参数资料
| 型号： | MAX9511CEG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/15页 |
| 文件大小： | 0K |
| 描述： | IC INTERFACE VGA 24-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 应用： | 驱动器 |
| 电路数： | 3 |
| 转换速率： | 1100 V/µs |
| 电流 - 电源： | 38mA |
| 电流 - 输出 / 通道： | 40mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 标准包装 |
| 产品目录页面： | 1424 (CN2011-ZH PDF) |
| 其它名称： | MAX9511CEG+TDKR |
MAX9511
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 (RSO) 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 VDD2 defines the DDC input
voltage thresholds while power supplied at VDD1 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
VDD1 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 VOUT 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 (RRX) can be var-
ied to optimize the EMI suppression to the display reso-
lution while preserving the display quality. The RRX
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 VDD2 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 RRX
between 7k and 50k. By selecting a valid RRX 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 RRX 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 RRX 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 (CSYNC)
are set for the highest resolution.
(/
)
SR
R
Vs
=
1030
7000
RX
()
LSBW
dB
R
V
=
××
3
2
S
OUT
π
SLEW RATE vs. RRX
MAX9511
fig03
RRX (k)
SLEW
RATE
(V/
s)
40
30
10
20
200
400
600
800
1000
1200
1400
1600
0
050
Figure 3. Slew Rate vs. RRX
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9511EVKIT | 功能描述:视频 IC MAX9511 EVAL KIT RoHS:否 制造商:Fairchild Semiconductor 工作电源电压:5 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-28 封装:Reel |
| MAX9512AEE+ | 制造商:Maxim Integrated Products 功能描述:VID AMP QUAD 3.6V - Rail/Tube |
| MAX9512AEE+T | 制造商:Maxim Integrated Products 功能描述:VID AMP QUAD 3.6V 16QSOP - Tape and Reel |
| MAX9512ATE+ | 功能描述:视频放大器 Video Filter Amp RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| MAX9512ATE+T | 功能描述:视频放大器 Video Filter Amp RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
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