NJM2256
VIDEO COLOR SUPERIMPOSER
■ GENERAL DESCRIPTION
NJM2256 is the multi-functional color super-imposer IC for videobase
band (Y, R-Y, B-Y), Various type of Y, R-Y, B-Y output signals can bemade
by the digital controlled signals.
The signal control at the base band, made it possible on operation with
less extermal parts, as well as for non adjustment on operation.
NJM2256 can be operated much higher switching speed comparing to
NJM2247.
■ PACKAGE OUTLINE
NJM2256M
■ FEATURES
● 5V single Power Supply
● 8 Types Color Super-imposer
● Burst Flag Insert Function
● Y Inversion, C Inversion Function
● NTSC / PAL Matching
● Non Operational Adjustment
● Less External Parts
● Higher switching speed can be made comparing to NJM2247
● Package Outline DMP20
● Bipolar Technology
■ RECOMMENDED INPUT CONDITIONS
● Y Signal
0.7VP - P
● R-Y Signal
1.0VP - P
● B-Y Signal
0.7VP - P
● Control Voltage
● Low Level
0 to 0.25V
● High Level
4.75 to 5V
■ PIN CONFIGURATION
NJM2256M
Ver.2004-02-17
-1-
NJM2256
■ CONTROL PIN CHARACTERISTICS
PIN NO.
PIN FUNCTIONS
3
4
5
3
4
5
10
12
14
15
16
19
20
(V+=5V)
THRESHOLD LEVEL (V)
SINK / SOURCE CURRENT (µA)
LOW
HIGH
0V
5V
R
G
B
0.7
0.8
-500
500
(at C Inversion)
2.5
2.6
-100
100
C Inversion
HBF Pulse
NTSC / PAL
Clamp Pulse
Character Pulse
Y Inversion
BLK Pulse
3.5
0.5
0.7
2.5
0.5
0.4
0.4
4.5
2.0
0.8
2.8
0.9
0.8
0.8
-200
-2
0
-2
-0.5
-0.5
-0.5
400
1
150
0
0
0
0
■ BLOCK DIAGRAM
-2-
Ver.2004-02-17
NJM2256
■ INFORMATIONS
Following four points are the outstanding function of the NJM2256. These functions are to go through three input (Y,
R-Y, B-Y) signals control by ten control pins.
1. Color Superimpose
DC Level of each equivalent colors shall be supplied to Y, R-Y and B-Y inputs.
2. Burst Flag Insertion
150 mV burst flag shall be added to R-Y, B-Y input signals.
Burst flag is selected by the NTSC / PAL switch.
3. C Inversion
The color phase of the picture shall be inverted for one hundred and eighty degrees. The color phase of the imposed
character shall not be altered. This function shall be proceeded when inverting the burst flag, and at the same time, the
imposed character level shall be inverted too.
4. Y Inversion
It is the brightness level inversion. The imposed character color shall not be changed. This function shall be
proceeded the switching Y signal output to the inverter side.
NJM2256
Fig.1 Video Camera Application
Ver.2004-02-17
-3-
NJM2256
■ EQUIVALENT CIRCUIT
PIN NO.
PIN
FUNCTION
6
B-Yin
7
B-Yout
G
8
R-Yin
B
9
R-Yout
PIN NO.
PIN
FUNCTION
1
Yout
2
V+
3
R
4
5
-4-
INSIDE EQUIVALENT CIRCUIT
INSIDE EQUIVALENT CIRCUIT
Ver.2004-02-17
NJM2256
■ EQUIVALENT CIRCUIT
PIN
FUNCTION
PIN NO.
10
13
14
PIN NO.
PIN
FUNCTION
15
Clamp
Pulse
16
Character
Pulse
INSIDE EQUIVALENT CIRCUIT
C
Inversion
11
12
INSIDE EQUIVALENT CIRCUIT
GND
HBF
Pulse
BF
Level
NTSC / PAL
Ver.2004-02-17
17
Yin
18
Inversion
Set up
Correction
19
20
Y
Inversion
BLK
-5-
NJM2256
■ ABSOLUTE MAXIMUM RATINGS
PARAMETER
(Ta=25°C)
SYMBOL
RATINGS
UNIT
+
Supply Voltage
V
8
V
Power Dissipation
PD
350
mW
Operating Temperature Range
Topr
-20 to +75
Storage Temperature Range
Tstg
-40 to +125
°C
°C
■ ELECTRICAL CHARACTERISTICS
PARAMETER
CONTROL PIN
SYMBOL
3
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
12
18.5
26
mA
4 5 10 12 14 15 16 19 20
Operating Current
Icc
(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)
Terminal Sink Current 1
I17
(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)
V 17 = 2.5V Current when
application
0
10
µA
Terminal Sink Current 1
I6
(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)
V 6 = 3.0V Current when
application
0
6
µA
Terminal Sink Current 3
I8
(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)
V 8 = 3.0V Current when
application
0
6
µA
Terminal Voltage 1
Terminal Voltage 2
Terminal Voltage 3
Terminal Voltage 4
Terminal Voltage 5
Y Non Inversion
Voltage Gain
Frequency
V1
V7
V9
V13
V18
(0)(0)(0)(0)(0)(5)(0)(0)(0)(0)
(0)(0)(0)(0)(0)(5)(0)(0)(0)(0)
(0)(0)(0)(0)(0)(5)(0)(0)(0)(0)
(0)(0)(0)(0)(0)(5)(0)(0)(0)(0)
(0)(0)(0)(0)(0)(5)(0)(0)(0)(0)
1
7
9
13
18
1.68
2.18
2.18
0.23
1.68
1.92
2.42
2.42
0.37
1.92
V
V
V
V
V
GYP
DGP
(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)
(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)
V (YIN) = 1VP-P, 1MHz
GYP (6MHz) – GYP (1MHz)
-0.5
-1
0
0
0.5
1
dB
dB
Differential Gain
DPP
(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)
V (YIN) = 1VP - P, Standard
Staircase
-3
0
3
%
Differential Phase
Y Inversion
Voltage Gain
Frequency
DPP
-3
0
3
deg
GYN
GFYN
(0)(0)(0)(0)(0)(0)(0)(0)(0)(0)
(
)
(0)(0)(0)(0)(0)(0)(0)(0)(5)(5)
(0)(0)(0)(0)(0)(0)(0)(0)(5)(5)
-2.3
-2
-1.3
-0.1
0.3
1
dB
dB
Differential Gain
DGN
(0)(0)(0)(0)(0)(0)(0)(0)(5)(5)
Differential Phase
DPP
(0)(0)(0)(0)(0)(0)(0)(0)(5)(5)
Inversion Block Level
BLN
(0)(0)(0)(0)(0)(0)(5)(0)(5)(5)
(0)(0)(0)(0)(0)(0)(5)(0)(5)(5)
1 Voltage: a
1 Voltage: b
(0)(0)(0)(0)(0)(0)(5)(0)(5)(0)
1 Voltage: c
GR-Y
(0)(0)(0)(0)(0)(0)(5)(0)(0)(0)
V (R-YIN) = 1VP - P, 1MHz
-0.5
BFRP
(0)(0)(0)(0)(0)(0)(5)(0)(0)(0)
(0)(0)(0)(5)(5)(0)(5)(0)(0)(0)
9 Voltage: d
9 Voltage: e
BFRP = e - d
135
BFRN
(0)(0)(0)(5)(5)(0)(5)(0)(0)(0)
9 Voltage: f
BFRN = f - d
GR-Y
(0)(0)(0)(0)(0)(0)(5)(0)(0)(0)
Burst Level
Non Inversion
BFHP
Burst Level Inversion
BFRN
Open Voltage
Open Voltage
Open Voltage
Open Voltage
Open Voltage
V (YIN) = 0.6VP - P, 1MHz
GYN (6MHz) - GYN (1MHz)
V (YIN) = 0.5VP - P, Standard
Staircase
8
%
-3
0
3
deg
BLN = a - b
0.59
0.68
0.77
V
BLK = c - b
-0.1
0
0.1
V
0.5
dB
150
165
mV
-165
-150
-135
mV
V (B-YIN) = 1VP - P, 1MHz
-0.5
0
0.5
dB
(0)(0)(0)(0)(5)(5)(5)(0)(0)(0)
(0)(0)(0)(0)(0)(5)(5)(0)(0)(0)
7 Voltage: g
7 Voltage: h
135
150
165
mV
(0)(0)(0)(5)(5)(5)(5)(0)(0)(0)
7 Voltage: i
-165
-150
-135
mV
R-Y Switching Speed
(X)(0)(0)(0)(0)(0)(5)(5)(0)(0)
X = 1MHz 5VPP Rectangular
Wave
*100
nS
B-Y Switching Speed
(X)(0)(0)(0)(0)(0)(5)(5)(0)(0)
X = 1MHz 5VPP Rectangular
Wave
*100
nS
Inversion BLK
R-Y
Voltage Gain
Burst Level
Non Inversion
Burst Level Inversion
B-Y
Voltage Gain
BFRP = g - h
BFRN = g - i
-8
*Remark 1) *Item indicates design assurance rating.
-6-
Ver.2004-02-17
NJM2256
■ ELECTRICAL CHARACTERISTICS
PARAMETER
CONTROL PIN
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
3 4 5 10 12 14 15 16 19 20
Character Output Level 1
C Inversion
White
Y
R-Y
B-Y
Yellow
Y
R-Y
B-Y
Cyanoge
Y
R-Y
B-Y
Green
Y
R-Y
B-Y
Magenta
Y
R-Y
B-Y
Red
Y
R-Y
B-Y
Blue
Y
R-Y
B-Y
Black
Y
R-Y
B-Y
Character Output Level 2
C Inversion
White
Y
R-Y
B-Y
Yellow
Y
R-Y
B-Y
Cyanoge
Y
R-Y
B-Y
Green
Y
R-Y
B-Y
Magenta
Y
R-Y
B-Y
Red
Y
R-Y
B-Y
Blue
Y
R-Y
B-Y
Black
Y
R-Y
B-Y
Ver.2004-02-17
)
MPWY
MPWR
MPWB
MPYY
MPYR
MPYB
MPCY
MPCR
MPCB
MPGY
MPGR
MPCB
MPMY
MPMR
MPMB
MPRY
MPRR
MPRB
MPBY
MPBR
MPBB
MPPY
MPPR
MPPB
(5)(5)(5)(0)(0)(0)(5)(5)(0)(0)
(5)(5)(0)(0)(0)(0)(5)(5)(0)(0)
(0)(5)(5)(0)(0)(0)(5)(5)(0)(0)
(0)(5)(0)(0)(0)(0)(5)(5)(0)(0)
(5)(0)(5)(0)(0)(0)(5)(5)(0)(0)
(5)(0)(0)(0)(0)(0)(5)(5)(0)(0)
(0)(0)(0)(0)(0)(0)(5)(5)(0)(0)
(0)(0)(0)(0)(0)(0)(5)(5)(0)(0)
1
9
7
1
9
7
1
9
7
1
9
7
1
7
7
1
9
7
1
9
7
1
9
7
Voltage: A, MPWY = A - V1
Voltage: B, MPWR = B - V9
Voltage: C, MPWB = C - V7
Voltage: A, MPYY = A - V1
Voltage: B, MPYR = B - V9
Voltage: C, MPYR = C - V7
Voltage: A, MPCY = A - V1
Voltage: B, MPCR = B - V9
Voltage: C, MPCB = C - V9
Voltage: A, MPGY = A - V1
Voltage: B, MPGR = B - V9
Voltage: C, MPGB = C - V7
Voltage: A, MPMY = A - V1
Voltage: B, MPMR = B - V9
Voltage: C, MPMB = C - V7
Voltage: A, MPRY = A - V1
Voltage: B, MPRR = B - V9
Voltage: C, MPRB = C - V7
Voltage: C, MPBY = A - V1
Voltage: B, MPBR = B - V9
Voltage: C, MPBB = C - V7
Voltage: A, MPPY = A - V1
Voltage: B, MPPR = B - V9
Voltage: C, MPPB = C - V7
630
-16
-14
472
13
--165
409
-232
28
252
-197
-117
378
155
77
220
186
-72
156
-53
127
-20
-14
-12
700
0
0
525
33
-146
455
-209
50
280
-176
-97
420
176
97
245
209
-50
175
-33
146
0
0
0
770
16
14
578
53
-127
501
-186
72
308
-155
-77
462
197
117
270
232
-28
194
-13
165
20
14
12
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
1
9
7
1
9
7
1
9
7
1
9
7
9
9
7
1
9
7
1
9
7
1
9
7
Voltage: A, MNWY = A - V1
Voltage: B, MNWR = B - V9
Voltage: C, MNWB = C - V7
Voltage: A, MNYY = A - V1
Voltage: B, MNYR = B - V9
Voltage: C, MNYB = C - V7
Voltage: A, MNCY = A - V1
Voltage: B, MNCR = B - V9
Voltage: C, MNCB = C - V7
Voltage: A, MNGY = A - V1
Voltage: B, MNGR = B - V9
Voltage: C, MNGB = C - V7
Voltage: A, MNMY = A - V1
Voltage: B, MNMR = B - V9
Voltage: C, MNMB = C - V7
Voltage: A, MNRY = A - V1
Voltage: B, MNRR = B - V9
Voltage: C, MNRB = C - V7
Voltage: A, MNBY = A - V1
Voltage: B, MNBR = B - V9
Voltage: C, MNBR = C - V7
Voltage: A, MNPY = A - V1
Voltage: B, MNPR = B - V9
Voltage: C, MNPB = C - V7
630
-16
-14
472
-53
127
409
186
-72
252
155
77
378
-197
-117
220
-232
28
156
13
-165
-20
-14
-12
700
0
0
525
-33
146
455
209
-50
280
176
97
420
-176
-97
245
-209
50
175
33
-146
0
0
0
770
16
14
578
-13
165
501
232
-28
308
197
117
462
-155
-77
270
-186
72
194
53
-127
20
14
12
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
)
MNWY
MNWR
MNWB
MNYY
MNYR
MNYB
MNCY
MNCR
MNCB
MNGY
MNGR
MNGB
MNMY
MNMR
MNMB
MNRY
MNRR
MNRB
MNBY
MNBR
MNBR
MNPY
MNPR
MNPB
(5)(5)(5)(0)(0)(0)(5)(5)(0)(0)
(5)(5)(0)(5)(0)(0)(5)(5)(0)(0)
(0)(5)(5)(5)(0)(0)(5)(5)(0)(0)
(0)(5)(0)(5)(0)(0)(5)(5)(0)(0)
(5)(0)(5)(5)(0)(0)(5)(5)(0)(0)
(5)(0)(0)(5)(0)(0)(5)(5)(0)(0)
(0)(0)(5)(5)(0)(0)(5)(5)(0)(0)
(0)(0)(0)(5)(0)(0)(5)(5)(0)(0)
-7-
NJM2256
NJM2256
■ APPLICATION NOTES
I / O Explanation
● Supply Voltage
V+
GND
● Input Signals
Y
R-Y
B-Y
● Output Signals
Y
R-Y
B-Y
-8-
5V
0.7VP - P
1.0VP - P
0.7VP - P
0.7VP - P
1.0VP - P
0.7VP - P
2
11
17
8
6
1
9
7
Ver.2004-02-17
NJM2256
■ APPLICATION NOTES
I / O Explanation
● Control Pin Low=0V, HIGH=5V
R 3
G 4
Superimposed color adjustment
B 5
Clamp Pulse
15
Character Pulse 16
Y, R-Y, B-Y signal process pulse input
HBF Pulse
12
BLK Pulse
20
C Inversion
10
Color difference, brightness inverting pin
Y Inversion
19
NTS / PAL Switch 14
● Adjusting Pin (Normally open → non adjustment)
BF level
13 Burst flag insert level adjusting pin.
Inversion set up correction 18 Y inversion signal level adjusting pin.
1. Input Signal
Superimposed color level shall be determined by the following standard signal level.
0.7VP - P
Y
R-Y
1.0VP - P
B-Y
0.7VP - P
The character output standard level on the specification shall be determined through calculation out of 75% of
superimposed color level.
(In order to avoide the clipping of the encoding signal, the character output level is determined to lower level)
● The character output level converting expression
The basic expression
ER - EY = 0.70ER - 0.59EG - 0.11EB
EB - EY = - 0.30ER - 0.59EG + 0.89EB
EY = 0.30ER + 0.59EG + 0.11EB
From standard level and practical input level, each color signal level imposed in R-Y, B-Y and Y signals are
as in the following.
VR - Y = 0.75 × 1 [VP - P] × ER – Y / 1.4
= 0.375ER - 0.316EG - 0.059EB
VB - Y = 0.75 × 0.7 [VP-P] × EB – Y / 1.78
= - 0.088ER - 0.174EG + 0.263EB
VY = 0.75 × 0.7 [VP - P] × EY / 1
= 0.158ER + 0.310EG + 0.058EB
(ER, EG, EB, LOW 0, HIGH 1)
2. Clamp Pulse
During the interval of blanking, input the pulse through clamp pulse pin 20 the blanking level (0 level) of input signal
(Y, R-Y, B-Y) is to be fixed at the bias point within the IC.
Note) The pulse width of clamp pulse shall be set more than 3 µs. (see figure 2)
Flg. 2 Clamp Pulse Width
Ver.2004-02-17
-9-
NJM2256
3. Character Color adjustment
Superimposed color adjustment of the character can be determined in eight different colors, by choosing R, G, B input
levels.
(LOW 0V, HIGH 5V)
R
G
B
COLOR
5
5
5
5
5
0
White
Yellow
0
0
5
5
5
0
Cyan
Green
5
5
0
0
5
0
Magenta
Red
0
0
0
0
5
0
blue
Black
Character Color Selecting Code
4. Character Insertion
Pulse informations from outside character generater shall be given input at the character pulse pin 16 . During the
period of pulse process, the selected color level shall be inserted into each Y, R-Y, B-Y.
5. Burst Flag Insertion
Inputting burst period pulse at the HBF pin 12 , the burst flag (150mV) can be inserted in the B-Y, R-Y signals. At the
same time, by putting NTSC / PAL switch 14 , the burst flag can be altered to NTSC or PAL system.
NTSC / PAL SWITCH 14
R-Y Signal
B-Y Signal
LOW 0V (PAL)
HIGH 5V (NTSC)
+150mV
-150mV
non insertion
-150mV
Burst Flag Inserting
Flg.3 Burst Flag Inserting Example
- 10 -
Ver.2004-02-17
NJM2256
6. C Inversion
The color phase of the picture shall be inverted for one hundred and eighty degrees setting C inversion pin 10 . It is
applied that the reference signal (burst flag) shall be inverted into one hundred and eighty degrees at the time of
de-coding.
Superimposed character color do not change at the picture inversion.
C INVERSION PIN 10
Burst
LOW 0V
HIGH 5V
Non Inversion
Inversion
C Inversion Form
7. Y Inversion
The brightness of the picture shall be inverted by setting Y inversion 19 . It is that Y signal shall be inverted by the
inverter, and then blanking period signal shall be adjusted to the black level with blanking pulse.
Figure 4. Y Inversion Output Example
Y INVERSION PIN 19
Y Output
LOW 0V
HIGH 5V
Non inversion
Inversion
Y Inversion Form
8. Adjusting pin
(1) BF Level Pin 13
It is the burst flag minor adjusting pin. The burst level shall be adjusted at the open voltage, 0.3V level
adjustment. Therefore, the most recommended on operation with the open condition, as it has been controlled
st 135 at 165 mV (burst level) on specification.
(2) Inversion Set Up Correction Pin 18
It is the minor adjusting pin of Y inversion signal level. The inverting black level shall be adjusted at the open
voltage, 1.8V level adjustment. Therefore, the most recommended on operation with the open condition, as it
has been controlled with 0.59 to 0.77 V (inverting black level) on specification.
Ver.2004-02-17
- 11 -
NJM2256
9. Pulse Timing
The pulse input timing should be proceeded as in the following.
■ TYPICAL APPLICATION
NJM2256
- 12 -
Ver.2004-02-17
NJM2256
■ APPLICATION
This IC requires 1MΩ resistance between INPUT and GND pin for clamp type input since the minute current causes an
unstable pin voltage.
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
Ver.2004-02-17
- 13 -
