19-4159; Rev 1; 10/08
KIT
ATION
EVALU
BLE
AVAILA
Low-Power Audio/Video Interface
for Single SCART Connectors
General Description
Features
♦
53mW Quiescent Power Consumption
♦
5µW Shutdown Consumption
♦
Audio Operational Amplifiers to Create Input
Filters
♦
Clickless/Popless, DirectDrive Audio
♦
Video Reconstruction Filter with 10MHz Passband
and 43dB Attenuation at 27MHz
♦
3.3V and 12V Supply Voltages
MAX9597
The MAX9597 single SCART interface routes audio and
video signals between a set-top box decoder chip and
an external SCART connector under I
2
C control.
Operating from a 3.3V supply and a 12V supply, the
MAX9597 consumes 53mW during quiescent operation
and 254mW during average operation when driving
typical signals into typical loads.
The MAX9597 audio section contains left and right audio
paths with an independent operational amplifier at the
inputs. 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 MAX9597 video section contains 4 channels of
video filter amplifiers. The standard-definition video sig-
nals from the set-top box decoder chip are lowpass fil-
tered to remove out-of-bandwidth artifacts. The
MAX9597 also supports slow-switching and fast-switch-
ing signals.
The MAX9597 is available in a compact 28-pin thin
QFN package and is specified over the 0°C to +70°C
commercial temperature range.
Ordering Information
PART
MAX9597CTI+
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
28 TQFN-EP*
+Denotes
a lead-free/RoHS-compliant package.
*EP
= Exposed pad.
Applications
Set-Top Boxes
AV Receivers
TVs
DVD Players
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
System Block Diagram
V
12
12V
V
ID
3.3V
V
AUD
3.3V
STB CHIP
MAX9597
I
2
C INTERFACE
AND REGISTERS
RGB, Y/C, CVBS
VIDEO FILTERS
L/R AUDIO
FAST AND SLOW SWITCHING
AUDIO
WITH DirectDrive
OUTPUTS
TV
SCART
µC
I
2
C
VIDEO
ENCODER
RGB, Y/C, CVBS
STEREO
AUDIO
DAC
SINGLE OR
DIFFERENTIAL
STEREO AUDIO
SLOW SWITCHING
FAST SWITCHING
CHARGE PUMP
EP
GND
________________________________________________________________
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.
Low-Power Audio/Video Interface
for Single SCART Connectors
MAX9597
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted.)
V
VID
..........................................................................-0.3V to +4V
V
12
to EP ................................................................-0.3V to +14V
V
AUD
to EP ...............................................................-0.3V to +4V
EP to GND .............................................................-0.1V to +0.1V
All Video Inputs .......................................................-0.3V to +4V
All Audio Inputs to EP .............................(V
EP
- 1)V to (V
EP
+ 1)V
SDA, SCL, DEV_ADDR ............................................-0.3V to +4V
TV_SS_OUT .................................................-0.3V to (V
12
+ 0.3V)
Current
All Video/Audio Inputs ..................................................±20mA
C1P, C1N, CPVSS ........................................................±50mA
Output Short-Circuit Current Duration
All Video Outputs, TV_FS_OUT to V
VID
, GND........Continuous
Audio Outputs to V
AUD
, EP ....................................Continuous
TV_SS_OUT to V
12
, EP...........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
28-Pin Thin QFN
(derate 21.3mW/°C above +70°C) ...........................1702mW
Operating Temperature Range ..............................0°C to +70°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
VID
= V
AUD
= 3.3V, V
12
= 12V, GND = EP = 0, no load, T
A
= 0°C to +70°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
Video Supply Voltage Range
Audio Supply Voltage Range
Slow-Switching Supply Voltage
Range
V
VID
Quiescent Supply Current
SYMBOL
V
VID
V
AUD
V
12
CONDITIONS
Inferred from video PSRR test at 3.0V and
3.6V
Inferred from audio PSRR tests at 3.0V and
3.6V
Inferred from slow-switching levels
Normal operation, all video output
amplifiers are enabled
Shutdown
V
AUD
Quiescent Supply Current
V
12
Quiescent Supply Current
VIDEO CHARACTERISTICS
DC-COUPLED INPUT
Input Voltage Range
Input Current
Input Resistance
AC-COUPLED INPUT
Sync-Tip Clamp Level
Sync Crush
Input Clamping Current
V
CLP
Sync-tip clamp
Sync-tip clamp; percentage reduction in
sync pulse (0.3V
P-P
); guaranteed by input
clamping current measurement
Sync-tip clamp
2
-5
0
6.1
2
3
mV
%
µA
V
IN
I
IN
R
IN
R
L
= 75Ω to GND or
150Ω to V
VID
/2,
inferred from gain test
V
IN
= GND
V
VID
= 3V
V
VID
= 3.135V
V
VID
= 3.3V
1.3
2
300
3
µA
kΩ
1.15
1.2
V
P-P
I
AUD_Q
I
12_Q
Normal operation
Shutdown
Normal operation
Shutdown
MIN
3.0
3.0
11.4
TYP
3.3
3.3
12
13
1
3
0.01
1.5
0.1
MAX
3.6
3.6
12.6
20
10
4.1
10
100
10
UNITS
V
V
V
mA
µA
mA
µA
µA
I
VID_Q
2
_______________________________________________________________________________________
Low-Power Audio/Video Interface
for Single SCART Connectors
ELECTRICAL CHARACTERISTICS (continued)
(V
VID
= V
AUD
= 3.3V, V
12
= 12V, GND = EP = 0, no load, T
A
= 0°C to +70°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
Max Input Source Resistance
Bias Voltage
Input Resistance
DC CHARACTERISTICS
V
VID
= 3V,
V
IN
= V
CLP
to
(V
CLP
+ 1.15V)
R
L
= 75Ω
to GND
or
R
L
= 150Ω
to V
VID
/2
V
VID
= 3.135V,
V
IN
= V
CLP
to
(V
CLP
+ 1.2V)
V
VID
= 3V,
V
IN
= (V
BIAS
- 0.575V)
to (V
BIAS
+ 0.575V)
V
VID
= 3.135V
V
IN
= (V
BIAS
- 0.6V)
to (V
BIAS
+ 0.6V)
DC Gain Mismatch
Output Level
Guaranteed by DC voltage gain
Sync-tip clamp
Bias circuit
Sync-tip clamp, measured at
output, V
VID
= 3V, V
IN
= V
CLP
to (V
CLP
+ 1.15V), R
L
= 75Ω
to GND or R
L
= 150Ω to
V
VID
/2
Measured at output, V
VID
=
3.135V, V
IN
= V
CLP
to (V
CLP
+ 1.2V), R
L
= 75Ω to GND or
Guaranteed R
L
= 150Ω to V
VID
/2
by DC
Bias circuit, measured at
voltage gain output, V
VID
= 3V, V
IN
=
(V
BIAS
- 0.575V) to (V
BIAS
+
0.575V), R
L
= 75Ω to GND or
R
L
= 150Ω to V
VID
/2
Measured at output, V
VID
=
3.135V, V
IN
= (V
BIAS
- 0.6V)
to (V
BIAS
+ 0.6V), R
L
= 75Ω
to GND or R
L
= 150Ω to
V
VID
/2
Output disabled
3.0V
≤
V
VID
≤
3.6V
50
2
V
BIAS
Bias circuit
Bias circuit
0.57
SYMBOL
CONDITIONS
MIN
TYP
300
0.6
10
0.63
MAX
UNITS
Ω
V
kΩ
MAX9597
1.93
2
2.05
V/V
DC Voltage Gain
A
V
2
1.93
-2
0.2
1.38
2
2.05
+2
%
V
0.30
1.5
0.4
1.62
2.3
2.316
2.4
2.46
V
P-P
Output Voltage Swing
2.3
2.316
2.4
2.46
Output Short-Circuit Current
Output Leakage Current
Power-Supply Rejection Ratio
100
0.02
75
10
mA
µA
dB
_______________________________________________________________________________________
3
Low-Power Audio/Video Interface
for Single SCART Connectors
MAX9597
ELECTRICAL CHARACTERISTICS (continued)
(V
VID
= V
AUD
= 3.3V, V
12
= 12V, GND = EP = 0, no load, T
A
= 0°C to +70°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
AC CHARACTERISTICS
Filter Passband Flatness
Filter Attenuation
Differential Gain
Differential Phase
2T Pulse-to-Bar K Rating
2T Pulse Response
2T Bar Response
Nonlinearity
Group Delay Distortion
Peak Signal to RMS Noise
Power-Supply Rejection Ratio
Output Impedance
Video Crosstalk
Voltage Gain
Gain Mismatch
Flatness
Frequency Bandwidth
Capacitive Drive
Input Signal Amplitude
Output DC Level
Power-Supply Rejection Ratio
Signal-to-Noise Ratio
Total Harmonic Distortion Plus
Noise
Output Impedance
Mute Suppression
Audio Crosstalk
f = 20Hz to 20kHz, 0.25V
RMS
input
0.25V
RMS
input, frequency where output is
-3dB referenced to 1kHz
No sustained oscillations, 75Ω series
resistor on output
f = 1kHz, THD < 1%
No input signal, V
IN
= 0V
DC
f = 1kHz
f = 1kHz, 0.25V
RMS
input, 20Hz to 20kHz
R
L
= 3.33kΩ,
f = 1kHz
f = 1kHz
f = 1kHz, 0.25V
RMS
input
f = 1kHz, 0.25V
RMS
input
0.25V
RMS
input
0.5V
RMS
input
-3
75
110
91
97
0.0011
0.0021
0.28
101
100
DG
DP
V
OUT
= 2V
P-P
, f = 100kHz to 10MHz
V
OUT
= 2V
P-P
,
attenuation is
referred to 100kHz
f = 11MHz
f = 27MHz
f = 54MHz
1
3
43
63
0.2
0.3
0.5
0.5
0.5
0.5
3.5
60
47
5.5
-68.5
3.95
-1.5
0.01
205
300
0.5
+3
4
4.05
+1.5
%
Degrees
K%
K%
K%
%
ns
dB
dB
Ω
dB
V/V
%
dB
kHz
pF
V
RMS
mV
dB
dB
%
Ω
dB
dB
dB
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
5-step modulated staircase, f = 4.43MHz
5-step modulated staircase, f = 4.43MHz
2T = 200ns; bar time is 18µs; the beginning
2.5% and the ending 2.5% of the bar time is
ignored
2T = 200ns
2T = 200ns; bar time is 18µs; the beginning
2.5% and the ending 2.5% of the bar time is
ignored
5-step staircase
100kHz
≤
f
≤
5MHz, outputs are 2V
P-P
100kHz
≤
f
≤
5MHz
f = 100kHz, 100mV
P-P
f = 5MHz
f = 4.43MHz
AUDIO CHARACTERISTICS OUTPUT AMPLIFIER (Note 2)
4
_______________________________________________________________________________________
Low-Power Audio/Video Interface
for Single SCART Connectors
ELECTRICAL CHARACTERISTICS (continued)
(V
VID
= V
AUD
= 3.3V, V
12
= 12V, GND = EP = 0, no load, T
A
= 0°C to +70°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
VIDEO TO AUDIO INTERACTION
Crosstalk
Video input: f = 15kHz, 1V
P-P
signal
Audio input: f = 15kHz, 0.1V
RMS
signal
T
A
= +25°C
T
A
= 0°C to +70°C
100
1.5
-0.707
80
V
CM
= 0V
V
CM
= 0V, -0.8V
≤
V
OUT
≤
+0.8V
R
L
= 124Ω, inferred from A
VOL
test
90
60
1.6
8.25
1.24
f = 1kHz
f = 1kHz
A
VCL
= 1V/V, no sustained oscillation
13.5
0.2
20
580
I
OL
= 0.5mA
I
OH
= 0.5mA
V
VID
-
0.1
0.003
V
VID
-
0.003
5.5
R
L
= 143Ω to GND
R
L
= 143Ω to GND
10kΩ to EP, 11.4V
≤
V
12
≤
12.6V
10kΩ to EP, 11.4V
≤
V
12
≤
12.6V
10kΩ to EP, 11.4V
≤
V
12
≤
12.6V
5
10
-1
0.7 x
V
VID
+1
2
2
1.5
6.5
0.1
100
125
80
100
102
25
100
225
550
30
+0.707
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX9597
INPUT AMPLIFIER OPEN-LOOP CHARACTERISTICS
Input Offset Voltage
Input Bias Current
Input Offset Current
Common-Mode Input Voltage
Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Large-Signal Voltage Gain
Output Voltage Swing
Gain-Bandwidth Product
Slew Rate
Input Voltage-Noise Density
Input Current-Noise Density
Capacitive Load Stability
CHARGE PUMP
Switching Frequency
FAST SWITCHING
Output Low Voltage
Output High Voltage
Output Resistance
Rise Time
Fall Time
SLOW SWITCHING
Output Low Voltage
Output Medium Voltage
Output High Voltage
Input Current
DIGITAL INTERFACE (SDA, SCL)
Input High Voltage
V
IH
V
V
V
V
µA
V
V
Ω
ns
ns
kHz
V
OS
I
B
I
OS
V
CM
CMRR
PSRR
A
VOL
V
OUT
GBWP
SR
V
N
I
N
V
CM
= 0V
V
CM
= 0V
V
CM
= 0V
Inferred from CMRR test
µV
nA
nA
V
dB
dB
dB
V
P-P
MHz
V/µs
nV/√Hz
pA/√Hz
pF
_______________________________________________________________________________________
5
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