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参数资料
| 型号： | MAX9670CTL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/44页 |
| 文件大小： | 0K |
| 描述： | IC AUDIO/VIDEO SWIT DUAL 40TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 音频/视频切换 |
| 电路： | 2 x SCART |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 3.3 V ~ 12 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
| 配用： | MAX9670EVKIT+-ND - EVALUATION KIT FOR MAX9670 |
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MAX9670/MAX9671
Low-Power Audio/Video Switch with Audio
Volume Control for Dual SCART Connectors
______________________________________________________________________________________
25
Interfacing to an RF Modulator
If the set-top box modulates CVBS and mono audio
onto an RF carrier (for example, channel 3), a simple
application circuit can provide the needed signals (see
Figure 17). 10k
resistor summer circuit between
TV_OUTR and TV_OUTL creates the mono audio sig-
nal. The resistor-divider to ground on TV_Y/CVBS_OUT
creates a video signal with normal amplitude. The
unique feature of the MAX9670/MAX9671 that facilitates
this application circuit is that the audio and video out-
put amplifiers of the MAX9670/MAX9671 can drive mul-
tiple loads if VAUD and VVID are both greater than
3.135V.
Unconnected-Chassis Discharge
Protection and ESD
Some set-top boxes are not connected to earth ground.
As a result, the chassis can charge up to 500V. When a
SCART cable is connected to the SCART connector,
the charged chassis can discharge through a signal
pin. The equivalent circuit is a 2200pF capacitor
charged to 311V connected through less than 0.1
to a
signal pin. The MAX9670/MAX9671 are soldered on the
PCB when it experiences such a discharge. Therefore,
the current spike flows through both external and inter-
nal ESD protection devices and is absorbed by the
supply bypass capacitors, which have high capaci-
tance and low ESR.
To better protect the MAX9670/MAX9671 against
excess voltages during the cable discharge condition
or ESD events, add series resistors to all inputs and
outputs to the SCART connector if series resistors are
not already present in the application circuit. Also, add
external ESD protection diodes (for example, BAV99)
on all inputs and outputs to the SCART connector.
SCART Set-Top Box
with Analog HD Outputs
In set-top boxes with SCART connectors and cinch
connectors for high-definition YPbPr outputs, a triple-
video DAC usually outputs either standard-definition
RGB signals that are routed to the MAX9670/MAX9671
or high-definition YPbPr signals that are routed through
a high-definition filter amplifier like the MAX9653 (see
Figure 19). The set-top box devices have a limited num-
ber of video DACs, and hence, one bank of triple-video
DACs switches video format depending upon whether
standard-definition RGB or high-definition YPbPr sig-
nals are required.
When RGB signals are desired, the high-definition filter
amplifier should be turned off so that the RGB signals
do not appear on the YPbPr connectors. The
MAX9653/MAX9654 are well-suited for this application
because their video inputs are in high-impedance
mode when in shutdown.
Figure 17. Application Circuit to Connect CVBS and Mono Audio from TV SCART to RF Modulator
TV
SCART
MAX9670/MAX9671
TV_OUTR
TV_OUTL
10k
10k
MONO AUDIO
TV_Y/CVBS_OUT
75
OR GREATER
75
OR GREATER
75
RF
MODULATOR
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9670EVKIT+ | 功能描述:交换机 IC 开发工具 Low-Power A/V Switch w/Audio Volume Cntrl RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:USB Power Switches 工具用于评估:MAX4984E 工作电源电压:2.8 V to 5.5 V |
| MAX9671CTH+ | 功能描述:视频开关 IC Low-Power A/V Switch w/Audio Volume Cntrl 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 |
| MAX9671CTH+T | 功能描述:视频开关 IC Low-Power A/V Switch w/Audio Volume Cntrl 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 |
| MAX9671EVKIT+ | 功能描述:交换机 IC 开发工具 Low-Power A/V Switch w/Audio Volume Cntrl RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:USB Power Switches 工具用于评估:MAX4984E 工作电源电压:2.8 V to 5.5 V |
| MAX9672ETI+ | 功能描述:LCD Gamma缓冲器 10-Bit Prog Gamma Reference System RoHS:否 制造商:Maxim Integrated 输入补偿电压: 转换速度: 电源电压-最大:20 V 电源电压-最小:9 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-38 封装:Tube |
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