MAX9511 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – Complete VGA Interface with EMI Suppression

19-3669; Rev 0; 4/05
Complete VGA Interface with
EMI Suppression
General Description
The MAX9511 is a complete solution to interface a
video graphics controller to a VGA port and/or docking
station with optimal video performance and minimal
electromagnetic interference (EMI) emission. The
MAX9511 has output drivers with variable EMI suppres-
sion for graphics video and sync (RGBHV) signals. The
MAX9511 includes external load-detection circuitry.
The MAX9511 suppresses EMI emissions by limiting
the slew rate (SR) rather than limiting bandwidth with
fixed L-C filters. The SR controls the large-signal band-
width without affecting the small-signal bandwidth,
resulting in sharper video images, while reducing EMI.
The SR of the MAX9511 provides tighter control than
traditional passive L-C components, and allows the SR
to track the resolution by varying an external resistor
(R_RX) rather than being fixed to a sub-optimal value.
The load-detection circuitry of the MAX9511 automatically
detects and transmits a change in load status to the input
stages when an external load (monitor, docking station, or
projector) is connected. The MAX9511 is compatible with
the load-detection circuitry on the digital-to-analog (DAC)
outputs of most video graphics controllers. The output
drivers provide 6dB of gain to compensate for the 75Ω
back-termination resistors, which reduce transmission line
reflections.
The RGBHV channels can be placed into shutdown to
reduce power when no external load is connected.
The MAX9511 operates from 3V and 5V supplies. The
DDC circuitry performs bidirectional level translation
from 3V to 5V logic levels. The MAX9511 is offered in a
24-pin QSOP package and is specified over the com-
mercial 0°C to +70°C temperature range.
Applications
Notebook PCs (Laptops)
Docking Stations
Graphics Cards for Notebooks and Personal
Computers
Personal Computer Motherboards with On-Board
Video Graphics Controllers
Workstations
Features
o RGB Drivers with Adjustable Slew Rate for EMI
Control
o H Sync and V Sync Drivers with Level Translation
o Bidirectional Level Translators for DDC Support
o Simultaneously Drives External Monitor/Projector
and Docking Station without Analog RGB
Switches—No Stub Reflections
o Eliminates Up to 34 External Components
o Small 24-Pin QSOP Package
Ordering Information
PART
MAX9511CEG
TEMP RANGE
0°C to +70°C
PIN-
PACKAGE
24 QSOP
PKG
CODE
E24-2
Pin Configuration
TOP VIEW
V_CC 1
GREEN_IN 2
AGND 3
RED_IN 4
BLUE_IN 5
RX 6
SHDN 7
DDC_DATA_IN 8
DDC_CLK_IN 9
H_SYNC_IN 10
V_SYNC_IN 11
V_DD2 12
MAX9511
QSOP
24 AGND
23 GREEN_OUT
22 AGND
21 RED_OUT
20 AGND
19 BLUE_OUT
18 DGND
17 DDC_DATA_OUT
16 DDC_CLK_OUT
15 H_SYNC_OUT
14 V_SYNC_OUT
13 V_DD1
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