1. Product Specification (continued)
1.3.1.3 Audio Jack (option)
This jack shall connect the audio input from
host computer.
1.3.2 Video Input Signals
D -S U B P in D e s c rip tio n
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.
2
G r e e n - V id e o
G r e e n v id e o s ig n a l in p u t.
3
B lu e - V id e o
B lu e v id e o s ig n a l in p u t.
4
G N D
G r o u n d
5
D D C - G N D
D D C g r o 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 r o 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 r o u n d fo r th e G r e e n v id e o .
8
B lu e - G N D
A n a lo g s ig n a l g r o u n d fo r th e B lu e v id e o .
9
+ 5 V
+ 5 V in p u t fr o 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
1 1
G N D
G r o u n d
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 fr o m th e h o s t s y s te m .
1 4
V - S Y N C
V e r tic a l s ig n a l in p u t fr o 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 .
C o n n e c to r P in D e s c r ip tio n
1.3.2.1 Video 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.
1.3.2.2 Video Signal Termination Impedance
This analog video signal termination shall be 75
1% which shall be resistive with a negligible reactive
component.
1.3.2.3 Synchronization ( 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 .
1.3.2.4 Sync 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 .
1.3.2.5 Sync 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 .
1.3.2.6 Abnormal 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 .
Ω
NO. Symbol
Item
Min Normal Max Unit
Remark
1
Fh
Scanning Horizon
tal 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) Schmitt
-Triggers Input , Supported 3.3V device H ( & V) sync output from PC
3
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ACER H233H
