19-4653; Rev 1; 3/10
Low-Power Audio/Video Switch with Audio
Volume Control for Dual SCART Connectors
0/MAX9671
General Description
Features
The MAX9670/MAX9671 dual SCART matrices route
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 MAX9670/MAX9671 consume 66mW
during quiescent operation and 300mW during average
operation when driving typical signals into typical
loads. Video input detection, video load detection, and
a 2.8mW standby mode facilitate the design of intelli-
gent, low-power set-top boxes.
o 66mW Quiescent Power Consumption
o 2.8mW Standby Mode Consumption
o Programmable Audio Gain Control of -62dB to
0dB (TV Audio Outputs)
o Clickless, Popless, DirectDrive Audio
o Video Input and Video Load Detection
o Video Reconstruction Filter with 10MHz Passband
and 52dB Attenuation at 27MHz
The MAX9670/MAX9671 audio section contains a
buffered crosspoint to route audio inputs to audio out-
puts and programmable volume control from -62dB to
0dB in 2dB steps. The DirectDrive® output amplifiers
o 3.3V and 12V Supply Voltages
create a 2V
full-scale audio signal biased around
RMS
Ordering Information
ground, eliminating the need for bulky output capaci-
tors 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 MAX9671 offers TV left and right audio
inputs.
TV R+L
AUDIO
INPUTS
PIN-
PACKAGE
PART
TEMP RANGE
MAX9670CTL+
MAX9671CTH+
0°C to +70°C 40 TQFN-EP*
0°C to +70°C 44 TQFN-EP*
No
Yes
The MAX9670/MAX9671 video section contains a
buffered crosspoint to route video inputs to video out-
puts. The standard-definition video signals from the set-
top box decoder chip are lowpass filtered to remove
out-of-band artifacts.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
System Block Diagram
The MAX9670/MAX9671 also support slow-switching
and fast-switching signals. An interrupt signal from the
MAX9670/MAX9671 informs the microcontroller when
the system status has changed.
V
V
AUD
V
VID
12
12V
3.3V
3.3V
STB CHIP
MAX9670/MAX9671
Applications
RGB, Y/C, CVBS
CVBS
2
I C
2
Set-Top Boxes
TVs
I C INTERFACE
L/R AUDIO
(MAX9671 ONLY)
REGISTERS AND
ACTIVITY
INTERRUPT
OUTPUT
µC
MONITOR
TV
SCART
L/R AUDIO
(MAX9670 ONLY)
DVD Players
SLOW SWITCHING
FAST SWITCHING
RGB, Y/C, CVBS
VIDEO FILTERS AND
CROSSPOINT
VIDEO
ENCODER
Y/C, CVBS
SINGLE-ENDED R/L
STEREO AUDIO
AUDIO CROSSPOINT
WITH DIRECTDRIVE
OUTPUTS, VOLUME
CONTROL
STEREO
AUDIO
DAC
RGB, Y/C, CVBS
L/R AUDIO
VCR
SCART
SLOW SWITCHING
FAST SWITCHING
SLOW SWITCHING
FAST SWITCHING
Typical Application Circuit appears at end of data sheet.
CHARGE PUMP
EP
GNDVID
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
________________________________________________________________ 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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