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參數(shù)資料
| 型號： | MAX9511_07 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | RGBHV Driver with EMI Suppression |
| 中文描述： | RGBHV的驅動器，帶有EMI抑制 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 394K |
| 代理商： | MAX9511_07 |
M
RGBHV Driver with EMI Suppression
10
______________________________________________________________________________________
Vertical and Horizontal SYNC
The MAX9511 has separate, noninverting, vertical and
horizontal sync buffers. Both sync inputs can level-shift
an input as low as 2.3V to a 5V output. Both sync drivers
have hysteresis at their input to prevent “chatter” in their
outputs. The sync output drivers have a 55
(typ) out-
put impedance (R
SO
) to match the cable impedance
used for vertical and horizontal sync in most applica-
tions. Both sync inputs are pulled to DGND through a
47k
resistor if the controller’s SYNC source goes high
impedance, or if the inputs are left floating, avoiding
ambiguous output conditions.
EMI can result from rapid transitions of the sync or the
video signals. To reduce the rise and fall times of the
sync signal, additional capacitance may be added to
the sync outputs. Adding additional capacitance may
require “recentering” the display.
Display Data Channel (DDC)
The MAX9511 bidirectional display data channel (DDC)
level translator allows for a lower voltage video controller
logic to operate with a higher voltage external monitor
logic. Power supplied at V
DD2
defines the DDC input
voltage thresholds while power supplied at V
DD1
defines
the DDC output thresholds. Two Schottky-clamped npn
transistors shift the lower level DDC inputs to higher
logic-level outputs.
DDC_CLK_OUT and DDC_DATA_OUT are pulled to
V
DD1
by internal pullup resistors to prevent ambiguous
conditions when left floating. At shutdown, DDC inputs
can still respond to external commands.
Slew-Rate Limiting
The MAX9511 outputs are slew-rate limited to reduce
EMI. Slew-rate limiting affects the large-signal bandwidth
(LSBW) more than the small-signal bandwidth (SSBW),
and can be scaled according to the following formula:
where V
OUT
is the output signal’s peak-to-peak voltage
and LSBW(-3dB) is the -3dB bandwidth.
The slew rate of the MAX9511 is controlled by a resistor
between RX and AGND. The resistor (R
RX
) can be var-
ied to optimize the EMI suppression to the display reso-
lution while preserving the display quality. The R
RX
range is approximately 7k
for maximum slew rate and
50k
for minimum slew rate (see Figure 3). Slew-rate
limiting can be approximated by:
Shutdown
The MAX9511 features a low-power shutdown mode for
battery-powered/portable applications. Shutdown
reduces the quiescent current of the video and sync dri-
vers. Connecting
SHDN
to ground (DGND) disables the
outputs and places the MAX9511 into a low-power shut-
down mode.
SHDN
has a 330k
(typ) internal pulldown
resistor to DGND. Connect
SHDN
to V
DD2
for normal
operation.
Applications Information
Customizing Slew Rates for
Different Resolutions
When the MAX9511 connects to devices of different
resolutions, different slew rates should be used. The
slew rate of the MAX9511 is adjustable by varying R
RX
between 7k
and 50k
. By selecting a valid R
RX
value
for a resolution, the MAX9511 minimizes the EMI and
optimizes the video output quality. Shown are two con-
figurations to adjust slew rates using different R
RX
val-
ues for different video resolutions.
Figure 4 shows how to customize slew rates for three res-
olutions. This circuit provides three predetermined slew
rates by paralleling resistors to create three R
RX
values.
The combination is controlled by a digital command from
the video controller through a switch. This requires that
the sample clock rates used by different resolutions are
close. The sync bandwidth-limiting capacitors (C
SYNC
)
are set for the highest resolution.
( /
V
)
SR
R
s
=
1030
7000
RX
μ
(
)
LSBW
dB
3
R
V
=
×
×
2
S
OUT
π
SLEW RATE vs. R
RX
M
R
RX
(k
)
S
μ
s
40
30
10
20
200
400
600
800
1000
1200
1400
1600
0
0
50
Figure 3. Slew Rate vs. RRX
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9511CEG | 功能描述:視頻 IC RGBHV Driver w/EMI Suppression RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MAX9511CEG+ | 功能描述:視頻 IC RGBHV Driver w/EMI Suppression RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MAX9511CEG+T | 功能描述:視頻 IC RGBHV Driver w/EMI Suppression RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MAX9511CEG-T | 功能描述:視頻 IC RGBHV Driver w/EMI Suppression RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MAX9511EVKIT | 功能描述:視頻 IC MAX9511 EVAL KIT RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
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