MAX9546/MAX9547
Differential Video Interface Chipset
________________________________________________________________ Maxim Integrated Products
1
19-3873; Rev 0; 10/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
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 MAX9546 specifies the common-mode
balance (CMB) of the differential outputs.
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 -40C to +85C extended tem-
perature range.
Applications
Automotive Video
Car Navigation
In-Car Entertainment
Collision Avoidance/Rearview Cameras
Security/CCTV Video
Avionics/In-Flight Entertainment
Features
Fault Detection (MAX9546)
Loss-of-Signal Detection (MAX9547)
Tolerate 2V Ground-Level Shift between Source
and Load
Specifies Common-Mode Balance (MAX9546)
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
Ordering Information
PART
PIN-
PACKAGE
PKG CODE
DESCRIPTION
MAX9546ESA+
8 SO-EP*
S8E-14
Driver
MAX9547ESA+
8 SO-EP*
S8E-14
Receiver
Note: These devices are specified for -40C to +85C temper-
ature range.
+Denotes lead-free package.
*EP = Exposed paddle.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
FAULT
OUT-
CLAMP
OUT+
V
CC
V
CC
ZT+
ZT-
IN+
IOUT
V
OUT
LOS
IN-
IN
MAX9547
MAX9546
MAX9546/MAX9547
Differential Video Interface Chipset
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
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.
(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
= +70C)
8-Pin SO (derate 19.2mW/C above +70C)...............1538mW
Operating Temperature Range ...........................-40C to +85C
Junction Temperature ..................................................... +150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
V
CC
Guaranteed by PSRR
7.5
8.5
10.0
V
Quiescent Supply Current
I
CC
No load
64
112
mA
Voltage Gain
A
V
V
IN
= 1.2V
P-P
(Note 3)
1.8
2
2.2
V/V
Input-Voltage Swing
V
IN
Guaranteed by A
V
1.2
V
P-P
Input Clamp Voltage
V
CLMP
(Note 4)
3.46
V
Input Clamp Current
I
CLMP
(Note 4)
7
13
A
Input Resistance
R
IN
(Notes 4, 5)
500
k
Output Common-Mode Voltage
V
COM
3.0
3.25
3.4
V
Output Impedance
R
OUT
0.1
OUT+ and/or OUT- to +16V
9
OUT+ and/or OUT- to + (V
CC
- 2V)
2
OUT+ and/or OUT- to +2V
4
OUT+ and/or OUT- to -2V
7
OUT+ and/or OUT- to +16V, V
CC
unconnected
6
Output Fault Current
I
F(OUT)
OUT+ or OUT- to -2V, V
CC
unconnected
24
mA
Differential mode
45
62
Power-Supply Rejection Ratio
PSRR
V
CC
from 7.5V to
10V (Note 6)
Common mode
46
52
dB
FAULT Output Logic Level
V
OL
, I
SINK
= 1.6mA (Note 7)
0.4
V
FAULT Output Leakage Current
0.01
A
DC ELECTRICAL CHARACTERISTICS--MAX9546
(V
CC
= +8.5V, R
L
= 220
between OUT+ and OUT-, T
A
= -40C to +85C. Typical values are at T
A
= +25C, unless otherwise
noted.) (Note 2)
MAX9546/MAX9547
Differential Video Interface Chipset
_______________________________________________________________________________________
3
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Large-Signal Bandwidth
V
IN
= 1V
P-P
, -3dB
18
MHz
Large-Signal Flatness
V
IN
= 1V
P-P
, 0.5dB
15
MHz
Slew Rate
SR
OUT+ - OUT-
70
V/s
Settling Time (0.1%)
t
SETTLING
V
IN
= 1V
P-P
400
ns
Power-Supply Rejection Ratio
PSRR
f = 100kHz, 100mV
P-P
ripple
63
dB
f = 100kHz
50
Common-Mode Balance (Note 8)
CMB
f = 3.58MHz
30
dB
Droop
Guaranteed by input current
1
%
AC ELECTRICAL CHARACTERISTICS--MAX9546
(V
CC
= +8.5V, R
L
= 220
across OUT+ and OUT-, T
A
= -40C to +85C. Typical values are at T
A
= +25C, unless otherwise noted.)
(Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
V
CC
Guaranteed by PSRR
7.5
8.5
10.0
V
Supply Current
I
CC
70
110
mA
Differential Input Voltage Range
|IN+ - IN-|
V
IN(P-P)
Guaranteed by CMRR (Note 9)
1.2
V
P-P
Common-Mode Input Voltage
Range
V
COM
Guaranteed by CMRR (Note 9)
1.0
5.4
V
Input Current
I
IN
6
30
A
Input Offset Current
I
IN
1
4.2
A
Input Resistance
R
IN
Differential
80
k
Voltage Gain
A
V
V
IN(P-P)
= 1.2V, defined as I
OUT
x (R
L
/ V
IN
)
0.90
1
1.15
V/V
Output Voltage
V
OB
IN+ = IN- = 3.2V
1
V
Output Voltage Swing
V
OUT
1.2
V
P-P
Maximum Output Current
I
OUT
V
IN
= 1V, Z
ZT
= 0
21
mA
Power-Supply Rejection Ratio
PSRR
V
CC
from 7.5V to 10V
26
34
dB
1V
V
COM
5.4V
42
54
Common-Mode Rejection Ratio
CMRR
2V
V
COM
4.4V
46
70
dB
LOS Logic Level
V
OL
, I
SINK
= 1.6mA (Note 10)
0.4
V
LOS Leakage Current
0.01
A
IN+ and/or IN- to +16V, R
T1
+ R
T2
= 110
50
IN+ and/or IN- to -2V, R
T1
+ R
T2
= 110
10
IN+ and/or IN- to +16V, V
CC
unconnected,
R
T1
+ R
T2
= 110
72
Input Fault Current
I
F
IN+ and/or IN- to -2V, V
CC
unconnected,
R
T1
+ R
T2
= 110
10
mA
DC ELECTRICAL CHARACTERISTICS--MAX9547
(V
CC
= +8.5V, GND = 0V, R
L
= 75
, Z
ZT
= 75
, T
A
= -40C to +85C. Typical values are at T
A
= +25C.) (Note 2)
MAX9546/MAX9547
Differential Video Interface Chipset
4
_______________________________________________________________________________________
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Large-Signal Bandwidth
V
IN
= 1V
P-P
, -3dB
20
MHz
Large-Signal Flatness
V
IN
= 1V
P-P
, 0.5dB
15
MHz
Slew Rate
SR
50
V/s
Settling Time (0.1%)
t
SETTLING
400
ns
Power-Supply Rejection Ratio
PSRR
f = 100kHz, 100mV
P-P
ripple
30
dB
Common-Mode Rejection Ratio
CMRR
f = 100kHz, 100mV
P-P
ripple
53
dB
LOS Timeout Period
t
LOS
760
s
AC ELECTRICAL CHARACTERISTICS--MAX9547
(V
CC
= +8.5V, GND = 0V, R
L
= 75
, Z
ZT
= 75
, C
L
= 50pF, T
A
= -40C to +85C, Typical values are at T
A
= +25C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Differential Gain
DG
3.8
%
Differential Phase
DP
0.6
degrees
Signal-to-Noise Ratio
SNR
5MHz lowpass, 100kHz highpass,
V
IN
= 1V
P-P
80
dB
2T Pulse-to-Bar Rating
2T = 250ns, bar time is 18s, the beginning
3.5% and the ending 3.5% of the bar time is
ignored
0.2
%
2T Pulse Response
2T = 250ns
0.25
%
Group Delay
D/dt
At 3.58MHz
10
ns
AC ELECTRICAL CHARACTERISTICS--MAX9546 Driving MAX9547
(V
CC
= +8.5V, R
L
= 220
across OUT+ and OUT-, R
L
= 75
(MAX9547), Z
ZT
= 75
, T
A
= -40C to +85C. Typical values are at T
A
=
+25C, unless otherwise noted.) (Note 2)
Note 2:
All devices are 100% production tested at T
A
= +25C. All temperature limits are guaranteed by design.
Note 3:
Defined as differential output to single-ended input.
Note 4:
Input is AC-coupled.
Note 5:
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 400
max. The clamp should remain stable in this condition.
Note 6:
Differential mode is defined as (OUT+ - OUT-). Common mode is defined as OUT+ + OUT-
2
Note 7:
A fault is when the outputs both sink and source current and the amount of extra current sink or source is greater than 3mA.
Note 8:
Common-mode balance is defined as 20log((OUT+ - OUT-) / (OUT+ + OUT-)).
Note 9:
Ground between MAX9546 and MAX9547 can be a 2V difference.
Note 10: 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.
MAX9546/MAX9547
Differential Video Interface Chipset
_______________________________________________________________________________________
5
GAIN vs. FREQUENCY
MAX9546 toc01
FREQUENCY (MHz)
GAIN (dB)
1
0.1
0.01
-20
-10
0
10
20
-30
0.001
10
MAX9546
MAX9547
GAIN vs. TEMPERATURE
MAX9546 toc02
TEMPERATURE (
C)
GAIN (dB)
60
35
-10
-15
-1
0
1
2
3
4
5
6
7
8
-2
-40
85
MAX9546
V
IN
= 1V
P-P
MAX9547
MAX9547 IOUT CURRENT vs. TEMPERATURE
MAX9546 toc03
TEMPERATURE (
C)
I
IOUT
(mA)
60
35
10
-15
17
19
21
23
25
15
-40
85
MAX9547 COMMON-MODE REJECTION
RATIO vs. FREQUENCY
MAX9546 toc04
FREQUENCY (MHz)
CMRR (dB)
1
0.1
0.001
0.01
-70
-60
-50
-40
-30
-20
-10
0
-80
0.0001
10
V
RIPPLE
= 100mV
P-P
MAX9547 COMMON-MODE REJECTION
RATIO vs. TEMPERATURE
MAX9546 toc05
TEMPERATURE (
C)
CMRR (dB)
60
35
-15
10
-70
-60
-50
-40
-30
-20
-10
0
-80
-40
85
V
COM
= 2V
V
COM
= 5.4V
V
RIPPLE
= 100mV
P-P
f
RIPPLE
= 10kHz
MAX9546 INPUT CLAMP CURRENT
vs. TEMPERATURE
MAX9546 toc06
TEMPERATURE (
C)
I
CLMP
(
A)
60
35
10
-15
6
7
8
9
10
5
-40
85
MAX9547 DIFFERENTIAL INPUT
RESISTANCE vs. TEMPERATURE
MAX9546 toc07
TEMPERATURE (
C)
DIFFERENTIAL R
IN
(k
)
60
35
10
-15
20
40
60
80
100
120
140
160
180
200
0
-40
85
MAX9546 DIFFERENTIAL OUTPUT
RESISTANCE vs. TEMPERATURE
MAX9546 toc08
TEMPERATURE (
C)
DIFFERENTIAL R
OUT
(m
)
60
35
10
-15
20
40
60
80
100
120
140
160
180
200
0
-40
85
Typical Operating Characteristics
(V
CC
= +8.5V, R
L
= 220
between OUT+ and OUT-, R
L
= 75
(MAX9547), Z
ZT
= 75
, T
A
= +25C, unless otherwise noted.)
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