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MAX9598_09

Description
Low-Power Audio/Video Switch for Dual SCART Connectors
File Size550KB,36 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX9598_09 Overview

Low-Power Audio/Video Switch for Dual SCART Connectors

19-3209; Rev 1; 2/09
KIT
ATION
EVALU
BLE
AVAILA
Low-Power Audio/Video Switch for
Dual SCART Connectors
General Description
The MAX9598 dual SCART matrix routes audio and video
signals between a set-top box decoder chip and two
external SCART connectors under I
2
C control. Operating
from a 3.3V supply and a 12V supply, the MAX9598 con-
sumes 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 low-
power set-top boxes.
The MAX9598 audio section contains a buffered cross-
point to route audio inputs to audio outputs. The
DirectDrive
®
output amplifiers create a 2V
RMS
full-scale
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 cross-
point to route video inputs to video outputs. The standard-
definition 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-switch-
ing 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 commer-
cial temperature range.
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
Features
70mW Quiescent Power Consumption
1.7mW Low-Power Mode Consumption
0.1mW Shutdown Consumption
Clickless/Popless, DirectDrive Audio
Video Input Detection
Video Load Detection
Video Reconstruction Filter with 10MHz Passband
and 52dB Attenuation at 27MHz
3.3V and 12V Supply Voltages
MAX9598
Applications
Set-Top Boxes
TVs
DVD Players
Ordering Information
PART
MAX9598CTL+
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
40 TQFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
System Block Diagram
V12
12V
STB CHIP
I
2
C
μC
INTERRUPT OUTPUT
VVID
3.3V
VAUD
3.3V
MAX9598
RGB, Y/C, CVBS
I
2
C INTERFACE AND
REGISTERS
CVBS
L/R AUDIO
TV
SCART
VIDEO
ENCODER
STEREO
AUDIO
DAC
RGB, Y/C, CVBS
VIDEO FILTERS AND
CROSSPOINT
AUDIO CROSSPOINT
WITH DirectDrive
OUTPUTS
SLOW SWITCHING
FAST SWITCHING
CHARGE PUMP
EP
GNDVID
SLOW SWITCHING
FAST SWITCHING
SINGLE-ENDED
STEREO AUDIO
Y/C, CVBS
RGB, Y/C, CVBS
L/R AUDIO
SLOW SWITCHING
FAST SWITCHING
VCR
SCART
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

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