Video IF Amplifier and Demodulator with Full-SCART TDA 5931-65 Bipolar IC Features ● ● ● ● Multistandard video IF Interference suppression circuitry Mean/peak value control Area of application: TV set with Full-SCART P-DIP-18 Type Ordering Code Package TDA 5931-65 Q67000-A5136 P-DIP-18 Functional Description Video IF for all European standards for positive and negative modulation. The video section contains a Full-SCART interface. An output for the demodulated video signal (pin 9) allows the insertion of a sound trap into the signal path to the input or the SCART switch and the SCART output buffer amplifier (pin 7). The analog setting function (delayed AGC threshold) is controlled via a potentiometer, all other switch functions are controlled via open-collector transistors. Circuit Description The component includes a four-stage, capacitively coupled, symmetrically designed and controlled amplifier, a limiter with selection, and a mixer for quasi-synchronous demodulation of positive and negative modulated IF signals. In addition a video output amplifier and noise suppression circuitry are included. This output is used for generating the AGC voltage. The AGC for both modulation types has been realized as integral AGC with noise free peak and mean value detector (only for positive modulation). For SCART applications this output is switched a video source switch with two inputs (for the demodulator signal or SCART socket) and two outputs (SCART- and TV output). The demodulator output (pin 9) provides a video signal output level 3 dB higher than the level required for the operation of the TV set or to drive the SCART connector. Therefore it is possible to insert a sound trap in between this output and the input of the SCART switch (pin 7). The insertion loss of the sound trap has to attenuate the signal level at pin 9 by a factor 2/3 or 3 dB (AC and DC) to avoid distortions in the SCART switch. The delayed tuner AGC is generated by a threshold amplifier driven by the control voltage. The amplifier response can be controlled by means of an external potentiometer. (The increase of the tuner AGC voltage shall create a higher tuner gain = positive control). Semiconductor Group 31 06.94 TDA 5931-65 Pin Functions Pin No. Function 1 Video IF input 2 SCART switch A/W 3 SCART input 4 SCART input/output 5 + VS supply voltage 6 Positive video output 7 Video output of the sound trap (2 Vpp) 8 Ground 9 Video input of the sound trap (3 Vpp) 10 Demodulator tank circuit 11 Demodulator tank circuit 12 TV-standard switch-over (B/G) – (L) 13 Low-pass filter (averaging) 14 Tuner AGC threshold 15 Tuner AGC output 16 AGC-time constant 17 Ground 18 Video IF input Semiconductor Group 32 TDA 5931-65 Block Diagram Semiconductor Group 33 TDA 5931-65 Absolute Maximum Ratings TA = 0 to 70 °C Parameter Symbol Limit Values min. max. Unit Sound trap input V7 3.3 8.5 V Demodulator output V9 0 V5 V Demodulator output I9 –3 10 mA Supply voltage V5 0 13.2 V SCART A/W V2 0 6 V Pos. video output I6 –3 5 mA Pos. video output V6 0 8.5 V Demodulator tank circuit V10/V11 0 V5 V SCART OUT I4 –3 5 mA SCART OUT V4 0 V5 V Tuner AGC threshold V14 0 6 V Tuner AGC output V15 0 10 V IF input V1/V18 0 6 V IF control V16 0 8.5 V Norm switch-over V12 0 6 V Norm switch-over V13 0 6 V SCART IN V3 0 6 V Junction temperature Tj 150 ˚C Storage temperature Tstg 125 ˚C Thermal resistance (system-air) Tth SA 70 K/W – 40 Operating Range Supply voltage V5 10.8 13.2 V Supply voltage delayed tuner AGC V15 1.5 13.2 V Ambient temperature during operation TA 0 70 ˚C Input frequency range – 3 dB fIF 10 100 MHz Input frequency range – 0.3 dB fIF 30 75 MHz All voltage values are referenced to ground, if not stated otherwise. The current are identified according to the source/sink principle. If the IC considered a sink (the current flows from the respective pin to ground), it is identified by a negative algebraic sign. However, if the IC is the source (the current flows from VB via the respective pin to ground), it is identified by a positive algebraic sign. Semiconductor Group 34 TDA 5931-65 Characteristics TA = 25 ˚C; VS = 12 V Parameter Symbol Limit Values Unit Test Condition min. typ. max. – I5 38.5 56 71.5 mA V1/16 = 10 mVrms V16 V16 0 2.6 0.1 2.85 0.5 6.0 V V V1/16 = 45 µVrms V1/16 = 175 mVrms 0.7 17 82 0.95 23 140 mA µA V16 = 2 V; V6 < 2.2 V V16 = 2 V; V6 > 2.8 V Static Characteristics Total current consumption AGC Voltage Min. AGC Max. AGC AGC-Time Constant (by neg. modulation) Charge current (Imax:2) Discharge current Charge/discharge ratio I16 – I16 V16 0.55 13 55 AGC-Time Constant (by pos. modulation) Charge current Discharge current I16 – I16 1.1 0.15 1.4 0.25 1.7 0.35 mA µA Discharge current Charge/discharge ratio – I16 70 4000 90 5600 110 9000 µA V16 = 2 V; V6 ≥ 4.1 V V16 = 2 V; 3.1 V < V6 < 4.1 V V16 = 2 V; V6 < 2.3 V V16 Averaging by Pos. Modulation White level V13 4.9 5.7 6.5 V V1/18 = 10 mVrms Zero carrier level V13 3.3 3.7 4.1 V V1/18 = 0 V; V16 = 3 V Tuner AGC threshold V14 I14 V16 V16 4.2 650 2.8 0.33 4.5 850 3.1 0.38 4.8 1050 3.4 0.43 V µA V V R14/17 = ∞ V14 = 0 V R14/17 = 10 kΩ R14/17 = 10 Ω I5 = Imax:2 The characteristics data apply to the supply voltage range VS stated or in case of alignment to the alignment instructions (see page 40). All static voltages are referenced to ground if not stated otherwise. The input levels are given as rms values referenced to synchronous peak fPC = 38.9 MHz. Semiconductor Group 35 TDA 5931-65 Characteristics (cont’d) Parameter Symbol Limit Values Unit Test Condition V15 = 0.5 V5 V1/18 = 100 mVrms V14 = 0.75 V V15 = 0.5 V5 V1/18 = 10 mVrms V14 = 4.0 V min. typ. max. – I15 10 18 30 mA – I15 0 – 10 µA IF input V1, V18 5.7 6.0 6.3 V Demodulator tank V10, V11 V5 – V5 – V5 – V 3.5 3.8 4.1 2.6 3.3 mA V9 = 6 V, V1, 18 = 6.2 mA V carrier no-demod. to ground V1/18 = 10 mVrms 3.7 5.7 6.0 V V Signal ratio V9/7 = 3/2 Signal ratio V9/7 = 3/2 V1/18 = 0 V; V16 = 3 V 0 V > V2 > 2.4 V 2.7 mA mA V6 = 6 V Tuner AGC current max. 1 ms Video Output (Demodulator) Output current – I9 1.9 Output current Sychron level I9 V9 4 5.2 V7 V7 3.3 – I6 I6 1.7 4 2.2 V6 V6 3.9 1.9 4.2 2.2 4.9 2.7 V V to ground via R = 500 Ω see Sound Trap Input V1/18 = 10 mVrms V1/18 = 0 V; V16 = 3 V V6 V6 1.9 4.1 2.2 4.4 2.7 5.1 V V V1/18 = 10 mVrms V1/18 = 0 V; V16 = 3 V 5.6 Sound Trap Input Sychron pulse level White level Pos. Video Output Output current Pos. modulation (L standard) White level Zero carrier (sync.) Neg. modulation (BG standard) Synchron pulse level Zero carrier Semiconductor Group 36 TDA 5931-65 Characteristics (cont’d) Parameter Symbol Limit Values min. typ. max. 1.6 2 2.6 Unit Test Condition mA RL = ∞; see Sound Neg. SCART Output Output current Pos. modulation (L standard) White level Zero carrier (sync.) Neg. modulation (BG standard) Synchron pulse level Zero carrier – I4 I4 4 V4 V4 V5 – 5.3 V5 – 5.0 V5 – 4.3 V V5 – 3.2 V5 – 2.9 V5 – 2.5 V Trap Input V4 = V5 to ground via R = 500 Ω V1/18 = 10 mVrms V1/18 = 0 V; V16 = 3 V V4 V4 V5 – 3.2 V5 – 2.9 V5 – 2.5 V V5 – 5.5 V5 – 5.2 V5 – 4.6 V V1/18 = 10 mVrms V1/18 = 0 V; V16 = 3 V V3 I3 1.8 3 via R = 270 kΩ at ground V3 = 1.2 V V12 V12 V2 V2 V2 mA Pos. SCART Input 4 Clamp level Output current 1.9 2 V mA 0 2.4 1.9 6 V V 2.4 0 6 1.9 V V 60 µV 6 Vpp – 1 dB 6 Vpp – 1 dB Switching Voltage L = L/E standard H = B/G standard o. open Switching Voltage Open = SCART operat. H = SCART operation L = HF operation Dynamic Characteristics Min. IF-input voltage start of internal AGC operation f PC rms V1/18 Max. IF-input voltage (end of internal AGC-control range) f PC rms V1/18 105 140 mV IF-control range ∆v 65 70 dB Semiconductor Group 45 37 TDA 5931-65 Characteristics (cont’d) Parameter Symbol Limit Values min. typ. Unit Test Condition max. Video output voltages (peak to peak) f PC = 10 mVrms with neg. modulation and residual carrier = 10%; with neg. modulation and residual carrier < 6% Pos. video output changes related to V6 ∆V6 1.8 2.0 2 2.2 5 Vpp % 0 V < V2 < 1.9 V 0 V < V12 < 1.9 V; 0 < V2 < 1.9 V 2.4 V < V12 < 6 V 1.5 3 % ∆V6/∆V5 10.8 V < V5 < 13.2 V 2.1 2.3 Vpp RL = ∞ 0.2 0.5 dB 2.1 TV-standard switch over Change due to operating voltage Neg. SCART output V4 Changes of the video output voltage over the control range of 55 dB ∆V6 Video gain V6/V3 1.9 2.0 Video bandwidth P6/3-3dB 8 9 MHz 2.4 < V2 < 6 V; V3 = 1 Vpp sinus Cross talk attenuation A 40 50 dB 0 < V2 < 1.9 V; V1/18 = 0 V; V16 = 3 V; V3 = 1 Vpp sinus 50 Hz … 10 MHz 1.5 2 2.5 kΩ 1.9 RG < 500 Ω; 2.4 < V2 < 6 V; V3 = 1 Vpp (2 MHz) Design Notes (no 100% final test) Input resistance (symmetrical) R1/18 Input capacitance (symmetrical) C1/18 2 5 pF Low pass cut-off f– 3 dB (13) 70 100 130 Hz Pos. video output white level V6 3.9 4.2 4.9 V Synchron pulse level frequency V6 1.9 2.2 2.7 V Video input voltage ± 3 dB at RG < 500 Ω V3 Semiconductor Group 1 38 Vpp C13/17 = 100 nF ± 10% 2.4 < V2 = 6 V; (SCART operation) V3 = 1 Vpp norm video signal V3 = 1 Vpp norm video signal TDA 5931-65 Characteristics (cont’d) Parameter Symbol Limit Values min. typ. Unit Test Condition max. Intercarrier noise voltages ratio (weighted according CCIR 468) with parallel tank circuit 38.9 MHz, SAW 361 D, fTT = 5.5 MHz (– 13 dB), demod.: TBA 120 S/N 48 dB S/N 17 dB FuBk – test picture – ∆S/N FuBk – test picture – ∆S/N 2 dB 11 dB Dyn. Output Resistance Pos. video output Neg. video output R6 R4 Noise figure V1/18 = – 57 dBm = + 50 dB µV RG = 800 Ω F 80 100 115 150 150 200 Ω Ω 5 7 dB Video noise voltage ratio at BT = 10 mVrms 0 dB = 700 mVrms BA unweighted weighted according to CCIR Rec. 567-1 S/N 50 55 dB S/N 55 60 dB B3 dB B– 12 dB 8 15 10 17 13 20 MHz MHz V6 3.0 6.0 mV V6 0.3 0.6 mV Video Frequency Response – 3 dB – 12 dB Residual Carrier Voltage at Video Output fPC = 10 mVr ms 38.9 MHz Fundamental wave 1. harmonic wave f = 77.8 MHz Semiconductor Group 39 V1/18 = 10 mVpp FuBk mod. V1/18 = 10 mVpp 2.753 MHZ mod. with detuning ∆f = – 400 kHz with detuning ∆f = + 400 kHz TDA 5931-65 Characteristics (cont’d) Parameter Symbol Limit Values min. typ. Unit Test Condition max. Differential Gain with fPC = 10 mV (staircase signal) Peak to Peak According to CCIR Rec. 567-1 Staircase signal Changes via AGC Changes via detuning fPC = 38.9 MHz; ∆ f ± 400 kHz DG ∆ DG / ∆ v ∆ DG / ∆ f 4.5 6 ±1 ± 1.5 % % % Differential Phase with fPC = 10 mVrms (staircase signal) Peak to Peak According to CCIR Rec. 567-1 Staircase signal Changes via AGC Changes via detuning fPC = 38.9 MHz; ∆ f ± 400 kHz DP ∆ DP / ∆ v ∆ DP / ∆ f 2 2.5 1 ±1 degree degree degree 32 54 51 38 60 57 – – – dB dB dB 300 450 600 mVpp 5 % Interdemodulation Ratio With fIM = 1.07 MHz = fTT – fFT With BT = 10 mVeff With sound porch – 13 dB aIM With sound porch – 13 dB aIM With sound porch – 13 dB aIM Demodulator Tank Circuit Voltage fPC = 38.9 MHz; C = 47 pF L = 350 nH 100 ≤ Q0 ≤ 120; Q8 ≈ 60; B ≈ 0.8 … 1.0 MHz Synchron pulse Semiconductor Group V10/11 ∆VSync/V6 40 OFW G 3950 OFW 361D OFW G 1956 TDA 5931-65 Alignment Instructions At a video carrier input level of V1/18 = 4 mVrms, fPC = 38.9 MHz and a superimposed AGC voltage of V16 = 1.5 V the tank circuit is aligned that way, that at the positive video output the demodulated video signal 6 Vpp is at its maximum. As a modulation every sufficient video test pattern can be used. Then the superimposed AGCcontrol voltage at pin 16 is reduced until the video signal has an amplitude of approx. 2 Vpp. The video signal is then fine tuned for its maximum. The adjustment is not critical due to the wide maximum. The adjustment can also be performed regarding intercarrier signal to noise ratio, differential gain or 2T-pulse response. Semiconductor Group 41 TDA 5931-65 Test Circuit Semiconductor Group 42 TDA 5931-65 Application Circuit Semiconductor Group 43