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LM1269 Scheda tecnica(PDF) 10 Page - National Semiconductor (TI) |
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LM1269 Scheda tecnica(HTML) 10 Page - National Semiconductor (TI) |
10 / 20 page Pin Descriptions (Continued) Pin No. Pin Name Schematic Description 18 19 20 Blue Video Out Green Video Out Red Video Out Video outputs of the LM1269. The ideal driver for this part is the LM246X CRT driver family, which has the necessary gain of 26 dB or 20 V/V. 21 V Ref Out A 0.1 µF capacitor must be placed close to this pin for decoupling the internal V Ref. This pin may be used for an external voltage reference with proper buffering. 22 ABL The Auto Beam Limit control reduces the gain of the video amplifier in response to a control voltage proportional to the CRT beam current. The ABL acts identically on all three channels. ABL is required for CRT life and X-ray protection. 23 Clamp Pulse This input accepts a standard TTL or CMOS input. A positive signal activates the clamp pulse for DC restoration of the video input. The AC coupling capacitors at the video inputs are used for holding the DC correction voltage, eliminating the need for additional capacitors. 24 H Flyback H flyback is an analog signal input from the monitor horizontal scan. The LM1269 is able to generate an accurate blanking pulse in the video outputs from this input. The horizontal flyback from the monitor must be a clean signal, with no ringing or other noise on the signal. www.national.com 10 |
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