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PDF BA7230 Data sheet ( Hoja de datos )
| Número de pieza | BA7230 | |
| Descripción | NTSC color TV signal encoder | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de BA7230 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Multimedia ICs
NTSC color TV signal encoder
BA7230LS
The BA7230LS comprises an RGB signal matrix circuit, balanced modulator circuit (rectangular 2-phase modula-
tion), oscillator circuit (VCXO) for a 3.58MHz subcarrier synchronized with video input burst signals, luminosity and
color difference signal mixing circuit, and a high speed switch for selecting composite signals of video input and RGB
input. RGB signals, synch signals, BFP (burst flag pulses), PCP (pedestal clamp pulses) are input, and an NTSC
composite signal is output.
•Applications
Televisions (Teletext-capable), captain systems, video cameras, personal computers
•Features
1) Allows superimposition of video images (VIDEO IN)
and computer images (RGB IN).
2) During superimposition, the subcarrier locked onto
the video input burst signal RGB is modulated with
the RGB signals by the APC circuit, preventing
unnatural color disturbance due to switching.
3) Both the RGB and video input signals are pedestal-
clamped, maintaining a natural image even during
fluctuation in luminosity.
4) Using a half down pulse, the video signal can be
reduced by 5dB to darken the background and
make the superimposed RGB image easier to see.
5) Carrier leak is suppressible to less than 70mVP-P
(VOUT = 2VP-P) without adjustment.
6) Can be adapted for analog RGB input.
7) Compact 24-pin SZIP package minimizes external
components.
•Block diagram
VIDEO OUT 1
Y IN 3
R-Y IN 5
VC 7
VA 9
APC PHASE
ADJUSTMENT
11
AR 13
AB 15
B-Y OUT 17
GND 19
PCP IN 21
YSP IN 23
BA7230LS
+
+
MOD
MOD
VCXO
PD
2 SYNC IN
4 B-Y IN
BURST LEVEL
6 ADJUSTMENT
8 VB
10 BFP IN
12 PD
14 AG
MATRIX
16 Y OUT
B-Y
R-Y
18 R-Y OUT
HD 20 VIDEO IN
22 HDP IN
VCC
24 VCC
1
1 page  
Multimedia ICs
BA7230LS
•Application example
LPF
1.2mH L2 R17 1kΩ
1.2 mH L1 R16 1kΩ
Q1
2SC2021
VCC
18
2SC2021
Q2
3kΩ
VCC
17
+VR2 1µF
C11 4
+300Ω
C10
5
1µF
VR3
3kΩ
300Ω
Burst
LEVEL
ADJ
VR4
6
5kΩ
PCP
21
+VIDEOIN 1µF 20
BFP
C9
R15 10
1kΩ
DL1, DL2: X503 (SUMIDA)
L1, L2: RC-875 1.2mH (SUMIDA)
TC1: TZ03R200E (MURATA)
Q1, Q2, Q3: 2SC2021 (ROHM)
XTAL1: HC – 43U 3579.545kHz (NIKKO DENSHI)
RG
B
R1 R2
R3
C17
0.047µF
C16
+ 10µF
C1
1µF
+
13
+
14
+
15
SYNC
2
VCC (5V)
24
CLAMP
19 GND
6dB
YOUT 16
MATRIX
Y
R4 1kΩ
ER - EY
EB - EY
DLY DL1
(400ns)
BA7230LS
MOD
MOD
R-Y + B-Y
+Y
TRP
(3.58M)
RGB
1kΩ R5 Video
YS
1µF +
C4 R6 1kΩ
DLY DL2
YIN 3
23
R7
1kΩ
– 5dB
BG
BG
HDP
0dB
22
– 5dB R14
560Ω
68pF
C8
VCC
6dB
PD
VCXO
9 87
TC1
R13
COMPOSITE
1.2kΩ OUT
82pF R6
X'TAL1 C7 (2VP-P)
C19
10pF
11 VR1
12
APS
PHASE
ADJ
R12
2.7k
+C61µ
C15
0.047µF
0.047µF
C5
VCC
R11
75Ω
820Ω
R10
OUT
Q3 2SC2021
Fig. 3
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BA7230.PDF ] | |
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