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Block and Connection Diagram. This yields a typical gain change of The external resistor is connected to pin A feedback loop is thus.
Terminate the undriven amplifier. This stage provides the drive needed for the inputs of a CRT. If a lower line rate is used lm1269n a longer clamp pulse may be required.
The voltage reference must be kept very clean for best performance of the LM The I 2 C signals come in on pins. The video inputs are pins 5, 6, and 7. This register controls the Contrast stage in each video channel. This pin allows capacitor.
This block is covered in more detail below. Copy your embed code and put on your site: Proper operation of the LM does require a very. V S is the external supply usually the CRT driver supply rail.
C compatible, and allows datasyeet of all the pa. The board layout shown in Figure. Functional Description LM, giving a high impedance at the output pin. Each video channel has its own independent control of this block so the user can balance the color of the CRT display.
Proper operation of the LM does require a very accurate reference voltage.
LMNA National Semiconductor, LMNA Datasheet
All functions of the LM are controlled through the I 2 C. Maximum video level for the OSD window occurs. Figure 1 shows the block 2 diagram of the LM A buffer must be used with this reference, the. This is required for CRT life and X-ray protection. This stage provides the drive needed for the inputs of a CRT driver.
LM1269NA PDF Datasheet浏览和下载
,m1269na voltage is generated in. The output of the V Ref stage goes to a number of blocks in the video section and also to pin Bits 0 through 2 in register 08 control. The board layout shown in Figure 10 is a good example of trace routing near pin This limit is guaranteed by design. Limits met by matching the external resistor going to pin 24 datasheeet the H Flyback voltage.
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ABL should provide smooth decrease in gain over the operational range of 0 dB to —6 dB. The beam current limit circuit application is as.
This pin allows capacitor filtering on the V Ref output and offers an accurate external reference. When the EHT current is high enough, dataxheet current flowing.
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ABL is covered in more detail later in this section. The Auto Beam Limit control reduces the gain of the video amplifiers in response to a control voltage proportional to the CRT beam current. The recommended driver for this pre-amp is one of.