MAX9598雙SCART矩陣開(kāi)關(guān)能夠在I2C接口控制下實(shí)現(xiàn)機(jī)頂盒解碼芯片和兩個(gè)外部SCART控制器之間的音頻、視頻信號(hào)切換。MAX9598工作在3.3V和12V電源，以典型信號(hào)驅(qū)動(dòng)典型負(fù)載時(shí)，靜態(tài)功耗為70mW，平均功耗為471mW。視頻輸入檢測(cè)、視頻負(fù)載檢測(cè)以及1.7mW低功耗模式非常適合低功耗機(jī)頂盒設(shè)計(jì)。

MAX9598的音頻電路提供音頻輸入至音頻輸出的交叉切換，并具有緩沖功能。DirectDrive?輸出放大器產(chǎn)生一個(gè)以地為參考的2V_RMS滿幅音頻信號(hào)，無(wú)需大體積輸出電容，并降低了咔嗒聲。過(guò)零檢測(cè)電路僅在過(guò)零時(shí)切換音頻信號(hào)，從而進(jìn)一步降低咔嗒聲。

MAX9598視頻電路提供視頻輸入至視頻輸出的交叉切換，并具有緩沖功能。來(lái)自機(jī)頂盒解碼芯片的標(biāo)清視頻信號(hào)經(jīng)過(guò)低通濾波后可以消除帶外雜波。

MAX9598還支持低速和快速信號(hào)切換，MAX9598輸出中斷信號(hào)可以通知微控制器(μC)系統(tǒng)狀態(tài)的改變。

MAX9598采用緊湊的40引腳、薄型QFN封裝，工作在0°C至+70°C商業(yè)級(jí)溫度范圍。

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.