max9670 Maxim Integrated Products, Inc., max9670 Datasheet
max9670
Manufacturer Part Number
max9670
Description
Low-power Audio/video Switches With Audio Volume Control For Dual Scart Connectors
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX9670.pdf
(44 pages)
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max9670CTL+
Manufacturer:
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max9670CTL+
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The MAX9670/MAX9671 dual SCART matrices route
audio and video signals between a set-top box
decoder chip and two external SCART connectors
under I
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.
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
create a 2V
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.
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.
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.
19-4653; Rev 1; 3/10
Typical Application Circuit appears at end of data sheet.
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
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.
Set-Top Boxes
TVs
DVD Players
2
C control. Operating from a 3.3V supply and a
Volume Control for Dual SCART Connectors
RMS
Low-Power Audio/Video Switch with Audio
full-scale audio signal biased around
________________________________________________________________ Maxim Integrated Products
General Description
Applications
®
output amplifiers
o 66mW Quiescent Power Consumption
o 2.8mW Standby Mode Consumption
o Programmable Audio Gain Control of -62dB to
o Clickless, Popless, DirectDrive Audio
o Video Input and Video Load Detection
o Video Reconstruction Filter with 10MHz Passband
o 3.3V and 12V Supply Voltages
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
MAX9671CTH+
MAX9670CTL+
0dB (TV Audio Outputs)
and 52dB Attenuation at 27MHz
STB CHIP
PART
ENCODER
STEREO
VIDEO
AUDIO
DAC
µC
SINGLE-ENDED R/L
RGB, Y/C, CVBS
STEREO AUDIO
INTERRUPT
OUTPUT
I
2
C
TEMP RANGE
0°C to +70°C
0°C to +70°C
System Block Diagram
12V
Ordering Information
V
EP
MAX9670/MAX9671
12
VIDEO FILTERS AND
AUDIO CROSSPOINT
WITH DIRECTDRIVE
OUTPUTS, VOLUME
SLOW SWITCHING
FAST SWITCHING
REGISTERS AND
I
CHARGE PUMP
2
CROSSPOINT
C INTERFACE
CONTROL
ACTIVITY
MONITOR
3.3V
V
VID
GNDVID
3.3V
PIN-
PACKAGE
40 TQFN-EP*
44 TQFN-EP*
V
AUD
(MAX9671 ONLY)
(MAX9670 ONLY)
SLOW SWITCHING
SLOW SWITCHING
FAST SWITCHING
FAST SWITCHING
RGB, Y/C, CVBS
RGB, Y/C, CVBS
L/R AUDIO
L/R AUDIO
Y/C, CVBS
L/R AUDIO
CVBS
Features
INPUTS
TV R+L
AUDIO
SCART
SCART
Yes
No
VCR
TV
1
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