- 您现在的位置：买卖IC网 > PDF目录11165 > MAX9656AEP+ (Maxim Integrated Products)IC VIDEO SWIT DUAL SCART 20QSOP PDF资料下载
参数资料
| 型号： | MAX9656AEP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/17页 |
| 文件大小： | 0K |
| 描述： | IC VIDEO SWIT DUAL SCART 20QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 功能： | 视频开关 |
| 电路： | 2 x SCART |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 3.6 V |
| 电流 - 电源： | 21mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 20-QSOP |
| 包装： | 管件 |
MAX9655/MAX9656
Low-Power Video Switches
for Dual SCART Connectors
_______________________________________________________________________________________
9
When the MAX9656 is in shutdown, its inputs are
biased at the same voltage and present the same input
resistance as unselected inputs.
Video Filter
The MAX9655/MAX9656 video filter features ±1dB
passband out to 9.5MHz and 47dB attenuation at
27MHz, making the filter suitable for standard-definition
video signals from all sources (e.g., broadcast and
DVD). Broadcast video signals are channel limited:
NTSC signals have 4.2MHz bandwidth, and PAL sig-
nals have 5MHz bandwidth. Video signals from a DVD
player, however, are not channel limited; so the band-
width of DVD video signals can approach the Nyquist
limit of 6.75MHz. Recommendation: ITU-R BT.601-5
specifies 13.5MHz as the sampling rate for standard-
definition video. Therefore, the maximum bandwidth of
the signal is 6.75MHz. To ease the filtering require-
ments, most modern video systems oversample by two
times, clocking the video current DAC at 27MHz.
Outputs
The video output amplifiers can both source and sink
load current, allowing output loads to be DC- or AC-
coupled. The amplifier output stage needs approxi-
mately 300mV of headroom from either supply rail. The
devices have an internal level-shift circuit that positions
the sync tip at approximately 300mV at the output.
If the supply voltage is greater than 3.135V (5% below
a 3.3V supply), each amplifier can drive two DC-cou-
pled video loads to ground. If the supply is less than
3.135V, each amplifier can drive only one DC-coupled
or AC-coupled video load.
Applications Information
Audio Switch for Dual SCART Connectors
In addition to video signals, SCART connectors also
support left and right audio signals that are full duplex.
Figure 1 shows a matching audio switch for the
MAX9655. Notice that it can be made from low-cost,
discrete components. It is assumed that the set-top box
chip generates the left and right audio signals directly,
or the set-top box chip sends an I2S stream to a stereo
audio DAC that generates the left and right audio sig-
nals. In both cases, the audio signals are filtered and
amplified by a dual audio op amp before they are pre-
sented to the audio switch.
Figure 2 shows a matching audio switch for the
MAX9656. Similar to how the MAX9656 handles video
signals, the audio signals from the set-top box chip or
the audio signals from the TV SCART are routed to the
VCR SCART.
AC-Coupling the Outputs
The outputs can be AC-coupled since the output stage
can source and sink current as shown in Figure 3.
Coupling capacitors should be 220F or greater to
keep the highpass filter, formed by the 150
Ω equivalent
resistance of the video transmission line, to a corner
frequency of 4.8Hz or below. The frame rate of PAL
systems is 25Hz. The corner frequency should be well
below the frame rate.
INPUT
INPUT CIRCUIT
(TV_SEL = LOW)
INPUT CIRCUIT
(TV_SEL = HIGH)
ENC_B_IN
Sync-tip clamp
Bias
ENC_G_IN
Sync-tip clamp
Bias
ENC_R_IN
Sync-tip clamp
Bias
ENC_CVBS_IN
Sync-tip clamp
(VCR_SEL = 0)
Sync-tip clamp (VCR_SEL = 1)
Sync-tip clamp (VCR_SEL = 0)
Bias
(VCR_SEL = 1)
TV_CVBS_IN
Bias
(VCR_SEL = 0)
Sync-tip clamp
(VCR_SEL = 1)
Bias
(VCR_SEL = 0)
Sync-tip clamp
(VCR_SEL = 1)
VCR_B_IN
Bias
Sync-tip clamp
VCR_G_IN
Bias
Sync-tip clamp
VCR_R_IN
Bias
Sync-tip clamp
VCR_CVBS_IN
Bias
Sync-tip clamp
Table 5. MAX9656 Input Circuit of Input as Determined by State of TV_SEL
Note: VCR_SEL = X (don’t care), except where noted.
相关PDF资料 |
PDF描述 |
|---|---|
| VE-B4M-CU-B1 | CONVERTER MOD DC/DC 10V 200W |
| VE-B4K-CU-B1 | CONVERTER MOD DC/DC 40V 200W |
| VE-B62-IX-F3 | CONVERTER MOD DC/DC 15V 75W |
| VE-B62-IX-F2 | CONVERTER MOD DC/DC 15V 75W |
| C8051F715-GQ | IC 8051 MCU 8K FLASH 48-TQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9656AEP+ | 功能描述:视频开关 IC Video Switch f/Dual SCART Connector RoHS:否 制造商:Texas Instruments 开关数量:4 开启电阻（最大值）:12 Ohms 传播延迟时间: 开启时间（最大值）: 关闭时间（最大值）: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:WQFN-42 封装:Reel |
| MAX9656AEP+T | 功能描述:视频开关 IC Video Switch f/Dual SCART Connector RoHS:否 制造商:Texas Instruments 开关数量:4 开启电阻（最大值）:12 Ohms 传播延迟时间: 开启时间（最大值）: 关闭时间（最大值）: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:WQFN-42 封装:Reel |
| MAX9656EVKIT+ | 功能描述:视频 IC 开发工具 MAX9656 Eval Kit RoHS:否 制造商:Texas Instruments 产品:Evaluation Boards 类型:YPbPr to RGBHV Converters 工具用于评估:LMH1251 工作电源电压:5 V |
| MAX9657AEE+ | 功能描述:视频放大器 Quad 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 |
| MAX9657AEE+T | 功能描述:视频放大器 Quad 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 |
发布紧急采购，3分钟左右您将得到回复。