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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 *Features off a 5V power supply. 1) Operates
2) Built-in vertical deflection circuit. 3) Built-in wide-bandwidth amplifier. 4) Built-in HD and VD output terminals. 5) Few attached components required. 6) SOP 16pin package. 7) Compatible with 10 sec flyback pulses.
*Absolute maximum ratings (Ta = 25C)
Parameter Applied voltage Power dissipation Operating temperature Storage temperature Symbol VCC Max. Pd Topr Tstg Limits 8.0 500 - 20 ~ + 75 - 55 ~ + 125 Unit V mW C C
Reduced by 5mW for each increase in Ta of 1C over 25C.
*Recommended operating conditions (Ta = 25C)
Parameter Power supply voltage Symbol VCC Min. 4.5 Typ. 5.0 Max. 5.5 Unit V
1
Video ICs
BA7149F
*Block diagram
16 15 14 13 12 11 10 9
H.OSC
PHASE COMP
6dB AMP
SYNC SEPA V.SEPA
H.BLK V.BLK
V.DRIVE
V.OSC
1
2
3
4
5
6
7
8
*Pin descriptions
Pin No. 1 2 3 4 5 6 7 8 Function Vertical control input Power supply 1 Vertical deflection drive (POS) GND 1 Vertical deflection drive (NEG) Vertical oscillator external resistor Vertical oscillator external capacitor VD output Pin No. 9 10 11 12 13 14 15 16 HD output GND 2 Video input Power supply 2 Video output Phase comparator output Horizontal oscillator external resistor Horizontal AFC output Function
2
Video ICs
BA7149F
*Electrical characteristics (unless otherwise noted, Ta = 25C and Vcc = 5.0V)
Parameter Operating current dissipation Symbol ICC Min. 31.0 Typ. 42.0 Max. 55.0 Unit mA
VIDEO AMP
Voltage gain D range Frequency characteristic Minimum sync separation voltage Horizontal blanking width Vertical blanking width GV DRV fC Vsyn * Min. TH * BL TV * BL 5.3 3.20 - 2.0 -- 9.6 870 6.0 3.50 0.0 45 10.7 970 6.7 -- + 2.0 120 11.4 1070 dB VP-P dB mVP-P s s
Horizontal
Free-running frequency Capture range AFC output pulse width AFC lock-in phase Pulse voltage low fH * O f CAP THP THPH VHPL 13.9 2.1 10.2 - 1.9 0.5 15.7 3.0 11.1 - 1.2 1.1 17.5 -- 12.0 - 0.5 1.7 kHz kHz s s V
Vertical
Free-running frequency Pin 3 maximum output amplitude Pin 5 maximum output amplitude fV * O VVP * Max. VVN * Max. 51.3 2.10 2.10 54.8 2.70 2.70 58.2 -- -- Hz VP-P VP-P s s s V V
HD * VD
Phase difference HD pulse width V pulse width Pulse voltage low Pulse voltage high
Not designed for radiation resistance.
THVD THD TVD VHV * L VHV * H
17.3 8.7 860 -- 4.7
21.3 9.9 960 0.1 4.9
25.3 11.1 1060 0.3 --
3
Video ICs
BA7149F
*Input / output circuits
1pin
12pin
2, 3, 4, 5pin
2pin
6pin
12pin
10k
V
+ 2.33V 300 3pin 5pin 2k
V +
500
500 1.9k
2k
1.5V 300 1pin 4pin
12k 6pin
Fig.1
Fig.2
Fig.3
7pin
12pin 5k 5k 5k
8pin
2pin 20k 12pin 8A 7pin 10k 20k 8pin
9pin
2pin 10k 20k 25k
9pin
20k
20k
Fig.4
Fig.5
Fig.6
13pin
12pin 3k 100
11pin
11pin 50 12pin
14pin
12pin 3k 3k 3k 3k
13pin 1mA 100
V
14pin 1k + 1.87V 36A 1.25k 3k 3k 3k 3k
100
100
Fig.7
Fig.8
Fig.9
4
Video ICs
BA7149F
15pin
12pin
16pin
2pin 12pin 20k 20k 500 16pin
10k 10k 10k 12k
V
+
2k
2k 15pin
2.8V
Fig.10
Fig.11
operation *Circuitsignals Input
Pulse IH IH 63.556 H Pulse only
0.29V at 11pin
H Pulse only Pulse IS adj.at 11pin
4.7
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
VCC
VIDEO OUT VCC VIDEO IN
FBT 15k 1500pF 100k + 1 390k
16 15 14 13
100 + 1 0.022 47 470 470
HD
10k
+
+
12 11
0.22 510k
10 9
H.OSC
PHASE COMP
6dB AMP
SYNC SEPA V.SEPA
H.BLK V.BLK
V.DRIVE
V.OSC
VCC
1
2
3
4
5
6
7
8
15k + 0.022 47 VR1 100 3.9 5mH + 36
0.1 VD
Fig.13
1 The resistors connected to pins 6 and 15 should have a tolerance of 2%, and a temperature 2 The capacitor connected to pin7 should have a tolerance of 5%, and a temperature coefficient of
250ppm or lower. coefficient of 100ppm or lower.
6
Video ICs
notes *Operationfree-run frequency and capture range (1) H.OSC The free-run frequency is determined by the 115k 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 115k 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 15k resistor connected between pin 6 and GND, and the 0.1F 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 15k 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.
BA7149F
(3) Use with PAL systems In PAL systems, change the value of the resistor connected between pin 6 and GND to 18k. (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
VCC
1
16 15 14 13 12 11 10 9
FBT
2 3
Do not connect pin 4 GND
to pin 6 and 7 GND.
4 5 6 7 8
Fig.14
*External dimensions (Units: mm)
10.0 0.2 16 6.2 0.3 4.4 0.2 9
1 1.5 0.1
8
0.11
1.27
0.4 0.1
0.3Min. 0.15
SOP16
0.15 0.1
7

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