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MAX9655AEE+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
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
MAX9655/MAX9656
Low-Power Video Switches
for Dual SCART Connectors
________________________________________________________________
Maxim Integrated Products
1
19-4238; Rev 2; 11/08
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.
EVALUATION KIT
AVAILABLE
UNKNOWN
BIAS
ENC_CVBS_IN
300mV
ENC_R_IN
TV_G_OUT
ENC_G_IN
ENC_B_IN
TV_B_OUT
TV_CVBS_OUT
TV_R_OUT
VCR_CVBS_OUT
VCR_CVBS_IN
VCR_R_IN
VCR_G_IN
VCR_B_IN
TV_SEL
TV_SEL
0
1
0
1
0
1
0
1
0
V
DD
GND
MAX9655
LPF
BUFFER
CLAMPREF
LPF
BUFFER
CLAMPREF
LPF
BUFFER
CLAMPREF
LPF
BUFFER
CLAMPREF
2V/V
2V/V
2V/V
2V/V
2V/V
LPF
BUFFER
CLAMPREF
Functional Diagram
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.
MAX9655/MAX9656
Low-Power Video Switches
for Dual SCART Connectors
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= 3.3V, V
GND
= 0, V
SHDN
= V
DD
, VCR_SEL = V
DD
, TV_SEL = V
DD
, R
L
= 150Ω to GND, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage
V
DD
to GND...........................................................-0.3V to +4V
All Video and Logic Input Pins..................(GND - 0.3V) to +4V
Duration of Output Short Circuit to V
DD
or GND ........Continuous
Continuous Input Current
All Video and Logic Input Pins .....................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)............667mW
20-Pin QSOP (derate 9.1mW/°C above +70°C)............727mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V
DD
Guaranteed by power-supply rejection test 2.7 3.3 3.6 V
Quiescent Supply Current I
DD
No load 21 45 mA
Shutdown Supply Current I
SHDN
V
SHDN
= TV_SEL = VCR_SEL = GND
(MAX9656 only)
35 70 µA
Input Voltage Unselected input V
DD
/3 V
Input Resistance
Unselected input 222 kΩ
Sync-Tip Clamp Level V
CLP
0.23 0.3 0.39 V
2.7V ≤ V
DD
≤ 3.6V 1.05
Input Voltage Range
Guaranteed by output-
voltage swing
3.0V ≤ V
DD
≤ 3.6V 1.2
V
P-P
Sync Crush
Sync-tip clamp; percentage reduction in
sync pulse (0.3V
P-P
); guaranteed by input
clamping current measurement
2%
Input Clamping Current 12µA
Maximum Input Source
Resistance
300 Ω
V
DD
= 2.7V, 0V ≤ V
IN
≤ 1.05V
1.96 2 2.04
DC Voltage Gain A
V
R
L
= 150Ω to GND
(Note 2)
V
DD
= 3.0V, 0V ≤ V
IN
≤ 1.2V
1.96 2 2.04
V/V
DC Gain Mismatch Guaranteed by output-voltage swing -2 +2 %
Output Level Measured at output, C
IN_
= 0.1µF to GND 0.218 0.3 0.39 V
Measured at output, V
DD
= 2.7V, V
IN
=
V
CLP
to (V
CLP
+1.05V), R
L
= 150Ω to -0.2V
2.1
Measured at output, V
DD
= 2.7V, V
IN
=
V
CLP
to (V
CLP
+1.05V), R
L
= 150Ω to V
DD
/2
2.1
Measured at output, V
DD
= 3.0V, V
IN
=
V
CLP
to (V
CLP
+1.2V), R
L
= 150Ω to -0.2V
2.4
Measured at output, V
DD
= 3.0V, V
IN
=
V
CLP
to (V
CLP
+1.2V), R
L
= 150Ω to V
DD
/2
2.4
Output-Voltage Swing
Measured at output, V
DD
= 3.135V, V
IN
=
V
CLP
to (V
CLP
+1.05V), R
L
= 75Ω to -0.2V
2.1
V
P-P
MAX9655/MAX9656
Low-Power Video Switches
for Dual SCART Connectors
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Short to GND (sourcing) 140
Output Short-Circuit Current
Short to V
DD
(sinking) 70
mA
Output Resistance R
OUT
V
OUT
= 1.5V, -10mA ≤ I
LOAD
≤ +10mA 0.2 Ω
2.7V ≤ V
DD
≤ 3.6V 48 64
Power-Supply Rejection Ratio
f = 1MHz, 100mV
P-P
20
dB
V
OUT
= 2V
P-P
, reference frequency is
100kHz, ±1dB passband flatness
9.5 MHz
f = 5.5MHz 0.1
f = 9.5MHz -1
f = 10MHz -3
Standard-Definition
Reconstruction Filter
V
OUT
= 2V
P-P
, reference
frequency is 100kHz
f = 27MHz -47
dB
Differential Gain DG
5-step modulated staircase of 129mV step
size and 286mV peak-to-peak subcarrier
amplitude, f = 4.43MHz
0.4 %
Differential Phase DP
5-step modulated staircase of 129mV step
size and 286mV peak-to-peak subcarrier
amplitude, f = 4.43MHz
0.45 deg
Group-Delay Distortion 100kHz ≤ f ≤ 5MHz, outputs are 2V
P-P
9ns
Peak Signal to RMS Noise 100kHz ≤ f ≤ 5MHz 71 dB
2T Pulse Response 2T = 200ns 0.2 K%
2T Bar Response
2T = 200ns; bar time is 18µs; the beginning
2.5% and the ending 2.5% of the bar time
are ignored
0.2 K%
2T Pulse-to-Bar K Rating
2T = 200ns; bar time is 18µs; the beginning
2.5% and the ending 2.5% of the bar time
are ignored
0.3 K%
Nonlinearity 5-step staircase 0.1 %
Output Impedance f = 5.5MHz 8.07 Ω
f = 15kHz -82
All-Hostile Crosstalk
f = 4.43MHz -78
dB
Output-to-Input Crosstalk f = 30MHz -68 dB
LOGIC SIGNALS (MAX9655: TV_SEL, MAX9656: TV_SEL, VCR_SEL, SHDN)
Logic-Low Threshold V
IL
T
A
= +25°C
0.3 x
V
DD
V
Logic-High Threshold V
IH
T
A
= +25°C
0.7 x
V
DD
V
Logic Input Current I
IN
T
A
= +25°C10µA
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 3.3V, V
GND
= 0, V
SHDN
= V
DD
, VCR_SEL = V
DD
, TV_SEL = V
DD
, R
L
= 150Ω to GND, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
Note 1: All devices are 100% production tested at T
A
= +25°C. Specifications over temperature limits are guaranteed by design.
Note 2: Voltage gain (A
V
) is a two-point measurement in which the output-voltage swing is divided by the input-voltage swing.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX9655AEE+

Mfr. #:
Buy MAX9655AEE+
Manufacturer:
Maxim Integrated
Description:
Video Switch ICs Video Switch f/Dual SCART Connector
Lifecycle:
New from this manufacturer.
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