Video ICs Electronic viewfinder driver BA7149F The BA7149F is an electronic viewfinder driver for video cameras. It separates the synchronous signal from the input video signal, and outputs the vertical deflection drive output and horizontal deflection signals. HD and VD output signals with guaranteed phase difference are also provided for on-screen displays (OSD). The differences between the BA7149F and the BA7148F are the horizontal blanking, horizontal AFC output, HD output phase and pulse width. Applications •Video cameras •1)Features Operates off a 5V power supply. 5) Few attached components required. 6) SOP 16pin package. 7) Compatible with 10µ sec flyback pulses. 2) Built-in vertical deflection circuit. 3) Built-in wide-bandwidth amplifier. 4) Built-in HD and VD output terminals. •Absolute maximum ratings (Ta = 25°C) Parameter Applied voltage Symbol Limits Unit VCC Max. 8.0 V mW Pd 500∗ Operating temperature Topr – 20 ~ + 75 °C Storage temperature Tstg – 55 ~ + 125 °C Power dissipation ∗ Reduced by 5mW for each increase in Ta of 1°C over 25°C. •Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Symbol Min. Typ. Max. Unit VCC 4.5 5.0 5.5 V 1 Video ICs BA7149F •Block diagram 16 15 H.OSC 14 13 PHASE COMP 12 11 10 9 SYNC SEPA 6dB AMP V.SEPA H.BLK V.BLK V.DRIVE 1 2 3 V.OSC 4 5 6 7 8 •Pin descriptions Pin No. 2 Function Pin No. Function 1 Vertical control input 9 HD output 2 Power supply 1 10 GND 2 3 Vertical deflection drive (POS) 11 Video input 4 GND 1 12 Power supply 2 5 Vertical deflection drive (NEG) 13 Video output 6 Vertical oscillator external resistor 14 Phase comparator output 7 Vertical oscillator external capacitor 15 Horizontal oscillator external resistor 8 VD output 16 Horizontal AFC output Video ICs BA7149F •Electrical characteristics (unless otherwise noted, Ta = 25°C and Vcc = 5.0V) Parameter Operating current dissipation Symbol Min. Typ. Max. Unit ICC 31.0 42.0 55.0 mA 〈VIDEO AMP〉 Voltage gain GV 5.3 6.0 6.7 dB D range DRV 3.20 3.50 — VP-P fC – 2.0 0.0 + 2.0 Vsyn · Min. — 45 120 mVP-P Horizontal blanking width TH · BL 9.6 10.7 11.4 µs Vertical blanking width TV · BL 870 970 1070 µs 15.7 17.5 kHz — kHz Frequency characteristic Minimum sync separation voltage dB 〈Horizontal〉 Free-running frequency fH · O Capture range ∆f CAP 13.9 ± 2.1 ± 3.0 µs AFC output pulse width THP AFC lock-in phase THPH – 1.9 – 1.2 – 0.5 µs Pulse voltage low VHPL 0.5 1.1 1.7 V 10.2 11.1 12.0 〈Vertical〉 fV · O 51.3 54.8 58.2 Hz Pin 3 maximum output amplitude VVP · Max. 2.10 2.70 — VP-P Pin 5 maximum output amplitude VVN · Max. 2.10 2.70 — VP-P Phase difference THVD 17.3 21.3 25.3 µs HD pulse width THD 8.7 9.9 11.1 µs V pulse width TVD 860 960 1060 µs Free-running frequency 〈HD · VD〉 Pulse voltage low VHV · L — 0.1 0.3 V Pulse voltage high VHV · H 4.7 4.9 — V 䊊Not designed for radiation resistance. 3 Video ICs BA7149F •Input / output circuits 2, 3, 4, 5pin 1pin 6pin 2pin 12pin 10k + V 2.33V 500 500 12pin 300 3pin 5pin 1.9k 2k V + 2k 12k 1.5V 300 6pin 1pin 4pin Fig.2 Fig.1 Fig.3 8pin 7pin 9pin 5k 2pin 2pin 12pin 5k 5k 20k 12pin 10k 8µA 20k 7pin 10k 8pin 20k 20k Fig.5 Fig.4 Fig.6 14pin 11pin 13pin 12pin 3k 9pin 25k 20k 11pin 50 12pin 12pin 100 3k 3k 3k 3k 13pin 14pin 1mA 1k 100 V + 1.87V 1.25k 36µA 3k 100 Fig.7 4 Fig.8 3k 3k 3k 100 Fig.9 Video ICs BA7149F 16pin 15pin 2pin 12pin 12pin 20k 20k 10k 10k 10k 500 16pin 12k V + 2k 2k 15pin 2.8V Fig.11 Fig.10 operation •Circuit Input signals IH 63.556µ Pulse IH H Pulse only 0.29V at 11pin H Pulse only Pulse IS adj.at 11pin 4.7µ 262.5H Pulse IV 16.683m V Pulse only Fig.12 The video signal input to pin 11 is detected by the charging and discharging of an external capacitor. Sync separation is done in the SYNC SEPA block. The H. SYNC signal is sent to the H. OSC, and the V. SYNC signal is sync-separated in the vertical sync pulse interval and supplied to the V. OSC block. The H. OSC block consists of a PLL that oscillates in sync with the sync-separated H. SYNC signal, and outputs the HD pulse and horizontal deflection pulse. In the V. OSC block, a direct-control method is used with the sync signal. To synchronize the vertical oscillator cir- cuit, the inherent oscillation period of the oscillation circuit is made slightly larger than the vertical sync signal period, so that the sync signal always enters slightly early. The oscillator output alone is not enough to ensure stable operation for the vertical deflection output circuit, so it is amplified by the V. DRIVE block. The horizontal and vertical blanking signals generated in the H. OSC and V. OSC blocks are used to erase the horizontal retrace line from the video signal input to pin 11. The signal is inverted and amplified by a 6dB inverting amplifier and output as a negative-polarity video signal. 5 Video ICs BA7149F •Application example VIDEO OUT VCC VCC VIDEO IN FBT 100µ 15k 470 + 1µ 100k 10k 1µ + 470 47µ 0.022µ 1500pF + 0.22µ 510k + 390k 16 15 H.OSC 14 13 PHASE COMP 12 HD 11 10 9 SYNC SEPA 6dB AMP V.SEPA H.BLK V.BLK V.DRIVE VCC 1 2 V.OSC 3 4 5 6 7 15k + 0.022µ 5mH + 36Ω 8 0.1µ VD 47µ VR1 100 3.9 Fig.13 ∗1 The resistors connected to pins 6 and 15 should have a tolerance of ± 2%, and a temperature coefficient of ± 100ppm or lower. ∗2 The capacitor connected to pin7 should have a tolerance of ± 5%, and a temperature coefficient of ± 250ppm or lower. 6 Video ICs BA7149F notes •(1)Operation H.OSC free-run frequency and capture range The free-run frequency is determined by the 115kΩ resistor connected between pin 15 and GND. The capture range is varied by the resistors and capacitor connected to pins 14 and 15. The free-run frequency and capture range for this IC are guaranteed for these circuit constant values, and we recommend that you use them. The resistor 115kΩ connected between pin15 and GND should have a tolerance of ± 2%, and a temperature coefficient of ± 100ppm or lower. (2) V.OSC free-run frequency The V.OSC free-run frequency is determined by the 15kΩ resistor connected between pin 6 and GND, and the 0.1µF capacitor connected between pin 7 and GND. The free-run frequency and capture range for this IC are guaranteed for these circuit constant values, and we recommend that you use them. The resistor 15kΩ connected between pin 6 and GND should have a tolerance of ± 2%, and a temperature coefficient of ± 100ppm or lower, and the capacitor connected between pin 7 and GND should have a tolerance of ± 5%, and a temperature coefficient of ± 250ppm or lower. (3) Use with PAL systems In PAL systems, change the value of the resistor connected between pin 6 and GND to 18kΩ. (4) PCB pattern The large-signal systems and small-signal systems in the IC have been kept separate, and the external wring must also be done in such a way to prevent interference from occurring. In particular, to prevent the FBT return current from interfering with the V. OSC circuit on pins 6 and 7, do not directly connect the pin 4 GND and pin 6 and 7 GND. G FBT ∗ Do not connect pin 4 GND to pin 6 and 7 GND. VCC 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 Fig.14 •External dimensions (Units: mm) 16 9 1 8 1.27 0.4 ± 0.1 0.15 ± 0.1 4.4 ± 0.2 0.11 1.5 ± 0.1 6.2 ± 0.3 10.0 ± 0.2 0.3Min. 0.15 SOP16 7