NJM2256

The NJM2256 has the following features including 5 V Single Power Supply;8 Types Color Super-imposes;Burst Fluff= Insert C'unction;Y Inversion, C Inversion l;unction;NTSC/PAL Matching;Non Operational Adjustment;Less External Parts;Higher switching speed can be made comparing to N7M2247;Package Outline DMP20;B ipolar Technology.

NJM2256 is the mufti-functional color super-imposer IC for video base band (Y, R-Y, B-Y), Various type of Y, R-Y, B-Y output signals can be made by the digital controlled signals.The signal control at the base band, made it possible on operation with less external parts, as well as for non adjustment on opertaion.NJM2256 can be operated much higher switching speed comparing to NJM2247.The color phase of the picture shall be inverted for ane 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.NJM2256 is the briblitness level inversion. The imposed character color shall not be changed. This function shall be proceeded the switching Y signal output to the inverter side.

Pulse informations from outside character benerater 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. The color phase of the picture shall be inverted for one hundred and eighty degrees setting C inversion pin 10.NJM2256 is applied that the reference signal (burst flag) shaft be inverted into one hundred and eighty degrees at the time of de-coding.Superimposed character color do not change at the picture inversion.NJM2256 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 at l35 to 165mV (burst level) on specification.It is the minor adjusting pin of Y inversion signal level. The inverting black level shall be adjusted at the open voltage, 1,8 V level adjustment. Therefore, the most recommended on operation with the open condition, as NJM2256 has been controlled with 0.59 to 0.77 V (inverting black level) on specification.