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MAX9546ESA+
Differential Video Interface Chipset
General DescriptionThe 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.
Note: These devices are specified for -40°C to +85°C tempera-ture range.
+Denotes a lead-free package.
*EP = Exposed paddle.
PARTPIN-
PACKAGEPKG CODEDESCRIPTION
MAX9546ESA+8 SO-EP*S8E-14Driver
MAX9547ESA+8 SO-EP*S8E-14Receiver
FAULT
OUT-
CLAMP
OUT+
VCCVCC
ZT+
ZT-
IN+
IOUTVOUT
LOS
IN-
MAX9547MAX9546
MAX9546/MAX9547Differential 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) ....1951.2mWθJC (Note 2) ...................................................................7.0°C/WθJA ................................................................................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)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply Voltage RangeVCCGuaranteed by PSRR7.58.510.0V
Quiescent Supply CurrentICCNo load64112mA
Voltage GainAVVIN = 1.2VP-P (Note 4)1.822.2V/V
Input-Voltage SwingVINGuaranteed by AV1.2VP-P
Input Clamp VoltageVCLMP(Note 5)3.46V
Input Clamp Current ICLMP(Note 5)713µA
Input ResistanceRIN(Notes 5, 6)500kΩ
Output Common-Mode VoltageVCOM3.03.253.4V
Output ImpedanceROUT0.1Ω
Output Fault Current IF(OUT)
OUT+ and/or OUT- to +16V9
OUT+ and/or OUT- to + (VCC - 2V)2
OUT+ and/or OUT- to +2V4
OUT+ and/or OUT- to -2V7
OUT+ and/or OUT- to +16V, VCC
unconnected6
OUT+ or OUT- to -2V, VCC unconnected24
Power-Supply Rejection RatioPSRRVCC from 7.5V to
10V (Note 7)
Differential mode4562dBCommon mode4652
FAULT Output Logic LevelVOL, ISINK = 1.6mA (Note 8)0.4V
FAULT Output Leakage Current0.01µA
MAX9546/MAX9547Differential Video Interface Chipset
Absolute Maximum RatingsStresses 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)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSLarge-Signal BandwidthVIN = 1VP-P, -3dB18MHz
Large-Signal FlatnessVIN = 1VP-P, ±0.5dB15MHz
Slew RateSROUT+ - OUT-70V/µs
Settling Time (0.1%)tSETTLINGVIN = 1VP-P400ns
Power-Supply Rejection RatioPSRRf = 100kHz, 100mVP-P ripple63dB
Common-Mode Balance
(Note 9)CMBf = 100kHz55dBf = 3.58MHz39
DroopGuaranteed by input current1%
Differential GainDG(Note 10) 1.37%
Differential PhaseDP(Note 10)0.14degrees
SNR (dBRMS)SNR(Note 10)-62dB
2T Pulse to Bar Rating(Note 10)-0.22%KF
2T Pulse Response(Note 10)0.30%KF
Group DelayD/dtAt 3.58MHz (Note 10)2.20ns
Horizontal Tilt(Notes 10, 15)0%
Vertical Tilt(Notes 10, 15)6.62%
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply Voltage Range VCCGuaranteed by PSRR7.58.510.0V
Supply CurrentICC70110mA
Differential Input Voltage Range
|IN+ - IN-|VIN(P-P)Guaranteed by CMRR (Note 11)1.2VP-P
Common-Mode Input Voltage
RangeVCOMGuaranteed by CMRR (Note 11)1.05.4V
Input Current IIN630µA
Input Offset Current∆IIN14.2µA
Input ResistanceRINDifferential80kΩ
Voltage GainAVVIN(P-P) = 1.2V, deined as IOUT x (RL / VIN)0.9011.15V/V
Output VoltageVOBIN+ = IN- = 3.2V1V
Output Voltage SwingVOUT1.2VP-P
Maximum Output CurrentIOUTVIN = 1V, ZZT = 021mA
Power-Supply Rejection RatioPSRRVCC from 7.5V to 10V2634dB
Common-Mode Rejection RatioCMRR1V ≤ VCOM ≤ 5.4V4254dB2V ≤ VCOM ≤ 4.4V4670
MAX9546/MAX9547Differential Video Interface Chipset
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)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSLOS Logic LevelVOL, ISINK = 1.6mA (Note 12)0.4V
LOS Leakage Current0.01µA
Input Fault CurrentIF
IN+ and/or IN- to +16V, RT1 + RT2 = 110Ω50
IN+ and/or IN- to -2V, RT1 + RT2 = 110Ω10
IN+ and/or IN- to +16V, VCC unconnected,
RT1 + RT2 = 110Ω72
IN+ and/or IN- to -2V, VCC unconnected,
RT1 + RT2 = 110Ω10
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSLarge-Signal BandwidthVIN = 1VP-P, -3dB20MHz
Large-Signal FlatnessVIN = 1VP-P, ±0.5dB15MHz
Slew RateSR50V/µs
Settling Time (0.1%)tSETTLING400ns
Power-Supply Rejection RatioPSRRf = 100kHz, 100mVP-P ripple30dB
Common-Mode Rejection RatioCMRRf = 100kHz, 100mVP-P ripple53dB
LOS Timeout PeriodtLOS760µs
Differential GainDG(Notes 13, 14)2.65%
Differential PhaseDP(Notes 13, 14)0.57degrees
SNR (dBRMS)SNR(Notes 13, 14)-72dB
2T Pulse to Bar Rating(Notes 13, 14)-0.06%KF
2T Pulse Response(Notes 13, 14)0.40%KF
Group DelayD/dtAt 3.58MHz (Notes 13, 14)0ns
Horizontal Tilt(Notes 13, 14, 15)0.10%
Vertical Tilt(Notes 13, 14, 15)1.16%
MAX9546/MAX9547Differential Video Interface Chipset
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.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSDifferential GainDG3.8%
Differential PhaseDP0.6degrees
Signal-to-Noise RatioSNR5MHz lowpass, 100kHz highpass,
VIN = 1VP-P80dB
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 Response2T = 250ns0.25%
Group DelayD/dtAt 3.58MHz10ns
Horizontal Tilt(Note 15)0.12%
Vertical Tilt(Note 15)0.26%
MAX9546/MAX9547Differential Video Interface Chipset
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. TEMPERATUREMAX9546 toc02
TEMPERATURE (°C)
GAIN (dB)35-10-15
MAX9546
VIN = 1VP-P
MAX9547
MAX9547 IOUT CURRENT vs. TEMPERATUREMAX9546 toc03
TEMPERATURE (°C)
IIOUT
(mA)3510-15
MAX9547 COMMON-MODE REJECTION
RATIO vs. FREQUENCY
MAX9546 toc04
FREQUENCY (MHz)
CMRR (dB)0.10.0010.01
VRIPPLE = 100mVP-P
MAX9547 COMMON-MODE REJECTION
RATIO vs. TEMPERATUREMAX9546 toc05
TEMPERATURE (°C)
CMRR (dB)35-1510
VCOM = 2V
VCOM = 5.4V
VRIPPLE = 100mVP-P
fRIPPLE = 10kHz
MAX9546 INPUT CLAMP CURRENT
vs. TEMPERATUREMAX9546 toc06
TEMPERATURE (°C)
ICLMP
(µA)3510-15
MAX9547 DIFFERENTIAL INPUT
RESISTANCE vs. TEMPERATURE
MAX9546 toc07
DIFFERENTIAL R
(k3510-15
GAIN vs. FREQUENCY
MAX9546 toc01
FREQUENCY (MHz)
GAIN (dB)0.10.01
MAX9546
MAX9547
MAX9546 DIFFERENTIAL OUTPUT
RESISTANCE vs. TEMPERATUREMAX9546 toc08
DIFFERENTIAL R
OUT
(m3510-15
MAX9546/MAX9547Differential Video Interface Chipset
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. FREQUENCYMAX9546 toc09
FREQUENCY (MHz)
PSRR (dB)0.10.0010.01
VRIPPLE = 100mVP-P
MAX9547
MAX9546
POWER-SUPPLY REJECTION RATIO
vs. TEMPERATUREMAX9546 toc10
TEMPERATURE (°C)
PSRR (dB)35-1510
VRIPPLE = 100mVP-P
fRIPPLE = 100kHz
MAX9547
MAX9546
MAX9546 COMMON-MODE BALANCE
vs. FREQUENCYMAX9546 toc11
COMMON-MODE BALANCE (dB)
FREQUENCY (MHz)
DIFFERENTIAL GAIN (MAX9546 DRIVING MAX9547)
DIFFERENTIAL PHASE (MAX9546 DRIVING MAX9547)
MAX9546 toc121345613456
DIFFERENTIAL GAIN (%)
DIFFERENTIAL PHASE (deg)
GROUP DELAY vs. FREQUENCY
(MAX9546 DRIVING MAX9547)MAX9546 toc13
FREQUENCY (MHz)
GROUP DELAY (ns)
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
SNR (dB)
MAX9546/MAX9547Differential Video Interface Chipset
Typical Operating Characteristics (continued)
Detailed DescriptionThe 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
DriverThe 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.
PINNAMEFUNCTION1, 8VCCPower Supply. Connect together and bypass with a 0.1µF in parallel with a 4.7µF capacitor to GND.INVideo InputFAULTFault 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, 5GNDGroundOUT-Negative Differential OutputOUT+Positive Differential OutputEPExposed Paddle. Connect to GND.
PINNAMEFUNCTIONIN+Positive Differential InputZT+Positive Transconductance TerminalZT-Negative Transconductance TerminalIN-Negative Differential InputGNDGroundLOSLoss-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.IOUTCurrent OutputVCCPower Supply. Bypass with a 0.1µF capacitor in parallel with a 4.7µF capacitor to GND.EPExposed Paddle. Connect to GND.
MAX9546/MAX9547Differential Video Interface Chipset
Pin Description (MAX9546)
Pin Description (MAX9547)
Common-Mode BalanceA 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.()()()()
OUTOUTCMB20LogOUTOUT+−−=++−
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 DetectionThe 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
ReceiverThe 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 OUTLVKRZ=
where K = current-gain ratio (K = 1 for MAX9547), RL =
output load impedance, ZZT = transconductance element
impedance, VIN = differential input voltage.
Loss-of-SignalThe 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 GainThe 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:VZTAKZ=
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
ZZTVIN
VIN
IN+
IN-
IOUT
MAX9546/MAX9547Differential Video Interface Chipset
