n overview the an3497sb is a chroma noise reduction (cnr) ic for vcr and uses a chroma recursive filter system. in combination with the an2260 (luminance signal process- ing), an2460 (chroma signal processing), etc., it config- ures a vhs signal processing system. n features capable of meeting with the ntsc/pal system. capable of meeting with the edit mode and thru mode. the cnr limiter level and cnr output level can be adjust- ed depending on external dc. the feedback constant (kc) can be set optionally depend- ing on an external resistor. the chroma signal can be adjusted depending on an external resistor. built-in functions such as y vertical correlative signal detector, etc. 1 ics for vcr an3497sb chroma noise reduction ic 1 89 16 0.35 0.1 0.8 0.1 0.1 4.3 0.3 6.3 0.3 0.5 0.15 0.65 1.5 0.2 6.5 0.3 unit : mm 16-pin panaflat package (ssop-016-p-0225a) 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 v cc gnd ef 0db a2 lpf det. sw gca b1 8.1db ceq ?.1db ?3.2db 20db 20db a1 ctl cor ?0.8db ?.1db ?3.2db b 2 lim. ?.5db 22k w 33k w ?0.8db n block diagram
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