1. Product Specification (continued)
ACER H233H
3
C o n n e c to r P in D e s c r ip t io n
D - S U B | P in D e s c rip tio n |
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| |
P in |
| N a m e | D e s c rip tio n | |
1 |
| R e d - V id e o | R e d v id e o s ig n a l in p u t. |
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2 |
| G r e e n - V id e o | G re e n v id e o s ig n a l in p u t. |
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3 |
| B lu e - V id e o | B lu e v id e o s ig n a l in p u t. |
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4 |
| G N D | G ro u n d |
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5 |
| D D C - G N D | D D C g ro u n d fo r th e V E S A D D C 2 B i fu n c tio n . | |
6 |
| R e d - G N D | A n a lo g s ig n a l g ro u n d fo r th e R e d v id e o . | |
7 |
| G r e e n - G N D | A n a lo g s ig n a l g ro u n d fo r th e G re e n v id e o . | |
8 |
| B lu e - G N D | A n a lo g s ig n a l g ro u n d fo r th e B lu e v id e o . | |
9 |
| + 5 V | + 5 V in p u t fro m h o s t s y s te m fo r th e V E S A D D C 2 B i fu n c tio n . | |
1 0 |
| S y n c - G N D | S ig n a l g r o u n d |
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1 1 |
| G N D | G ro u n d |
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1 2 |
| D D C _ S D A | S D A s ig n a l in p u t fo r th e V E S A | D D C B 2 i fu n c tio n . |
1 3 |
| H - S Y N C | H o r izo n ta l s ig n a l in p u t fro m th e | h o s t s y s te m . |
1 4 |
| V - S Y N C | V e rtic a l s ig n a l in p u t fro m th e h o s t s y s te m . | |
1 5 |
| D D C - S C L | S C L s ig n a l in p u t fo r th e V E S A | D D C 2 B i fu n c tio n . |
1.3.1.3 Audio Jack (option)
This jack shall connect the audio input from host computer.
1.3.2 Video Input Signals
NO. | Symbol | Item | Min | Normal | Max | Unit | Remark |
1 | Fh | Scanning Horizontal Frequency | 31 |
| 94 | kHz | Minimum Range |
2 | Fv | Scanning Vertical Frequency | 50 |
| 75 | Hz | Minimum Range |
3 | Vih | Hi Level Input | 2 |
| 5 |
| Note 1) |
4 | Vil | Low Level Input | 0 |
| 0.8 | V | Note 1) |
5 | Video | RGB Analog Video Level | 0.0 | 0.7 | 1.0 | V | 75? to Ground |
Note1)
1.3.2.1Video Signal Amplitudes
The three video inputs consist of Red , Green , and Blue signals, each with its own coaxial cable terminated at the monitor. These video signals are analog levels, where 0 V corresponds to black , and 700 mV is the maximum signal amplitude for the respective color, when each signal is terminated by a nominal 75.0 ohms .For a given monitor luminance levels are measured using this defined video amplitude driving a monitor meeting the termination requirements . The signal amplitude is not to be readjusted to compensate for variations in termination impendence.
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1.3.2.2Video Signal Termination Impedance
This analog video signal termination shall be 75Ω
1% which shall be resistive with a negligible reactive component.
1.3.2.3Synchronization ( Sync ) Signals
The Horizontal Sync (HS) TTL signal is used to initiate the display of a horizontal line. HS may be either active high or active low, depending upon the timing .The Vertical Sync (VS) TTL signal is used to initiate the display of a new frame .VS may be either active high or active low, depending on the timing .
1.3.2.4Sync Signal Levels
The monitor must accept sync signals from both 3.3 and 5 volt TTL logic families.The inputs shall sense a logic 0 when the input is 0.8 volt or less and shall sense a logic 1 when the input is 2.0 volts or greater. In addition to these level requirements , there shall also be a minimum of 0.3 volt hysteresis provided for noise immunity (typically by using a Schmitt Trigger input ). That is , the input level at which the monitor actually detects a logic 0 shall be at least 0.3 volt lower than the level at which it actually detects a logic 1.If the monitor sync processing circuits are designed around the 3.3 volt logic family ,then the sync inputs must be 5 volt tolerant .
1.3.2.5Sync Signal Loading
TTL input loading shall be equivalent to one TTL input load. When logic 0 is asserted by a sync input , the maximum current source from any single monitor sync input to the driver is 1.6 mA .When logic 1 is asserted , the maximum current source from the driver to any single monitor sync input is 400 uA .
1.3.2.6Abnormal Signal Immunity
The monitor shall not be damaged by improper sync timing , pulse duration , or absence of sync , or abnormal input signal amplitude ( video and/ or sync too large or too small) , or any other anomalous behavior of a graphics card video generator when changing modes , or when any combination of input signals is removed or replaced . Additionally , under these conditions , the monitor shall not cause damage to the driving source .