MAX9655 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – Low-Power Video Switches for Dual SCART Connectors

19-4238; Rev 2; 11/08
EVAALVUAAILTAIOBNLEKIT
Low-Power Video Switches
for Dual SCART Connectors
General Description
The MAX9655/MAX9656 dual SCART switches route
video signals between a set-top box decoder chip and
two external SCART connectors. Under the control of the
TV_SEL logic input, the MAX9655 selects whether the
CVBS and RGB signals from the encoder or the VCR
SCART are routed to the TV SCART. The CVBS signal
from the encoder is always routed to the VCR SCART.
The MAX9656 is similar to the MAX9655 except that
under the control of the VCR_SEL logic input, the
MAX9656 selects whether the CVBS signal from the
encoder or the TV SCART is routed to the VCR SCART.
The MAX9656 also features a low-power shutdown
mode, in which quiescent current falls to 35µA.
The incoming video signals must be AC-coupled to the
inputs, which have sync-tip clamps to set the internal
DC level. After the input stages, multiplexers select
which video signals are routed to the reconstruction fil-
ters and output amplifiers. The reconstruction filters are
optimized for standard-definition signals and typically
have ±1dB passband flatness out to 9.5MHz and 47dB
attenuation at 27MHz.
The amplifiers have 2V/V gain, and the outputs can be
DC-coupled to a 75Ω load, which is the equivalent of
two video loads, or AC-coupled to a 150Ω load.
Applications
SCART Set-Top Boxes
Features
♦ Dual SCART Support for Video Signals
♦ Supports CVBS Input from TV SCART (MAX9656)
♦ Reconstruction Filters with 9.5MHz Passband and
47dB Attenuation at 27MHz
♦ Fixed Gain of 2V/V
♦ Input Sync-Tip Clamps
♦ 2.7V to 3.6V Single-Supply Operation
Ordering Information
PART
PIN-PACKAGE
TV SCART CVBS
RETURN SUPPORT
MAX9655AEE+
16 QSOP
No
MAX9656AEP+
20 QSOP
Yes
Note: All devices are specified over the -40°C to +125°C oper-
ating temperature range.
+Denotes a lead-free/RoHS-compliant package.
Pin Configurations and Typical Application Circuits appear
at end of data sheet.
Functional Diagram
UNKNOWN
BIAS
TV_SEL
ENC_B_IN
ENC_G_IN
ENC_R_IN
ENC_CVBS_IN
VCR_B_IN
VCR_G_IN
VCR_R_IN
VCR_CVBS_IN
VDD
0
1
0
1
0
1
0
1
TV_SEL
BUFFER
CLAMPREF
BUFFER
CLAMPREF
BUFFER
CLAMPREF
BUFFER
CLAMPREF
BUFFER
0
MAX9655
TV_B_OUT
LPF
2V/V
300mV
TV_G_OUT
LPF
2V/V
TV_R_OUT
LPF
2V/V
TV_CVBS_OUT
LPF
2V/V
VCR_CVBS_OUT
LPF
2V/V
CLAMPREF
GND
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