TDA4470-MFSG3Y [ATMEL]
Audio/Video Demodulator, AM/FM, Bipolar, PDSO28, ROHS COMPLIANT, SSOP-28;
| 型号： | TDA4470-MFSG3Y |
| 厂家： | 
ATMEL |
| 描述： | Audio/Video Demodulator, AM/FM, Bipolar, PDSO28, ROHS COMPLIANT, SSOP-28 光电二极管 商用集成电路 |
| 文件： | 总24页 (文件大小：252K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Features
•
•
5V Supply Voltage
Active Carrier Generation by FPLL (Frequency-Phase-Locked Loop) Principle for True
Synchronous Demodulation
•
•
•
VCO Circuit Operates at Picture Carrier Frequency, the VCO frequency
is Switchable for L’-mode
Alignment-free AFC without External Reference Circuit, Polarity of the
AFC Curve is Switchable
Multistandard
Video-IF and
Quasi Parallel
Sound
VIF-AGC for Negatively Modulated Signals (Peak Synchronous
Detection) and for Positive Modulation (Peak White/Black Level
Detector)
•
•
•
•
•
•
•
•
Tuner AGC with Adjustable Take-over Point
Alignment-free Quasi Parallel Sound (QPS) Mixer for FM/NICAM Sound IF Signals
Intercarrier Output Signal is Gain Controlled (Necessary for Digital Sound Processing)
Complete Alignment-free AM Demodulator with Gain Controlled AF Output
Separate SIF-AGC with Average Detection
Processing IC
Two Independent SIF Inputs
Parallel Operation of the AM Demodulator and QPS Mixer (for NICAM-L Stereo Sound)
Pb-free Package, which is Compliant with Requirements of RoHS
TDA4470
Benefits
•
•
•
Linear Video Demodulation
Good Pulse Response
Excellent Intermodulation Figures
1. Description
The TDA4470 is an integrated bipolar circuit for multistandard video/sound IF
(VIF/SIF) signal processing in TV/VCR and multimedia applications. The circuit pro-
cesses all TV video IF signals with negative modulation (e.g., B/G standard), and the
FM/NICAM sound IF signals.
Rev. 4803C–TVVCR–10/05
Figure 1-1. Block Diagram
L' switch
Offset
comp.
(optional)
Loop
filter
VCO
21
20
14
26
18
VCO
+
phase shift
Control
AFC
0°
FPLL
90°
19
22
AFC
switch
AFC
VIF amp
6
12
13
VIF
7
Video
CAGC
Video det.
8
Standard
switch
AGC
(VIF)
Standard
15
CBL
Tuner
11
10
23
17
VS
Tuner
AGC
Supply
CRef
Take-over
point
FM det.
27
28
24
Intercarrier
SIF 2
(FM/NICAM)
SIF amp
SIF input
switch
3
1
2
25
AGC
(SIF)
AF
(AM)
SIF 1
AM det.
5
4, 9,16
CAGC
2
TDA4470
4803C–TVVCR–10/05
TDA4470
2. Circuit Description
2.1
Vision IF Amplifier
The video IF signal (VIF) is fed through a SAW filter to the differential input (pins 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). The output signal of the VIF amplifier
is applied to the FPLL carrier generation and the video demodulator.
2.2
Tuner-and VIF-AGC
At pin 8, the VIF-AGC charges/discharges the AGC capacitor to generate a control voltage for
setting the gain of the VIF amplifier and tuner in order to keep the video output signal at a con-
stant level. Therefore, the synchronous level of the demodulated video signal is the criterion for
a fast charge/discharge of the AGC capacitor. For positive modulation (e.g., L standard) the
peak white level of the video signal controls the charge current. In order to reduce the reaction
time for positive modulation, where a large time constant is needed, an additional black level
detector controls the discharge current in the event of decreasing VIF input signal. 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). The take-over point of
the tuner AGC can be adjusted at pin 10 by a potentiometer or an external DC voltage (from an
interface circuit or microprocessor).
2.3
FPLL, VCO and AFC
The FPLL (Frequency-Phase-Locked Loop) circuit consists of a frequency and phase detector to
generate the control voltage for the VCO tuning. In locked mode, the VCO is controlled by the
phase detector, in unlocked mode, the frequency detector is superimposed. The VCO operates
with an external resonance circuit (L and C in parallel) and is controlled by internal varicaps. The
VCO control voltage is also converted to a current and represents the AFC output signal at pin
22. At the AFC switch (pin 19) three operating conditions of the AFC are possible: the AFC curve
“rising” or “falling” and AFC “off”.
A practicable VCO alignment of the external coil is the adjustment to zero AFC output current at
pin 22. At the center frequency, the AFC output current is equal to zero. Furthermore, at pin 14,
the VCO center frequency can be switched to set it to the required L’ value (L’ standard).
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.
The oscillator signal passes a phase shifter and supplies the in-phase signal (0°) and the
quadrature signal (90°) of the generated picture carrier.
3
4803C–TVVCR–10/05
2.4
Video Demodulation and Amplifier
The video IF signal, which is applied from the gain-controlled IF amplifier, is multiplied with the
in-phase 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). A stan-
dard dependent DC level shift in this stage delivers the same synchronous level for positive and
negative modulation. An additional noise clipping is provided. The video signal is fed to the
VIF-AGC and to the video output buffer. This amplifier with a gain of 6 dB offers easy adoption of
the sound trap. For a nominal video IF modulation, the video output signal at pin 12 is 2 VPP.
2.5
Sound IF Amplifier and SIF-AGC
The SIF amplifier is nearly identical with the 3-stage VIF amplifier, except that the first amplifier
stage exists twice and is switchable by a control voltage at pin 3. Therefore, it is possible to
switch between two different SAW filters with minimal external expense. Both SIF inputs fea-
tures 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 AM or FM carrier and controls the SIF ampli-
fier to provide a constant SIF signal to the AM demodulator and QPS mixer.
2.6
AM Demodulator
The alignment-free AM demodulator is realized by a synchronous detector. The modulated SIF
signal from the SIF amplifier output is multiplied in phase with the limited SIF signal (AM is
removed). The AF signal of the demodulator output is fed to the output amplifier and to the
SIF-AGC. For all TV standards with negative video modulation (e.g., B/G standard), the AF out-
put signal (pin 25) is switched off by the standard switch.
2.7
2.8
Quasi Parallel Sound (QPS) Mixer
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 pro-
vided from the VCO. The intercarrier signal is fed via an output amplifier to pin 24.
Standard Switch
To have equal polarity of the video output signal the polarity can be switched in the demodula-
tion stage in accordance with the TV standard. Additionally a standard dependent DC level shift
in the video amplifier delivers the same sync. level. In parallel to this, the correct VIF-AGC is
selected for positively or negatively modulated VIF signals. In the case of negative modulation
(e.g., B/G standard) the AM output signal is switched off. For positive modulation (L standard)
the AM demodulator and QPS mixer is active. This condition allows a parallel operation of the
AM sound signal and the NICAM-L stereo sound.
2.9
L’ Switch
With a control voltage at pin 14 the VCO frequency can be switched in order to set required L’
value (L’ standard). Also a fine adjustment of the L’-VCO center frequency is possible via a
potentiometer. The L' switch is only active for positively modulated video IF-signals (standard
switch in L mode).
4
TDA4470
4803C–TVVCR–10/05
TDA4470
2.10 AFC Switch
2.11 VCR Mode
The AFC output signal at pin 22 can be controlled by a switching voltage at pin 19. It is possible
to select an AFC output signal with a rising- or falling AFC curve and to switch off the AFC.
For VCR mode in a TV set (external video source selected), it is recommended 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 pins 12, 24, and 25 are according to the internal DC voltage.
2.12 Internal Voltage Stabilizer
The internal bandgap reference ensures constant performance independent of supply voltage
and temperature.
5
4803C–TVVCR–10/05
3. Pin Configuration
Figure 3-1. Pinning SO28/SSO28
VI,SIF1
VI,SIF1
1
2
28
VI,SIF2
27 VI,SIF2
3
26
25
VSW
GND
RCOMP
VO,AM
4
24 VO,FM
CAGC
VI,VIF
5
6
23
VS
7
22 VAFC
VI,VIF
CAGC
8
21
20
VVCO
VVCO
GND
9
RTOP
10
11
12
13
19
VSW
ITUN
18 LF
VO,VID
CREF
17
16
15
VSW
GND
CBL
VSW 14
6
TDA4470
4803C–TVVCR–10/05
TDA4470
Table 3-1.
Pin Description
Pin
1, 2
3
Symbol
VI,SF1
VSW
Function
SIF1 input (symmetrical)
Input selector switch
Ground
4, 9, 16
5
GND
CAGC
VI,VIF
CAGC
RTOP
ITUN
SIF-AGC (time constant)
VIF input (symmetrical)
VIF-AGC (time constant)
Take-over point, tuner AGC
Tuner AGC output current
Video output
6, 7
8
10
11
12
VO,VID
VSW
13
Standard switch
14
VSW
L’ switch
15
CBL
Black level capacitor
Internal reference voltage
Loop filter
17
CREF
LF
18
19
VSW
AFC switch
20, 21
22
VVCO
VAFC
VS
VCO circuit
AFC output
23
Supply voltage
24
VO,FM
VO,AM
RCOMP
VI,SIF2
Intercarrier output
AF output - AM sound
Offset compensation
SIF 2 input (symmetrical)
25
26
27, 28
7
4803C–TVVCR–10/05
4. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Reference point pin 4 (9, 16), unless otherwise specified
Parameters
Symbol
Value
Unit
Supply voltage, pin 23
SO28 and SSO28 package
VS
IS
6.0
93
V
Supply current, pin 23
mA
Power dissipation
SO28 and SSO28 package
P
560
5
mW
mA
Output currents, pins 12, 24 and 25
IOUT
External voltages
Pins 1, 2, 5 to 8, 10, 12, 18 and 24 to 28
Pins 15, 20 and 21
Pin 11
+4.5
+3.5
+13.5
VS
V
V
V
V
Vext
Pins 3, 13, 19 and 22
Junction temperature
Tj
+125
–25 to +125
±300
°C
°C
V
Storage temperature
Electrostatic handling(1), all pins
Tstg
VESD
Note:
1. Equivalent to discharging a 200 pF capacitor through a 0Ωresistor.
5. Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient, when soldered to PCB
SO28 package
SSO28 package
RthJA
RthJA
75
130
K/W
K/W
6. Operating Range
Parameters
Symbol
Value
Unit
Supply voltage range, pin 23
SO28 and SSO28 package
VS
4.5 to 6.0
V
Ambient temperature
Tamb
–10 to +85
°C
8
TDA4470
4803C–TVVCR–10/05
TDA4470
7. Electrical Characteristics
VS = +5V, Tamb = +25°C; reference point pin 4 (9, 16), unless otherwise specified.
Parameters
DC-supply
Test Conditions
Pin
23
Symbol
Min.
Typ.
Max.
Unit
Supply voltage, SO28, SSO28
VS
IS
4.5
5.0
85
5.5
93
V
Supply current
mA
VIF-input
6-7
Input sensitivity (RMS value)
Input impedance
Input capacitance
VIF-AGC
For FPLL locked
VIN
RIN
CIN
80
1.2
2
120
µVRMS
kΩ
(1)
(1)
pF
8 and 15
IF gain control range
AGC capacitor
GV
CAGC
CBL
VSW
ISW
60
65
2.2
100
4.0
50
dB
µF
nF
V
8
Black level capacitor
15
Switching voltage: VCR mode (2)
Switching current: VCR mode (2)
Tuner-AGC
µA
10 and 11(3)
Available tuner-AGC current
Allowable output voltage
Itun
V11
1
2
8
4
mA
V
0.3
13.5
10
IF slip - tuner AGC
Current ITUN: 10% to 90%
∆GIF
dB
IF input signal for minimum
take-over point
RTOP = 10 kΩ (VTOP = 4.5V)
VIN
VIN
4
3
mV
mV
dB
IF input signal for maximum
take-over point
RTOP = 0, (VTOP = 0.8V)
40
Variation of the take-over point ∆Tamb = 55°C
by temperature VIF-AGC: GV = 46 dB
∆VIN
2
Notes: 1. This parameter is given as an application information and has not been tested during production.
2. In VCR mode, the VIF- and SIF path is switched off.
3. The adjustment of the turn over point (delayed tuner AGC) with the external resistor RTOP or external voltage VTOP is
possible.
4. Resonance circuit of VCO (fo = 38.9 MHz): CVCO = 8.2 - 10 pF,
Coil LVCO with unloaded Q-factor Qo ≥ 60 for an oscillator voltage ≥ 100 mVRMS at pin 20 - 21
(e.g., TOKO® coil 7 KM, 292 XNS - 4051Z).
5. The oscillator drift is related to the picture carrier frequency, given that the external LC circuit is temperature-compensated.
6. α (1.07) = 20 log (4.43 MHz component/1.07 MHz component); α (1.07) value related to black-white signal
input signal conditions: picture carrier = 0 dB, colour carrier = –6 dB, sound carrier = –24 dB.
7. Without external control at pin 13 the IC automatically operates in mode 1:
negatively modulated video-IF signals and FM/NICAM sound signals.
8. Without a control voltage at pin 19 the falling AFC curve is automatically selected.
9. With an open circuit at pin 14 the L’ switch is not active.
10. 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 synchronous peak level).
11. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54%; VIN =10 mV
12. Without a control voltage at pin 3 the SIF input 1 is automatically selected.
9
4803C–TVVCR–10/05
7. Electrical Characteristics (Continued)
VS = +5V, Tamb = +25°C; reference point pin 4 (9, 16), unless otherwise specified.
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
18, 20,
FPLL and VCO
21 and 26(4)
Maximum oscillator frequency For carrier generation
fVCO
70
MHz
MHz
fVCO = 38.9 MHz,
Vision carrier capture range
∆fcap
±1.5
±2
CVCO = 8.2 pF
(5)
Oscillator drift (free running) as ∆Tamb = 55°C,
∆f/∆t
–0.3
%
function of temperature
Cvco = 8.2 pF,
vco = 38.9 MHz
f
Video Output
12
Output current
- source
- sink
5
3
mA
mA
±I12
2
Output resistance
Video output signal
(1)
Rout
100
2.2
10
Ω
Vpp
%
Peak-to-peak value
VO,VID
∆VO,VID
VSYNC
1.8
2.0
Difference of the video signals Between B/G and L
Synchronous level
1.2
3.4
V
Zero carrier level for negative V13 = VS
modulation, ultra white level
VDC
VDC
V
V
V8 = 3V
Zero carrier level for positive
modulation, ultra black level
V13 = 0
V8 = 3V
1.15
Supply voltage influence on the
ultra white and ultra black level
∆V/V
B
1
8
%/V
MHz
dB
Video bandwidth (–3 dB)
RL ≥ 1 kΩ, CL ≤50 pF
6
Video frequency response over
the AGC range
∆B
∆G
2.0
5
Differential gain error
2
%
Notes: 1. This parameter is given as an application information and has not been tested during production.
2. In VCR mode, the VIF- and SIF path is switched off.
3. The adjustment of the turn over point (delayed tuner AGC) with the external resistor RTOP or external voltage VTOP is
possible.
4. Resonance circuit of VCO (fo = 38.9 MHz): CVCO = 8.2 - 10 pF,
Coil LVCO with unloaded Q-factor Qo ≥ 60 for an oscillator voltage ≥ 100 mVRMS at pin 20 - 21
(e.g., TOKO® coil 7 KM, 292 XNS - 4051Z).
5. The oscillator drift is related to the picture carrier frequency, given that the external LC circuit is temperature-compensated.
6. α (1.07) = 20 log (4.43 MHz component/1.07 MHz component); α (1.07) value related to black-white signal
input signal conditions: picture carrier = 0 dB, colour carrier = –6 dB, sound carrier = –24 dB.
7. Without external control at pin 13 the IC automatically operates in mode 1:
negatively modulated video-IF signals and FM/NICAM sound signals.
8. Without a control voltage at pin 19 the falling AFC curve is automatically selected.
9. With an open circuit at pin 14 the L’ switch is not active.
10. 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 synchronous peak level).
11. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54%; VIN =10 mV
12. Without a control voltage at pin 3 the SIF input 1 is automatically selected.
10
TDA4470
4803C–TVVCR–10/05
TDA4470
7. Electrical Characteristics (Continued)
VS = +5V, Tamb = +25°C; reference point pin 4 (9, 16), unless otherwise specified.
Parameters
Test Conditions
Pin
Symbol
∆P
Min.
Typ.
2
Max.
Unit
deg
dB
Differential phase error
Intermodulation 1.07 MHz
Video signal-to-noise ratio
5
(6)
αIM
52
56
60
60
Weighted, CCIR-567
S/N
dB
Residual vision carrier
fundamental wave 38.9 MHz
and second harmonic
77.8 MHz
Vres1
2
10
mV
Lower limiting level
Upper limiting level
Ripple rejection
Below synchronous level
Above ultra white level
Pin 23/pin 12(1)
∆Vlim1
∆Vlim2
RR
400
600
mV
mV
dB
35
Standard Switch
13
Control voltage for mode 1:
negatively modulated video-IF (7)
signals and AM/NICAM sound
VSW
2.0
VS
V
Control voltage for mode 2:
positively modulated video-IF
signals and AM/L-NICAM
sound
VSW
0
0.8
V
Switching current
AFC Output
ISW
±100
µA
22
Control slope
∆I/∆f
0.7
µA/kHz
%
Related to the picture carrier
frequency
Frequency drift by temperature
0.25
0.6
0.4
Output voltage
- upper limit
- lower limit
VAFC
IAFC
VS – 0.4
V
V
Output current
±0.2
mA
Notes: 1. This parameter is given as an application information and has not been tested during production.
2. In VCR mode, the VIF- and SIF path is switched off.
3. The adjustment of the turn over point (delayed tuner AGC) with the external resistor RTOP or external voltage VTOP is
possible.
4. Resonance circuit of VCO (fo = 38.9 MHz): CVCO = 8.2 - 10 pF,
Coil LVCO with unloaded Q-factor Qo ≥ 60 for an oscillator voltage ≥ 100 mVRMS at pin 20 - 21
(e.g., TOKO® coil 7 KM, 292 XNS - 4051Z).
5. The oscillator drift is related to the picture carrier frequency, given that the external LC circuit is temperature-compensated.
6. α (1.07) = 20 log (4.43 MHz component/1.07 MHz component); α (1.07) value related to black-white signal
input signal conditions: picture carrier = 0 dB, colour carrier = –6 dB, sound carrier = –24 dB.
7. Without external control at pin 13 the IC automatically operates in mode 1:
negatively modulated video-IF signals and FM/NICAM sound signals.
8. Without a control voltage at pin 19 the falling AFC curve is automatically selected.
9. With an open circuit at pin 14 the L’ switch is not active.
10. 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 synchronous peak level).
11. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54%; VIN =10 mV
12. Without a control voltage at pin 3 the SIF input 1 is automatically selected.
11
4803C–TVVCR–10/05
7. Electrical Characteristics (Continued)
VS = +5V, Tamb = +25°C; reference point pin 4 (9, 16), unless otherwise specified.
Parameters
AFC Switch
Test Conditions
Pin
19
Symbol
Min.
Typ.
Max.
Unit
Control voltage:
AFC “off”
AFC curve rising
AFC curve falling
0
1.5
3.5
0.8
2.5
VS
V
V
V
(8)
VSW
Switching current
ISW
±100
µA
L’ switch
14
Control voltage:
L’ frequency +
L’-VCO alignment
VSW
0
3.0
VS
V
L standard
(9)
3.4
V
Switching current
SIF Inputs
VSW = 0
ISW
700
80
µA
1-2, 27-28
Input sensitivity
(RMS value)
Output signal
at pin 24/25: –3 dB
VIN
120
µVRMS
Input impedance
Input capacitance
SIF-AGC
(1)
(1)
RIN
CIN
1.2
2
kΩ
pF
5
IF gain control range
AGC capacitor
GV
60
65
10
dB
µF
CAGC
Intercarrier Output-FM
DC output voltage
Output resistance
24(10)
VDC
2
V
(1)
ROUT
150
Ω
Sound IF output voltage
(5.5 MHz output voltage)
VIN = 10 mV
VOUT
180
250
350
mVRMS
Notes: 1. This parameter is given as an application information and has not been tested during production.
2. In VCR mode, the VIF- and SIF path is switched off.
3. The adjustment of the turn over point (delayed tuner AGC) with the external resistor RTOP or external voltage VTOP is
possible.
4. Resonance circuit of VCO (fo = 38.9 MHz): CVCO = 8.2 - 10 pF,
Coil LVCO with unloaded Q-factor Qo ≥ 60 for an oscillator voltage ≥ 100 mVRMS at pin 20 - 21
(e.g., TOKO® coil 7 KM, 292 XNS - 4051Z).
5. The oscillator drift is related to the picture carrier frequency, given that the external LC circuit is temperature-compensated.
6. α (1.07) = 20 log (4.43 MHz component/1.07 MHz component); α (1.07) value related to black-white signal
input signal conditions: picture carrier = 0 dB, colour carrier = –6 dB, sound carrier = –24 dB.
7. Without external control at pin 13 the IC automatically operates in mode 1:
negatively modulated video-IF signals and FM/NICAM sound signals.
8. Without a control voltage at pin 19 the falling AFC curve is automatically selected.
9. With an open circuit at pin 14 the L’ switch is not active.
10. 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 synchronous peak level).
11. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54%; VIN =10 mV
12. Without a control voltage at pin 3 the SIF input 1 is automatically selected.
12
TDA4470
4803C–TVVCR–10/05
TDA4470
7. Electrical Characteristics (Continued)
VS = +5V, Tamb = +25°C; reference point pin 4 (9, 16), unless otherwise specified.
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Reference signal:
VIN = 10 mV
FM deviation = ±27 kHz
fmod = 1 kHz
Weighted signal-to-noise ratio: tested with the double
(CCIR 468)
FM demodulated U2860B
B/G modulated VIF signal
Black screen: Channel 1/2
Grid pattern: Channel 1/2
Grey screen 50%: Channel 1/2
S/N
S/N
S/N
60/58
54/52
60/57
dB
dB
dB
Ripple rejection
AF Output-AM
DC output voltage
Output resistance
AF output voltage
(1)
23, 24
25(11)
RR
35
dB
VDC
ROUT
VOAF
2.2
150
500
V
Ω
(1)
400
630
2
mVRMS
m = 54%
Total harmonic distortion
THD
1
%
f
mod = 1 kHz and 12.5 kHz
Reference: m = 54%,
fmod = 1 kHz,
22 kHz low-pass filter
Pin 23/pin 25(1)
Signal to noise ratio
S/N
RR
65
dB
dB
Ripple rejection
28
SIF Input Selector Switch
3
Control voltage:
- input 1 active
- input 2 active
(12)
2.0
0
VS
0.8
V
V
VSW
ISW
Switching current
±100
µA
Notes: 1. This parameter is given as an application information and has not been tested during production.
2. In VCR mode, the VIF- and SIF path is switched off.
3. The adjustment of the turn over point (delayed tuner AGC) with the external resistor RTOP or external voltage VTOP is
possible.
4. Resonance circuit of VCO (fo = 38.9 MHz): CVCO = 8.2 - 10 pF,
Coil LVCO with unloaded Q-factor Qo ≥ 60 for an oscillator voltage ≥ 100 mVRMS at pin 20 - 21
(e.g., TOKO® coil 7 KM, 292 XNS - 4051Z).
5. The oscillator drift is related to the picture carrier frequency, given that the external LC circuit is temperature-compensated.
6. α (1.07) = 20 log (4.43 MHz component/1.07 MHz component); α (1.07) value related to black-white signal
input signal conditions: picture carrier = 0 dB, colour carrier = –6 dB, sound carrier = –24 dB.
7. Without external control at pin 13 the IC automatically operates in mode 1:
negatively modulated video-IF signals and FM/NICAM sound signals.
8. Without a control voltage at pin 19 the falling AFC curve is automatically selected.
9. With an open circuit at pin 14 the L’ switch is not active.
10. 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 synchronous peak level).
11. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54%; VIN =10 mV
12. Without a control voltage at pin 3 the SIF input 1 is automatically selected.
13
4803C–TVVCR–10/05
Figure 7-1. Test Circuit
Intercarrier
(FM/NICAM)
AF
(AM)
SIF 2
AFC
AFC
switch
+VS
Loop
comp.
Loop
filter
Black
level
(1)
22 µF
CRef
150 Ω
LVCO
8.2 pF
10 kΩ
CVCO
470 nF
470 nF
19
28
26
25
24
23
22
20
18
27
21
17
16
15
9
10
11
12
13
14
5
7
8
6
1
2
3
4
10 µF
22 K
10 kΩ
2.2 µF
Video
neg/pos
AGC (VIF)
AGC (SIF)
SIF
Input switch
Tuner
delay
L'
VIF
SIF 1
Tuner
AGC
Video
(1)external L/C circuit (VCO 38.9 MHz)
with TOKO coil 7KM, 292 XNS - 4051Z
14
TDA4470
4803C–TVVCR–10/05
TDA4470
Figure 7-2. Basic Application Circuit
(1)External L/C circuit (VCO: 38.9 MHz)
with TOKO coil 7KM, 292 XNS - 4051Z
15
4803C–TVVCR–10/05
8. Internal Pin Configuration
Figure 8-1. Sound IF Inputs (Pins 1-2, 27-28)
1, 27
2, 28
2 kΩ
2 kΩ
3 V
20 kΩ
Figure 8-2. Input Selector Switch (Pin 3)
3.5 V
60 kΩ
10 kΩ
3
Figure 8-3. SIF-AGC Time Constant (Pin 5)
5
16
TDA4470
4803C–TVVCR–10/05
TDA4470
Figure 8-4. Video IF Input (Pins 6-7)
2 k
Ω
2 kΩ
2.3 V
4.2 V
Figure 8-5. VIF-AGC Time Constant (Pin 8)
8
Figure 8-6. Tuner AGC - Take-over Point (Pin 10)
3.5 V
6.5 kΩ
6 kΩ
17
4803C–TVVCR–10/05
Figure 8-7. Tuner AGC - Output (Pin 11)
Figure 8-8. Video Output (Pin 12)
2.6 mA
Figure 8-9. Standard Switch (Pin 13)
3.5 V
17 kΩ
15.5 kΩ
13
23 kΩ
18
TDA4470
4803C–TVVCR–10/05
TDA4470
Figure 8-10. Black Level Capacitor (Pin 15)
2.7 V
5 kΩ
15
Figure 8-11. Internal Reference Voltage (Pin 17)
3.5 V
Figure 8-12. Loop Filter (Pin 18)
2.75 V
19
4803C–TVVCR–10/05
Figure 8-13. AFC Switch (Pin 19)
3.5 V
30 kΩ
19
10.5 kΩ
Figure 8-14. VCO (Pins 20-21)
7 kΩ
7 kΩ
Figure 8-15. AFC Output (Pin 22)
20
TDA4470
4803C–TVVCR–10/05
TDA4470
Figure 8-16. Intercarrier Output (Pin 24)
100 Ω
24
1 mA
Figure 8-17. AF Output AM Sound (Pin 25)
100 Ω
25
1.4 mA
Figure 8-18. VCO Offset Compensation (Pin 26)
3.5 V
10 kΩ
10 kΩ
21
4803C–TVVCR–10/05
9. Ordering Information
Extended Type Number
Package
Remarks
Standard Package Quantitiy
TDA4470-MFLY
SO28, Pb-free
SO28, Pb-free
SSO28, Pb-free
SSO28, Pb-free
Delivery in Tubes
Delivery in taped form
Delivery in Tubes
Delivery in taped form
1,500
2,000
3,000
4,000
TDA4470-MFLG3Y
TDA4470-MFSY
TDA4470-MFSG3Y
10. Package Information
9.15
8.65
Package SO28
Dimensions in mm
18.05
17.80
7.5
7.3
2.35
0.25
0.25
0.10
0.4
10.50
10.20
1.27
16.51
28
15
technical drawings
according to DIN
specifications
1
14
22
TDA4470
4803C–TVVCR–10/05
TDA4470
5.7
5.3
Package SSO28
Dimensions in mm
9.10
9.01
4.5
4.3
1.30
0.15
0.15
0.05
0.25
0.65
6.6
6.3
8.45
28
15
technical drawings
according to DIN
specifications
1
14
23
4803C–TVVCR–10/05
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