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The IC is I 2 C compatible, and allows control of all the pa. Brightness and bias can be. The LM datassheet is designed to work in cooperation. Black level clamping of the signal is carried out directly on. Block and Connection Diagram.
All voltages are measured with respect to GND, unless otherwise specified. Human body model, pF discharged through a 1. A pF cap is charged to the specified voltage, then discharged directly into the. Load resistors are not required and are not used in the test circuit, therefore all.
Linearity Error is the variation in step height of a 16 step staircase input signal waveform with 0. Input from signal generator: Scope and generator response used for testing: Using the RSS technique the scope and.
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It is the difference in. This yields a typical gain change of. ABL should provide smooth decrease in gain over the operational range of 0 dB to —6 lm1269nx. Measure output levels of the other two undriven amplifiers relative to the driven amplifier to determine channel separation.
Terminate the undriven amplifier. A minimum pulse width of ns is guaranteed for a horizontal line of 15 kHz. This limit is guaranteed by design. If a lower line rate is used ratasheet a longer. The video black lm1269a is used for this test. Limits met by matching the external resistor going to pin 24 to the H Flyback voltage. All functions of the LM are controlled through the I 2 C. Details on the internal registers are covered in the.
I 2 C Interface Registers Section. Figure 1 shows the datasheeg. The I 2 C signals come in on pins. The video and OSD blocks. Proper operation of the LM does require a very. This voltage is generated in. To insure an accurate voltage over tem.
The external resistor is connected to pin. This pin has a very. The board layout shown in Datasheeet. This pin allows capacitor. A buffer must be used with this reference, the. Any noise dataasheet into pin 21 will appear on the video. The video inputs are pins 5, 6, and 7. Looking at the red. Since the video must be AC coupled to. With such a high impedance the DC restoration can appear. The output of the Buffer Amp goes to the Contrast stage.
This register controls the Contrast stage in each. All ones will give no attenuation. The output of this. This is a voltage controlled gain stage which gives no. ABL is covered in more detail later in.
The OSD signal is. Bits 3 and 4 of register 08h. Maximum video level for the OSD window lm1269a. Minimum video level will occur with. This stage provides the drive needed for the inputs of a CRT. The recommended driver for this pre-amp is one of. Horizontal blanking is also added to the. This block is covered. Bits 0 through 2 in register 08 control. This gives 8 different black levels ranging from.
The Auto Beam Limit control reduces the gain of the. The ABL acts on all three channels. This is required for CRT life and X-ray. The beam current limit circuit application is as. EHT supply, current flows from the supply rail through the.
When current is drawn from the EHT supply, some of the. When the EHT current is high enough, the current flowing. V S is the external supply usually the CRT driver supply rail. A feedback loop is thus. The IC is I 2 C compatible, and allows control of all the pa- rameters necessary to directly setup and adjust the gain datashet contrast in the CRT display. Black level clamping of the signal is carried out directly on the AC coupled input signal into the datwsheet impedance pream- plifier input, thus dtaasheet the need for additional black level clamp capacitors.
Load resistors are not required and are dxtasheet used in the test circuit, therefore all the supply current llm1269na used by the pre-amp. Using the RSS technique the scope and generator response have been removed from the output rise and fall times. This yields a typical gain change of Terminate the undriven amplifier inputs to simulate generator loading. If a lower line rate is used then a longer clamp pulse may be required.
Figure 1 shows the block diagram of the LM The video and OSD blocks are shown for the red channel in Figure 1.
Dztasheet blocks for both the green and blue channels datasheft not shown; how- ever, they are identical to the red channel. Proper operation of the LM does require a very accurate reference voltage. This voltage is generated in the V Ref block. To insure an accurate voltage over tem- perature, an external resistor is used to set the current in the V Ref stage.
The external resistor is connected to pin This pin has a very high input impedance and will pick up any high frequency signals routed near it. The board layout shown in Figure 10 is a good example of trace routing near pin The output of the V Ref stage goes to a number of blocks in the video section and also to pin This pin allows capacitor filtering on the V Eatasheet output and offers an accurate external reference.
The voltage reference must be kept very clean for best performance of the LM Since the video must be AC coupled to the LM, the coupling cap is also used to store the reference voltage for DC restoration. With such a high impedance the DC restoration can appear to be working for a number of minutes after the clamp datzsheet is removed. The 7 bit contrast register 03h sets the contrast level through the I 2 C bus. This register controls the Contrast stage in each video channel.
The output of this lm1269ha is used as the feedback for the DC restoration loop. ABL is covered in more detail later in this section. The OSD signal is mixed with the video signal at the output of this stage.
Maximum video level for the OSD window occurs with both bits set to one. Minimum video level will occur with dwtasheet bits set to a zero.
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Each video channel has its own independent control of this block so the user can balance the color of the CRT display. Registers 00h, 01h, 02h are used for the gain attenuation. This stage provides the drive needed for the inputs of a CRT datasheet. The recommended driver for this pre-amp is one of the LMX family.