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AN2458SH
Color Encoder IC (NTSC/PAL) for CCD Video Camera
s 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.
Unit:mm
1
24
0.5
s 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 5C)
12
13
0.20.1
0.10.1
0.650.1
0.1 0.15 + 0.05 -
(0.5) 5.50.3 7.50.3
24-Pin SSOP Package (SSOP024-P-0300)
s Block Diagrams
VREF
24
R-Y IN
23 22 NC
R-Y OFF
21
HUE R-Y SC Cont. BF IN
20 19 18
DC. Cont. C
17
BLK. IN
16 15 NC BLK
VCC
14
CP2. IN
13
VREF
DC Cont. Clamp MOD + CP2 Lim. BLK BLK MOD GC
VCC
CP2
Clamp CP2
MOD
GC + HUE
+
NC 1 2 3 4 5 6 7 8 9 10 11 12
B-Y IN GND
B-Y OFF
B-Y SC
90. ADJ
HUE.C HUE. BURST CR LEVEL
NC
CHROMA HUE.R OUT
0.650.1
1.50.2
6.50.3
s Absolute Maximum Ratings
Parameter Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature Note 1)
Note 1)
Symbol VCC
ICC
Rating 5.5 25 120 -20 to +75 -55 to +125
Unit V mA mW C C
PD Topr Tstg
Note 1) Ta=25C except operating ambient temperature and storage temperature.
s Recommended Operating Range (Ta=25C)
Parameter Operating supply voltage range Symbol VCC Range 4.6V to 5.0V
s Electrical Characteristics (Ta=252C)
Parameter 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) Symbol ICC VTH (CP2-1) VTH (CP2-2) VTH (BLK) V5 V11 V20 GV1 GV2 GV3 GV4 GV5 GV6 GV7 1 2 Condition VCC=4.8V, VREF=1.8V VCC=4.8V, VREF=1.8V VCC=4.8V, VREF=1.8V VCC=4.8V, VREF=1.8V VCC=4.8V, VREF=1.8V diffrence from VREF VCC=4.8V, VREF=1.8V VCC=4.8V, VREF=1.8V diffrence from VREF VCC=4.8V, VREF=1.8V 250mVP-P input VCC=4.8V, VREF=1.8V 250mVP-P input VCC=4.8V, VREF=1.8V 600mVP-P input VCC=4.8V, VREF=1.8V 250mVP-P input BLK=3VOP VCC=4.8V, VREF=1.8V V9=VREF VCC=4.8V, VREF=1.8V V9=VREF0.5V VCC=4.8V, VREF=1.8V V9=VREF-0.5V VCC=4.8V, VREF=1.8V V19=VREF+0.5V VCC=4.8V, VREF=1.8V V19=VREF-0.5V min 12.0 1.5 2.0 1.9 -100 1.8 -100 480 -7.0 0.5 300 290 1.5 -6.0 -45 0 typ 16.0 1.8 2.4 2.2 0 2.3 0 600 -5.5 3.0 600 350 3.0 -4.5 -30 15 max 20.0 2.1 2.8 2.5 100 2.8 100 720 -3.5 4.5 900 430 4.5 -2.5 -15 30 Unit mA V V V mV V mV mVP-P dB dB mVP-P mVP-P dB dB deg deg
s Application Circuit
VREF (typ.1.8V)
BLK (BLan King) IN BF (Burst Flag) IN CP2 (Clamp Pulse) IN
27k
HUE 50kB
47F 16.3V
+ 10kB 6400 10k
+
0.047 F 22H VCC 100F 16.3V (typ.4.8V)
1k
24 23 22 21 20 19 18 17 16 15 14 13 R-Ysig.IN 0.22F 1 B-Ysig.IN 0.22F 10k 10kB 6800 SC90IN 1500 0.001 F 6400 27k SC0IN 1 k *10pF 22 k 1k 22 k 2 3 4
AN2458SH
5 6 7 8 9 10 11 12
6800
0.001 F 1500
50kB 90.Adj.
50kB Burst Level Chroma Level 1k BPF 1k CHROMA OUT
* The phase-shift capacitor is typically 10 pF for both NTSC and PAL.
s Pin Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 GND N. C. Subcarrier (0) OFF Subcarrier(0) input 90adjustment Phase-shift capacitor Phase-shift capacitor Burst amplitude adjustment Pin name Color difference (B-Y) input Pin No. Pin name 13 Clamp pulse input 14 VCC (4.8V typ.) 15 N. C. 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 VREF (1.8V typ.)
10 N. C. 11 Chroma plus burst output 12 Phase-shift resistors

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