Q67000-A5167

Video Modulator for FM/AM-Audio with PLL-Output Preliminary Data Features q q q q q q q q q q q q TDA 5670-5X Bipolar IC 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 12 V supply voltage P-DSO-20 -1 Type TDA 5670-5X TDA 5670-5X Ordering Code Q67000-A5167 Q67006-A5167 Package P-DSO-20-1 (SMD) P-DSO-20-1 Tape & Reel Functional Description and Application The monolitic integrated circuit TDA 5670-5X 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 1 04.95 TDA 5670-5X 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 15-17 of approximately 80 dB. For optimal residual carrier suppression, the symmetrical mixer outputs at pins 15, 17 should be connected to a matched balanced-to-unbalanced broadband transformer, e.g. a Guanella transformer with good phase precision at 0o and 180o. 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 12. 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 13, 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 14 is connected to ground. By varying the value of resistance R at pin 14 between ∞ ... 0 Ω the modulation depth can be increased from 70% to 100% when the modulation is negative and decreased from 100% to 70% when the modulation is positive. Audio Via pin 1, 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 19, 20. The unloaded Q of the resonant circuit must be Q = 25 and the parallel resistor RT = 8.2 kΩ to ensure a video to audio carrier ratio of 12.5 dB. At the same time, the capacitative and/or inductive reactance for the resonance frequency should have a value of XC ≈ XL ≈ 800 Ω. Via pin 18, 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 18. The video to audio carrier ratio can be changed by connecting an external voltage to pin 18, which deviates from the internal reference voltage. Through an additional external dc voltage at pin 18, 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 TDA 5670-5X Pin Configuration (top view) P-DSO-20-1 Semiconductor Group 3 TDA 5670-5X Pin Definitions and Functions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol FM-Audio VREF OSC-Input 1 OSC-Out 1 OSC-Ground OSC-Out 2 OSC-Input 2 VS N.C. PLL-Out 1 PLL-Out 2 Video Video-Cap. Modulation Output 2 Ground Output 1 AM-Audio FM-Audio OSC FM-Audio OSC Function AF-input for FM-modulation Internal reference voltage (7.5 V) Symmetrical oscillator input Symmetrical oscillator output Oscillator ground Symmetrical oscillator output Symmetrical oscillator input Supply voltage (12 V) Not connected Symmetrical unmodulated oscillator output Symmetrical unmodulated oscillator output Video input with clamping Connection for smoothing capacitor for video control loop Switch-over for positive and negative modulation Symmetrical RF-output Ground Symmetrical RF-output Video to audio carrier ratio adjustment and AF-input for AM-modulation FM-audio oscillator; symmetrical inputs for tank circuit FM-audio oscillator; symmetrical inputs for tank circuit Semiconductor Group 4 TDA 5670-5X Block Diagram Semiconductor Group 5 TDA 5670-5X Absolute Maximum Ratings TA = 0 to 70 oC Parameter Supply voltage pin 8 Current from pin 2 Voltage at pin 1 Voltage at pin 2 Voltage at pin 12 Capacitance at pin 2 Capacitance at pin 13 Voltage at pin 14 Voltage at pin 15 Voltage at pin 17 Voltage at pin 18 Symbol min. VS –I2 V1 V2 V10 C2 C13 V14 V15 V17 V18 – 0.3 0 0 6 0 0 0 – 0.3 V2 V2 V2-1.5 Limit Values typ. 2 2 8.5 1.5 100 15 1.4 VS VS V2+1.5 max. 14.5 V mA V V Vpp nF µF V V V V V2 = 7...8 V VS = 10...13.5 V Unit Remarks only via C (max. 1 µF) VS = 10-13.5 V According to the application circuit, only the provided circuitry can be connected to pins 3,4,6,7,10,11,19 and 20. Junction temperature Storage temperature Thermal resistance Tj Tstg Rth – 40 150 125 125 oC oC 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 Video input frequency Audio input frequency Output frequency VS fVideo fAF fQ 10 0 0 30 13.5 6 20 860 V MHz kHz MHz depending on the oscillator circuitry at pins 3-7 Ambient temperature Audio oscillator Voltage at pin 2 Voltage at pin 15,17 TA fOSC V2 V15, 17 0 4 6.75 V2 70 7 7.75 VS oC MHz V V Semiconductor Group 6 TDA 5670-5X AC/DC-Characteristics TA = 25 oC; VS = 12 V Parameter Symbol min. Source Current consumption I8 Reference voltage V2 Oscillator Oscillator frequency range Oscillator drift fOSC ∆fOSC ∆fOSC ∆fOSC Oscillator level Oscillator output impedance α10;11 R10; R11 C10; C11 RF-output imp. RF-output imp. RF-output voltage Z15; Z17 C15 = C17 0.5 VQ 2.5 –20 –20 200 2 150 1 4.5 470 900 200 800 400 MHz kHz kHz kHz dBm dBm Ω pF Ω pF VD = 0...28 V 1 t = 5 s-15 min. after switching on 1 ∆T = 25 oC 1 VS = 12 V ± 10% TA = const.; Ch 40 Ch 21 Ch 69 parallel equivalent circuit parallel equivalent circuit static 1 1 1 1 1 22 6.75 28 7.25 34 7.75 mA V I2 = 0 mA 0 ≤ I2 ≤ 1 mA 1 1 Limit Values typ. max. Unit Test Condition Test Circuit 2.0 5.5 mVrms Ch 40; video 100% white; without audiosignal deg dB dB dB f = 470-900 MHz fVC + 1.07 MHz fVC + 8.8 MHz without video RF-output phase RF-output voltage changes α15, 17 ∆VQ 140 0 50 35 180 220 1.5 Intermodulation ratio αIMR Harmonic wave ratio αO 75 2 2 Semiconductor Group 7 TDA 5670-5X AC/DC-Characteristics (cont’d) TA = 25 oC; VS = 12 V Parameter Symbol min. Limit Values typ. max. Unit Test Condition Test Circuit Unmodulated video and audio carrier, measured with the spectrum analyzer as difference between video carrier signal level and sideband signal level; loaded Q factor QL of the audio oscillator resonance circuit adjusted by RP to provide the required video to audio carrier ratio of 12.5 dB; QU = 25 Video to audio carrier ratio αV/A 10 35 42 12.5 48 48 15 dB dB dB fVC+fAC (5.5 MHz) 1 fVC + 2 fAC (11 MHz) fVC + 3 fAC (16.5 MHz) 1 1 Harmonic wave ratio αO Harmonic wave ratio αO All remaining harmonic waves; multiple of fundamental wave of video carrier, without video signal, measured with spectrum analyzer; fVC = 523.25-623.25 MHz; pin 14 open α Residual carrier suppression Signal-to-noise in video; unmodulated audio carrier Interference product ratio audio in video AM-modulation FM-modulation of audio carrier Unweighted AMUnweighted FMinterference level ratio video in audio Signal-to-noise ratio of audio oscillator Video Video input current at pin 12 Video input voltage at pin 12 –I12 V12 0 0.7 1 1.4 µA Vpp C12 ≤ 100 nF C12 ≤ 100 nF 1 1 αR αN/V 15 32 48 74 dB dB dB Ch 30...40 Ch 30...40 1 3 4 αA/V αA/V αV/A αV/A 49 48 48 48 62 60 54 54 dB dB dB dB Ch 30...40, Ch 30...40 mA = 90% Ch 39; test picture FuBK Ch 39; test picture FuBK AM unmodulated FM-audio carrier 4 4 5 5 αN/A αN/A 48 48 54 54 dB dB 5 5 Semiconductor Group 8 TDA 5670-5X AC/DC-Characteristics (cont’d) TA = 25 oC; VS = 12 V Parameter Modulation depth Symbol min. mD/N 60 Limit Values typ. 70 max. 80 % Unit Test Condition staircase signal at video input; VVideo = 1 Vpp ∆VVideo = 1 Vpp ± 3 dB; TA = 0-60 oC VS = 10-13.5 V measured with measurement demodulator, video test signals and vector scope Test Circuit 6 Stability of mod. depth ∆mD ∆mD ∆mD 1 1 1 ± 2.5 ± 2.5 ± 2.5 10 15 % % % % deg 6 6 6 7 7 Differential gain Differential phase αdif Φdif Amplitude response of video signal; VVideo = 1 Vpp with additional modulation f = 15 kHz-5MHz sine signal between black and white αV 0 1.5 dB 8 Period of time required for peak white detector to reach steady state for full modulation depth with 1-white pulse per half frame when control is already in the steady state t 6 50 µs C at pin 13 = 10 µF; I leakage ≤ 2 µA 1 Setting time for video signal change from 0 Vpp to 1.4 Vpp; video blanking signal content is uniform white level t 120 500 µs 1 Setting time for video blanking signal from 100% white level to 42% grey level with subsequent rise in grey level to 71% of video blanking signal (due to decontrol process) t Audio Audio oscillator frequency range; unloaded Q factor of resonance circuit Qu = 25; fresonance = 5.5 MHz fA/OSC 4 7 MHz 1 0.4 2 10 min 1 Semiconductor Group 9 TDA 5670-5X AC/DC-Characteristics (cont’d) TA = 25 oC; VS = 12 V Parameter Symbol min. Limit Values typ. max. Unit Test Condition Test Circuit Switch-on, warm-up drift of oscillator frequency; TC-value of capacitor in audio oscillator circuit is 0, the drift is only based on self-heating of component ∆ fA/OSC Audio signal frequency deviation AM-Audio AM-mod. factor AM-mod.; total harmonic distortion Audio preamplifier input impedance AM-audio modulator input voltage Residual carrier FM; AM-operation FM-Audio FM-mod.; total harmonic distortion FM-mod.; static mod. characteristic FM-mod.; dynamic mod. characteristic Audio preamplifier input impedance (dynamic) THDFM ∆ fA/OSC ∆ fA/OSC/ ∆VAF Z1 ± 50 0.08 200 0.6 ± 70 0.10 1.5 ± 90 0.13 % kHz kHz/ mV kΩ V1 = 150 mVrms ∆VAF= V1-V2 = ±1V 9 1 1 1 m THDAM 20 30 0.5 40 3 % % VAF = 45 mVrms m = 80%; VAF = 117 mVrms fAF = 1 kHz 9 9 ∆ fA/OSC 5 5 15 10 kHz kHz TA = const.; VS = 10.0-13.5 V; Qu = 25 1 1 Z16 VAF ∆f 25 50 132 20 75 kΩ mVrms m = 90%; fAF = 1 kHz Hz without AM-audio signal QU = 25 1 9 1 Semiconductor Group 10 TDA 5670-5X Test Circuit 1 Test and Measurement Circuit for AM- and FM-Audio Carrier and Negative Video Modulation Semiconductor Group 11 TDA 5670-5X Test Circuit 2 Description of the Measurement Configuration to Measure the 1.07-MHz Moire CC-level lies below the activation point and has been set to provide a ratio of 17 dB with respect to the video carrier. f VC = 623.25 MHz Semiconductor Group 12 TDA 5670-5X Test Circuit 3 Description of the Measurement Configuration to Measure the Residual Carrier Suppression Semiconductor Group 13 TDA 5670-5X 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 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 (16 kHz) adjusted and resultant level as reference av defined. 1) 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 1 kHz or 2 kHz or 3 kHz adjusted and resultant level is set to aA. The audio noise ratio in video results from aA/V = aA-aV (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 (16 kHz) detuned; read out in dB to reference level of calibration is aN/V. 3) The noise limit of the measurement device is approx. 85 dB. Calibration: Semiconductor Group 14 TDA 5670-5X Test Circuit 5 Description of the Measurement Configuration to Measure the Video and/or Noise in Audio Calibration: AF-signal of f = 1 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. 1) The AF-signal is switched off and the FuBK-video signal is connected to the video input with Vvid = 1 Vpp. The audio level in relation to the AF-reference calibration level is measured as ratio aV/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 aN/A. Measuring: Semiconductor Group 15 TDA 5670-5X 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 Vvid = 1 Vpp is connected to the video input. 1) Modulation depth mD/N for negative modulation: pin 14 open, range peak white value – sync level in relation to range zero reference – sync level gives mD/N. 2) Modulation depth mD/P for positive modulation: pin 14 to ground, range peak white value – sync level in relation to range zero reference – peak white value gives mD/P. Semiconductor Group 16 TDA 5670-5X Test Circuit 7 Description of the Measurement Configuration to Measure the Differential Gain and Phase Semiconductor Group 17 TDA 5670-5X Test Circuit 8 Description of the Measurement Configuration to Measure the Video Amplitude Response Semiconductor Group 18 TDA 5670-5X Test Circuit 9 Description of the Measurement Configuration to Measure the Harmonic Distorsion Factor and AM-Input Voltag Semiconductor Group 19 TDA 5670-5X Application Circuit Semiconductor Group 20 TDA 5670-5X Diagram Function of Video Signal Connection a) Demodulated RF-output video signal V15/17rms = f (V12rms); fmod = 16 kHz b) V13 = f (V12rms) Semiconductor Group 21 TDA 5670-5X Plastic Package, P-DSO-20-1 (SMD) (Plastic Dual Small Outline Package) 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 GPS05094