n overview the AN2458SH is a color encoder ic for ntsc/ pal-compatible ccd video camera. it outputs chro- ma signal after modulation of inputted rCy and bCy color difference signals with subcarrier signals. n 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) AN2458SH color encoder ic (ntsc/pal) for ccd video camera n block diagrams 5.5 0.3 7.5 0.3 (0.5) 0.1 0.1 0.15 0.65 0.1 1.5 0.2 + 0.1 ?0.05 0.65 0.1 6.5 0.3 0.5 0.2 0.1 1 12 24 13 unit:mm 24-pin ssop package (ssop024-p-0300) 24 23 22 21 20 19 18 17 16 15 14 13 123456789101112 b? in gnd b? off b? sc 90. adj hue.c hue. cr burst level nc chroma out hue.r hue mod gc blk lim. dc cont. cp2 blk v cc cp2 nc v cc cp2. in blk. in dc. cont. c bf in hue cont. r? sc r? off r? in v ref v ref nc mod clamp clamp mod cp2 nc gc + + + blk
i cc v 5 v cc = 4.8v, v ref = 1.8v v cc = 4.8v, v ref = 1.8v diffrence from v ref 1.8 2.3 2.8 v v 11 v cc = 4.8v, v ref = 1.8v terminal voltage pin11 supply current terminal voltage pin5 12.0 ?00 16.0 0 20.0 100 ma mv parameter min condition typ max unit symbol v th (cp2?) v cc = 4.8v, v ref = 1.8v 2.0 2.4 2.8 v v th (cp2?) v cc = 4.8v, v ref = 1.8v cp2 threshold 2 cp2 threshold 1 1.5 1.8 2.1 v 1.9 2.2 2.5 v v th (blk) v cc = 4.8v, v ref = 1.8v blk threshold v 20 v cc = 4.8v, v ref = 1.8v diffrence from v ref terminal voltage pin20 ?00 0 100 mv g v1 v cc = 4.8v, v ref = 1.8v 250mv p? input r? gain 480 600 720 mv p? g v2 v cc = 4.8v, v ref = 1.8v 250mv p? input b? gain ?.0 ?.5 ?.5 db g v3 v cc = 4.8v, v ref = 1.8v 600mv p? input chroma clip 0.5 3.0 4.5 db g v4 v cc = 4.8v, v ref = 1.8v 250mv p? input blk = 3v op blk control 300 600 900 mv p? g v5 v cc = 4.8v, v ref = 1.8v v 9 = v ref burst gc (1) 290 350 430 mv p? g v6 v cc = 4.8v, v ref = 1.8v v 9 = v ref 0.5v burst gc (2) 1.5 3.0 4.5 db g v7 v cc = 4.8v, v ref = 1.8v v 9 = v ref 0.5v burst gc (3) ?.0 ?.5 ?.5 db q 1 v cc = 4.8v, v ref = 1.8v v 19 = v ref + 0.5v burst phase (1) ?5 ?0 ?5 deg q 2 v cc = 4.8v, v ref = 1.8v v 19 = v ref 0.5v burst phase (2) 01530deg n electrical characteristics (ta=25 2?c) parameter symbol rating unit v cc i cc p d t opr t stg 25 120 ?0 to +75 ?5 to +125 supply voltage supply current power dissipation operating ambient temperature note 1) storage temperature note 1) 5.5 v mw ma ?c ?c note 1) ta=25?c except operating ambient temperature and storage temperature. n absolute maximum ratings parameter symbol range operating supply voltage range v cc 4.6v to 5.0v n recommended operating range (ta=25?c)
n application circuit color difference (b?) input gnd n. c. subcarrier (0?) off pin no. 1 2 3 4 pin name clamp pulse input v cc ( 4.8v typ.) n. c. blanking pulse input 13 14 15 16 subcarrier(0?) input 5 dc playback capacitor 17 90?adjustment 6 burst flag input 18 phase-shift capacitor 7 phase adjustment 19 phase-shift capacitor 8 subcarrier (90?/270?) input 20 burst amplitude adjustment 9 subcarrier (90?/270?) off 21 phase-shift resistors 12 v ref ( 1.8v typ.) 24 n. c. 10 n. c. 22 chroma plus burst output 11 color difference (r?) input 23 pin name pin no. n pin descriptions 24 23 22 21 20 19 18 17 16 15 14 13 12345 6789101112 AN2458SH 1k *10pf 10kb 6400 1 k 27k 10k 0.001 f 1500 6800 6800 0.001 f 1500 sc0?in sc90?in b?sig.in r?sig.in 0.22 f 0.22 f 50kb 50kb 90.adj. burst level chroma level bpf 1k 1k chroma out 22 h 100 f 16.3v v cc (typ.4.8v) + 0.047 f 50kb 6400 10k 1k 10kb 27k 47 f 16.3v v ref (typ.1.8v) bf (burst flag) in blk (blan king) in cp2 (clamp pulse) in + 22 k 22 k hue * the phase-shift capacitor is typically 10 pf for both ntsc and pal.
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