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CXA1785AR
RGB Decoder/Driver For the availability of this product, please contact the sales office.
Description The CXA1785AR is an RGB decoder/driver designed to drive LCD panels. This IC converts composite video signals, Y/C signals and Y/color difference signals into RGB signals used for driving LCDs. Features • Both NTSC/PAL compatible • Supports composite inputs, Y/C inputs and Y/color difference input • Band pass filter, trap and delay line • Sharpness function • γ compensation circuit • R, B output delay time adjustment circuit • Polarity reverse circuit Applications • Color liquid crystal viewfinders • Liquid crystal projectors • Industrial monitors Structure Bipolar silicon monolithic IC 48 pin LQFP (Plastic)
Absolute Maximum Ratings (Ta=25°C) • Supply voltage VCC1-GND 6 V • Supply voltage VCC2-VEE 15 V • Supply voltage GND-VEE 10 V • Input pin voltage VIN VCC1 V • Operating temperature Topr –30 to +85 °C • Storage temperature Tstg –55 to +150 °C • Allowable power dissipation PD 560 mW Operating Conditions • Supply voltage VCC1-GND 4.25 to 5.25 V • Supply voltage VCC2-GND 4.25 to 14.0 V • Supply voltage VCC2-VEE 11.25 to 14.0 V • Supply voltage VEE-GND –8.75 to 0 V
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
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E93Z28-TE
CXA1785AR
Block Diagram
SUB CONTRAST B
SUB CONTRAST R
SUB BRIGHT B
BRIGHT
DL ADJ
GAMMA 2
SUB BRIGHT R
27
GAMMA 1
SYNC IN
36 SYNC OUT 37
SYNC SEP
35
34
33
32
31
30
29
28
26
CLIP
FRP
25
VCC2
VREF
24 B OUT
SYNC SEP
38
BGP GEN
B-Y
23
DL γ
BRIGHT
B DC DET
INV
INT / EXT SW
EXT B IN
39
BGP G-Y
22 G OUT
γ
BRIGHT
MATRI X
INV
EXT G IN
40
R-Y
21 G DC DET
DL γ
BRIGHT
EXT R IN
41
Y
INV
20 R OUT
CONTRAST
42
CLAMP
G GEN
DEMOD
N PN P
19
R DC DET
43 Vcc1
AGC AMP
PAL SW
P N
PHASE SHIFT
VEE 18
F ADJ
44
AGC DET
P N PICTURE
P
GND 17
IDENT
N
REG3 REG2
EXT SYNC
F/F
CLAMP
45
16
VXO
VXO OUT
AGC FILTER
46
REG1
COMP Y/C
HPF
COLOR
KILLER
APC HUE
15 APC FILTER
AGC OUT
47
TRAP ACC
ACC DET Y/C PAL ON
14
NT/PAL/ COLOR DEFFER
VXO IN
PICTURE
48
H. FILTER COMP
13 HUE
1
TRAP
2
H FILTER OUT
3
VIDEO IN
4
IDENT FILTER
5
C IN
6
BURST OUT
7
COLOR
8
KILLER FILTER
9
R-Y
10
11
12
B-Y
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ACC FILTER
CHROMA OUT
CXA1785AR
Pin Description Pin No. 1 Symbol TRAP Pin voltage 2.0V
VCC1
(The pin voltage is VCC1 = 4.5 V) Equivalent circuit Description Trap connection. Leave this pin open other than when composite video input is selected.
1
VEE
GND
2
H FILTER OUT
VCC1
Outputs the video signal to be input to the sync separation circuit.
2
VEE
GND
3
VIDEO IN
2.25V
VCC1
3
Composite video signal input (Y signal when using Y/C input and Y/color difference input). The standard input level is 0.5 VP-P (from sync tip to 100 % white).
GND
VEE
4
IDENT FILTER
VCC1
IDENT detection filter connection. Leave this pin open other than when PAL mode is selected.
4
VEE GND
5
C IN
2.5V
VCC1
5
VEE
GND
Chroma signal input when using Y/C input. Composite video signal input is supported when this pin is connected to GND. Leave this pin open when Y/color difference input. The standard input level is 0.15 VP-P (burst).
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CXA1785AR
Pin No. 6
Symbol COLOR
Pin voltage
VCC1
Equivalent circuit
Description Color adjustment. The amplitude of color difference signal is adjusted when Y/color difference input.
6
VEE GND
7
BURST OUT
3.2V
VCC1
7
Burst cleaning coil is connected for PAL. Leave this pin open other than when PAL mode is selected.
VEE GND
8
KILLER FILTER
VCC1
8
Killer detection filter is connected. Leave this pin open other than when Y/color difference input is selected.
GND VEE
9
R–Y
1.9V
VCC1
9
10
B–Y
1.9V
10
VEE GND
Color difference demodulation circuit inputs. Leave this pin open for NTSC. Color difference signal is input when Y/color difference input. In this case, input is pedestal clamped by using external coupling capacitor. ACC detection filter is connected. Leave this pin open for Y/color difference input.
11
ACC FILTER
VCC1
11 VEE
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CXA1785AR
Pin No. 12
Symbol CHROMA OUT
Pin voltage 2.3V
VCC1
Equivalent circuit
Description Color adjusted and burst taken out chroma signal is output.
12
VEE
GND
13
HUE
VCC1
13
VEE GND
14
VXO IN
3.9V
VCC1
Color phase adjustment pin. Also doubles as the NTSC, PAL or Y/color difference switch. PAL is selected when this pin is connected to GND; Y/color difference is selected when this pin is connected to Vcc1. VXO input. Leave this pin open for Y/color difference input.
14 GND VEE
15
APC FILTER
VCC1
APC detection filter connection. Leave this pin open for Y/color difference input.
15
VEE.