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PDF CXA1645P Data sheet ( Hoja de datos )
| Número de pieza | CXA1645P | |
| Descripción | RGB Encoder | |
| Fabricantes | Sony Corporation | |
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CXA1645P/M
RGB Encoder
For the availability of this product, please contact the sales office.
Description
The CXA1645P/M is an encoder IC that converts
analog RGB signals to a composite video signal. This
IC has various pulse generators necessary for
encoding. Composite video outputs and Y/C outputs for
the S terminal are obtained just by inputting composite
sync, subcarrier and analog RGB signals.
It is best suited to image processing of personal
computers and video games.
24 pin DIP (Plastic)
24 pin SOP (Plastic)
Features
• Single 5V power supply
• Compatible with both NTSC and PAL systems
• Built-in 75Ω drivers
(RGB output, composite video output, Y output, C
output)
• Both sine wave and pulse can be input as a
subcarrier.
• Built-in band pass filter for the C signal and delay
line for the Y signal
• Built-in R-Y and B-Y modulator circuits
• Built-in PAL alternate circuit
• Burst flag generator circuit
• Half H killer circuit
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings
• Supply voltage VCC 14
V
• Operating temperature Topr –20 to +75
°C
• Storage temperature Tstg –65 to +150 °C
• Allowable power
PD CXA1645P 1250 mW
dissipation
CXA1645M 780 mW
Recommended Operating Condition
Supply voltage
VCC1, 2 5.0 ± 0.25
V
Applications
Image processing of video games and personal
computers
Block Diagram and Pin Configuration
GND2
24
ROUT
23
GOUT
22
BOUT
21
CVOUT
20
VCC2
19
FO
YTRAP
YOUT
COUT
VREF
18 17 16 15 14
IREF
13
R-OUT
G-OUT
B-OUT
VIDEO
OUT
Y/C
MIX
DELAY CLAMP
75 75
DRIVER DRIVER
REGULATOR
SYNC
ADD
R-Y
Modulator
BPF
CLAMP CLAMP CLAMP
SIN-PULSE
B-Y
Modulator
PHASE
SHIFTER
PULSE
GEN
1 2 3 4 5 6 7 8 9 10 11 12
GND1
RIN
GIN
BIN
NC
SCIN
NPIN
BFOUT YCLPC SYNCIN
NC
VCC1
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.
–1–
E93411A41-ST
1 page  
CXA1645P/M
Pin
No.
Symbol Pin voltage
19 VCC2
5.0V∗
Equivalent circuit
Description
Power supply for RGB, composite video and
Y/C output circuits. Decouple this pin with a
large capacitor of 10µF or above as a high
current flows.
Refer to Notes on Operation, Nos. 4 and 10.
20
CVOUT
Black level
1.2V
20
VCC2
VCC1
600µ
20k
Composite video signal output. Capable of
driving a 75Ω load.
Refer to Notes on Operation, Nos. 6 and 9.
GND2
500µ
21 BOUT
22 GOUT
23 ROUT
Black level
1.7V
21
22
23
5.5k
24 GND2
0V∗
VCC2
VCC1
200µ
GND1
GND2
Analog RGB signal outputs. Capable of
driving a 75Ω load.
Refer to Notes on Operation, Nos. 6 and 9.
Ground for RGB, composite video and Y/C
output circuits. The leads to GND1 should
be as short and wide as possible.
–5–
5 Page 
CXA1645P/M
Description of Operation
Analog RGB signals input from Pins 2, 3 and 4 are clamped in the clamping circuit and output from Pins 23,
22 and 21, respectively.
The matrix circuit performs operations on each input signal, generating luminance signal Y and color
difference signals R-Y and B-Y. The Y signal enters the delay line to adjust delay time with the color signal C.
Then, after addition of the CSYNC signal input from Pin 10, the Y signal is output from Pin 16.
A subcarrier input from Pin 6 is input to the phase shifter, where its phase is sfited 90°. Then, the subcarrier
is input to the modulators and modulated by the R-Y signal and the B-Y signal. Modulated subcarriers are
mixed, sent to the band pass filter to eliminate higher harmonic components and finally output from Pin 15 as
the C signal. At the same time, Y and C signals are mixed and output from Pin 20 as the composite video
signal.
Burst Signal
The CXA1645P/M generates burst signals at the timing shown below according to the composite sync signal
input.
H synchronization
SYNC
IN
(TTL level)
C VIDEO
OUT
COUT
V synchronization
SYNC
IN
ODD
EVEN
tD (B) tW (B)
Burst signal
tD (B) tW (B)
C VIDEO
OUT
ODD
EVEN
Synchronizing signal
Burst signal
– 11 –
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CXA1645P.PDF ] | |
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