ViewSonic Corporation
Confidential - Do Not Copy
Q9b-2
20
4. Circuit Description
A. A/D converters
The ADC is a 7-bit 4-channel analog-to digital converter ,the structure of these ADCS is 7-bit
successive approximation ,analog voltage is supplied from external sources to the A/D input pins and
the result of the conversion is stored In the 7-bit data latch registers(ADC0_REG~ADC3_REG).The
A/D cannels are activated by cleaning the correspondent control bits in the ADC_CON control register,
when users write”1” into one of the enable control bits(EN_ADC0~EN-ADC3),its correspondent I/O pin
will be switched to the A/D Converter input pin
The conversion will be started by setting STRT_ADC Bit, user can monitor this bit to get the valid A/D
channel, its latched data is meaningful, the analog voltage to be measured should be stable during the
conversion operation and the variation will not exceed 1 LSB for the best accuracy in measurement
B.Scalling controller
1. VGA front end
l
Built-in triple high speed ADC,PLL for analog RGB input
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Supports both non-interlaced and interlaced RGB graphic input signals
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Input signal ranges from 0.55-0.9v
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Provides RGB analog gain and offset control
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Support 64 steps (one cycle of pixel)of phase adjust
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ADC sampling rates are up to 110MHZ for x type, 160MHZ for E type Supports analog SOG
input
2. YUV Front End
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Support ITU-R BT.656 8-bit input
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Built-in YUV to RGB color space converter
3. Display
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Supports data swap to fit any panel data alignment for PCB Layout
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Built in LVDS transmitter
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Supports spectrum of output clock
4. Hot interface
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Support serial 2-wire IIC bus
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Provides 2 channel PMW
5. Power
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Power supply
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Less than 1.3W
Содержание Q9B-2 - Optiquest Q9b - 19" LCD Monitor
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