1.3.2 Input Signals:
1.3.2.1 Video Signal Amplitudes:
The video inputs consist of Red, Green and Blue
signals each has its own coaxial cable terminated
at the monitor. These video signals are analog
levels, where 0V corresponds to black, and
700mV is the maximum signal amplitude for the
respective color. The video signal is terminated
with 75 ohms.
1.3.2.2 Video Signal Termination Impedance:
The analog video signal termination shall be 75
ohm +/- 2%.
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 according to 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 according to 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 were
designed with 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, absence of sync,
abnormal input signal amplitude, or any other
anomalous behavior of a graphics card.
1.
(continued)
Product Specification
1.3.3.3 On-Screen Display:
On Screen Display system shall be used to
control the monitor. Current setting will be saved
and OSD will be tuned off when the keys are not
touched for a period of time. (Please see OSD
timeout section)
A) Key Function Overview: All functions are
controlled by OSD buttons on the front cover.
Press the function button to open the shortcut
menu. The shortcut menu lets you quickly select
the most commonly accessed settings.
1.3.2.7 Digital TMDS Input (DVI and HDMI signal input):
These video inputs consist of TX0+/- to TX2+/-±
and CLK+/- signals, each with its own shielded
twisted pair. These video signals are digital levels.
Each signal pair is terminated by a normal 100
ohms.
1.3.2.8 Audio Function (optional):
This monitor integrated with stereo audio.
Speakers: 2 x 1W
Amplifier: Output 1W with 500mVrms Sine wave
input.
Input impedance: >22K Ohms.
THD: <10%.
1.3.3 User Controls and Indicators:
1.3.3.1 Power On/Off Switch:
The monitor shall have a power control switch
visible and accessible on the side of monitor.
1.3.3.2 Power Indicator LED:
The monitor shall have LED indicators located on
the front of the monitor. Table 1 is the LED color
for the power indicator.
B) Menu Operation:
Pressing the MENU button brings up the first level
menu. This menu button is used to enter the
second OSD menu also.
LED Color
Power-ON Mode:
Blue
Power Saving Mode:
Amber
Shortcut menu
Content
OSD Display
Input change function
Use Input key to select from different video
sources that may be connected to your monitor.
Speaker Volume
control function
Press this button to activate the Volume menu.
OSD Function
Press this button to activate the OSD menu.
Auto Adjust Function
Press this button to activate the Auto Adjustment
function. The Auto Adjustment function is used
to set the HPos, VPos, Clock and Focus.
Empowering
Press the Empowering Key to open the Acer
eColor Management OSD and access the
scenario modes.
4
ACER A211H/A221HQ
