MAX9598 pdf datasheet

MAX9598双SCART矩阵开关能够在I²C接口控制下实现机顶盒解码芯片和两个外部SCART控制器之间的音频、视频信号切换。MAX9598工作在3.3V和12V电源，以典型信号驱动典型负载时，静态功耗为70mW，平均功耗为471mW。视频输入检测、视频负载检测以及1.7mW低功耗模式非常适合低功耗机顶盒设计。

MAX9598的音频电路提供音频输入至音频输出的交叉切换，并具有缓冲功能。DirectDrive™输出放大器产生一个以地为参考的2V_RMS满幅音频信号，无需大体积输出电容，并降低了咔嗒声。过零检测电路仅在过零时切换音频信号，从而进一步降低咔嗒声。

MAX9598视频电路提供视频输入至视频输出的交叉切换，并具有缓冲功能。来自机顶盒解码芯片的标清视频信号经过低通滤波后可以消除带外杂波。

MAX9598还支持低速和快速信号切换，MAX9598输出中断信号可以通知微控制器(µC)系统状态的改变。

MAX9598采用紧凑的40引脚、薄型QFN封装，工作在0°C至+70°C商业级温度范围。

The MAX9598 dual SCART matrix routes audio and video
signals between a set-top box decoder chip and two
external SCART connectors under I2C control. Operating
from a 3.3V supply and a 12V supply, the MAX9598 consumes
70mW during quiescent operation and 471mW
during average operation when driving typical signals into
typical loads. Video input detection, video load detection,
and a 1.7mW low-power mode facilitate the design of lowpower
set-top boxes.
The MAX9598 audio section contains a buffered crosspoint
to route audio inputs to audio outputs. The
DirectDrive™ output amplifiers create a 2VRMS fullscale
audio signal biased around ground, eliminating
the need for bulky output capacitors and reducing
click-and-pop noise. The zero-cross detection circuitry
also further reduces clicks and pops by enabling audio
sources to switch only during a zero-crossing.
The MAX9598 video section contains a buffered crosspoint
to route video inputs to video outputs. The standarddefinition
video signals from the set-top box decoder chip
are lowpass filtered to remove out-of-bandwidth artifacts.
The MAX9598 also supports slow-switching and fast-switching
signals. An interrupt signal from the MAX9598 informs the
microcontroller (μC) when the system status has changed.
The MAX9598 is available in a compact 40-pin thin QFN
package and is specified over the 0°C to +70°C commercial
temperature range.