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Download datasheet 2Mb Share this page. The ABL acts on all three channels in an identical manner. ABL should provide smooth decrease in gain over the operational range of 0 dB to —6 dB.
A feedback loop is thus established which acts to prevent the average beam current exceeding I ABL. With such a high impedance the DC restoration can appear to be working for a number of minutes after the clamp pulse is removed. This voltage is generated in the V Ref block. To insure an accurate voltage over tem- perature, an external resistor datashee used to set the current in the V Ref stage.
Proper operation of the LM does require a very accurate reference voltage.
LMNA 데이터시트(PDF) – National Semiconductor (TI)
The 7 bit contrast register 03h sets the contrast level through the I 2 C bus. Horizontal blanking is also added to the.
Measure output levels of the other two undriven amplifiers relative to the driven amplifier to determine channel separation. The blocks for both the green and blue channels are not shown; how- ever, they are identical to the red channel.
Page 15 Schematic Continued 15 www. Page 14 Schematic www. A buffer must be used with this reference, the. Minimum video level will occur with both bits set to a zero. It is the difference in. This register controls the Contrast stage in each video channel. This limit km1269na guaranteed by design. The video inputs are pins 5, 6, and 7.
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satasheet A pF cap is charged to the specified voltage, then discharged directly into the. The recommended driver for this pre-amp is one of. The ABL acts on all three channels.
The board layout shown in Figure. The OSD signal is mixed with the video signal at the output of this stage.
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Linearity Error is the variation in step height of a 16 step staircase input signal waveform with 0. This yields a typical gain change of This enables the user to Bits 0 through 2 in register 08 dataxheet this stage.
The beam current limit circuit application is as. Functional Description LM, giving a high impedance at the output pin. If a lower line rate is used then a longer clamp pulse may be required.
The video and OSD blocks. All other trademarks are the property of their respective owners. Looking at the red. Black level clamping of the signal is carried out directly on. With such a high impedance the DC restoration can appear. Machine Model ESD test is covered by specification This voltage is generated in.
Load resistors are not required and are not used in the test circuit, therefore all. This stage provides the drive needed for the inputs of a CRT driver. The output of this stage is used as the feedback for the DC restoration loop. C compatible, and allows control of all the pa.
The Auto Beam Limit control dataeheet the gain of the video amplifiers in response to a control voltage proportional to the CRT beam current. Minimum video level will occur with. Using the RSS technique the scope and.
Using the RSS technique the scope and generator response have been removed from the output rise and fall times.