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PDF TDA4780 Data sheet ( Hoja de datos )
| Número de pieza | TDA4780 | |
| Descripción | RGB video processor with automatic cut-off control and gamma adjust | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
TDA4780
RGB video processor with
automatic cut-off control and
gamma adjust
Preliminary specification
Supersedes data of May 1994
File under Integrated Circuits, IC02
1997 Feb 06
1 page  
Philips Semiconductors
RGB video processor with automatic
cut-off control and gamma adjust
Preliminary specification
TDA4780
handbook, full pagewidth average beam
current limiting
input
BCL
15
AVERAGE
BEAM
CURRENT
LIMITING
peak drive
limiting storage
1 µF
CPDL
16
PEAK DRIVE
LIMITER
ABSOLUTE LEVEL
RELC
MINIMUM
DETECTOR
PEAK DRIVE
LIMITER
CUT-OFF RELATED
TDA4780
VOLTAGE
COMPARATOR
VOLTAGE
COMPARATOR
TCPL RELC
a
WHITE
POINT
ADJUST
R
OUTPUT
BUFFER
b RR
c
CONTRAST G
BRIGHTNESS G
ADJUST
ADJUST
BB
d
MOD2
B BLUE B
STRETCH
e
f
MP
BLANK
WHITE
POINT
ADJUST
G
MP
BLANK
WHITE
POINT
ADJUST
B
OUTPUT
BUFFER
OUTPUT
BUFFER
g
CL
h
i HV
(H)
j
REGISTERS
DIGITAL ANALOG CONVERTERS
NMEN BLANK
FSBL HDTV
MP
MP
BLANK
BCOF
CUT-OFF
CONTROL
UGAP BCOF
OUTPUT
CLAMP
TIMING
GENERATOR
1st AND 2nd
SWITCH-ON
DELAY
LEAKAGE
CURRENT
COMPARATOR
17 UGAP
CL
330 nF
leakage storage
21
CB
220 nF
23
CG
220 nF
25
CR
220 nF
cut-off storage
24 RO
22 GO
RGB
outputs
to
video
amplifiers
20 BO
19 CI
leakage and
cut - off
current input
82 kΩ
MGE876
1997 Feb 06
Fig.2 Block diagram (continued from Fig.1).
5
5 Page 
Philips Semiconductors
RGB video processor with automatic
cut-off control and gamma adjust
Preliminary specification
TDA4780
Table 4 Signal input selection and effect on adaptive black measurements by fast source switches and I2C-bus;
note 1
I2C-BUS CONTROLLED BITS
ANALOG SWITCH
SELECTED SIGNALS
FSON2 FSDIS2 FSON1 FSDIS1
FSW2
(pin 1)
FSW1
(pin 13)
RGB2
(pins 2, 3
and 4)
ADBL
RGB1 (pins 10,
11 and 12)
TV (pins 6,
7 and 8)
LLLLL
L
active
LH
active ON
H X ON inactive
L L L HL
X
active
H X ON inactive
L L HXL
X
active ON
H X ON inactive
L HL L X
L
active
XH
active ON
L HL HX
X
active
L HHXX
X
active ON
H L X X L X ON active
H ON inactive
H H X X X X ON active
ON
ON
ON
ON
Note
1. Explanation for the cell contents of the table:
a) H = set to logic 1 or analog switch (pins 1 and 13) to >0.9 V.
b) L = set to logic 0 or analog switch (pins 1 and 13) to <0.4 V.
c) X = don’t care.
d) ON = this signal is selected.
1997 Feb 06
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TDA4780.PDF ] | |
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