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| Multimedia ICs Color TV signal encoder BA7242F The BA7242F is an IC which converts analog RGB signals to NTSC and PAL color TV signals. In addition to composite output, luminance output, chrominance output, and analog RGB output are available. Each type of output is equipped with an internal 75 driver. *Applicationsdevices TV peripheral *Features both NTSC and PAL systems. 1) Supports 2) Internal flip-flop circuit for PAL common mode switching 3) Equipped with Y / C separated output pin. 4) Internal 75 driver 5) Supports subcarrier pulse for color input *Block diagram SYNC BIN 1 CLAMP MATRIX BFP GIN 2 CLAMP BFP RIN 3 CLAMP BFP B-Y MOD VCC1 4 GND VCC 11 GND2 SYNC MIX VCC 14 VCC2 13 YOUT Y/C MIX 12 VOUT SYNC 5 CHROMA GEN SYNC 10 COUT BURST FLAG R-Y MOD BFP 6 F*F 9 NT / PAL NT / PAL GND NT / PAL FILTER PHASE GEN GND1 7 8 SCIN 1 Multimedia ICs BA7242F *Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 7 450 - 20 ~ + 70 - 55 ~ + 125 Unit V mW C C Reduced by 4.5mW for each increase in Ta of 1C over 25C. (When mounted on a 70mm x 70mm x 1.6mm glass epoxy board.) *Recommended operating conditions (Ta = 25C) Parameter Power supply voltage RIN input level GIN input level BIN input level SCIN input level Symbol VCC RI GI BI SC Limits 4.5 ~ 5.5 0 ~ 0.7 0 ~ 0.7 0 ~ 0.7 0.45 ~ 0.60 Unit V VP-P VP-P VP-P VP-P *Pin descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin name BIN GIN RIN VCC1 SYNC BFP GND1 SCIN NT / PAL COUT GND2 VOUT YOUT VCC2 Function Input for analog B signal. Operate with low impedance. Input for analog G signal. Operate with low impedance. Input for analog R signal. Operate with low impedance. VCC for all except 75 driver. Input for composite SYNC signal. Outputs SYNC signal to VOUT and YOUT pins when input is LOW. Input for burst timing signal. Simultaneously performs the burst output and initiates the pedestal clamp for the RIN, GIN, and BIN input signals when input is LOW. GND for all except 75 driver. 3.58MHz or 4.43MHz pulse signal input. Video signal output mode setting. HIGH level = NTSC, LOW level = PAL. Chrominance signal output. Internal 75 driver. GND for 75 driver. Composite video signal output. Internal 75 driver. Luminance signal output. Internal 75 driver. VCC for 75 driver. 2 Multimedia ICs BA7242F *Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 5V, SCIN = 3.579545MHz, NT / PAL = 5V) Parameter Current consumption Luminance level Luminance level R YOUT VOUT Luminance level G Luminance level B Synchronization level Synchronization / luminance level ratio Red / burst level ratio Green / burst level ratio Blue / burst level ratio Red phase Green phase COUT VOUT Blue phase Burst level Carrier leak PAL burst phase PAL burst ratio YOUT DC voltage COUT DC voltage VOUT DC Voltage High level input voltage SYNC, BFP, NT / PAL Low level input voltage SYNC, BFP, NT / PAL Input current during high SYNC, BFP, NT / PAL Input current during low SYNC, BFP, NT / PAL Symbol ICC L L(R) L(G) L(B) S R S/L R R / BU R G / BU R B / BU R G B BU CL BU + BU - R BU V YO V CO V VO V IH V IL V IH V IL Min. 23 0.63 0.19 0.37 0.07 0.27 0.38 2.84 2.65 2.01 94 231 337 0.26 -- 125 215 0.9 1.60 2.20 1.35 2.0 -- -- -- Typ. 34 0.70 0.21 0.41 0.08 0.30 0.43 3.16 2.95 2.24 104 241 347 0.29 -- 135 225 1.0 2.00 2.60 1.75 -- -- -- -- Max. 45 0.77 0.23 0.45 0.09 0.33 0.48 3.48 3.25 2.47 114 251 357 0.32 35 145 235 1.1 2.40 3.00 2.15 -- 0.8 300 200 Unit mA VP-P VP-P VP-P VP-P VP-P -- -- -- -- deg deg deg VP-P mVP-P deg deg -- V V V V V A A With 5V applied With 0V applied RYO = YS / YL RI = 0.7VP-P2 GI = 0.7VP-P2 BI = 0.7VP-P2 2 2 2 4 3 Conditions RI = GI = BI = 0.7VP-P RI = 0.7VP-P2 GI = 0.7VP-P2 BI = 0.7VP-P2 NT / PAL = 0V2 NT / PAL = 0V2 NT / PAL = 0V2 2 Guaranteed design with these parameters 3 Measured using a 3.58MHz BPF for 3.5s after the burst. 4 Measured using a 3.58MHz BPF. Not designed for radiation resistance 3 Multimedia ICs BA7242F *Measurement circuit SYNC 0.1 BIN input 1 CLAMP SYNC MIX VCC VCC 14 0.1 GIN input 2 MATRIX BFP CLAMP 75 13 220 75 75 12 220 75 YOUT measurement point Y/C MIX 0.1 RIN input 3 BFP BFP CLAMP VOUT measurement point GND VCC VCC B-Y MOD 4 11 CHROMA GEN SYNC 75 10 0.47 75 Vcc 9 NT / PAL COUT measurement point Composite SYNC 5 BURST FLAG R-Y MOD Burst flag pulse (BFP) 6 F*F NT / PAL GND 0.1 8 560 4.7k Color subcarrier *Operation description is input to the SYNCIN pin. (1) The composite SYNC During Low level input, the SYNC signal is output to the YOUT, VOUT, and SYNCOUT pins. (2) The burst flag pulse is input to the BFPIN pin. During Low level input, the burst signal is output to the COUT and VOUT pins. For PAL, the phase inversion of the chroma signal occurs according to this signal. Furthermore, this signal also acts as the timing for the pedestal clamp for the RIN, GIN, and BIN pins. By using an external condenser for charging during Low level input, the pedestal levels for the RIN, GIN, and BIN pins are maintained at a uniform level. (3) The NT / PAL pin is for selecting either NTSC or PHASE GEN 7 PAL. For NTSC, this pin is connected to VCC and for PAL, this pin is connected to GND. (4) The SCIN pin is the color subcarrier input pin. Input either a pulse wave or a sine wave of frequency 3.579545MHz for NTSC or of frequency 4.433619MHz for PAL. (5) The COUT pin is the output pin for the chroma signal, and the YOUT pin is the output pin for the luminance signal. This is compatible with the S pin because the chroma signal and the luminance signal can be output separately. Both pins have internal 75 drivers. (6) The VOUT pin is the output pin for a color TV signal and has an internal 75 driver. 4 FILTER Multimedia ICs BA7242F *Application example (When using NTSC color TV signal) 0.1 Analog B signal 1 CLAMP SYNC MIX SYNC VCC VCC 14 0.1 Analog G signal 2 MATRIX BFP CLAMP 13 Y/C MIX 0.1 Analog R signal 3 BFP BFP CLAMP 12 + 220 75 Color TV signal output B-Y MOD 4 GND VCC VCC 11 Composite SYNC 5 CHROMA GEN SYNC 10 BURST FLAG R-Y MOD Burst flag pulse (BFP) 6 F*F VCC 9 NT / PAL PHASE GEN FILTER 7 NT / PAL 0.1 8 560 4.7k Color subcarrier *Operation notesRGB signals perform clamping at the (1) Since analog input pin, input them with a low impedance. (2) Input a signal of duty 50% for the color subcarrier. If the duty fluctuates, it will affect the chroma phase. Furthermore, for the application example, a voltagedividing resistor is assumed for the CMOS input of 5VP-P. For other input formats, regulate the SCIN pin for 0.5VP-P. (3) Input the composite SYNC and burst flag pulse according to the standard value. If the timing is off, the TV receiver may not show any color. As well, set the input level the same as the TTL level. The input impedance is 8k. GND *External dimensions (Units: mm) 8.7 0.2 14 6.2 0.3 4.4 0.2 8 1.5 0.1 1 7 0.11 1.27 0.4 0.1 0.3Min. 0.15 SOP14 0.15 0.1 5 |
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