MAX9598 Datasheet, PDF (1/35 Pages) Maxim Integrated Products – Low-Power Audio/Video Switch for Dual SCART Connectors

19-3209; Rev 0; 2/08
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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 I²C 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.
Features
o 70mW Quiescent Power Consumption
o 1.7mW Low-Power Mode Consumption
o 0.1mW Shutdown Consumption
o Clickless/Popless, DirectDrive Audio
o Video Input Detection
o Video Load Detection
o Video Reconstruction Filter with 10MHz Passband
and 52dB Attenuation at 27MHz
o 3.3V and 12V Supply Voltages
Applications
Set-Top Boxes
TVs
DVD Players
Ordering Information
PART
TEMP RANGE
MAX9598CTL+ 0°C to +70°C
+Denotes a lead-free package.
*EP = Exposed pad.
PIN-PACKAGE ^PKG
CODE
40 TQFN-EP* T4066+3
System Block Diagram
STB CHIP
μC
VIDEO
ENCODER
STEREO
AUDIO
DAC
I²C
INTERRUPT OUTPUT
RGB, Y/C, CVBS
SINGLE-ENDED
STEREO AUDIO
V12
12V
VVID
3.3V
VAUD
3.3V
MAX9598
I²C INTERFACE AND
REGISTERS
VIDEO FILTERS AND
CROSSPOINT
AUDIO CROSSPOINT
WITH DirectDrive
OUTPUTS
SLOW SWITCHING
FAST SWITCHING
CHARGE PUMP
EP
GNDVID
RGB, Y/C, CVBS
CVBS
L/R AUDIO
SLOW SWITCHING
FAST SWITCHING
Y/C, CVBS
RGB, Y/C, CVBS
L/R AUDIO
SLOW SWITCHING
FAST SWITCHING
TV
SCART
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.