TEMIC TDA4472-A

TELEFUNKEN Semiconductors
TDA4472-A
Video-IF (VIF) with FPLL Demodulation and Quasi Parallel
Sound (QPS) Processing
Description
The TDA4472 is an integrated bipolar circuit for
video/sound IF (VIF/SIF) signal processing in TV/VCR
and multimedia applications.
The circuit processes TV video IF signals with negative
modulation (e.g. B/G standard) and the FM/NICAM
sound IF signals.
Features
5 V supply voltage; low power consumption
Tuner AGC with adjustable take over point
Active carrier generation by FPLL principle
(frequency-phase-locked-loop) for true synchronous
demodulation
Alignment-free quasi parallel sound (QPS) mixer for
FM/NICAM sound IF signals
Very linear video demodulation, good pulse response
and excellent intermodulation figures
VCO circuit is operating on picture carrier frequency
Alignment-free AFC without external reference
circuit
VIF-AGC with peak sync detection
Gain controlled intercarrier output signal
(supports digital sound processing systems)
Separate SIF-AGC with average detection
Two independent SIF inputs
Package and pinning is fully compatible with the
multistandard version TDA4470, simplifies the
design of an universal IF module
Package
28 pin shrink-dual-inline-plastic (SDIP28)
Rev. A1: 26.07.1995
1 (14)
TDA4472-A
TELEFUNKEN Semiconductors
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18
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VIF amp
20
0°
FPL
L
VIF
AFC
switch
VCO
26
6
ÏÏ
Loop
filter
Offset
comp.
(optional)
90°
ÏÏ
21
19
VCO
+
phase shift
AFC
Video
det.
8
12
10
Take over point
AGC
(VIF)
23
VS
Tuner
AGC
Supply
17
CRef
FM det.
24
28
Ï
Input switch
Video
Ï ÏÏ
Ï
Ï
27
SIF 2
AFC
4,9,16
11
Tuner
22
Ï
Ï
Ï
7
CAGC
Ï
Ï
Intercarrier
(FM / NICAM)
SIF amp
3
1
SIF 1
2
AGC
(SIF)
5
CAGC
94 8719
Figure 1. Block diagram
2 (14)
Rev. A1: 26.07.1995
TDA4472-A
TELEFUNKEN Semiconductors
Circuit Description
Vision IF Amplifier
The video IF signal (VIF) is fed through a SAW filter to
the differential input (Pin 6-7) of the VIF amplifier. This
amplifier consists of three AC-coupled amplifier stages.
Each differential amplifier is gain controlled by the
automatic gain control (VIF-AGC). Output signal of the
VIF amplifier is applied to the FPLL carrier generation
and the video demodulator.
Tuner- and VIF-AGC
At Pin 8 the VIF-AGC charges/discharges the AGC
capacitor to generate a control voltage for setting gain of
VIF amplifier and tuner in order to keep the video output
signal at a constant level. Therefore in case of all negative
modulated signals the sync level of the demodulated
video signal is the criterion for a fast charge/discharge of
the AGC capacitor. The control voltage (AGC voltage at
Pin 8) is transferred to an internal control signal, and is
fed to the tuner AGC to generate the tuner AGC current
at Pin 11 (open collector output). Take over point of the
tuner AGC can be adjusted at Pin 10 by a potentiometer
or an external DC voltage (from interface circuit or
microprocessor).
FPLL, VCO and AFC
component of the VCO signal. The video demodulator is
designed for low distortion and large bandwidth. The
demodulator output signal passes an integrated low pass
filter for attenuation of the residual vision carrier and is
fed to the video amplifier. The video amplifier is realized
by an operational amplifier with internal feedback and
8 MHz bandwidth (–3 dB). An additional noise clipping
is provided. The video signal is fed to VIF-AGC and to the
video output buffer. This amplifier with 6 dB gain offers
easy adaption of the sound trap. For nominal video
IF modulation the video output signal at Pin 12 is 2 Vpp.
Sound IF Amplifier and SIF-AGC
The SIF amplifier is nearly identical with the 3-stage
VIF amplifier. Merely the first amplifier stage exists
twice and is switchable by a control voltage at pin 3.
Therefore with a minimal external expense it is possible
to switch between two different SAW filters. Both
SIF inputs features excellent cross-talk attenuation and
an input impedance which is independent from the
switching condition.
The SIF-AGC is related to the average level of the FMcarrier and controls the SIF amplifier to provide a
constant SIF signal to the QPS mixer.
The FPLL circuit (frequency phase locked loop) consists
of a frequency and phase detector to generate control voltage for the VCO tuning. In the locked mode the VCO is
controlled by the phase detector and in unlocked mode the
frequency detector is superimposed. The VCO operates
with an external resonance circuit (L and C parallel) and
is controlled by internal varicaps.
Quasi-Parallel-Sound (QPS) Mixer
The VCO control voltage is also converted to a current
and represents the AFC output signal at Pin 22. A practicable VCO alignment of the external coil is the
adjustment to zero AFC output current at Pin 22. At centre
frequency the AFC output current is equal to zero. The
optional potentiometer at Pin 26 allows an offset
compensation of the VCO phase for improved sound
quality (fine adjustment). Without a potentiometer (open
circuit at Pin 26) this offset compensation is not active.
AFC Switch
The QPS mixer is realized by a multiplier. The SIF signal
(FM or NICAM carrier) is converted to the intercarrier
frequency by the regenerated picture carrier (quadrature
signal) which is provided from the VCO. The intercarrier
signal is fed via an output amplifier to Pin 24.
The AFC output signal at Pin 22 can be controlled by a
switching voltage at Pin 19. It is possible to switch off the
AFC.
VCR Mode
The oscillator signal passes a phase shifter and supplies
the in-phase signal (0°C) and the quadrature signal
(90°C)of the generated picture carrier.
For the VCR mode in a TV set (external video source
selected) it is recommendable to switch off the IF circuit.
With an external switching voltage at Pin 6 or 7 the
IF amplifiers are switched off and all signal output levels
at Pin 12, 24 are according to the internal DC voltage.
Video Demodulation and Amplifier
Internal Voltage Stabilizer
The video IF signal, which is applied from the gain
controlled IF amplifier, is multiplied with the inphase
The internal bandgap reference ensures constant performance independent of supply voltage and temperature.
Rev. A1: 26.07.1995
3 (14)
TDA4472-A
TELEFUNKEN Semiconductors
Pin Description
Vi,SIF1
1
Vi,SIF1
2
28
27
Vi,SIF2
3
26
Rcomp
GND
4
25
NC
CAGC
5
24
Vo,FM
Vi,VIF
6
23
VS
Vi,VIF
7
22
VAFC
CAGC
8
GND
9
TDA4472
VSW
21
VVCO
20
VVCO
19
Rtop
10
Itun
11
18
LF
Vo,vid
12
17
Cref
NC
13
16
GND
NC
14
15
94 8835
Figure 2. Pin configuration
4 (14)
Vi,SIF2
Vsw
NC
Pin
Symbol
Function
1, 2
Vi, SIF1
SIF1 input (symmetrical)
3
VSW
Ground
4
GND
Input selector switch
5
CAGC
SIF-AGC (time constant)
6, 7
Vi, VIF
VIF input (symmetrical)
8
CAGC
VIF-AGC (time constant)
9
GND
Ground
10
Rtop
Take over point, tuner AGC
11
Itun
Tuner AGC output current
12
Vo,vid
13
NC
Not connected
14
NC
Not connected
15
NC
Not connected
16
GND
17
Cref
Internal reference voltage
18
LF
Loop filter
19
VSW
AFC switch
20, 21
Vvco
VCO circuit
22
VAFC
AFC output
Video output
Ground
23
VS
24
VO, FM
Supply voltage
25
NC
26
Rcomp
Offset compensation
27, 28
Vi, SIF2
SIF 2 input (symmetrical)
Intercarrier output
Not connected
Rev. A1: 26.07.1995
TDA4472-A
TELEFUNKEN Semiconductors
Absolute Maximum Ratings
Reference point pin 4 (9, 16), unless otherwise specified
Parameters
Supply voltage
Pin 23
Supply current
Pin 23
Power dissipation, VS = +9 V
Output currents
Pin 12, 24, 25
External voltages
Pin 1, 2, 5, 6, 7, 8, 10, 12,
Pin 17, 18, 24, 26, 27, 28
Pin 20, 21
Pin 11
Pin 3, 19, 22
Junction temperature
Storage temperature
Electrostatic handling *) all pins
*)
Symbol
VS
IS
P
Iout
Vext
Value
9.0
75
675
5
+4.5
Unit
V
mA
mW
mA
V
Tj
Tstg
VESD
+3.5
+13.5
VS
+125
–25 to +125
±300
V
V
V
°C
°C
V
Symbol
VS
Tamb
Value
4.5 to 9.0
0 to +85
Unit
V
°C
Symbol
RthJA
Value
55
Unit
K/W
Machine model in accordance with ESD S5.2 standard.
Operating Range
Parameters
Supply voltage range
Ambient temperature
Pin 23
Thermal Resistance
Parameters
Thermal resistance:
junction-ambient, when soldered to PCB
Electrical Characteristics
VS = +5 V, Tamb = +25°C; reference point pin 4 (9, 16), unless otherwise specified.
Parameters
DC-supply
Supply voltage
Supply current
VIF-input
Input sensitivity
(RMS value)
Input impedance
Input capacitance
VIF-AGC
IF gain control range
AGC capacitor
Switching voltage:
VCR mode
Switching current:
VCR mode
Rev. A1: 26.07.1995
Test Conditions / Pins
Pin 23
Symbol
Min.
Typ.
Max.
Unit
VS
IS
4.5
5.0
65
9.0
75
V
mA
120
Veff
Pin 6-7
for FPLL locked
vin
80
see note 1
see note 1
Rin
Cin
1.2
2
k
pF
65
2.2
4.0
dB
F
V
50
A
Pin 8
see note 2
Gv
CAGC
VSW
see note 2
ISW
60
5 (14)
TDA4472-A
Parameters
Tuner-AGC
Available tuner-AGC
current
Allowable output voltage
IF slip-tuner AGC
IF input signal for minimum take over point
IF input signal for maximum take over point
Variation of the take over
point by temperature
FPLL and VCO
Max. oscillator frequency
Vision carrier capture range
Oscillator drift (free running) as function of temperature
Video output
Output current – source
– sunk
Output resistance
Video output signal
Sync level
Zero carrier level
(ultra white level)
Supply voltage influence
on the ultra white level
Video bandwidth (–3 dB)
Video frequency response
over the AGC range
Differential gain error
Differential phase error
Intermodulation
f = 1.07 MHz
Video signal to noise ratio
Residual vision carrier fundamental wave 38.9 MHz
and second harmonic
77.8 MHz
Lower limiting level
Upper limiting level
Ripple rejection
AFC output
Control slope
Frequency drift by temperature
6 (14)
TELEFUNKEN Semiconductors
Test Conditions / Pins
Symbol
Min.
Pin 10, 11 see note 3
Itun
1
current Itun 10% to 90%
Rtop = 10 k (Vtop = 4.5 V)
Rtop = 0 (Vtop = 0.8 V)
V11
∆GIF
vin
0.3
vin
40
∆Tamb = 55°C
∆vin
VIF-AGC: Gv = 46 dB
Pin 18, 20, 21, 26
for carrier generation
fvco
fvco = 38.9 MHz
∆fcap
Cvco = 6.8 pF
see note 4,
∆f/∆T
∆Τamb = 55°C,
Cvco = 6,8 pF,
fvco = 38.9 MHz
Pin 12
±I12
Typ.
Max.
Unit
2
4
mA
8
13.5
10
4
V
dB
mV
mV
2
70
±1.5
V8 = 3 V
Rout
vo,vid
Vsync
VDC
1.8
∆V/V
RL ≥ 1 k, CL ≥ 50 pF
see note 5
weighted, CCIR-567
below sync level
above ultra white level
see note 1 /pin 23/pin 12
Pin 22
B
∆Β
DG
DP
aIM
S/N
vres1
∆Vlim1
∆Vlim2
RR
∆I/∆f
related to the picture
carrier frequency
2.0
1.2
3.4
–0.3
%
5
3
100
2.2
mA
mA
V
V
V
1
6
%/V
8
2.0
52
56
2
2
60
60
2
5
5
10
400
600
MHz
dB
%
deg
dB
dB
mV
mV
mV
dB
35
0.7
0.25
dB
MHz
MHz
±2
2
see note 1
peak to peak value
3
0.6
A/kHz
%
Rev. A1: 26.07.1995
TDA4472-A
TELEFUNKEN Semiconductors
Parameters
Output voltage
upper limit
lower limit
Output current
AFC switch
Control voltage:
AFC ”off”
AFC ”on”
Switching current
SIF inputs
Input sensitivity
(RMS value)
Input impedance
Input capacitance
SIF – AGC
Pin 5
IF gain control range
AGC capacitor
Intercarrier output-FM
DC output voltage
Output resistance
Sound IF output voltage,
RMS value (5.5 MHz output voltage)
Weighted signal to noise ratio: (CCIR 468)
Ripple rejection
SIF input selector switch
Control voltage
input 1 active
input 2 active
Switching current
Rev. A1: 26.07.1995
Test Conditions / Pins
Symbol
Min.
VAFC
VS-0.4
Typ.
Max.
Unit
0.4
V
V
mA
±0.2
IAFC
Pin 19
see note 6
output signal
at pin 24/25: –3 dB
see note 1
see note 1
VSW
0
3.5
±100
ISW
Pin 1-2, 27-28
vin
80
Rin
Cin
0.8
VS
V
V
A
120
V
1.2
2
k
pF
65
10
dB
F
VDC
Rout
vout
2
150
250
V
mV
Black screen: Channel 1/2
Grid pattern: Channel 1/2
Grey screen 50%: Channel
1/2
see note 1 /pin 23/pin24
Pin 3
S/N
S/N
S/N
60/58
54/52
60/57
dB
dB
dB
RR
35
see note 8
VSW
2.0
0
Gv
GAGC
Pin 24
see note 1
vin = 10 mV
60
see note 7
Ref. signal:
vin = 10 mV,
FM dev. = ±27 kHz,
fmod = 1 kHz,
tested with the double
FM demod. U2860B,
B/G modulated VIF signal
ISW
dB
VS
0.8
±100
V
V
A
7 (14)
TDA4472-A
TELEFUNKEN Semiconductors
Notes
1. This parameter is given as an application information
and not tested during production.
2. In VCR mode the VIF- and SIF path is switched off.
3. Adjustment of turn over point (delayed tuner AGC)
with external resistor Rtop or external voltage Vtop
possible.
4. The oscillator drift is related to the picture carrier frequency, at external temperature-compensated LC
circuit.
5. a (1.07) = 20 log (4.43 MHz component/1.07 MHz
component); a (1.07) value related to black-white
signal input signal conditions:
picture carrier
0 dB
colour carrier
–6 dB
sound carrier
–24 dB
Intercarrier
(FM/NICAM)
SIF 2
6. Without control voltage at pin 19 the ”on” mode is
automatically selected.
7. Picture carrier PC = 38.9 MHz; sound carrier
SC1 = 33.4 MHz, SC2 = 33.16 MHz;
PC/SC1 = 13 dB; PC/SC2 = 20 dB; PC unmodulated
(equivalent to sync peak level).
8. Without control voltage at Pin 3 SIF input 1 is
automatically selected.
AFC
AFC
switch
+VS
Loop
comp.
Loop
filter
LVCO
150 W
6.8 pF
10 k W
NC
28
27
26
25
CRef
CVCO
470 nF
24
23
22
21
2.2 mF
NC
20
19
18
17
16
15
9
10
11
12
13
14
NC
NC
94 9292
TDA4472
1
2
3
4
6
5
7
10 mF
SIF 1
*)
SIF
Input switch
8
2.2 mF
AGC (SIF)
10 k W
AGC (VIF)
VIF
Tuner
delay
Tuner
AGC
Video
External L/C circuit (VCO: 38.9 MHz) with TOKO coil 7KN (9 turns, ∅ 0.12 mm)
Figure 3. Test circuit
8 (14)
Rev. A1: 26.07.1995
*)
Rev. A1: 26.07.1995
IFin
50 10 nF
10 nF
4
3
2
1
SAW driver
U4744B
5
6
7
8
10 nF
+12 V
SAW: VIF
B/G
SAW 1
D/K
SAW 2
1
28
SIF 1
SIF 2
2
27
Input switch
S3
3
26
4
25
NC
10 k
Offset
comp.
6
21
10 nF
VIF
7
9
2.2 F
AGC (VIF)
8
S2
10
19
Tuner
10 k
11
18
470 nF
Tuner
AGC
CVCO
Loop
filter
150 AFC switch
*)
LVCO
20
6.8 pF
TDA4472
22
22 F
10 nF
23
10 F
AGC (SIF)
5
24
AFC
51 k 51 k
+5 V
Intercarrier
(FM/NICAM)
Video
12
17
13
16
NC
2.2 F
CRef
14
NC
15
NC
94 8721
TELEFUNKEN Semiconductors
TDA4472-A
external L/C circuit (VCO 38.9 MHz) with TOKO coil 7KN (9 turns, ∅ 0.12 mm)
Figure 4. Basic application circuit
9 (14)
TDA4472-A
TELEFUNKEN Semiconductors
Internal Pin Configuration
6
1, 27
7
2, 28
2k
2k 2k
2k 2.3 V
3V
20 k 4.2 V
94 8521
94 8524
Figure 5. Sound IF inputs (pin 1-2, 27-28)
Figure 8. Video IF input (pin 6-7)
94
8525
3.5 V
60 k 3
10 k 8
94 8522
Figure 6. Input selector switch (pin 3)
Figure 9. VIF-AGC time constant (pin 8)
3.5 V
6.5 k 5
10
6k
94 8526
94 8523
Figure 7. SIF-AGC time constant (pin 5)
10 (14)
Figure 10. Tuner AGC – take over point (pin 10)
Rev. A1: 26.07.1995
TDA4472-A
TELEFUNKEN Semiconductors
94 8527
11
18
2.75 V
Figure 11. Tuner AGC – output (pin 11)
94 8532
Figure 14. Loop filter (pin 18)
3.5 V
12
30 k 19
2.6 mA
10.5 k 94 8533
94 8528
Figure 12. Video output (pin 12)
Figure 15. AFC switch (pin 19)
7k 7k 20
17
21
3.5 V
94 8531
Figure 13. Internal reference voltage (pin 17)
Rev. A1: 26.07.1995
94 8534
Figure 16. VCO (pin 20-21)
11 (14)
TDA4472-A
TELEFUNKEN Semiconductors
3.5 V
94 8538
22
10 k 26
10 k 94 8535
Figure 17. AFC output (pin 22)
Figure 19. VCO offset compensation (pin 26)
100 24
1 mA
94 8536
Figure 18. Intercarrier output (pin 24)
12 (14)
Rev. A1: 26.07.1995
TDA4472-A
TELEFUNKEN Semiconductors
Dimensions in mm
95 10610
Figure 20. 28 pin shrink-dual-in line-plastic (SDIP28)
95 10610
Rev. A1: 26.07.1995
13 (14)
TDA4472-A
TELEFUNKEN Semiconductors
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances ( ODSs).
The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and
forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban
on these substances.
TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of
continuous improvements to eliminate the use of ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency ( EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively.
TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain
such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of,
directly or indirectly, any claim of personal damage, injury or death associated with such unintended or
unauthorized use.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
14 (14)
Rev. A1: 26.07.1995