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U4460BG-M
Video IF Amplifier with FPLL Demodulation
Description
The U4460BG is an integrated bipolar circuit for video IF (VIF) signal processing in TV/VCR and multimedia applications. The circuit processes all TV video IF signals with negative modulation (e.g., B/G standard).
Features
D Active carrier generation by FPLL principle
(frequency-phase-locked-loop) for true synchronous demodulation
D Very linear video demodulation, good pulse
response and excellent intermodulation figures
D D D D
VIF-AGC with peak sync. detection Tuner AGC with adjustable take over point 5 V supply voltage; low power consumption Relevant pinning is compatible with the TDA4474 /71 video-/ sound IF combination
D VCO operates on picture carrier frequency D Alignment-free AFC, no external reference circuit
Package: SDIP28
Offset comp. (optional)
Loop filter
VCO
FPLL
0 90
VCO + phase shift
AFC
5 VIF
VIF amp
Video det. AGC (VIF)
CAGC
7
11 Take over point
Tuner AGC
Supply
95 9815
Figure 1. Block diagram
Rev. A2, 23-Apr-99
II I II I II
Tuner 12
II
6
II II I II
23 AFC 13 Video 24 VS 18 CRef 1 (9)
3,8,17
II I II II II II I II II II II II II II II II II II
27
19
22
21
AFC 20 switch
U4460BG-M
Pin Description
n.c. n.c. GND n.c. Vi, VIF Vi, VIF CAGC GND n.c. 1 2 3 4 5 6 7 8 9 28 n.c. 27 Rcomp 26 n.c. 25 n.c. 24 VS 23 VAFC 22 VVCO 21 VVCO
20 n.c. 19 LF 18 17 16 15
95 10650
n.c. 10 Rtop Itun VO, vid n.c. 11 12 13 14
Figure 2. Pinning
CRef GND n.c. n.c.
Circuit Description
Vision IF Amplifier
The video IF signal (VIF) is fed through a SAW filter to the VIF input (Pin 5-6). The VIF 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.
2 (9)
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VIF-AGC and Adjustable Tuner AGC
At Pin 7, the VIF-AGC charges/ discharges the AGC capacitor to generate a control voltage for setting the gain of VIF amplifier and tuner in order to keep the video output signal at a constant level. Therefore, 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 7) is transferred to an internal control signal and fed to the tuner AGC to generate the tuner AGC current at Pin 12 (open collector output). The take over point of the tuner AGC can be adjusted at Pin 11 by a potentiometer or an external dc voltage (from interface circuit or microprocessor). Rev. A2, 23-Apr-99
Pin 1 2 3 4 5, 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21, 22 23 24 25 26 27 28
Symbol n.c. n.c. GND n.c. Vi,VIF CAGC GND n.c. n.c. Rtop Itun Vo,vid n.c. n.c. n.c. GND Cref LF n.c. Vvco VAFC Vs n.c. n.c. Rcomp n.c.
Function Not connected Not connected Ground Not connected VIF input (symmetrical) VIF-AGC (time constant) Ground Not connected Not connected Take over point, tuner AGC Tuner AGC output current Video output Not connected Not connected Not connected Ground Internal reference voltage Loop filter AFC switch VCO circuit AFC output Supply voltage Not connected Not connected Offset compensation Not connected
U4460BG-M
FPLL, VCO and AFC
The FPLL circuit (frequency phase locked loop) consists of a frequency and phase detector for generating the control voltage for the VCO tuning. In the locked mode, the VCO is controlled by the phase detector, whereas 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. The VCO control voltage is also converted to a current and represents the AFC output signal at Pin 23. A practicable VCO alignment of the external coil is the adjustment to zero AFC output current at Pin 23. At center frequency, the AFC output current is equal to zero. The optional potentiometer at Pin 27 allows an offset compensation of the VCO phase for improved sound quality (fine adjustment). Without a potentiometer (open circuit at Pin 27), 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.
Video Demodulation and Amplifier
The video IF signal, which is applied from the gain controlled IF amplifier, is multiplied with the inphase 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). The video signal is fed to VIFAGC and to the video output buffer. This amplifier, with a 6 dB gain, offers easy adaption of the sound trap. For nominal video IF modulation, the video output signal at Pin 13 is 2 V (peak-to-peak value).
Internal Voltage Stabilizer
The internal bandgap reference ensures constant performance independent of supply voltage and temperature.
Absolute Maximum Ratings
Reference point Pin 3 (8, 17), unless otherwise specified Parameters Supply voltage Pin 24 Supply current Pin 24 Power dissipation, Vs = + 9 V Output currents Pin 13 External voltages Pin 5, 6, 7, 11, 13, 18, 19, 27 Pin 21, 22 Pin 12 Pin 20,23 Junction temperature Storage temperature Electrostatic handling *) all pins Symbol Vs Is P Iout Value 9.0 93 840 5 Unit V mA mW mA V V V V C C V
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Vext Tj Tstg VESD + 4.5 + 3.5 + 13.5 Vs +125 -25 to +125 *) Equivalent to discharging a 200 pF capacitor through a 0 W resistor
"300
Operating Range
Parameters Supply voltage range Ambient temperature Pin 24
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Rev. A2, 23-Apr-99 3 (9)
Symbol Vs Tamb
Value 4.5 to 9.0 -10 to +85
Unit V C
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Electrical Characteristics Thermal Resistance
Vs = +5 V, Tamb = +25C; reference point Pin 3 (8, 17), unless otherwise specified Oscillator drift (free runing) as function of temperature FPLL and VCO Max. oscillator frequency Vision carrier capture range 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 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 Parameters Junction ambient when soldered to PCB Pins 19, 21, 22, 27, see note 4 For carrier generation fvco 70 fvco = 38.9 MHz Dfcap Cvco = 8.2 pF See note 5 Df/DT DTamb = 55C, Cvco = 8.2 pF, fvco = 38.9 MHz
U4460BG-M
4 (9)
Tamb = 55C VIF-AGC: Gv = 46 dB
Current Itun: 10% to 90% Rtop = 10 k (Vtop= 4.5 V) Rtop = 0 (Vtop = 0.8 V)
See note 2
See note 2
See note 1 See note 1
For FPLL locked
Test Conditions / Pins Pin 24
Pins 11, 12, see note 3 Itun
Pins 5-6
Pin 7
Symbol
Gv CAGC Vsw
DGIF
Dvin
Symbol RthJA
Vout
Rin Cin
Isw
vin
vin
vin
Vs Is
"1.5
Min.
0.3
4.5
40
60
1
Value 55
Typ.
"2
65 2.2 4.0
1.2 2
5.0 85
50
80
2
8
2
Rev. A2, 23-Apr-99 Max. -0.3 13.5 10 4 120 9.0 93 3 4 Unit K/W
mVRMS
MHz MHz Unit mV V dB mV mA V mA
mA
kW pF
dB
dB
mF
% V
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Notes: AFC output Control slope Frequency drift by temperature Output voltage upper limit p g pp lower limit Output current Parameters Video output Output current -source p -sink Output resistance Video output signal Sync. level Zero carrier level (neg. modolation) (= 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 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 Related to the picture carrier frequency Below sync. level Above ultra white level Pin 24/ Pin 13; see note 1 Pin 23 See note 6 Weighted , CCIR-567 RL V7 = 3 V See note 1 Peak-to-peak value Test Conditions / Pins Pin 13
Rev. A2, 23-Apr-99
5.) 6.) 4.) 1.) 2.) 3.)
This parameter is given as an application information and not tested during production. In "VCR mode" the VIF path is switched off. Adjustment of turn over point (delayed tuner AGC) with external resistor Rtop or external voltage Vtop possible. Resonance circuit of the VCO: f = 38.9 MHz Capacitor CVCO = 8.2 - 10 pF, coil LVCO with unloaded Q-factor Qo 60 for an oscillator voltage 100 mVRMS (Pin 21-22), e.g. TOKO coil 7KM, 292XNS-4051Z) The oscillator drift is related to the picture carrier frequency, at external temperature-compensated LC circuit 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
1 kW, CL 50 pF
DVlim1 DVlim2
Symbol
"I
DVDC
DV/V
DI/Df
Rout vo,vid Vsync
VAFC
IAFC
S/N vres1
aIM
DG DP
DB
RR
B
out
VS-0.4
Min.
1.8
35
52 56
6
2
U4460BG-M
"0.2
Typ.
0.7 0.25
400 600
2.0 1.2 3.4
2 2 60 60 2
8
1
Max.
5 3 100 2.2
0.4
0.6
2.0
10
5 5
mA/kHz
MHz dB
%/V
Unit
Vpp V V
V V mA
mV mV dB
% deg dB dB mV
mA
%
W
5 (9)
U4460BG-M
+VS Loop comp. *) LVCO 10 kW n.c. 28 27 n.c. 26 n.c. 25 24 23 22 21 8.2 pF CVCO 470 nF 20 19 AFC AFC switch Loop filter 150 W
CRef 2.2 mF 18 17 n.c. 16 n.c. 15
1 n.c.
2 n.c.
3
4 n.c.
5
6
7 2.2 mF AGC (VIF)
8
9 n.c.
10 n.c.
11
12
13
14 n.c.
10 kW
VIF *) External L/C circuit (VCO: 38.9 MHz) with TOKO coil 7KM, 292 XNS-4051Z
Figure 3. Test circuit
Tuner delay Tuner Video AGC
Internal Pin Configuration
94 8525
2 kW
2 kW 2.3 V
4.2 V
94 8524
Figure 4. Video IF input (Pin 5-6)
Figure 5. VIF-AGC time constant (Pin 7)
6 (9)
Rev. A2, 23-Apr-99
95 9642
U4460BG-M
3.5 V 6.5 kW 6 kW
94 8526
3.5 V
Figure 6. Tuner AGC - take-over point (Pin 11)
94 8531
Figure 9. Internal reference voltage (Pin 18)
94 8527
Figure 7. Tuner AGC - output (Pin 12)
2.75 V
94 8532
Figure 10. Loop filter (Pin 19)
7 kW
7 kW
2.6 mA
94 8528
94 8534
Figure 8. Video output (Pin 13)
Figure 11. VCO (Pin 21-22)
Rev. A2, 23-Apr-99
7 (9)
U4460BG-M
94 8538
3.5 V
10 kW 10 kW
94 8535
Figure 12. AFC output (Pin 23)
Figure 13. VCO offset compensation (Pin 27)
Dimensions in mm
95 10610
Figure 14. 28 pin shrink-dual-inline-plastic (SDIP28)
8 (9)
Rev. A2,95 10610 23-Apr-99
U4460BG-M
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC Semiconductor 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 Semiconductor GmbH 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 Semiconductor GmbH 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 Semiconductors products for any unintended or unauthorized application, the buyer shall indemnify TEMIC Semiconductors 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 Semiconductor GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2594, Fax number: 49 ( 0 ) 7131 67 2423
Rev. A2, 23-Apr-99
9 (9)

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