
m = 80%;
VAF = 117 mVrms
fAF = 1 kHz
9
50
75
kΩ
1
AM-Audio
AM-mod. factor
m
20
AM-mod.; total
harmonic distortion
THDAM
Audio preamplifier
input impedance
Z16
AM-audio modulator
input voltage
VAF
132
mVrms m = 90%;
fAF = 1 kHz
9
Residual carrier FM;
AM-operation
∆f
20
Hz
without AM-audio
signal QU = 25
1
FM-mod.; total
harmonic distortion
THDFM
0.6
1.5
%
V1 = 150 mVrms
9
FM-mod.; static
mod. characteristic
∆ fA/OSC
± 150
± 210
± 270
kHz
∆VAF = V1-V2 =
±1V
1
FM-mod.; dynamic
mod. characteristic
∆ fA/OSC/
∆VAF
0.25
0.32
0.39
kHz/
mV
1
Audio preamplifier
input impedance
(dynamic)
Z1
200
kΩ
1
25
FM-Audio
Semiconductor Group
10
TDA 5667-5
Test Circuit 1
Test and Measurement Circuit for FM-Audio Carrier and Negative Video
Modulation
Semiconductor Group
11
TDA 5667-5
Test Circuit 2
Description of the Measurement Configuration to Measure the 1.07-MHz Moire
CC-level lies below the activation point and has been set to provide a ratio of 17 dB with respect to
the video carrier.
f VC = 623.25 MHz
Semiconductor Group
12
TDA 5667-5
Test Circuit 3
Description of the Measurement Configuration to Measure the Residual Carrier
Suppression
Semiconductor Group
13
TDA 5667-5
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
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.
Semiconductor Group
14
TDA 5667-5
Test Circuit 5
Description of the Measurement Configuration to Measure and/or Noise in Audio
Calibration:
Measuring:
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.
1) The AF-signal is switched off and the FuBK-video signal is connected to the video
input with Vvid = 1 Vpp. The audio level in relation to the AF-reference calibration
level is measured as ratio aV/A.
2) AF- and video signal are switched off. The noise ratio in relation to the AFreference calibration level is measured as signal-to-noise ratio in the audio signal
aN/A.
Semiconductor Group
15
TDA 5667-5
Test Circuit 6
Description of the Measurement Configuration to Measure the Modulation Depth
for Positive and Negative Modulation
Calibration:
A zero reference signal with the TV-measuring receiver is given to the video signal.
A video signal with Vvid = 1 Vpp is connected to the video input.
Measuring:
1) Modulation depth mD/N for negative modulation: pin 12 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 12 to ground, range peak
white value – sync level in relation to range zero reference – peak white value gives
mD/P.
Semiconductor Group
16
TDA 5667-5
Test Circuit 7
Description of the Measurement Configuration to Measure the Differential Gain
and Phase
Semiconductor Group
17
TDA 5667-5
Test Circuit 8
Description of the Measurement Configuration to Measure the Video Amplitude
Response
Semiconductor Group
18
TDA 5667-5
Test Circuit 9
Description of the Measurement Configuration to Measure the Harmonic
Distorsion Factor and AM-Input Voltage
Semiconductor Group
19
TDA 5667-5
Application Circuit
Semiconductor Group
20
TDA 5667-5
Diagram
Function of Video Signal Connection
a) Demodulated RF-output video signal V13/15rms = f (V10rms); fmod = 16 kHz
b) V11 = f (V10rms)
Semiconductor Group
21
TDA 5667-5
GPD05586
Plastic Package, P-DIP-18-5
(Plastic Dual In-Line Package)
Sorts of Packing
Package outlines for tubes, trays etc. are contained in our
Data Book “Package Information”
Dimensions in mm
Semiconductor Group
22