cxa1645p Sony Electronics, cxa1645p Datasheet - Page 13

• Manufacturer Part Number: cxa1645p
• Description: Rgb Encoder
• Manufacturer: Sony Electronics

7. V
8. YTRAP pin (Pin 17)
(1) Install a capacitor of 30 to 68pF between YTRAP and GND. Decide the capacitance by conducting image
(2) Connect a capacitor C and an inductor L in series between YTRAP and GND. When the subcarrier
9. Driving COUT (Pin 15), YOUT (Pin 16), CVOUT (Pin 20), and B.G.R OUT (Pins 21, 22 and 23) outputs
10. This IC employs a number of 75
Do not connect this pin to an external load that might cause AC signals to flow, which will cause IC
malfunctions. When connecting a DC load, make sure that the current flowing from this pin is kept below
2mA.
There are the following two means of reducing cross color generated by subcarrier frequency components
contained in the Y signal.
In Pin Description, "Capable of driving a 75
load shown in the figure below. In other words, the pin is capable of driving a 150 load in AC.
Keep in mind that the pin is incapable of driving a 150 load in DC load in DC direct coupling.
Nos. 4 and 6 are not taken thoroughly. Be very careful of oscillation in printed circuit board design and
carry out thorough investigations in the actual driving condition.
evaluation, etc., giving consideration to both cross color and resolution.
Relations between capacitance and image quality are as follows:
frequency is fo, the values C and L are determined by the equation fo =
image evaluation, etc., giving consideration to both cross color and resolution.
Relations between inductor values and image quality are as follows:
For instance, L = 68µH and C = 28pF are recommended for NTSC. It is necessary to select an inductor L
with a sufficiently small DC resistance. Method (2) is more useful for achieving a higher resoluation than
method (1). When an even higher resolution is necessary, use of the S terminal (YOUT and COUT) is
recommended.
REF
Inductor value
pin (Pin 14)
Capacitance
Cross color
Cross color
Resolution
Resolution
Large
Small
Large
30pF
High
High
driver pins, so oscillation is likely to occur when measures described in
68pF
Large
Small
Small
Low
Low
PIN
load" means that the pin can drive a capacitor +75
75
– 13 –
220µF
17
75
17
C
C
L
2
1
LC
. Decide the values in
CXA1645P/M
+75