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AN2458SH
Color Encoder IC (NTSC/PAL) for CCD Video Camera
■ Overview
The AN2458SH is a color encoder IC for NTSC/
PAL-compatible CCD video camera. It outputs chroma signal after modulation of inputted R–Y and B–Y
color difference signals with subcarrier signals.
1
Unit:mm
24
0.50.2±0.1
6.5±0.3
■ Features
• Compatible with NTSC and PAL
• Carrier leak adjustment available
• Built-in blanking circuit
• Color phase adjustment available
• Improved temperature characteristics of color phase
shift (within ±5˚C)
■ Block Diagrams
R–Y IN
V
REF
24 23 22 21 20 19 18 17 16 15 14 13
V
REF
R–Y
R–Y SC
OFF
NC
MODClamp
+
HUE
Cont.
BF IN
DC.
Cont. C
DC Cont.
12
0.1±0.1
(0.5)
24-Pin SSOP Package (SSOP024-P-0300)
BLK. IN
BLK V
CP2
5.5±0.3
7.5±0.3
NC
VCCCP2. IN
BLKLim.
BLK
13
0.65±0.1
1.5±0.2
+ 0.1
– 0.05
0.15
0.65±0.1
CP2
CC
HUE
HUE.
CR
MOD GC
BURST
LEVEL
NC
Clamp MOD
CP2
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B–Y IN
GND
NC
B–Y
OFF
GC
B–YSC90.
ADJ
+
HUE.C
+
CHROMA
OUT
HUE.R
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■ Absolute Maximum Ratings
Parameter Symbol Rating Unit
Supply voltage
Supply current
Power dissipation
Operating ambient temperature
Storage temperature
Note 1)
Note 1)
V
CC
I
CC
P
D
T
opr
T
stg
Note 1) Ta=25˚C except operating ambient temperature and storage temperature.
■ Recommended Operating Range (Ta=25˚C)
Parameter Symbol Range
Operating supply voltage range
V
CC
■ Electrical Characteristics (Ta=25±2˚C)
Parameter minCondition typ max UnitSymbol
Supply current
CP2 threshold 1
CP2 threshold 2
BLK threshold
Terminal voltage Pin5
Terminal voltage Pin11
Terminal voltage Pin20
R–Y GAIN
B–Y GAIN
CHROMA CLIP
BLK CONTROL
BURST GC (1)
BURST GC (2)
BURST GC (3)
BURST PHASE (1)
BURST PHASE (2)
V
V
V
I
TH (CP2–1)
TH (CP2–2)
TH (BLK)
V
V
V
G
G
G
G
G
G
G
CC
5
11
20
V1
V2
V3
V4
V5
V6
V7
θ1
θ2
V
4.8V, V
CC=
V
CC=
V
CC=
V
CC=
V
CC=
diffrence from V
V
CC=
V
CC=
diffrence from V
V
CC=
250mV
V
CC=
250mV
V
CC=
600mV
V
CC=
250mV
BLK=3V
V
CC=
V
9=
V
CC=
V
9=VREF±
V
CC=
V
9=VREF–
V
CC=
V
19=VREF+
V
CC=
V
19=VREF–
4.8V, V
4.8V, V
4.8V, V
4.8V, V
4.8V, V
4.8V, V
4.8V, V
P–P
4.8V, V
P–P
4.8V, V
P–P
4.8V, V
P–P
4.8V, V
V
REF
4.8V, V
4.8V, V
4.8V, V
4.8V, V
input
input
input
input
OP
0.5V
0.5V
0.5V
0.5V
REF=
REF=
REF=
REF=
REF=
REF=
REF=
REF=
REF=
REF=
REF=
REF=
REF=
REF=
REF=
REF=
1.8V
1.8V
1.8V
1.8V
1.8V
REF
1.8V
1.8V
REF
1.8V
1.8V
1.8V
1.8V
1.8V
1.8V
1.8V
1.8V
1.8V
5.5 V
25
120
–20 to +75
–55 to +125
4.6V to 5.0V
12.0
16.0020.0
1.5 1.8 2.1 V
2.0 2.4 2.8 V
1.9 2.2 2.5 V
–100
1.8 2.3 2.8 V
–100 0 100 mV
480 600 720 mV
–7.0 –5.5 –3.5 dB
0.5 3.0 4.5 dB
300 600 900 mV
290 350 430 mV
1.5 3.0 4.5 dB
–6.0 –4.5 –2.5 dB
–45 –30 –15 deg
01530deg
mA
mW
˚C
˚C
100mAmV
P–P
P–P
P–P
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■ Applica tion Circuit
V
REF
(typ.1.8V)
BLK (BLan King) IN
BF (Burst Flag) IN
CP2 (Clamp Pulse) IN
R–Ysig.IN
B–Ysig.IN
SC90˚IN
SC0˚IN
0.22µF
0.22µF
6800Ω
6800Ω
*
The phase-shift capacitor is typically
10 pF for both NTSC and PAL.
47µF
16.3V
0.001
0.001
1500Ω
27kΩ
+
10kB
1kΩ
10kΩ
24 23 22 21 20 19 18 17 16 15 14 13
HUE
6400Ω
50kB
0.047
µF
22µH
V
+
100µF 16.3V
CC
(typ.4.8V)
AN2458SH
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10kB
10kΩ
6400Ω
µF1500Ω
µF
27kΩ
1
kΩ
50kB 50kB
90.Adj. Burst
1kΩ*10pF
22
kΩ
Level
22
kΩ
Chroma
Level
1kΩ
BPF
1kΩ
CHROMA
OUT
■ Pin Descriptions
Pin No.
Color difference (B–Y) input
1
2
GND
N. C.
3
4
Subcarrier (0˚) OFF
5
Subcarrier(0˚) input
6
90˚adjustment
7
Phase-shift capacitor
8
Phase-shift capacitor
9
Burst amplitude adjustment
10
N. C.
11
Chroma plus burst output
12
Phase-shift resistors
Pin name
Pin No.
Clamp pulse input
13
14
V
CC (
N. C.
15
16
Blanking pulse input
17
DC playback capacitor
18
Burst flag input
19
Phase adjustment
20
Subcarrier (90˚/270˚) input
21
Subcarrier (90˚/270˚) OFF
22
N. C.
23
Color difference (R–Y) input
24
V
REF (
Pin name
4.8V typ.)
1.8V typ.)
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