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参数资料
| 型号： | MAX9670CTL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/44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
22
______________________________________________________________________________________
The audio path has a gain of 4V/V so that the full scale
of the audio output signal is 2VRMS. If less than 2VRMS,
full scale is desired at the audio outputs, and the full
scale of the audio input signal should be proportionate-
ly decreased below 0.5VRMS.
Operating Modes
The MAX9670/MAX9671 has four operating modes,
which can be set by writing to bits 6 and 7 of register
10h. See Table 19.
Shutdown
All circuitry is shutdown in the MAX9670/MAX9671
except for the I2C interface, which is designed with sta-
tic CMOS logic. Except for register 10h, which sets the
operating mode, the values in all of the other I2C regis-
ters are preserved while entering, during, and leaving
shutdown mode.
Standby Mode
In standby mode, the MAX9670/MAX9671 monitor the
slow-switch signals and decide whether to loop through
the audio/video signals. If the VCR slow switch input
has activity (6V or 12V at the input), the audio/video sig-
nals are looped through from the VCR SCART to the TV
SCART. If the TV slow-switch input has activity, the
audio/video signals are looped through from the TV
SCART to the VCR SCART. If neither the VCR slow-
switch input nor the TV slow switch input show activity,
i.e., both inputs are at ground, no signals are looped
through. If both the VCR slow-switch input and the TV
slow-switch input have activity, the MAX9670/MAX9671
considers this condition to be illegal and does not loop
through any signals.
A finite state machine (Figure 14) controls the operation
of the MAX9670/MAX9671. State 0 is always the initial
state when the MAX9670/MAX9671 enter standby
mode. Table 4 shows the values of the I2C registers in
state 0. The state machine sets the other I2C registers
to the correct values to loop through the audio/video
signals in states 1 and 2 (see Tables 5 and 6). When
the MAX9670/MAX9671 leaves standby mode, the val-
ues in all of the I2C registers except register 10h are
preserved so that the operation is not disturbed. For
example, if in standby mode, the MAX9670 is looping
through the audio/video signals from VCR SCART to TV
SCART, and if the microcontroller changes the operat-
ing mode from standby mode to full-power mode, the
audio/video signals continue to be looped through dur-
ing and after the mode change. The user does not
experience any disruption in audio or video service.
The microcontroller can be turned off in standby mode
because the MAX9670/MAX9671 operate autonomous-
ly. Upon power-up, the default operating mode is
standby mode.
Full-Power Mode with Video Input Detection
and Video Load Detection
In this mode, the MAX9670/MAX9671 are fully on. If
interrupt is enabled, INT goes active low whenever the
slow-switch signal changes; a CVBS signal appears or
disappears; or a CVBS load appears or disappears.
The microcontroller can decide whether to change the
routing configuration or operating mode of the
MAX9670/MAX9671.
Full-Power Mode Without Video Input Detection
and Video Load Detection
This mode is similar to the above mode except that
video input detection and video load detection are not
active. If interrupt is enabled, INT goes active low only
when the slow-switch signal changes.
Power Consumption
The quiescent power consumption and average power
consumption of the MAX9670/MAX9671 are very low
because of 3.3V operation and low-power circuit design.
Quiescent power consumption is defined when the
MAX9670/MAX9671 are operating without loads and
without any audio or video signals. Table 7 shows the
quiescent power consumption in all 4 operating modes.
Average power consumption is defined when the MAX9670/
MAX9671 drives typical signals into typical loads. Table 8
shows the average power consumption in full-power
mode and Table 9 shows the input and output conditions.
MAX9670
1
F
6.65k
*R1 VALUES
DAC = CS4334/5/8/9: R1 = 4.53k
, 1%
DAC = PCM1742: R1 = 5.57k
, 1%
R1*
ENC_INL
1
F
6.65k
R1*
ENC_INR
STEREO
AUDIO
DACS
Figure 13. Application circuit to connect audio source to audio
inputs. The 1F capacitor connected to the ground-referenced
resistors biases the audio signal at ground. The resistors atten-
uate the audio signal.
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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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