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, differ-
ential shielded (ScTP) or unshielded (UTP) twisted pairs.
The fault detection of the MAX9546 and loss-of-signal
detection of the MAX9547 allow proactive and speedy
diagnosis, such as identifying failures in the manufactur-
ing stage and troubleshooting equipment at repair facili-
ties. The MAX9546/MAX9547 are low-cost, convenient
solutions for transporting CVBS/FBAS analog video sig-
nals (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 (VBAT = +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 receiver
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 tempera-
ture range.
Applications
●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
●±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
Pin Configuration appears at end of data sheet.
19-3873; Rev 4; 9/14
Note: These devices are specified for -40°C to +85°C tempera-
ture range.
+Denotes a lead-free package.
*EP = Exposed paddle.
PART PIN-
PACKAGE PKG CODE DESCRIPTION
MAX9546ESA+ 8 SO-EP* S8E-14 Driver
MAX9547ESA+ 8 SO-EP* S8E-14 Receiver
FAULT
OUT-
CLAMP
OUT+
VCC VCC
ZT+
ZT-
IN+
IOUT VOUT
LOS
IN-
IN
MAX9547
MAX9546
MAX9546/MAX9547 Differential Video Interface Chipset
Typical Operating Circuit
Ordering Information
(Voltages are referenced GND.)
VCC to GND ....................................................... -0.3V to +11V
IN and FAULT (MAX9546) ...................... -0.3V to (VCC + 0.3V)
OUT+, OUT- (MAX9546) (Note 1) ............................-2V to +16V
FAULT Short-Circuit Duration to
VCC or GND (MAX9546) .......................................Continuous
IN+, IN- (MAX9547) (Note 1) ...................................-2V to +16V
IOUT, LOS, ZT+, ZT- (MAX9547) ............. -0.3V to (VCC + 0.3V)
Differential Input Voltage (|VIN+ - VIN-|) (MAX9547) .............+5V
IOUT, LOS Short-Circuit Duration to
VCC or GND (MAX9547) .......................................Continuous
Continuous Power Dissipation (TA = +70°C)
8-Pin SO-EP (derate 24.4mW/°C above +70°C) ....1951.2mW
θJC (Note 2) ...................................................................7.0°C/W
θJA ................................................................................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
(VCC = +8.5V, RL = 220Ω between OUT+ and OUT-, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.)
(Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range VCC Guaranteed by PSRR 7.5 8.5 10.0 V
Quiescent Supply Current ICC No load 64 112 mA
Voltage Gain AVVIN = 1.2VP-P (Note 4) 1.8 2 2.2 V/V
Input-Voltage Swing VIN Guaranteed by AV1.2 VP-P
Input Clamp Voltage VCLMP (Note 5) 3.46 V
Input Clamp Current ICLMP (Note 5) 7 13 µA
Input Resistance RIN (Notes 5, 6) 500 kΩ
Output Common-Mode Voltage VCOM 3.0 3.25 3.4 V
Output Impedance ROUT 0.1 Ω
Output Fault Current IF(OUT)
OUT+ and/or OUT- to +16V 9
mA
OUT+ and/or OUT- to + (VCC - 2V) 2
OUT+ and/or OUT- to +2V 4
OUT+ and/or OUT- to -2V 7
OUT+ and/or OUT- to +16V, VCC
unconnected 6
OUT+ or OUT- to -2V, VCC unconnected 24
Power-Supply Rejection Ratio PSRR VCC from 7.5V to
10V (Note 7)
Differential mode 45 62 dB
Common mode 46 52
FAULT Output Logic Level VOL, ISINK = 1.6mA (Note 8) 0.4 V
FAULT Output Leakage Current 0.01 µA
MAX9546/MAX9547 Differential Video Interface Chipset
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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.
DC Electrical Characteristics–MAX9546
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, VCC 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 four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
(VCC = +8.5V, RL = 220Ω across OUT+ and OUT-, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.)
(Note 3)
(VCC = +8.5V, GND = 0V, RL = 75Ω, ZZT = 75Ω, TA = -40°C to +85°C. Typical values are at TA = +25°C.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Large-Signal Bandwidth VIN = 1VP-P, -3dB 18 MHz
Large-Signal Flatness VIN = 1VP-P, ±0.5dB 15 MHz
Slew Rate SR OUT+ - OUT- 70 V/µs
Settling Time (0.1%) tSETTLING VIN = 1VP-P 400 ns
Power-Supply Rejection Ratio PSRR f = 100kHz, 100mVP-P ripple 63 dB
Common-Mode Balance
(Note 9) CMB f = 100kHz 55 dB
f = 3.58MHz 39
Droop Guaranteed by input current 1 %
Differential Gain DG (Note 10) 1.37 %
Differential Phase DP (Note 10) 0.14 degrees
SNR (dBRMS) SNR (Note 10) -62 dB
2T Pulse to Bar Rating (Note 10) -0.22 %KF
2T Pulse Response (Note 10) 0.30 %KF
Group Delay D/dt At 3.58MHz (Note 10) 2.20 ns
Horizontal Tilt (Notes 10, 15) 0 %
Vertical Tilt (Notes 10, 15) 6.62 %
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range VCC Guaranteed by PSRR 7.5 8.5 10.0 V
Supply Current ICC 70 110 mA
Differential Input Voltage Range
|IN+ - IN-| VIN(P-P) Guaranteed by CMRR (Note 11) 1.2 VP-P
Common-Mode Input Voltage
Range VCOM Guaranteed by CMRR (Note 11) 1.0 5.4 V
Input Current IIN 6 30 µA
Input Offset Current ∆IIN 1 4.2 µA
Input Resistance RIN Differential 80 kΩ
Voltage Gain AVVIN(P-P) = 1.2V, dened as IOUT x (RL / VIN) 0.90 1 1.15 V/V
Output Voltage VOB IN+ = IN- = 3.2V 1 V
Output Voltage Swing VOUT 1.2 VP-P
Maximum Output Current IOUT VIN = 1V, ZZT = 0 21 mA
Power-Supply Rejection Ratio PSRR VCC from 7.5V to 10V 26 34 dB
Common-Mode Rejection Ratio CMRR 1V ≤ VCOM ≤ 5.4V 42 54 dB
2V ≤ VCOM ≤ 4.4V 46 70
MAX9546/MAX9547 Differential Video Interface Chipset
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DC Electrical Characteristics–MAX9547
AC Electrical Characteristics–MAX9546
(VCC = +8.5V, GND = 0V, RL = 75Ω, ZZT = 75Ω, TA = -40°C to +85°C. Typical values are at TA = +25°C.) (Note 3)
(VCC = +8.5V, GND = 0V, RL = 75Ω, ZZT = 75Ω, CL = 50pF, TA = -40°C to +85°C, Typical values are at TA = +25°C.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LOS Logic Level VOL, ISINK = 1.6mA (Note 12) 0.4 V
LOS Leakage Current 0.01 µA
Input Fault Current IF
IN+ and/or IN- to +16V, RT1 + RT2 = 110Ω 50
mA
IN+ and/or IN- to -2V, RT1 + RT2 = 110Ω 10
IN+ and/or IN- to +16V, VCC unconnected,
RT1 + RT2 = 110Ω 72
IN+ and/or IN- to -2V, VCC unconnected,
RT1 + RT2 = 110Ω 10
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Large-Signal Bandwidth VIN = 1VP-P, -3dB 20 MHz
Large-Signal Flatness VIN = 1VP-P, ±0.5dB 15 MHz
Slew Rate SR 50 V/µs
Settling Time (0.1%) tSETTLING 400 ns
Power-Supply Rejection Ratio PSRR f = 100kHz, 100mVP-P ripple 30 dB
Common-Mode Rejection Ratio CMRR f = 100kHz, 100mVP-P ripple 53 dB
LOS Timeout Period tLOS 760 µs
Differential Gain DG (Notes 13, 14) 2.65 %
Differential Phase DP (Notes 13, 14) 0.57 degrees
SNR (dBRMS) SNR (Notes 13, 14) -72 dB
2T Pulse to Bar Rating (Notes 13, 14) -0.06 %KF
2T Pulse Response (Notes 13, 14) 0.40 %KF
Group Delay D/dt At 3.58MHz (Notes 13, 14) 0 ns
Horizontal Tilt (Notes 13, 14, 15) 0.10 %
Vertical Tilt (Notes 13, 14, 15) 1.16 %
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DC Electrical Characteristics–MAX9547 (continued)
AC Electrical Characteristics–MAX9547
(VCC = +8.5V, RL = 220Ω across OUT+ and OUT-, RL = 75Ω (MAX9547), ZZT = 75Ω, TA = -40°C to +85°C. Typical values are at TA
= +25°C, unless otherwise noted.) (Note 3)
Note 3: All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
Note 4: Defined as differential output to single-ended input.
Note 5: Input is AC-coupled.
Note 6: The RC time constant (3Hz) formed by the source resistance (RS) and coupling capacitor (CIN) is usually used for lead
compensation of the active clamp. The source resistance is 400Ω max. The clamp should remain stable in this condition.
Note 7: Differential mode is measured as (OUT+ - OUT-). Common mode is measured as OUT+ + OUT-
2
Note 8:
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 9: Common-mode balance is measured as 20log((OUT+ - OUT-) / (OUT+ + OUT-)).
2
Note 10: These results were measured with a MAX4144 receiver, other receivers may affect results.
Note 11: Ground between MAX9546 and MAX9547 can be a ±2V difference.
Note 12: 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.
Note 13: These results were measured with a MAX4447 transmitter and a MAX4012 buffer amplifier with a gain of 4. Using other
devices may affect results.
Note 14: MAX9547 topology shown in Figure 3.
Note 15: Input capacitor for this test is 0.33µF.
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,
VIN = 1VP-P 80 dB
2T Pulse-to-Bar Rating
2T = 250ns, bar time is 18µs, 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
Horizontal Tilt (Note 15) 0.12 %
Vertical Tilt (Note 15) 0.26 %
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AC ELECTRICAL CHARACTERISTICS—MAX9546 Driving MAX9547
(VCC = +8.5V, RL = 220Ω between OUT+ and OUT-, RL = 75Ω (MAX9547), ZZT = 75Ω, TA = +25°C, unless otherwise noted.)
GAIN vs. TEMPERATURE
MAX9546 toc02
TEMPERATURE (°C)
GAIN (dB)
6035-10-15
-1
0
1
2
3
4
5
6
7
8
-2
-40 85
MAX9546
VIN = 1VP-P
MAX9547
MAX9547 IOUT CURRENT vs. TEMPERATURE
MAX9546 toc03
TEMPERATURE (°C)
I
IOUT
(mA)
603510-15
17
19
21
23
25
15
-40 85
MAX9547 COMMON-MODE REJECTION
RATIO vs. FREQUENCY
MAX9546 toc04
FREQUENCY (MHz)
CMRR (dB)
10.10.001 0.01
-70
-60
-50
-40
-30
-20
-10
0
-80
0.0001 10
VRIPPLE = 100mVP-P
MAX9547 COMMON-MODE REJECTION
RATIO vs. TEMPERATURE
MAX9546 toc05
TEMPERATURE (°C)
CMRR (dB)
6035-15 10
-70
-60
-50
-40
-30
-20
-10
0
-80
-40 85
VCOM = 2V
VCOM = 5.4V
VRIPPLE = 100mVP-P
fRIPPLE = 10kHz
MAX9546 INPUT CLAMP CURRENT
vs. TEMPERATURE
MAX9546 toc06
TEMPERATURE (°C)
I
CLMP
(µA)
603510-15
6
7
8
9
10
5
-40 85
MAX9547 DIFFERENTIAL INPUT
RESISTANCE vs. TEMPERATURE
MAX9546 toc07
TEMPERATURE (°C)
DIFFERENTIAL RIN (kΩ)
603510-15
20
40
60
80
100
120
140
160
180
200
0
-40 85
GAIN vs. FREQUENCY
MAX9546 toc01
FREQUENCY (MHz)
GAIN (dB)
10.10.01
-20
-10
0
10
20
-30
0.001 10
MAX9546
MAX9547
MAX9546 DIFFERENTIAL OUTPUT
RESISTANCE vs. TEMPERATURE
MAX9546 toc08
TEMPERATURE (°C)
DIFFERENTIAL ROUT (mΩ)
603510-15
20
40
60
80
100
120
140
160
180
200
0
-40 85
MAX9546/MAX9547 Differential Video Interface Chipset
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Typical Operating Characteristics
(VCC = +8.5V, RL = 220Ω between OUT+ and OUT-, RL = 75Ω (MAX9547), ZZT = 75Ω, TA = +25°C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9546 toc09
FREQUENCY (MHz)
PSRR (dB)
10.10.001 0.01
-70
-60
-50
-40
-30
-20
-10
0
-80
0.0001 10
VRIPPLE = 100mVP-P
MAX9547
MAX9546
POWER-SUPPLY REJECTION RATIO
vs. TEMPERATURE
MAX9546 toc10
TEMPERATURE (°C)
PSRR (dB)
6035-15 10
-70
-60
-50
-40
-30
-20
-10
0
-80
-40 85
VRIPPLE = 100mVP-P
fRIPPLE = 100kHz
MAX9547
MAX9546
MAX9546 COMMON-MODE BALANCE
vs. FREQUENCY
MAX9546 toc11
COMMON-MODE BALANCE (dB)
-40
-30
-20
-10
0
-50
0.001 0.01
FREQUENCY (MHz)
0.1 1 10
DIFFERENTIAL GAIN (MAX9546 DRIVING MAX9547)
DIFFERENTIAL PHASE (MAX9546 DRIVING MAX9547)
MAX9546 toc12
21 3 4 5 6
21 3 4 5 6
4
5
0.6
1.0
0.2
-0.2
-0.6
-1.0
3
2
DIFFERENTIAL GAIN (%)DIFFERENTIAL PHASE (deg)
1
0
-1
-2
-3
GROUP DELAY vs. FREQUENCY
(MAX9546 DRIVING MAX9547)
MAX9546 toc13
FREQUENCY (MHz)
GROUP DELAY (ns)
1
0
10
20
30
40
50
-10
0.1 10
OUTPUT RESPONSE TO NTC-7
VIDEO TEST SIGNAL (MAX9546 DRIVING MAX9547)
MAX9546 toc14
10µs/div
MAX9546
INPUT
500mV/div
MAX9547
OUTPUT
500mV/div
SIGNAL-TO-NOISE RATIO vs. FREQUENCY
(MAX9546 DRIVING MAX9547)
MAX9546 toc15
FREQUENCY (MHz)
SNR (dB)
1
110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-120
0.1 10
MAX9546/MAX9547 Differential Video Interface Chipset
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Typical Operating Characteristics (continued)
Detailed Description
The MAX9546/MAX9547 differential interface chipset
converts single-ended voltages to differential voltages for
transport and then converts back to single-ended voltag-
es. The chipset is optimized for transporting CVBS/FBAS
analog video signals (PAL or NTSC) through hostile envi-
ronments. The MAX9546 driver includes a fault output
(FAULT) that indicates shorted transmission cables. The
MAX9547 receiver loss-of-signal output (LOS) indicates
an absence of input signal.
The MAX9546/MAX9547 operate from a 7.5V to 10V
single supply. The differential interface is immune to short-
circuit conditions to supply (VCC), or ground. These devic-
es include ±15kV ESD (Human Body Model) protection.
MAX9546
Driver
The MAX9546 driver converts a single-ended video input
into a differential output for transport across a twisted pair
of wires. The input is AC-coupled and the video signal
sync tip is clamped at 3.46V to set the voltage of the input.
The output common-mode voltage is optimized to reject
ground differences between the MAX9546 and MAX9547
up to ±2V. The differential gain is internally set to 2V/V to
drive a back-terminated output to unity gain. The maxi-
mum input resistance should not exceed 400Ω to ensure
device stability.
PIN NAME FUNCTION
1, 8 VCC Power Supply. Connect together and bypass with a 0.1µF in parallel with a 4.7µF capacitor to GND.
2 IN Video Input
3FAULT Fault Indicator. Active-low, open-drain output. FAULT = low when fault is detected at the output.
FAULT = high when no fault is detected at the output.
4, 5 GND Ground
6 OUT- Negative Differential Output
7 OUT+ Positive Differential Output
EP EP Exposed Paddle. Connect to GND.
PIN NAME FUNCTION
1 IN+ Positive Differential Input
2 ZT+ Positive Transconductance Terminal
3ZT- Negative Transconductance Terminal
4 IN- Negative Differential Input
5 GND Ground
6LOS Loss-of-Signal Indicator. Active-low, open-drain output. LOS = low when no signal is detected at the
input. LOS = high when signal is present at the input.
7 IOUT Current Output
8 VCC Power Supply. Bypass with a 0.1µF capacitor in parallel with a 4.7µF capacitor to GND.
EP EP Exposed Paddle. Connect to GND.
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Pin Description (MAX9546)
Pin Description (MAX9547)
Common-Mode Balance
A driver is typically specified as having a property called
common-mode balance (CMB), longitudinal balance, or
simply line imbalance. Although balance is associated
with the source, it assumes a perfectly balanced, correctly
terminated, differential load. Common-mode balance
is a measure of the ratio between the differential to the
common-mode output in decibels as shown below.
( ) ( )
( ) ( )
OUT OUT
CMB 20Log OUT OUT
2


+− −

=++ −



Common-mode balance is dominated by the gain-band-
width product at high frequencies and the output resis-
tance at low frequencies; therefore, it is important to
specify CMB over a frequency range. The receiver-side
balance is determined by the common-mode rejection
ratio (CMRR). The CMRR is usually quite large compared
to the CMB; therefore, the CMB is the limiting factor.
Fault Protection and Detection
The MAX9546 fault protection insures the driver outputs
survive a short to any voltage from -2V to +16V and are
ESD-protected to ±15kV HBM. Faults are indicated by an
open-drain fault output (FAULT) being asserted low and
requires a pullup resistor from FAULT to VCC.
MAX9547
Receiver
The MAX9547 receiver is a differential-to-single-ended con-
verter that removes any common-mode input. The unique
architecture allows the signal gain to be set by a ratio of
two impedances: the user-selected transconductance ele-
ment or network (ZZT), and an output load resistance, RL.
The gain is set by a fixed internal current gain (K) and the
ratio of ZZT and RL. The ZT terminals can be bridged with
a complex impedance to provide lead-lag compensation.
The output is essentially a voltage-controlled current source
as shown in Figure 1. The MAX9547 output is a current
proportional to the differential input voltage, and inversely
proportional to the impedance of the user-selected trans-
conductance network, ZZT. The current output provides
inherent short-circuit protection for the output terminal.
A differential input voltage applied to the input terminals
causes current to flow in the transconductance element
(ZZT), which is equal to VIN/ZZT. This current in the trans-
conductance element is multiplied by the preset current
gain (K) and appears on the output terminal as a current
equal to (K) x (VIN/ZZT). This current flows through the load
impedance to produce an output voltage according to the
following equation:
IN
OUT L
ZT
V
VK R
Z

=

where K = current-gain ratio (K = 1 for MAX9547), RL =
output load impedance, ZZT = transconductance element
impedance, VIN = differential input voltage.
Loss-of-Signal
The receiver includes an LOS output to indicate a signal
by detecting the presence of H-Sync. This allows the
MAX9547 to be used with monochrome or color video.
LOS is an open-drain output and requires a pullup resistor
from LOS to VCC.
Setting the Circuit Gain
The MAX9547 produces an output current by multiplying
the differential input voltage, VIN, by the transconduc-
tance ratio, K (RL / ZZT), where K = 1. The voltage gain
(AV) is set by the impedance of the transconductance net-
work (ZZT) and the output load impedance (RL) according
to the following formula:
L
V
ZT
R
AK
Z

=

The factor ZZT is the impedance of the user-selected, two-
terminal transconductance element or network, connected
across the terminals labeled ZT+ and ZT-. The network
ZZT is selected, along with the output impedance RL, to
provide the desired circuit gain and frequency shaping.
To maintain linearity, the transconductance network should
also be selected so that current flowing through it, equal
to VIN / ZZT, does not exceed 18mA under worst-case
conditions of maximum input voltage and minimum trans-
conductance element impedance (ZZT). Output current
should not exceed ±8.8mA except under fault conditions.
Figure 1. Operational Mode
ZZT
K
VIN
VIN
IN+
IN-
IOUT
1
+
7
-
4
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Applications Information
Differential Interface
The impedances of the differential interface are made
up of the two source resistors on the driver (MAX9546)
shown as RS and the load resistors on the receiver
(MAX9547) shown as RT in the Typical Application
Circuit. These resistors are chosen so their sum matches
the characteristic impedance (Z0) of the differential trans-
mission line. For example, a Category 5 cable has a char-
acteristic impedance of 110Ω, so the sum of the two RS
or RT resistors must be 110Ω to correctly drive the line.
To balance the signals they must be equal, so RS and RT
are 55Ω each.
Using Other Transmitters
and Receivers
The MAX9546/MAX9547 are used with other transmit-
ters and receivers; either other MAXIM devices or other
brands entirely. The overall performance of the MAX9546/
MAX9547 is dependent on the choice of the receiver or
transmitter, respectively.
Figure 2 illustrates one possible topology for the MAX9546
when using other devices with different offset require-
ments. Figures 3 and 4 illustrate two possible topologies
for the MAX9547 when using other devices with unknown
or different offset requirements. The circuit shown in
Figure 3 has a smaller PCB footprint at the expense
of requiring higher DC offset currents from the source
device. Figure 4 requires no DC offset currents although
it has a larger PCB footprint.
When using the MAX9546 with AC-coupling capacitors,
the FAULT signal will continue to function but only with
respect to a DC short condition. The LOS signal from the
MAX9547 is unaffected by coupling capacitors.
Figure 2. Suggested MAX9546 Configuration for Use with Other Devices
0V OFFSET
+3.2 VDC OFFSET
+3.2 VDC OFFSET
TO A DEVICE
OTHER THAN A
MAX9547 USING
CAT5, ETC.
VCC
GND
1
4
IN
D1
2
7
6
VCC
8
FAULT OUT+
OUT-
3
C4
0.33µF
R1
3.92kΩ
R4
75Ω
R2
55Ω
R3
55Ω
C3
470µF
C5
470µF
GND
5
MAX9546
U1
4.7µF 0.1µF
V
DD
MAX9546/MAX9547 Differential Video Interface Chipset
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Figure 3. Suggested MAX9547 Configuration When Using Other Devices
0V OFFSET
0V OFFSET
OPTIONAL EQ NETWORK
FOR LONG CABLE RUNS
+3.2 VDC OFFSET
TO A DEVICE
OTHER THAN A
MAX9546 USING
CAT5, ETC.
10µF 0.1µF
3.2V LOW-NOISE REFERENCE
ZTP VCC
GND
2
8
5
IP
1
6
7
ZTN LOS
IOUT
3
IN
4
C3
22µF
75Ω
Zt
R3
10kΩ
R6
10kΩ
C4
22µF
R4
110Ω
MAX9547
U1
4.7µF
3.92k
Ω
75
Ω
D1
LED
+8V
0.1µF
MAX9546/MAX9547 Differential Video Interface Chipset
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Figure 4. Alternate MAX9547 Configuration for Use with Other Devices
0V OFFSET
0V OFFSET
OPTIONAL EQ NETWORK
FOR LONG CABLE RUNS
+3.2 VDC OFFSET
TO A DEVICE
OTHER THAN A
MAX9546 USING
CAT5, ETC.
100µF 0.1µF
3.2V LOW-NOISE REFERENCE
ZTP VCC
GND
2
8
5
IP
1
6
7
ZTN LOS
IOUT
3
IN
4
C3
470µF
75Ω
Zt
R3
51Ω
R805
R5
51Ω
R805
C4
470µF
MAX9547
U1
4.7µF
3.92k
Ω
75
Ω
D1
LED
+8V
0.1µF
MAX9546/MAX9547 Differential Video Interface Chipset
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±15kV ESD Protection
As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic
discharges encountered during handling and assem-
bly. The driver outputs and receiver inputs have extra
protection against static electricity. Maxim’s engineers
developed state-of-the-art structures to protect these pins
against ESD of ±15kV without damage. The ESD struc-
tures withstand high ESD in all states: normal operation
and powered down. After an ESD event, the MAX9546/
MAX9547 keep working without latchup. ESD protection
can be tested in various ways; the driver outputs and
receiver inputs of this product family are characterized for
protection to ±15kV using the Human Body Model. Other
ESD test methodologies include IEC 1000-4-2 Contact
Discharge and IEC 1000-4-2 Air-Gap Discharge (formerly
IEC 801-2).
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
setup, test methodology, and test results.
Human Body Model
Figure 5 shows the Human Body Model, and Figure
6 shows the current waveform it generates when dis-
charged into a low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.5kΩ resistor.
Figure 5. Human Body ESD Test Model Figure 6. Human Body Current Waveform
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
RC
1MΩ
RD
1.5kΩ
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
IP 100%
90%
36.8%
tRL TIME
tDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
10%
0
0
AMPERES
MAX9546/MAX9547 Differential Video Interface Chipset
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IEC 1000-4-2
The IEC 1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits (Figure 7).
The major difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak
current in IEC 1000-4-2, because series resistance is
lower in the IEC 1000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC 1000-4-2 is generally
lower than that measured using the Human Body Model.
Figure 8 shows the current waveform for the ±8kV IEC
1000-4-2 ESD Contact-Discharge test. The Air-Gap test
involves approaching the device with a charged probe.
The Contact-Discharge method connects the probe to the
device before the probe is energized.
Figure 7.IEC 1000-4-2 ESD Test Model
Figure 8. IEC 1000-4-2 ESD Generator Current Waveform
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
150pF
RC
50Ω to 100Ω
RD
330W
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
I
100%
90%
10%
tr = 0.7ns TO 1ns
IPEAK
60ns
30ns
t
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FAULT
4.7kΩ
75Ω
75Ω
AC
OUT-
OUT+
VCC
7.5V TO 10V
NOTE: TYPICAL APPLICATION CIRCUIT FOR 110Ω UNSHIELDED (UTP) CABLE
WITH AN OVERALL UNITY GAIN IN A 75Ω VIDEO APPLICATION.
4.7µF
0.1µF
GND1 GND2
VCC
GND
GND1
GND1
GND1
GND
IN+
IOUT
VOUT
IN-
CT
1µF TO 47µF
RT1
55Ω
RT2
55Ω
IN
CIN
0.33µF
RS
55Ω
RS
55Ω
MAX9546
LOS
VCC
7.5V TO 10V
4.7µF
0.1µF
GND GND2
GND2
GND2
MAX9547
4.7kΩ
RL
75Ω
ZZT
75Ω
ZT+
ZT-
OUT-
GNDGND
1
2
8
7
VCC
OUT+IN
FAULT
VCC
SO-EP
TOP VIEW
3
4
6
5
MAX9546
+
LOS
GNDIN-
1
2
8
7
VCC
IOUTZT+
ZT-
IN+
SO-EP
3
4
6
5
MAX9547
+
MAX9546/MAX9547 Differential Video Interface Chipset
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Typical Application Circuit
Pin Congurations
Chip Information
PROCESS: BiCMOS
PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
8 SO-EP S8E+14 21-0111 90-0151
MAX9546/MAX9547 Differential Video Interface Chipset
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Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
4 9/14 Removed automotive references from Applications and Detailed Description
sections 1, 8
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
MAX9546/MAX9547 Differential Video Interface Chipset
© 2014 Maxim Integrated Products, Inc.
│
17
Revision History
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.