LMNA datasheet, LMNA circuit, LMNA data sheet: NSC – MHz I2C Compatible RGB Video Amplifier System with OSD & DACs, alldatasheet. LMNA Datasheet PDF Download -, LMNA data sheet. LMNA/NOPB IC PREAMP CMOS MHZ DIP National Semiconductor datasheet pdf data sheet FREE from Datasheet (data sheet).
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Test Circuit Note load includes parasitic capacitance. All other trademarks are the property of their respective owners. This voltage is generated in.
Input from signal generator: Download datasheet 2Mb Share this page. All functions of the Datashwet are controlled through the I 2 C.
Terminate the undriven amplifier inputs to simulate generator loading. All ones will give no attenuation. To insure an accurate voltage over tem. This stage provides the drive needed for the inputs of a CRT. This pin has a very.
The ABL acts on all three channels in an identical manner. The output of the Buffer Amp goes to the Contrast stage. Proper operation of the LM does l1m269na a very. Scope and generator response used for testing: The OSD signal is mixed with the video signal at the output of this stage.
The IC clamps the input voltage to a low impedance voltage source the 5V supply rail. Details on the internal registers are covered in the. Datssheet video black level is used for this test. Load resistors are not required and are not used in the test circuit, therefore all. The output of the V Ref stage goes to a number of blocks in the video section and also to pin Since the video must be Datasehet coupled to the LM, the dafasheet cap is also used to store the reference voltage for DC restoration.
A pF cap is charged to the specified voltage, then discharged directly into the. A minimum pulse width of ns is guaranteed for a horizontal line of 15 kHz. This block is covered in more detail below. These eight bits determine the output voltage of DAC 3.
This voltage is generated in the V Ref block. Black level clamping of the signal is carried out directly on the AC coupled input signal into the high impedance pream- plifier input, thus eliminating the need for additional black level clamp capacitors.
Machine Model ESD test is covered by specification All voltages are measured with respect to GND, unless otherwise specified. Bits 3 and 4 of register 08h. Since the video must be AC coupled to. The IC is I 2 C compatible, and allows control of all the pa- rameters necessary to directly setup and adjust the gain and contrast in the CRT display.
The video inputs are pins 5, 6, and 7. This current level determines the ABL threshold and is given by: The voltage reference must be kept very clean for best performance of the LM The Auto Beam Limit control reduces the gain of the video amplifiers in response to a control voltage proportional to the CRT beam current. ABL is covered in more detail later in. The protocol of the interface begins with the Start Pulse followed by a byte comprised of a seven-bit Slave Device Address and a Horizontal blanking is also added to the.
Looking at the red. Figure 1 shows the block 2 diagram of the LM Minimum video level will occur with both bits set to a zero. I 2 C Interface Registers Section. Page 15 Schematic Continued 15 www. This yields a typical gain change of. Any noise injected into pin 21 will appear on the video. V S is the external supply usually the CRT driver supply rail. The LM pre-amp is designed to work in cooperation.
This block is covered. If a lower line rate is used then a longer clamp pulse may be required. The video and OSD blocks.
Bits 0 through 2 in register 08 control this stage. This register datasjeet the Contrast stage in each video channel. The board layout shown in Figure. The Auto Beam Limit control reduces the gain of the.