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BA7149 Datenblatt(PDF) 5 Page - Rohm

Teilenummer BA7149
Bauteilbeschribung  Electronic viewfinder driver
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Hersteller  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BA7149 Datenblatt(HTML) 5 Page - Rohm

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5
Video ICs
BA7149F
16pin
2pin
16pin
500
20k
12pin
20k
Fig.11
15pin
12pin
10k
15pin
2k
2k
2.8V
10k
10k
12k
V
+
Fig.10
Circuit operation
Input signals
63.556
µ
H Pulse only
0.29V at 11pin
adj.at 11pin
4.7
µ
262.5H
16.683m
V Pulse only
H Pulse only
Pulse IH
Pulse IS
Pulse IV
IH
Fig.12
The video signal input to pin 11 is detected by the charg-
ing and discharging of an external capacitor. Sync sepa-
ration 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 sup-
plied 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 hor-
izontal 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.


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