MAX9511CEG+ Maxim Integrated Products, MAX9511CEG+ Datasheet - Page 9

• Manufacturer Part Number: MAX9511CEG+
• Description: IC INTERFACE VGA 24-QSOP
• Manufacturer: Maxim Integrated Products
• Type: RGBHV Driverr

Specifications of MAX9511CEG+

• Applications: Driver
• Number Of Circuits: 3
• Slew Rate: 1100 V/µs
• Current - Supply: 38mA
• Current - Output / Channel: 40mA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 24-QSOP
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Maximum Power Dissipation: 762 mW
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

resistor to the input. This results in an equivalent imped-
ance of 75Ω at the DAC output, which indicates to the
video controller’s internal load-detection circuit that the
load is disconnected and the video controller shuts down
the video output. Figure 2 and Table 1 demonstrate how
the MAX9511 load-detection circuit operates in conjunc-
tion with the video controller load detection.
The video signal at the MAX9511 output is shifted
upwards by approximately 240mV from the input to
keep the output stage of the video driver in a linear
region of operation. At the connector, the video signal
is attenuated by 6dB, canceling the 6dB gain of the
video driver. The 240mV level shift is also attenuated by
Figure 1. Conventional Load-Detection Scheme
Figure 2. Load-Detection Scheme with MAX9511
CURRENT DAC
Output Video Signal Level Shift
VIDEO CONTROLLER
I
OUT
_______________________________________________________________________________________
REF
RGBHV Driver with EMI Suppression
CURRENT DAC
VIDEO CONTROLLER
I
OUT
REF
R
37.5Ω
T
-75Ω
R
G = 2
ISENSE
R
75Ω
T
6dB, and hence the actual video signal seen by the
load is only 120mV higher than the video signal at the
input of the MAX9511. Monitors and other display
devices AC-couple the input signal so the 120mV level
shift should not affect the displayed video image.
Table 1. Function of Load-Detection
Scheme
Connected to External Load
Not Connected to External Load
FOR EMI SUPPRESSION
V
V
LOWPASS FILTER
AMPLIFIER OUTPUT
IS
Y
MAX9511
V
X
OUT
MONITOR
75Ω
R
75Ω
R
L
T
INTERNAL
MAX9511
SWITCH
Closed
Open
MONITOR
R
75Ω
L
RESISTANCE
OUTPUT
AT DAC
37.5Ω
75Ω
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