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845GL bảng dữ liệu(PDF) 153 Page - Intel Corporation

tên linh kiện 845GL
Giải thích chi tiết về linh kiện  Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
PDF  193 Pages
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nhà sản xuất  INTEL [Intel Corporation]
Trang chủ  http://www.intel.com
Logo INTEL - Intel Corporation

845GL bảng dữ liệu(HTML) 153 Page - Intel Corporation

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Intel® 82845G/82845GL/82845GV GMCH Datasheet
153
Electrical Characteristics
6.6
DAC Characteristics
The GMCH DAC (digital-to-analog converter) consists of three identical 8-bit DACs to provide
red, green, and blue color components. Each DAC can output a current from 0 to 255 units of
current, where one unit of current (LSB) is defined based on the VESA video signal standard.
6.6.1
DAC DC Characteristics
NOTES:
1. Measured at each R,G,B termination according to the VESA Test Procedure – Evaluation of Analog Display
Graphics Subsystems Proposal (Version 1, Draft 4, December 1, 2000)
2. Max steady-state amplitude
3. Min steady-state amplitude
4. Defined for a double 75
Ω termination
5. Set by external reference resistor value
6. INL and DNL measured & calculated according to VESA Video Signal Standards
7. Max full-scale voltage difference among R,G,B outputs (percentage of steady-state full-scale voltage)
Figure 6-1. System Bus HCLKP/N VCROSS Range
VHigh Average (mV) (Measured)
Vcross(rel) Max = 0.5 (Vhavg - 0.710) + .550
Vcross(rel) Min = 0.5 (Vhavg - 0.710) + .250
550
500
450
400
350
300
250
625
650
675
700
725
750
775
800
200
825
850
Vcross(rel) Max
Vcross(rel) Min
Vcross Range
For VHigh < 0.71V
Vcross Range
For VHigh > 0.71V
Table 6-7. DAC DC Characteristics: Functional Operating Range (VCCDAC = 1.5 V
±5%)
Parameter
Min
Typical
Max
Units
Notes
DAC Resolution
8
Bits
Note 1
Max Luminance (full-scale)
0.665
0.700
0.770
V
Notes 1, 2, 4, white video level
voltage
Min Luminance
0.000
V
Notes 1, 3, 4, black video level
voltage
LSB Current
73.2
µA
Notes 4, 5
Integral Linearity (INL)
–1.0
+1.0
LSB
Notes 1, 6
Differential Linearity (DNL)
–1.0
+1.0
LSB
Notes 1, 6
Video channel-channel voltage
amplitude mismatch
6%
Notes 7
Monotonicity
Guaranteed



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