Type Ordering Code Package TDA X Q67000-A5167 P-DSO-20-1 (SMD) TDA X Q67006-A5167 P-DSO-20-1 Tape & Reel
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1 Video Modulator for FM/AM-Audio with PLL-Output TDA X Preliminary Data Bipolar IC Features FM- and AM-audio modulator Symmetrical RF-oscillator output for PLL-control 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 2 V supply voltage P-DSO-20 - Type Ordering Code Package TDA X Q67000-A567 P-DSO-20- (SMD) TDA X Q67006-A567 P-DSO-20- Tape & Reel Functional Description and Application The monolitic integrated circuit TDA X 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 04.95
2 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 5-7 of approximately 80 db. For optimal residual carrier suppression, the symmetrical mixer outputs at pins 5, 7 should be connected to a matched balanced-to-unbalanced broadband transformer, e.g. a Guanella transformer with good phase precision at 0 o and 80 o. 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 2. 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 3, 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 4 is connected to ground. By varying the value of resistance R at pin 4 between... 0 Ω the modulation depth can be increased from 70% to 00% when the modulation is negative and decreased from 00% to 70% when the modulation is positive. Audio Via pin, 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 9, 20. The unloaded Q of the resonant circuit must be Q = 25 and the parallel resistor R T = 8.2 kω to ensure a video to audio carrier ratio of 2.5 db. At the same time, the capacitative and/or inductive reactance for the resonance frequency should have a value of X C X L 800 Ω. Via pin 8, 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 8. The video to audio carrier ratio can be changed by connecting an external voltage to pin 8, which deviates from the internal reference voltage. Through an additional external dc voltage at pin 8, 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
3 Pin Configuration (top view) P-DSO-20- Semiconductor Group 3
4 Pin Definitions and Functions Pin No. Symbol Function FM-Audio AF-input for FM-modulation 2 V REF Internal reference voltage (7.5 V) 3 OSC-Input Symmetrical oscillator input 4 OSC-Out Symmetrical oscillator output 5 OSC-Ground Oscillator ground 6 OSC-Out 2 Symmetrical oscillator output 7 OSC-Input 2 Symmetrical oscillator input 8 V S Supply voltage (2 V) 9 N.C. Not connected 0 PLL-Out Symmetrical unmodulated oscillator output PLL-Out 2 Symmetrical unmodulated oscillator output 2 Video Video input with clamping 3 Video-Cap. Connection for smoothing capacitor for video control loop 4 Modulation Switch-over for positive and negative modulation 5 Output 2 Symmetrical RF-output 6 Ground Ground 7 Output Symmetrical RF-output 8 AM-Audio Video to audio carrier ratio adjustment and AF-input for AM-modulation 9 FM-Audio OSC FM-audio oscillator; symmetrical inputs for tank circuit 20 FM-Audio OSC FM-audio oscillator; symmetrical inputs for tank circuit Semiconductor Group 4
5 Block Diagram Semiconductor Group 5
6 Absolute Maximum Ratings T A = 0 to 70 o C Parameter Symbol Limit Values Unit Remarks min. typ. max. Supply voltage pin 8 V S V Current from pin 2 I ma V 2 = V V S = V Voltage at pin Voltage at pin 2 Voltage at pin 2 Capacitance at pin 2 Capacitance at pin 3 Voltage at pin 4 Voltage at pin 5 Voltage at pin 7 Voltage at pin 8 V V 2 V C 2 C V 4 V 5 V 7 V V 2 V 2 V V S V S V V V Vpp nf µf V V V V only via C (max. µf) V S = V According to the application circuit, only the provided circuitry can be connected to pins 3,4,6,7,0,,9 and 20. Junction temperature T j 50 o C Storage temperature T stg o C Thermal resistance R th 25 K/W The pins 3, 4, 6 and 7 are not protected against voltage stress. The high frequency performance prohibits the use of adequate protective structures. Operating Range Supply voltage V S V Video input frequency f Video 0 6 MHz Audio input frequency f AF 0 20 khz Output frequency f Q MHz depending on the oscillator circuitry at pins 3-7 Ambient temperature T A 0 70 o C Audio oscillator f OSC 4 7 MHz Voltage at pin 2 Voltage at pin 5,7 V V 5, 7 V 2 V S V V Semiconductor Group 6
7 AC/DC-Characteristics T A = 25 o C; V S = 2 V Parameter Symbol Limit Values Unit Test min. typ. max. Condition Test Circuit Source Current consumption I ma I 2 = 0 ma Reference voltage V V 0 I 2 ma Oscillator Oscillator frequency range Oscillator drift f OSC MHz V D = V f OSC f OSC f OSC Oscillator level α 0; Oscillator output R 0; R 200 impedance C 0; C 2 RF-output imp. RF-output imp. Z 5; Z 7 C 5 = C khz khz khz dbm dbm Ω pf Ω pf t = 5 s-5 min. after switching on T = 25 o C V S = 2 V ± 0% T A = const.; Ch 40 Ch 2 Ch 69 parallel equivalent circuit parallel equivalent circuit static RF-output voltage V Q mvrms Ch 40; video 00% white; without audiosignal RF-output phase α 5, deg RF-output voltage changes V Q 0.5 db f = MHz Intermodulation ratio α IMR db f VC +.07 MHz 2 Harmonic wave ratio α O 35 db f VC MHz without video 2 Semiconductor Group 7
8 AC/DC-Characteristics (cont d) T A = 25 o C; V S = 2 V Parameter Symbol Limit Values Unit Test min. typ. max. Condition Unmodulated video and audio carrier, measured with the spectrum analyzer as difference between video carrier signal level and sideband signal level; loaded Q factor Q L of the audio oscillator resonance circuit adjusted by R P to provide the required video to audio carrier ratio of 2.5 db; Q U = 25 Video to audio carrier ratio α V/A db f VC +f AC (5.5 MHz) Harmonic wave ratio Harmonic wave ratio α O α O db db f VC + 2 f AC ( MHz) f VC + 3 f AC (6.5 MHz) All remaining harmonic waves; multiple of fundamental wave of video carrier, without video signal, measured with spectrum analyzer; f VC = MHz; pin 4 open α 5 db Residual carrier α R 32 db Ch suppression Signal-to-noise in video; unmodulated audio carrier α N/V db Ch Interference product ratio audio in video AM-modulation α A/V db Ch , Test Circuit 4 FM-modulation of audio carrier α A/V db Ch m A = 90% 4 Unweighted AM- Unweighted FMinterference level ratio video in audio α V/A α V/A db db Ch 39; test picture FuBK Ch 39; test picture FuBK 5 5 Signal-to-noise ratio of audio oscillator α N/A α N/A db db AM unmodulated FM-audio carrier 5 5 Video Video input current at pin 2 Video input voltage at pin 2 I 2 0 µa C 2 00 nf V Vpp C 2 00 nf Semiconductor Group 8
9 AC/DC-Characteristics (cont d) T A = 25 o C; V S = 2 V Parameter Symbol Limit Values Unit Test min. typ. max. Condition Modulation depth m D/N % staircase signal at video input; V Video = Vpp Stability of mod. depth m D m D ± 2.5 ± 2.5 % % V Video = Vpp ± 3 db; T A = 0-60 o C Test Circuit m D ± 2.5 % V S = V 6 Differential gain α dif 0 % 7 Differential phase Φ dif 5 deg measured with 7 measurement demodulator, video test signals and vector scope Amplitude response of video signal; V Video = Vpp with additional modulation f = 5 khz-5mhz sine signal between black and white α V 0.5 db 8 Period of time required for peak white detector to reach steady state for full modulation depth with -white pulse per half frame when control is already in the steady state t 6 50 µs C at pin 3 = 0 µf; I leakage 2 µa Setting time for video signal change from 0 Vpp to.4 Vpp; video blanking signal content is uniform white level t µs Setting time for video blanking signal from 00% white level to 42% grey level with subsequent rise in grey level to 7% of video blanking signal (due to decontrol process) t min Audio Audio oscillator frequency range; unloaded Q factor of resonance circuit Q u = 25; f resonance = 5.5 MHz f A/OSC 4 7 MHz Semiconductor Group 9
10 AC/DC-Characteristics (cont d) T A = 25 o C; V S = 2 V Parameter Symbol Limit Values Unit Test min. typ. max. Condition Switch-on, warm-up drift of oscillator frequency; T C -value of capacitor in audio oscillator circuit is 0, the drift is only based on self-heating of component f A/OSC 5 5 khz T A = const.; Audio signal frequency deviation AM-Audio f A/OSC 5 0 khz V S = V; Q u = 25 AM-mod. factor m % V AF = 45 mvrms 9 AM-mod.; total harmonic distortion Audio preamplifier input impedance AM-audio modulator input voltage Residual carrier FM; AM-operation THD AM % m = 80%; V AF = 7 mvrms f AF = khz Z kω V AF 32 mvrms m = 90%; f AF = khz f 20 Hz without AM-audio signal Q U = 25 Test Circuit 9 9 FM-Audio FM-mod.; total harmonic distortion FM-mod.; static mod. characteristic FM-mod.; dynamic mod. characteristic Audio preamplifier input impedance (dynamic) THD FM % V = 50 mvrms 9 f A/OSC ± 50 ± 70 ± 90 khz V AF = V -V 2 = ± V f A/OSC / khz/ V AF mv Z 200 kω Semiconductor Group 0
11 Test Circuit Test and Measurement Circuit for AM- and FM-Audio Carrier and Negative Video Modulation Semiconductor Group
12 Test Circuit 2 Description of the Measurement Configuration to Measure the.07-mhz Moire CC-level lies below the activation point and has been set to provide a ratio of 7 db with respect to the video carrier. f VC = MHz Semiconductor Group 2
13 Test Circuit 3 Description of the Measurement Configuration to Measure the Residual Carrier Suppression Semiconductor Group 3
14 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 (6 khz) adjusted and resultant level as reference a v defined. ) 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 khz or 2 khz or 3 khz adjusted and resultant level is set to a A. The audio noise ratio in video results from a A/V = a A -a V (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 (6 khz) detuned; read out in db to reference level of calibration is a N/V. 3) The noise limit of the measurement device is approx. 85 db. Semiconductor Group 4
15 Test Circuit 5 Description of the Measurement Configuration to Measure the Video and/or Noise in Audio Calibration: Measuring: AF-signal of f = 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. ) The AF-signal is switched off and the FuBK-video signal is connected to the video input with V vid = Vpp. The audio level in relation to the AF-reference calibration level is measured as ratio a V/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 a N/A. Semiconductor Group 5
16 Test Circuit 6 Description of the Measurement Configuration to Measure the Modulation Depth for Positive and Negative Modulation Calibration: Measuring: A zero reference signal with the TV-measuring receiver is given to the video signal. A video signal with V vid = Vpp is connected to the video input. ) Modulation depth m D/N for negative modulation: pin 4 open, range peak white value sync level in relation to range zero reference sync level gives m D/N. 2) Modulation depth m D/P for positive modulation: pin 4 to ground, range peak white value sync level in relation to range zero reference peak white value gives m D/P. Semiconductor Group 6
17 Test Circuit 7 Description of the Measurement Configuration to Measure the Differential Gain and Phase Semiconductor Group 7
18 Test Circuit 8 Description of the Measurement Configuration to Measure the Video Amplitude Response Semiconductor Group 8
19 Test Circuit 9 Description of the Measurement Configuration to Measure the Harmonic Distorsion Factor and AM-Input Voltag Semiconductor Group 9
20 Application Circuit Semiconductor Group 20
21 Diagram Function of Video Signal Connection a) Demodulated RF-output video signal V 5/7rms = f (V 2rms ); f mod = 6 khz b) V 3 = f (V 2rms ) Semiconductor Group 2
22 Plastic Package, P-DSO-20- (SMD) (Plastic Dual Small Outline Package) GPS05094 Sorts of Packing Package outlines for tubes, trays etc. are contained in our Data Book Package Information SMD = Surface Mounted Device Dimensions in mm Semiconductor Group 22
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