19-3873; Rev 3; 10/07
Differential Video Interface Chipset
General Description
The MAX9546/MAX9547 differential interface chipset
converts single-ended voltages to differential voltages for
transport and then converts back to single-ended volt-
ages. These devices eliminate costly, bulky, single-
ended coaxial cables with inexpensive, readily available,
differential shielded (ScTP) or unshielded (UTP) twisted
pairs. The fault detection of the MAX9546 and loss-of-sig-
nal detection of the MAX9547 allow proactive and
speedy diagnosis, such as identifying failures in the man-
ufacturing stage and troubleshooting equipment at repair
facilities. The MAX9546/MAX9547 are low-cost, conve-
nient solutions for transporting CVBS/FBAS analog video
signals (PAL or NTSC) through hostile environments.
The MAX9546 driver converts the single-ended input into
a differential output with a 6dB fixed gain to drive a back-
terminated, DC-coupled differential video output to unity
gain. This DC connection allows the detection of a short-
circuit condition at the differential outputs. The
FAULT
output indicates a short-circuit condition including a short
to a high battery condition (V
BAT
= +16V) or ground.
The MAX9547 receiver converts the differential signal
from the MAX9546 into a single-ended signal. Like the
MAX9546 output, the MAX9547 input survives a short to
a high battery condition or ground. The MAX9547 receiv-
er loss-of-signal output (LOS) operates by detecting the
H-Sync and thus can support both monochrome and
color video signals. The MAX9547 gain is set with an
external impedance between ZT+ and ZT-.
The MAX9546/MAX9547 operate from a 7.5V to 10V
single supply. Both devices include ±15kV ESD Human
Body Model (HBM) protection. The MAX9546/MAX9547
are offered in a thermally enhanced 8-pin SO package
and specified over the -40°C to +85°C extended tem-
perature range.
♦
Fault Detection (MAX9546)
♦
Loss-of-Signal Detection (MAX9547)
♦
Tolerate ±2V Ground-Level Shift between Source
and Load
♦
±15kV ESD Protection (Human Body Model)
♦
±8kV—IEC 1000-4-2 Contact Discharge
♦
±15kV—IEC 1000-4-2 Air-Gap Discharge
♦
Preset 6dB Gain (MAX9546)
♦
Variable Receiver Gain (MAX9547)
♦
7.5V to 10V Single-Supply Operation
Features
MAX9546/MAX9547
Ordering Information
PART
MAX9546ESA+
MAX9547ESA+
PIN-
PACKAGE
8 SO-EP*
8 SO-EP*
PKG CODE
S8E-14
S8E-14
DESCRIPTION
Driver
Receiver
Note:
These devices are specified for -40°C to +85°C temper-
ature range.
+Denotes
a lead-free package.
*EP
= Exposed paddle.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
V
CC
V
CC
Applications
Automotive Video
Car Navigation
In-Car Entertainment
Collision Avoidance/Rearview Cameras
Security/CCTV Video
Avionics/In-Flight Entertainment
CLAMP
FAULT
LOS
IN
OUT-
IN-
ZT+
MAX9546
ZT-
OUT+
IN+
MAX9547
IOUT
V
OUT
________________________________________________________________
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.
Differential Video Interface Chipset
MAX9546/MAX9547
ABSOLUTE MAXIMUM RATINGS
(Voltages are referenced GND.)
V
CC
to GND ............................................................-0.3V to +11V
IN and
FAULT
(MAX9546)......................... -0.3V to (V
CC
+ 0.3V)
OUT+, OUT- (MAX9546) (Note 1) .............................-2V to +16V
FAULT
Short-Circuit Duration to
V
CC
or GND (MAX9546) .........................................Continuous
IN+, IN- (MAX9547) (Note 1).....................................-2V to +16V
IOUT,
LOS,
ZT+, ZT- (MAX9547) ...............-0.3V to (V
CC
+ 0.3V)
Differential Input Voltage (|V
IN+
- V
IN-
|) (MAX9547)...............+5V
IOUT,
LOS
Short-Circuit Duration to
V
CC
or GND (MAX9547) .........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO-EP (derate 24.4mW/°C above +70°C) ......1951.2mW
θ
JC
(Note 2).....................................................................7.0°C/W
θ
JA
.................................................................................41.0°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ..................................................... +150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
The Absolute Maximum Ratings of OUT+/OUT- for the MAX9546 and IN+/IN- for the MAX9547 are based on a single-fault
condition, i.e. only one output of MAX9546 (or both outputs together) is shorted to the battery, V
CC
or GND. The devices will
not survive a double-fault condition, i.e. OUT+ and OUT- shorted to different supplies.
Note 2:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer
board. For detailed information on package thermal considerations see www.maxim-ic.com/thermal-tutorial.
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.
DC ELECTRICAL CHARACTERISTICS—MAX9546
(V
CC
= +8.5V, R
L
= 220Ω between OUT+ and OUT-, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise
noted.) (Note 3)
PARAMETER
Supply Voltage Range
Quiescent Supply Current
Voltage Gain
Input-Voltage Swing
Input Clamp Voltage
Input Clamp Current
Input Resistance
Output Common-Mode Voltage
Output Impedance
SYMBOL
V
CC
I
CC
A
V
V
IN
V
CLMP
I
CLMP
R
IN
V
COM
R
OUT
OUT+ and/or OUT- to +16V
OUT+ and/or OUT- to + (V
CC
- 2V)
OUT+ and/or OUT- to +2V
Output Fault Current
I
F(OUT)
OUT+ and/or OUT- to -2V
OUT+ and/or OUT- to +16V, V
CC
unconnected
OUT+ or OUT- to -2V, V
CC
unconnected
Power-Supply Rejection Ratio
FAULT
Output Logic Level
FAULT
Output Leakage Current
PSRR
V
CC
from 7.5V to
10V (Note 7)
Differential mode
Common mode
45
46
No load
V
IN
= 1.2V
P-P
(Note 4)
Guaranteed by A
V
(Note 5)
(Note 5)
(Notes 5, 6)
3.0
3.46
7
500
3.25
0.1
9
2
4
7
6
24
62
52
0.4
0.01
dB
V
µA
mA
3.4
13
1.8
CONDITIONS
Guaranteed by PSRR
MIN
7.5
TYP
8.5
64
2
MAX
10.0
112
2.2
1.2
UNITS
V
mA
V/V
V
P-P
V
µA
kΩ
V
Ω
V
OL
, I
SINK
= 1.6mA (Note 8)
2
_______________________________________________________________________________________
Differential Video Interface Chipset
AC ELECTRICAL CHARACTERISTICS—MAX9546
(V
CC
= +8.5V, R
L
= 220Ω across OUT+ and OUT-, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.)
(Note 3)
PARAMETER
Large-Signal Bandwidth
Large-Signal Flatness
Slew Rate
Settling Time (0.1%)
Power-Supply Rejection Ratio
Common-Mode Balance (Note 9)
Droop
Differential Gain
Differential Phase
SNR (dB
RMS
)
2T Pulse to Bar Rating
2T Pulse Response
Group Delay
Horizontal Tilt
Vertical Tilt
D/dt
DG
DP
SNR
SR
SYMBOL
CONDITIONS
V
IN
= 1V
P-P
, -3dB
V
IN
= 1V
P-P
, ±0.5dB
OUT+ - OUT-
t
SETTLING
V
IN
= 1V
P-P
PSRR
CMB
f = 100kHz, 100mV
P-P
ripple
f = 100kHz
f = 3.58MHz
Guaranteed by input current
(Note 10)
(Note 10)
(Note 10)
(Note 10)
(Note 10)
At 3.58MHz (Note 10)
(Notes 10, 15)
(Notes 10, 15)
MIN
TYP
18
15
70
400
63
55
39
1
1.37
0.14
-62
-0.22
0.30
2.20
0
6.62
MAX
UNITS
MHz
MHz
V/µs
ns
dB
dB
%
%
degrees
dB
%KF
%KF
ns
%
%
MAX9546/MAX9547
DC ELECTRICAL CHARACTERISTICS—MAX9547
(V
CC
= +8.5V, GND = 0V, R
L
= 75Ω, Z
ZT
= 75Ω, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
Supply Voltage Range
Supply Current
Differential Input Voltage Range
|IN+ - IN-|
Common-Mode Input Voltage
Range
Input Current
Input Offset Current
Input Resistance
Voltage Gain
Output Voltage
Output Voltage Swing
Maximum Output Current
Power-Supply Rejection Ratio
Common-Mode Rejection Ratio
SYMBOL
V
CC
I
CC
V
IN(P-P)
V
COM
I
IN
∆I
IN
R
IN
A
V
V
OB
V
OUT
I
OUT
PSRR
CMRR
V
IN
= 1V, Z
ZT
= 0
V
CC
from 7.5V to 10V
1V
≤
V
COM
≤
5.4V
2V
≤
V
COM
≤
4.4V
26
42
46
21
34
54
70
Differential
V
IN(P-P)
= 1.2V, defined as I
OUT
x (R
L
/ V
IN
)
IN+ = IN- = 3.2V
0.90
Guaranteed by CMRR (Note 11)
Guaranteed by CMRR (Note 11)
1.0
6
1
80
1
1
1.2
1.15
CONDITIONS
Guaranteed by PSRR
MIN
7.5
TYP
8.5
70
MAX
10.0
110
1.2
5.4
30
4.2
UNITS
V
mA
V
P-P
V
µA
µA
kΩ
V/V
V
V
P-P
mA
dB
dB
_______________________________________________________________________________________
3
Differential Video Interface Chipset
MAX9546/MAX9547
DC ELECTRICAL CHARACTERISTICS—MAX9547 (continued)
(V
CC
= +8.5V, GND = 0V, R
L
= 75Ω, Z
ZT
= 75Ω, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
LOS
Logic Level
LOS
Leakage Current
IN+ and/or IN- to +16V, R
T1
+ R
T2
= 110Ω
IN+ and/or IN- to -2V, R
T1
+ R
T2
= 110Ω
Input Fault Current
I
F
IN+ and/or IN- to +16V, V
CC
unconnected,
R
T1
+ R
T2
= 110Ω
IN+ and/or IN- to -2V, V
CC
unconnected,
R
T1
+ R
T2
= 110Ω
SYMBOL
CONDITIONS
V
OL
, I
SINK
= 1.6mA (Note 12)
0.01
50
10
72
10
mA
MIN
TYP
MAX
0.4
UNITS
V
µA
AC ELECTRICAL CHARACTERISTICS—MAX9547
(V
CC
= +8.5V, GND = 0V, R
L
= 75Ω, Z
ZT
= 75Ω, C
L
= 50pF, T
A
= -40°C to +85°C, Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
Large-Signal Bandwidth
Large-Signal Flatness
Slew Rate
Settling Time (0.1%)
Power-Supply Rejection Ratio
Common-Mode Rejection Ratio
LOS
Timeout Period
Differential Gain
Differential Phase
SNR (dB
RMS
)
2T Pulse to Bar Rating
2T Pulse Response
Group Delay
Horizontal Tilt
Vertical Tilt
D/dt
SR
t
SETTLING
PSRR
CMRR
t
LOS
DG
DP
SNR
(Notes 13, 14)
(Notes 13, 14)
(Notes 13, 14)
(Notes 13, 14)
(Notes 13, 14)
At 3.58MHz (Notes 13, 14)
(Notes 13, 14, 15)
(Notes 13, 14, 15)
f = 100kHz, 100mV
P-P
ripple
f = 100kHz, 100mV
P-P
ripple
SYMBOL
CONDITIONS
V
IN
= 1V
P-P
, -3dB
V
IN
= 1V
P-P
, ±0.5dB
MIN
TYP
20
15
50
400
30
53
760
2.65
0.57
-72
-0.06
0.40
0
0.10
1.16
MAX
UNITS
MHz
MHz
V/µs
ns
dB
dB
µs
%
degrees
dB
%KF
%KF
ns
%
%
4
_______________________________________________________________________________________
Differential Video Interface Chipset
AC ELECTRICAL CHARACTERISTICS—MAX9546 Driving MAX9547
(V
CC
= +8.5V, R
L
= 220Ω across OUT+ and OUT-, R
L
= 75Ω (MAX9547), Z
ZT
= 75Ω, T
A
= -40°C to +85°C. Typical values are at T
A
=
+25°C, unless otherwise noted.) (Note 3)
PARAMETER
Differential Gain
Differential Phase
Signal-to-Noise Ratio
SYMBOL
DG
DP
SNR
5MHz lowpass, 100kHz highpass,
V
IN
= 1V
P-P
2T = 250ns, bar time is 18µs, the beginning
3.5% and the ending 3.5% of the bar time is
ignored
2T = 250ns
D/dt
At 3.58MHz
(Note 15)
(Note 15)
CONDITIONS
MIN
TYP
3.8
0.6
80
MAX
UNITS
%
degrees
dB
MAX9546/MAX9547
2T Pulse-to-Bar Rating
2T Pulse Response
Group Delay
Horizontal Tilt
Vertical Tilt
0.2
0.25
10
0.12
0.26
%
%
ns
%
%
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
Note 14:
Note 15:
All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Defined as differential output to single-ended input.
Input is AC-coupled.
The RC time constant (3Hz) formed by the source resistance (R
S
) and coupling capacitor (C
IN
) is usually used for lead
compensation of the active clamp. The source resistance is 400Ω max. The clamp should remain stable in this condition.
Differential mode is measured as (OUT+ - OUT-). Common mode is measured as OUT+ + OUT-
2
A fault is when the outputs both sink and source current and the amount of extra current sink or source is greater than 3mA.
Common-mode balance is measured as 20log((OUT+ - OUT-) / (OUT+ + OUT-)).
2
These results were measured with a MAX4144 receiver, other receivers may affect results.
Ground between MAX9546 and MAX9547 can be a ±2V difference.
A loss-of-signal is when the input video signal of the MAX9547 does not change (cross 100mV level from sync tip) for 10
video lines.
These results were measured with a MAX4447 transmitter and a MAX4012 buffer amplifier with a gain of 4. Using other
devices may affect results.
MAX9547 topology shown in Figure 3.
Input capacitor for this test is 0.33µF.
_______________________________________________________________________________________
5
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