Video card upgrade. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Video card upgrade. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Computers

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Some modern PC graphics cards do not have a video input, although they do. The author of the published article talks about a similar refinement of the common AGP-V3800 board.

On some video cards based on NVIDIA chips (mainly well-known manufacturers) that do not have a video input, it is possible to install the SAA7113H chip with the appropriate "strapping" in the place provided for this on the board and thereby supplement the device with the missing function. Such cards include the AGP-V3800 PRO video adapter (with SGRAM video memory). This inexpensive board proved to be very "fast" and easy to use. Having equipped it with a video input, the user gets the opportunity to view video information from any signal sources in various windows on the monitor, including on top of already running programs, and record the video signal to the hard disk. Such a refinement is quite within the power of an average radio amateur who has some experience with surface mount components.

However, you should immediately warn that the entire risk of damaging or spoiling the card as a result of its improvement lies entirely with you.

First of all, you need to carefully examine the video card and analyze the possibility of installing the SAA7113H video input chip. Printed connections on the board must correspond or be close to the typical circuit for its inclusion (Fig. 1), proposed by the developer, Philips ( ). The fact is that many modern video cards are not designed to install a video input, and instead of it, the board is wired for a digital output for TFT monitors. Therefore, you should first make sure that there is a possibility to install a video input on the board. On fig. 7113: UDDD - supply voltage of "digital" nodes; UDDA - supply voltage of "analogue" units; Ussd - common wire of "digital" nodes; Ussa - common wire of "analogue" nodes.

(click to enlarge)

The SAA7113H decoder is a highly integrated analog-to-digital chip that converts analog signals of various color standards into CCIR-601-compatible color components. It is a 9-bit video input processor containing a two-channel analog pre-processor, an anti-aliasing filter, and an analog-to-digital converter. Further, the signal is processed by a digital multi-standard color decoder (NTSC-N, NTSC-M, NTSC-4.43, PAL-BGHI, PAL-N, PAL-4.43, PAL-M, SECAM) and a brightness, contrast and color saturation control unit. In addition, the chip includes a built-in multi-standard teletext decoder.

Chip features include four switchable analog inputs that allow you to switch up to four CVBS (composite video signals) or up to two Y / C (S-VIDEO) signals. To process all color standards, only one quartz resonator with a frequency of 24,576 MHz is used. The microcircuit is fully controlled by the I2C bus.

The SAA7113H is packaged in a QFP44 surface mount package. The soldering of the microcircuit is carried out with a micro-soldering iron, powered by a voltage of not more than 24 V, with a tip temperature not exceeding 300 °C. The tip of the soldering iron tip should not exceed the width of the microcircuit output (0,4 mm). The soldering time of one output is no more than 2 s. After 10 s of the total soldering time, a break should be taken to cool the microcircuit. In addition, all requirements for protection against static electricity must be observed.

Installation begins with careful positioning of the microcircuit in its mounting location. Lightly pressing the microcircuit to the board, first solder the extreme diagonal leads, and then all the rest.

The board is designed to accept size 0603 surface mount components, but size 0805 can also be used. The resistor and capacitor values are shown below. In parentheses are the corresponding reference designations on the AGP-V3800 PRO board: C4, C5 (C38, C45) - 0,047 uF; C11, C12 (C46, C47) - 27 pF; C1-C3, C13-C16 (capacitors in power circuits) - 0,1 uF; (ST8) - tantalum capacitor for surface mounting with a capacity of 33 microfarads for a voltage of 6,3 V, size B; R1, R3 (R121, R123) - 18 ohms; R2, R4 (R122, R124) - 56 Ohm; (R2) - 0 Ohm; RTS1 circuit (R125) - 2,2 kOhm; circuit RTS0 (R127) - 10 kOhm; (R128) - 47 Ohm; (L30, L33) - chokes for surface mounting, size 0805 - 0,01 μH; (L34) - inductor for surface mounting, size 0805 - 0,4 μH; ZQ1 (XZ) - quartz resonator 24,576 MHz.

An MDN-4 connector is installed in the provided place, and if there is a need to work with an external tuner, an MDN-7 connector is installed.

Figure 2 shows the appearance of the modified video card.

(click to enlarge)

After the installation of the microcircuit and all additional elements is completed and the video card is installed in the computer, you must reinstall the driver. Usually, after the self-test of the card via the I2C bus, the video input driver is installed automatically, since it is included in the video card driver. However, with some modern boards, video card and video input drivers are supplied separately. In this case, it will have to be installed manually.

The video input driver complies with the Microsoft Video for Windows standard and supports input window resolution up to 704x480 pixels (the maximum resolution depends on the driver version). It works with programs that support the input of video images and further processing of the video signal. The video card, when starting programs that support video input, self-tests via the I2C bus, and if a video input (SAA7113H chips) is detected, the program starts.

A video input assembly correctly assembled from serviceable parts does not require additional adjustment and starts working after installing programs that support video input, such as Digital VCR, etc. If a surveillance video camera is connected to the input, the computer will be able to perform security functions. There are special programs for this. I recommend for all tasks to use the latest versions of programs that support the processing of incoming signals in the SECAM system and have more functionality.

In terms of technical problems, it should be noted that the video input is very sensitive to the frequency of the built-in oscillator. If there are problems with color reproduction (especially in PAL mode), it is necessary to more accurately select the ZQ1 quartz resonator.

Author: V. Malysh, Primorsko-Akhtarsk, Krasnodar Territory

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