NJM2247BM NJR, NJM2247BM Datasheet - Page 10

• Manufacturer Part Number: NJM2247BM
• Description: IC VIDEO COLOR SUPRIMPOSER 20DMP
• Manufacturer: NJR
• Type: Signal Superimposerr

Specifications of NJM2247BM

• Applications: Video Players
• Mounting Type: Surface Mount
• Package / Case: 20-DMP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

■ APPLICATION NOTES
1. Input Signal
2. Clamp Pulse
R – Y, B - Y) is to be fixed at the bias point within the IC.
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During the interval of blanking, input the pulse through clamp pulse pin 20 the blanking level (0 level) of input signal (Y,
Superimposed color level shall be determined by the following standard signal level.
superimposed color level.
The basic expression
Note) The pulse width of clamp pulse shall be set more than A version 6µs and B version 3µs. (see figure 2)
I / O Explanation
• Control Pin Low = 0V, HIGH = 5V
• Adjusting Pin (Normally open → non adjustment)
• The character output level converting expression
(In order to avoide the clipping of the encoding signal, the character output level is determined to lower level)
BF level
Inversion set up correction
The character output standard level on the specification shall be determined through calculation out of 75 % of
R
G
Clamp Pulse
Character Pulse
HBF Pulse
BLK Pulse
C Inversion
Y Inversion
NTS / PAL Switch
B
E
E
R – Y
B – Y
R
B
5
3
4
– E
– E
Y
V
V
signals are as in the following.
E
R – Y
B – Y
Y
Y
V
(E
Y
From standard level and practical input level, each color signal level imposed in R – Y, B – Y and Y
= 0.30 E
= 0.70 E
= – 0.30 E
Y
R
=0.158 E
=0.375 E
= - 0.088 E
, E
= 0.75 × 0.7 [V
= 0.75 × 1 [V
Superimposed color adjustment
19
10
G
, E
R
B
R
0.7V
1.0V
16
15
20
0.7V
, LOW 0, HIGH 1)
12
+ 0.59 E
= 0.59 E
R
R
R
– 0.59 E
+ 0.310 E
- 0.316 E
R
P – P
P – P
P – P
– 0.174 E
P - P
P - P
] × E
G
G
Color difference, brightness inverting pin
+ 0.11 E
] × E
- 0.11E
G
Y, R – Y, B – Y signal process pulse input
18 Y inversion signal level adjusting pin.
13 Burst flag insert level adjusting pin.
G
+ 0.89 E
G
R – Y
- 0.059 E
+ 0.058 E
G
B – Y
+ 0.263 E
/ 1.4
B
B
/ 1.78
Fig. 2 Clamp Pulse Width
B
B
B
B
Ver.2004-02-17