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 75Ω driver. •TVApplications peripherals •1)Features Can be adapted for NTSC and PAL formats. 5) Internal 75Ω driver. (outputs color TV signals, luminosity signals, chroma signals and analog RGB signals) 6) Adaptable for color subcarrier pulse input. 2) Internal flip-flop for PAL phase switching. 3) Separate Y / C output pins. 4) Analog RGB signal output pins. •Block diagram BIN CLAMP 1 75Ω 20 BOUT 75Ω 19 GOUT 75Ω 18 ROUT 17 VCC2 16 SYNCOUT 15 YOUT 14 N.C. 13 VOUT 12 N.C. 11 GND2 BFP GIN CLAMP 2 BFP RIN CLAMP 3 BFP VCC BURST GEN. NT / PAL 7 SCIN 8 FILTER GND1 9 COUT 10 PHASE GEN. SYNC MIX 6 R - Y MOD. BFPIN B - Y MOD. 5 SYNC SYNCIN SYNC Y/C MIX VCC 4 F•F VCC1 MATRIX 75Ω 75Ω GND 75Ω GND 1 Multimedia ICs BA7232FS •Pin descriptions Pin No. Pin name 1 BIN Analog B signal input 2 GIN Analog G signal input 3 RIN Analog R signal input 4 VCC1 Power supply pin for all drivers other than the 75Ω driver 5 SYNCIN Composite synchronization signal input (negative logic) 6 BFPIN 7 NT / PAL Function Burst flag pulse input (negative logic) Selecting the type of color TV signal output (high = NTSC, low = PAL) 8 SCIN Color subcarrier input 9 GND1 Ground for all drivers other than the 75Ω driver 10 COUT Chroma signal output. Internal 75Ω driver. 11 GND2 12 N.C. 13 VOUT 14 N.C. 15 YOUT 16 SYNCOUT 17 VCC2 Ground for the 75Ω driver This pin is not connected inside the IC. Color TV signal output. Internal 75Ω driver. This pin is not connected inside the IC. Luminance signal output. Internal 75Ω driver. Composite synchronization signal output Power supply pin for all drivers other than the 75Ω driver 18 ROUT Analog R signal output. Internal 75Ω driver 19 GOUT Analog G signal output. Internal 75Ω driver. 20 BOUT Analog B signal output. Internal 75Ω driver. •Absolute maximum ratings (Ta = 25°C) Parameter Symbol Limits Unit VCC 7 V Pd 750∗ mW Operating temperature Topr – 20 ~ + 70 °C Storage temperature Tstg – 55 ~ + 125 °C Power supply voltage Power dissipation ∗ Reduced by 7.5mW for each increase in Ta of 1°C over 25°C. When mounted on a 70 × 70 × 1.6mm glass epoxy board. •Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage 2 Symbol Limits Unit VCC 4.5 ~ 5.5 V RIN input level υRI 0 ~ 0.7 VP-P GIN input level υGI 0 ~ 0.7 VP-P BIN input level υBI 0 ~ 0.7 VP-P SCIN input level υSC 0.45 ~ 0.6 VP-P Multimedia ICs BA7232FS •Electrical characteristics (unless otherwise noted, Ta = 25°C, V CC Parameter = 5V, XTAL = 3.58MHz) Symbol Min. Typ. Max. Unit Conditions ICC 33.0 48.0 63.0 mA — Current dissipation υL 0.63 0.70 0.77 VP-P υRI = υGI = υBI = 0.7VP-P Luminance level R υL(R) 0.19 0.21 0.23 VP-P υRI = 0.7VP-P∗1 YOUT Luminance level G VOUT Luminance level B υL(G) 0.37 0.41 0.45 VP-P υGI = 0.7VP-P∗1 υL(B) 0.07 0.08 0.09 VP-P υBI = 0.7VP-P∗1 Luminance level Synchronization level υS 0.27 0.30 0.33 VP-P Synchronization / luminance level ratio R S/L 0.38 0.43 0.48 — RYO = υS / υL R / burst level ratio R R/BU 2.84 3.16 3.48 — υRI = 0.7VP-P∗1 G / burst level ratio R G/BU 2.65 2.95 3.25 — υGI = 0.7VP-P∗1 B / burst level ratio R B/BU 2.01 2.24 2.47 — υBI = 0.7VP-P∗1 θR 94 104 114 deg ∗1 θG 231 241 251 deg ∗1 θB 337 347 357 deg ∗1 υBU 0.26 0.29 0.32 VP-P ∗3 υCL — — 35 mVP-P ∗2 θBU+ 125 135 145 deg SW1 = 2∗1 θBU– 215 225 235 deg SW1 = 2∗1 RBU 0.9 1.0 1.1 — SW1 = 2∗1 Output level (HIGH) — 2.00 2.50 5.00 V — Output level (LOW) — 0 — 0.40 V — ROUT output level υRO 0.63 0.70 0.77 VP-P υRI = 0.7VP-P GOUT output level υGO 0.63 0.70 0.77 VP-P υGI = 0.7VP-P BOUT output level υBO 0.63 0.70 0.77 VP-P υBI = 0.7VP-P YOUT DC voltage VYO 1.60 2.00 2.40 V — COUT DC voltage VCO 2.20 2.60 3.00 V — VOUT DC voltage VVO 1.35 1.75 2.15 V — ROUT DC voltage VRO 1.25 1.65 2.05 V — GOUT DC voltage VGO 1.25 1.65 2.05 V — BOUT DC voltage VBO 1.25 1.65 2.05 V — Input voltage "L" level SYNC, BFP, NT / PAL VIL — — 0.8 V — Input voltage "H" level SYNC, BFP, NT / PAL VIH 2.2 — — V — Input impedance SYNC, BFP, NT / PAL ZI 8 13.5 — kΩ — R phase G phase COUT B phase VOUT Burst level Carrier leak PAL burst phase PAL burst level ratio SYNCOUT — ∗1 Guaranteed performance. ∗2 Measured 3.5 µs after burst with a 3.58 MHz BPF. ∗3 Measured with a 3.58 MHz BPF. 䊊 Not designed for radiation resistance. 3 Multimedia ICs BA7232FS •Measurement circuit 0.1µ 1 BIN input 20 75Ω CLAMP + 75 BOUT measurement point 220µ 75 BFP 0.1µ 75Ω CLAMP 2 GIN input 19 + 75 GOUT measurement point 220µ 75 BFP 0.1µ + 75Ω CLAMP 3 RIN input 75 ROUT measurement point 18 220µ 75 BFP VCC 4 BURST GEN. MATRIX VCC SYNCOUT measurement point 16 PHASE GEN. 7 F•F 1 8 FILTER SW1 0.1µ Color subcarrier 4.7k SYNC MIX + 75Ω 13 12 GND 0.47µ 10 75Ω 75 YOUT measurement point 220µ 560 75 75 15 + 220µ 9 COUT measurement point 75Ω 75 14 Y/C MIX VCC R - Y MOD. 6 2 2K B - Y MOD. SYNC Burst flag pulse (BFP) 17 SYNC 5 Composite synch 4 VCC VCC GND 11 75 VOUT measurement point 75 Multimedia ICs BA7232FS operation •(1)Circuit SYNCIN is for composite synch input. During low 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 75Ω driver. (6) VOUT is for color TV signal output, and has an internal 75Ω driver. (7) ROUT, GOUT and BOUT are for analog RGB signal output, and have an internal 75Ω driver. The relationship between chroma phase and burst phase during PAL processing is as follows. NT / PAL BFP R-Y Chroma phases burst B-Y B-Y B-Y burst burst R-Y R-Y 5 Multimedia ICs BA7232FS •Application example (NTSC color TV signals) 0.1µ 1 Analog B signal CLAMP 75Ω 20 75Ω 19 75Ω 18 BFP 0.1µ Analog G signal 2 CLAMP 3 CLAMP BFP 0.1µ Analog R signal BFP VCC 4 BURST GEN. MATRIX VCC VCC VCC 17 SYNC Composite synch output 16 8 FILTER 0.1µ SYNC MIX 75Ω 13 560 + 75 Color TV signal output 75Ω 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 8kΩ. 11 •External dimensions (Units: mm) 8.7 ± 0.2 20 11 1 10 0.8 0.36 ± 0.1 0.15 ± 0.1 notes •(1)Operation Input impedance at the input terminals should be as GND 5.4 ± 0.2 10 12 GND 0.11 9 6 15 220µ 7.8 ± 0.3 4.7k 1.8 ± 0.1 Color subcarrier 75Ω 14 Y/C MIX 7 F•F VCC R - Y MOD. 6 B - Y MOD. SYNC Burst flag pulse (BFP) PHASE GEN. 5 Composite synch 0.3Min. 0.15 SSOP - A20