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| Multimedia ICs Color TV Signal Encoder BA7232FS The BA7232FS converts analog RGB signals into color TV signals in the NTSC and PAL formats. From inputs of analog RGB signals, a composite synch signal, burst pulses and a color carrier, this IC generates a color TV signal, and can be adapted for either NTSC or PAL standards, which are selected externally. When set to PAL, the BA7232FS changes chroma phase according to the burst flag pulses. The chroma signals and luminosity signals can be combined into a color TV signal or output separately, making this IC suitable for S pins. Also, this IC comes with an output pin for the analog RGB signal. Each output has a built-in 75 driver. *Applications TV peripherals *Featuresadapted for NTSC and PAL formats. 1) Can be 2) Internal flip-flop for PAL phase switching. 3) Separate Y / C output pins. 4) Analog RGB signal output pins. 5) Internal 75 driver. (outputs color TV signals, luminosity signals, chroma signals and analog RGB signals) 6) Adaptable for color subcarrier pulse input. *Block diagram BIN 1 CLAMP BFP GIN 2 CLAMP BFP RIN 3 CLAMP BFP VCC MATRIX BURST GEN. VCC SYNC 16 PHASE GEN. SYNCOUT 17 VCC2 VCC1 4 75 18 ROUT 75 19 GOUT 75 20 BOUT SYNC SYNCIN 5 B - Y MOD. R - Y MOD. SYNC MIX BFPIN 6 75 15 YOUT NT / PAL 7 F*F 14 N.C. Y/C MIX SCIN 8 FILTER 75 13 VOUT GND1 9 GND 12 N.C. COUT 10 75 GND 11 GND2 1 Multimedia ICs BA7232FS *Pin descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Pin name BIN GIN RIN VCC1 SYNCIN BFPIN NT / PAL SCIN GND1 COUT GND2 N.C. VOUT N.C. YOUT SYNCOUT VCC2 ROUT GOUT BOUT Analog B signal input Analog G signal input Analog R signal input Power supply pin for all drivers other than the 75 driver Composite synchronization signal input (negative logic) Burst flag pulse input (negative logic) Selecting the type of color TV signal output (high = NTSC, low = PAL) Color subcarrier input Ground for all drivers other than the 75 driver Chroma signal output. Internal 75 driver. Ground for the 75 driver This pin is not connected inside the IC. Color TV signal output. Internal 75 driver. This pin is not connected inside the IC. Luminance signal output. Internal 75 driver. Composite synchronization signal output Power supply pin for all drivers other than the 75 driver Analog R signal output. Internal 75 driver Analog G signal output. Internal 75 driver. Analog B signal output. Internal 75 driver. Function *Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 7 750 - 20 ~ + 70 - 55 ~ + 125 Unit V mW C C Reduced by 7.5mW for each increase in Ta of 1C over 25C. When mounted on a 70 x 70 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 ~ 0.6 Unit V VP-P VP-P VP-P VP-P 2 Multimedia ICs BA7232FS *Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 5V, XTAL = 3.58MHz) Parameter Current dissipation Luminance level Luminance level R YOUT Luminance level G VOUT Luminance level B Synchronization level Synchronization / luminance level ratio R / burst level ratio G / burst level ratio B / burst level ratio R phase G phase COUT B phase VOUT Burst level Carrier leak PAL burst phase PAL burst level ratio SYNCOUT Output level (HIGH) Output level (LOW) Symbol ICC L L(R) L(G) L(B) S RS/L RR/BU RG/BU RB/BU R G B BU CL BU+ BU- RBU -- -- RO GO BO VYO VCO VVO VRO VGO VBO VIL Min. 33.0 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 2.00 0 0.63 0.63 0.63 1.60 2.20 1.35 1.25 1.25 1.25 -- Typ. 48.0 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 2.50 -- 0.70 0.70 0.70 2.00 2.60 1.75 1.65 1.65 1.65 -- Max. 63.0 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 5.00 0.40 0.77 0.77 0.77 2.40 3.00 2.15 2.05 2.05 2.05 0.8 Unit mA VP-P VP-P VP-P VP-P VP-P -- -- -- -- deg deg deg VP-P mVP-P deg deg -- V V VP-P VP-P VP-P V V V V V V V RI = 0.7VP-P GI = 0.7VP-P BI = 0.7VP-P -- -- -- -- -- -- -- RYO = S / L RI = 0.7VP-P1 GI = 0.7VP-P1 BI = 0.7VP-P1 1 1 1 3 2 Conditions -- RI = GI = BI = 0.7VP-P RI = 0.7VP-P1 GI = 0.7VP-P1 BI = 0.7VP-P1 -- SW1 = 21 SW1 = 21 SW1 = 21 -- -- ROUT output level GOUT output level BOUT output level YOUT DC voltage COUT DC voltage VOUT DC voltage ROUT DC voltage GOUT DC voltage BOUT DC voltage Input voltage "L" level SYNC, BFP, NT / PAL Input voltage "H" level SYNC, BFP, NT / PAL Input impedance SYNC, BFP, NT / PAL VIH 2.2 -- -- V -- -- ZI 8 13.5 -- k 1 Guaranteed performance. 2 Measured 3.5 s after burst with a 3.58 MHz BPF. 3 Measured with a 3.58 MHz BPF. Not designed for radiation resistance. 3 Multimedia ICs BA7232FS *Measurement circuit 0.1 BIN input 1 CLAMP BFP 0.1 GIN input 2 CLAMP BFP 0.1 RIN input 3 CLAMP BFP VCC VCC 4 MATRIX BURST GEN. VCC SYNC 16 SYNC PHASE GEN. 2K SYNC MIX 17 SYNCOUT measurement point VCC 75 75 19 75 20 + 220 75 BOUT measurement point 75 75 GOUT measurement point 75 75 ROUT measurement point 75 + 220 + 18 220 Composite synch 5 R - Y MOD. B - Y MOD. Burst flag pulse (BFP) VCC 6 75 15 + 220 75 YOUT measurement point 75 F*F 1 7 2 Color subcarrier 4.7k SW1 0.1 8 560 14 Y/C MIX FILTER 75 13 + 220 75 VOUT measurement point 75 9 GND 12 75 COUT measurement point 75 0.47 10 75 GND 11 4 Multimedia ICs BA7232FS *Circuit operation composite synch input. During low (1) SYNCIN is for input, the synchronization signal is output to YOUT, VOUT and SYNCOUT. (2) BFP is for burst flag pulse input. During low input, the burst signal is output to pins CO and VO. When the IC is set to PAL, it is this signal that directs the phase inversion of the chroma signals. This signal also controls the timing of the pedestal clamps of RIN, GIN and BIN. During low input, the pedestal levels of RIN, GIN and BIN are kept constant by charging an attached capacitor. (3) NT / PAL is the NTSC / PAL selector pin, and connects to VCC when set to NTSC and to GND when set to PAL. (4) SCIN is for color subcarrier input. Set input to a pulse wave or sine wave (3.579545MHz for NTSC and 4.433619MHz for PAL). (5) COUT and YOUT are for output of chroma signals and luminosity signals, respectively. Because the chroma signal and luminosity signals can be output separately, the IC can be adapted for S pins. Each has a 75 driver. (6) VOUT is for color TV signal output, and has an internal 75 driver. (7) ROUT, GOUT and BOUT are for analog RGB signal output, and have an internal 75 driver. The relationship between chroma phase and burst phase during PAL processing is as follows. NT / PAL BFP Chroma phases burst B-Y R-Y B-Y B-Y burst R-Y burst R-Y 5 Multimedia ICs BA7232FS *Application example (NTSC color TV signals) 0.1 Analog B signal 1 CLAMP BFP 0.1 Analog G signal 2 CLAMP BFP 0.1 Analog R signal 3 CLAMP BFP VCC VCC 4 MATRIX BURST GEN. VCC SYNC Composite synch output Composite synch 5 SYNC PHASE GEN. 16 17 VCC 75 18 75 19 75 20 Burst flag pulse (BFP) R - Y MOD. B - Y MOD. SYNC MIX 6 75 15 F*F VCC 7 14 Y/C MIX Color subcarrier 4.7k 0.1 8 560 FILTER 75 13 + 220 75 Color TV signal output 9 GND 12 10 75 GND 11 *Operation notes at the input terminals should be as (1) Input impedance low as possible as the analog RGB signal is clamped there. (2) The color subcarrier should have a duty of 50%. Duty fluctuation will affect chroma phase. Resistancesplitting input is used in the "Application example" to accommodate 5VP-P CMOS input. For other types of input, adjust to 0.5VP-P at SCIN. (3) Composite synch and burst flag pulse inputs should conform to their respective standards, as improper timing between them can prevent the TV from displaying color images. For input, use the TTL level and an impedance of 8k. *External dimensions (Units: mm) 8.7 0.2 20 7.8 0.3 5.4 0.2 11 1 1.8 0.1 10 0.11 0.8 0.36 0.1 0.3Min. 0.15 SSOP - A20 6 0.15 0.1 |
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