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参数资料
| 型号： | MAX9597EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/32页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX9597 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | SCART 接口 |
| 已用 IC / 零件： | MAX9597 |
| 已供物品： | 板 |
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MAX9597
Low-Power Audio/Video Interface
for Single SCART Connectors
______________________________________________________________________________________
13
The full-scale output of the independent operational
amplifiers is 0.5VRMS. The closed-loop gain of the oper-
ational amplifier circuit should be designed such that
the resulting full-scale output is 0.5VRMS. The fixed,
gain-of-4 amplifiers that follow the independent opera-
tional amplifiers amplify the 0.5VRMS to 2VRMS, which
complies with the SCART standard.
An integrated charge pump inverts the +3.3V supply
(VAUD) to create a -3.3V supply (CPVSS), enabling the
audio circuit to operate from bipolar supplies. The
audio signal from the beginning to the end of the signal
path is always biased at ground.
Clickless Muting and Unmuting
The TV audio channel incorporates a zero-crossing
detect (ZCD) circuit that minimizes click noise due to
abrupt signal level changes that occur when entering
or coming out of a mute condition at an arbitrary
moment.
To implement the zero-crossing function when switch-
ing audio signals, set ZCD (register 00h, bit 6) high.
The MAX9597 switches the signal in or out of mute at
the next zero crossing after the mute or unmute request
occurs. See Table 8.
Audio Outputs
The MAX9597 audio output amplifiers feature Maxim’s
DirectDrive architecture, eliminating the need for output-
coupling capacitors required by conventional single-
supply audio line drivers. Conventional single-supply
audio line drivers have their outputs biased about a
nominal DC voltage (typically half the supply) for maxi-
mum dynamic range. Large coupling capacitors are
needed to block this DC bias. Clicks and pops are cre-
ated when the coupling capacitors are charged during
power-up and discharged during power-down.
An internal charge pump inverts the positive supply
(VAUD), creating a negative supply (CPVSS). The audio
output amplifiers operate from the bipolar supplies with
the outputs biased about audio ground (Figure 2). The
benefit of this audio ground bias is that the amplifier
outputs do not have a DC component. The DC-blocking
capacitors required with conventional audio line drivers
are unnecessary, conserving board space, reducing
system cost, and improving frequency response.
The MAX9597 features a low-noise charge pump that
requires only two small ceramic capacitors. The
580kHz switching frequency is well beyond the audio
range and does not interfere with audio signals. The
switch drivers feature a controlled switching speed that
minimizes noise generated by turn-on and turn-off tran-
sients. The di/dt noise caused by the parasitic bond
wire and trace inductance is minimized by limiting the
switching speed of the charge pump.
The SCART standard specifies 2VRMS as the full-scale
for audio signals. As the audio circuits process
0.5VRMS full-scale audio signals internal to the
MAX9597, the gain-of-4 output amplifiers restore the
audio signals to a full scale of 2VRMS.
Video Section
The video circuit routes different video formats between
the set-top box decoder and the TV SCART connector.
It also routes slow-switch and fast-switch control infor-
mation as shown in Figure 3.
Video Inputs
Whether the incoming video input signal is AC-coupled
or DC-coupled into the MAX9597 depends upon the ori-
gin, format, and voltage range of the video signal. Table
1 below shows the recommended connections. Always
AC-couple an external video signal through a 0.1F
capacitor because its voltage range is not well defined
(see the
Typical Application Circuit). For example, the
+VDD
-VDD
GND
VOUT
CONVENTIONAL DRIVER-BIASING SCHEME
DirectDrive BIASING SCHEME
VDD/2
VDD
GND
VOUT
Figure 2. Conventional Driver Output Waveform vs. MAX9597
Output Waveform
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9597EVKIT+ | 功能描述:视频 IC 开发工具 MAX9597 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 |
| MAX9598CTL+ | 功能描述:视频开关 IC A/V Switch for 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 |
| MAX9598CTL+T | 功能描述:视频开关 IC A/V Switch for 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 |
| MAX9598EVKIT+ | 功能描述:交换机 IC 开发工具 MAX9598 Eval Kit 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 |
| MAX9600EUP | 功能描述:校验器 IC Dual ECL-D/Q PECL 500ps Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
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