With high-definition image quality compatible 6-bit VCA circuit/LPF switching circuit/FLAG circuit integrated
I 2C Bus Control Video Switch IC
MM1793XQ
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Announced on February 7, 2008 |
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■Overview
With the start of the digital terrestrial broadcasting, we feel the pictures of high-definition quality familiar to ourselves. Together with the advent of the digital terrestrial broadcasting, the FPD is becoming more popular and its price has become reasonable for the consumers. FPD-TVs have beefed up with the additional functions to allow the connection of a variety of external equipment. Against these backgrounds, solutions to implement multiple inputs and multiple functions in one chip have to be developed for the video switches that input the image of high-definition quality.
This product can support the video signal format of 1080p that is required to input the signal of high-definition image quality. In addition, it has the multiple-function circuit that are composed of 8-bit VCA, LPF switching and FLAG circuits, and this circuit can implement simple development design and the savings in the space for packaging footprint.
§ Features
1. | Integrates the 8-bit VCA circuit that can tune variations between tuners |
2. | Integrates the function to monitor the connection of the external input (FLAG function) to lower the load of the microcomputer. |
3. | Selectable one of three LPF cutoff frequencies so that the selected frequency can be compatible with the resolution and sampling frequency.
(fc[=6.75MHz, 13.5MHz, or 37.5MHz]) |
§ Main specifications
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Input |
V (6 lines), S (4 lines), D (3 lines), and Audio (8 lines) |
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Output |
Main (1080p[100MHz]), Sub(1080i[50MHz]), Monitor,
and Audio(3 lines) |
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Consumption current |
(Vcc9) : 36mA min. 60mA typ. 84mA max.
(Vcc5) : 60mA min. 100mA typ. 140mA max.,
(Vcc9 PS=ON) : 5mA min. 10mA typ. 15mA max.
(Vcc5 PS=ON) : 30mA min. 50mA typ. 70mA max. |
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Frequency
characteristics |
(Main)[100MHz/100kHz] : -3.0dB min. -1.0dB typ. 1.0dB max.
(Main/LPF1)[6.75MHz/100kHz] : -3.0dB min. -1.0dB typ. 1.0dB max.
(Main/LPF1)[27MHz/100kHz] : -55.0dB typ. -50.0dB max.
(Main/LPF2)[13.5MHz/100kHz] : -3.0dB min. -1.0dB typ. 1.0dB max.
(Main/LPF2)[54MHz/100kHz] : -55.0dB typ. -50.0dB max.
(Main/LPF3)[37.5MHz/100kHz] : -3.0dB min. -1.0dB typ. 1.0dB max.
(Main/LPF3)[100MHz/100kHz] : -35.0dB typ. -25.0dB max.
(Sub)[50MHz/100kHz] : -3.0dB min. -1.0dB typ. 0dB max. |
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VCA maximum
voltage gain |
1.4V min. 1.75V typ. 2.1V max. |
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VCA minimum
voltage gain |
0.4V min. 0.5V typ. 0.6V max. |
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VCA level
adjustment sensitivity |
0mV/bit min. 4.9mV/bit typ. 9.8mV/bit max. |
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VCA
linearity error |
-1.5LSB min. 1.5LSB max. |
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Package |
QFP-100 (0.65mm pitch) |
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External dimensions |
23.2Χ17.2Χ3.22mm (including terminals) |
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