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| Video ICs Test pattern generator BA7004 The BA7004 is a test signal generator for VCRs that can be used to tune the receiving frequency of television tuners to the RF converter output frequency of VCRs. When a TV is receiving a television broadcast through a VCR, the TV receiving frequency must match the RF converter output frequency of the VCR for the broadcast image to be displayed. Particulary for UHF-band VCRs (PAL and SECAM), when an electronic tuner is used in the VCR, the RF converter is a multi-channel variable type, and electronic tuning is used in the television as well, it is extremely difficult to match the channel frequencies for the two pieces of equipment. Tuning is done by connecting a test signal generator or using a video tape with a recorded test signal and adjusting the television receiver's tuning dials. The BA7004 has been designed to operate with a minimum number of external components and it uses a ceramic oscillator to give an accurate video signal (horizontal sync signal and white signal). Unlike the conventional multivibrator method, use of the BA7004 allows the horizontal sync signal settinng adjustment procedure to be eliminated which facilitates adjustment and leads to cost savings. *Features components required. 1) Few external 2) Provides an accurate video signal without adjustment. 3) Good temperature stability. *Block diagram GND 3 VCC 1 BA7004 REGULATOR BUFFER OSCILLATOR WAVE SHAPER DIVIDER LEVEL CONTROL 2 OUTPUT 4 5 *Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Driving current Symbol VCC Pd Topr Tstg IO Limits 15 400 - 10 ~ + 75 - 55 ~ + 125 10 Unit V mW C C mA Reduced by 4.0mW for each increase in Ta of 1C over 25C. 1 Video ICs BA7004 *Electrical characteristics (unless otherwise noted, Ta = 25C and VCC = 9V) Parameter VS ratio Horizontal sync frequency variation Horizontal sync signal width variation Operating voltage Quiescent current Peak level SYNC - 1st white signal rise time SYNC - 2nd white signal rise time White signal width variation Symbol VS Min. Typ. Max. Unit Conditions 7.0: 3.0 6.5: 3.5 6.0: 4.0 -- 3.8 8 4.5 1.7 22 38 3.8 15.625 4.2 9 9 1.9 24 40 4.3 -- 4.6 13 12.5 2.1 26 42 4.8 -- kHz s V mA V s s s -- When the CSB500E5 is used fS HS VCC IQ VP-P TV (1) TV (2) HV -- -- -- -- -- -- -- *Measurement circuits TV (1) V VCC VP-P (20s) HV HV (12s) (20s) 1 BA7004 5 CERALOCK CSB500E5 C0 C1 4700pF C2 4700pF 4 3 2 S TV (2) 1 / fs (64s) + 1F OUT RL 1k HS HS Note: Values in parentheses are typical values. Fig.1 Fig. 2 Output waveform *Attached components (1) Ceramic resonator Trade name ****** CERALOCK CSB500E5 (2) C1 and C2 4700pF (recommended) (3) Co Output coupling capacitor (4) RL Load resistor. Normally the load of the IC is the RF converter video-signal input impedance. 2 Video ICs BA7004 *Application example ANT Video tape VTR test signal switch RF RF converter output VCR video signal processor Tuner BA7004 TV video signal processor TV Tuner Tuning dial Antenna input Fig. 3 Connection example *Electrical characteristic curves (Ta = 25C) OSCILLATING FREQUENCY DRIFT (%) OSCILLATING FREQUENCY SHIFT (%) OSCILLATING FREQUENCY SHIFT (%) + 0.5 + 0.5 C1 = 4700pF : Const. VCC = 9V + 0.5 C1 = C2 (x 1000pF) VCC = 9V 0 0 0 - 0.5 - 0.5 - 0.5 7 9 11 13 15 1 2 4 1 2 4 10 POWER SUPPLY VOLTAGE: VCC (V) C2 / C1 (x 1000pF) CAPACITOR: C1, C2 (x 1000pF) Fig. 4 Oscillation frequency vs. power supply voltage + 1.0 OSCILLATING FREQUENCY DRIFT (%) C1 = C2 = 4700pF VCC = 9V + 0.5 Fig. 5 Oscillation frequency vs. C2 / C1 Fig. 6 Oscillation frequency vs. C2, C1 *External dimensions (Units: mm) 11.8 0.2 4.9 0.2 2.4 0.2 9.6 0.5 1.2 0 1 3.5 0.5 2.54 0.6 5 0.6 0.8 1.3 0.3 0.1 - 0.5 - 1.0 - 40 0 40 80 AMBIENT TEMPERATURE: Ta (C) SIP5 Fig. 7 Oscillation frequency drift vs. ambient temperature 3 |
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