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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 voltages. These devices eliminate costly, bulky, singleended coaxial cables with inexpensive, readily available, differential 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 manufacturing stage and troubleshooting equipment at repair facilities. The MAX9546/MAX9547 are low-cost, convenient 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 backterminated, DC-coupled differential video output to unity gain. This DC connection allows the detection of a shortcircuit 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 -40C to +85C extended temperature 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+ PINPACKAGE 8 SO-EP* 8 SO-EP* PKG CODE S8E-14 S8E-14 DESCRIPTION Driver Receiver
Note: These devices are specified for -40C to +85C temperature range. +Denotes a lead-free package. *EP = Exposed paddle.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
VCC VCC
Applications
Automotive Video Car Navigation In-Car Entertainment Collision Avoidance/Rearview Cameras Security/CCTV Video Avionics/In-Flight Entertainment
CLAMP FAULT LOS IN OUTINZT+
MAX9546
ZTOUT+ IN+
MAX9547
IOUT
VOUT
________________________________________________________________ Maxim Integrated Products
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Differential Video Interface Chipset MAX9546/MAX9547
ABSOLUTE MAXIMUM RATINGS
(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 = +70C) 8-Pin SO-EP (derate 24.4mW/C above +70C) ......1951.2mW JC (Note 2).....................................................................7.0C/W JA .................................................................................41.0C/W Operating Temperature Range ...........................-40C to +85C Junction Temperature ..................................................... +150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 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
(VCC = +8.5V, RL = 220 between OUT+ and OUT-, TA = -40C to +85C. Typical values are at TA = +25C, 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 VCC ICC AV VIN VCLMP ICLMP RIN VCOM ROUT OUT+ and/or OUT- to +16V OUT+ and/or OUT- to + (VCC - 2V) OUT+ and/or OUT- to +2V Output Fault Current IF(OUT) OUT+ and/or OUT- to -2V OUT+ and/or OUT- to +16V, VCC unconnected OUT+ or OUT- to -2V, VCC unconnected Power-Supply Rejection Ratio FAULT Output Logic Level FAULT Output Leakage Current PSRR VCC from 7.5V to 10V (Note 7) Differential mode Common mode 45 46 No load VIN = 1.2VP-P (Note 4) Guaranteed by AV (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 A 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 VP-P V A k V
VOL, ISINK = 1.6mA (Note 8)
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Differential Video Interface Chipset
AC ELECTRICAL CHARACTERISTICS--MAX9546
(VCC = +8.5V, RL = 220 across OUT+ and OUT-, TA = -40C to +85C. Typical values are at TA = +25C, 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 (dBRMS) 2T Pulse to Bar Rating 2T Pulse Response Group Delay Horizontal Tilt Vertical Tilt D/dt DG DP SNR SR SYMBOL CONDITIONS VIN = 1VP-P, -3dB VIN = 1VP-P, 0.5dB OUT+ - OUTtSETTLING VIN = 1VP-P PSRR CMB f = 100kHz, 100mVP-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/s ns dB dB % % degrees dB %KF %KF ns % %
MAX9546/MAX9547
DC ELECTRICAL CHARACTERISTICS--MAX9547
(VCC = +8.5V, GND = 0V, RL = 75, ZZT = 75, TA = -40C to +85C. Typical values are at TA = +25C.) (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 VCC ICC VIN(P-P) VCOM IIN IIN RIN AV VOB VOUT IOUT PSRR CMRR VIN = 1V, ZZT = 0 VCC from 7.5V to 10V 1V VCOM 5.4V 2V VCOM 4.4V 26 42 46 21 34 54 70 Differential VIN(P-P) = 1.2V, defined as IOUT x (RL / VIN) 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 VP-P V A A k V/V V VP-P mA dB dB
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Differential Video Interface Chipset MAX9546/MAX9547
DC ELECTRICAL CHARACTERISTICS--MAX9547 (continued)
(VCC = +8.5V, GND = 0V, RL = 75, ZZT = 75, TA = -40C to +85C. Typical values are at TA = +25C.) (Note 3)
PARAMETER LOS Logic Level LOS Leakage Current IN+ and/or IN- to +16V, RT1 + RT2 = 110 IN+ and/or IN- to -2V, RT1 + RT2 = 110 Input Fault Current IF IN+ and/or IN- to +16V, VCC unconnected, RT1 + RT2 = 110 IN+ and/or IN- to -2V, VCC unconnected, RT1 + RT2 = 110 SYMBOL CONDITIONS VOL, ISINK = 1.6mA (Note 12) 0.01 50 10 72 10 mA MIN TYP MAX 0.4 UNITS V A
AC ELECTRICAL CHARACTERISTICS--MAX9547
(VCC = +8.5V, GND = 0V, RL = 75, ZZT = 75, CL = 50pF, TA = -40C to +85C, Typical values are at TA = +25C.) (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 (dBRMS) 2T Pulse to Bar Rating 2T Pulse Response Group Delay Horizontal Tilt Vertical Tilt D/dt SR tSETTLING PSRR CMRR tLOS 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, 100mVP-P ripple f = 100kHz, 100mVP-P ripple SYMBOL CONDITIONS VIN = 1VP-P, -3dB VIN = 1VP-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/s ns dB dB s % degrees dB %KF %KF ns % %
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Differential Video Interface Chipset
AC ELECTRICAL CHARACTERISTICS--MAX9546 Driving MAX9547
(VCC = +8.5V, RL = 220 across OUT+ and OUT-, RL = 75 (MAX9547), ZZT = 75, TA = -40C to +85C. Typical values are at TA = +25C, unless otherwise noted.) (Note 3)
PARAMETER Differential Gain Differential Phase Signal-to-Noise Ratio SYMBOL DG DP SNR 5MHz lowpass, 100kHz highpass, VIN = 1VP-P 2T = 250ns, bar time is 18s, 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 TA = +25C. 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 (RS) and coupling capacitor (CIN) is usually used for lead compensation of the active clamp. The source resistance is 400 max. The clamp should remain stable in this condition. Differential mode is measured as (OUT+ - OUT-). Common mode is measured as OUT+ + OUT2 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 0.33F.
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Differential Video Interface Chipset MAX9546/MAX9547
Typical Operating Characteristics
(VCC = +8.5V, RL = 220 between OUT+ and OUT-, RL = 75 (MAX9547), ZZT = 75, TA = +25C, unless otherwise noted.)
GAIN vs. FREQUENCY
MAX9546 toc01
GAIN vs. TEMPERATURE
7 6 5 GAIN (dB) IIOUT (mA) VIN = 1VP-P
MAX9546 toc02
MAX9547 IOUT CURRENT vs. TEMPERATURE
MAX9546 toc03
20 MAX9546 10
8
25
23
GAIN (dB)
0 MAX9547 -10
4 3 2 1
MAX9546
21
MAX9547
19
-20
0 -1
17
-30 0.001
-2 0.01 0.1 FREQUENCY (MHz) 1 10 -40 -15 -10 35 60 85 TEMPERATURE (C)
15 -40 -15 10 35 60 85 TEMPERATURE (C)
MAX9547 COMMON-MODE REJECTION RATIO vs. FREQUENCY
MAX9546 toc04
MAX9547 COMMON-MODE REJECTION RATIO vs. TEMPERATURE
MAX9546 toc05
MAX9546 INPUT CLAMP CURRENT vs. TEMPERATURE
MAX9546 toc06
0 -10 -20 CMRR (dB) VRIPPLE = 100mVP-P
0 -10 -20 CMRR (dB) VRIPPLE = 100mVP-P fRIPPLE = 10kHz
10
9
ICLMP (A) 85
-30 -40 -50 -60 -70 -80 0.0001 0.001 0.01 0.1 1 10
-30 -40 -50 -60 -70 -80 -40 -15 10 35 60 TEMPERATURE (C) VCOM = 5.4V VCOM = 2V
8
7
6
5 -40
-15
10
35
60
85
FREQUENCY (MHz)
TEMPERATURE (C)
MAX9547 DIFFERENTIAL INPUT RESISTANCE vs. TEMPERATURE
MAX9546 toc07
MAX9546 DIFFERENTIAL OUTPUT RESISTANCE vs. TEMPERATURE
180 DIFFERENTIAL ROUT (m) 160 140 120 100 80 60 40 20 0
MAX9546 toc08
200 180 160 DIFFERENTIAL RIN (k) 140 120 100 80 60 40 20 0 -40 -15 10 35 60
200
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
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Differential Video Interface Chipset MAX9546/MAX9547
Typical Operating Characteristics (continued)
(VCC = +8.5V, RL = 220 between OUT+ and OUT-, RL = 75 (MAX9547), ZZT = 75, TA = +25C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
VRIPPLE = 100mVP-P -10 -20 PSRR (dB) PSRR (dB) -30 -40 -50 -60 -70 -80 0.0001 0.001 0.01 0.1 1 10 MAX9546 MAX9547
MAX9546 toc09
POWER-SUPPLY REJECTION RATIO vs. TEMPERATURE
-10 -20 -30 -40 -50 -60 -70 -80 -40 -15 10 35 60 85 MAX9546 MAX9547 VRIPPLE = 100mVP-P fRIPPLE = 100kHz
MAX9546 toc10
0
0
FREQUENCY (MHz)
TEMPERATURE (C)
DIFFERENTIAL GAIN (MAX9546 DRIVING MAX9547)
MAX9546 toc12
GROUP DELAY vs. FREQUENCY (MAX9546 DRIVING MAX9547)
MAX9546 toc13
GROUP DELAY (ns)
5 4 3 2 1 0 -1 -2 -3 1.0 0.6 0.2 -0.2 -0.6 -1.0
DIFFERENTIAL GAIN (%)
50 40 30 20 10 0 -10 0.1 1 2 3 4 5 6 1 FREQUENCY (MHz)
1
2
3
4
5
6
DIFFERENTIAL PHASE (MAX9546 DRIVING MAX9547)
DIFFERENTIAL PHASE (deg)
10
OUTPUT RESPONSE TO NTC-7 VIDEO TEST SIGNAL (MAX9546 DRIVING MAX9547)
MAX9546 toc14
SIGNAL-TO-NOISE RATIO vs. FREQUENCY (MAX9546 DRIVING MAX9547)
0 -10 -20 -30 -40 SNR (dB) -50 -60 -70 -80 -90 -100 110 -120 0.1 1 FREQUENCY (MHz) 10
MAX9546 toc15
MAX9546 INPUT 500mV/div
MAX9547 OUTPUT 500mV/div
10s/div
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Differential Video Interface Chipset MAX9546/MAX9547
Pin Description (MAX9546)
PIN 1, 8 2 3 4, 5 6 7 EP NAME VCC IN FAULT GND OUTOUT+ EP FUNCTION Power Supply. Connect together and bypass with a 0.1F in parallel with a 4.7F capacitor to GND. Video Input 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. Ground Negative Differential Output Positive Differential Output Exposed Paddle. Connect to GND.
Pin Description (MAX9547)
PIN 1 2 3 4 5 6 7 8 EP NAME IN+ ZT+ ZTINGND LOS IOUT VCC EP Positive Differential Input Positive Transconductance Terminal Negative Transconductance Terminal Negative Differential Input Ground 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. Current Output Power Supply. Bypass with a 0.1F capacitor in parallel with a 4.7F capacitor to GND. Exposed Paddle. Connect to GND. FUNCTION
Detailed Description
The MAX9546/MAX9547 differential interface chipset converts single-ended voltages to differential voltages for transport and then converts back to single-ended voltages. The chipset is optimized for transporting CVBS/FBAS analog video signals (PAL or NTSC) through hostile automotive environments. 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 shortcircuit conditions to an automotive battery (VBAT = 16V),
supply (VCC), or ground. These devices 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 maximum input resistance should not exceed 400 to ensure device stability.
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Differential Video Interface Chipset
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-bandwidth product at high frequencies and the output resistance 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.
MAX9546/MAX9547
IN+
1 + VIN
7
IOUT
IN-
4
VIN
K ZZT
Figure 1. Operational Mode
V VOUT = K IN RL Z ZT 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 transconductance ratio, K (RL / ZZT), where K = 1. The voltage gain (AV) is set by the impedance of the transconductance network (ZZT) and the output load impedance (RL) according to the following formula: R A V = K L Z ZT 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 Z ZT 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 transconductance element impedance (ZZT). Output current should not exceed 8.8mA except under fault conditions.
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MAX9547
Receiver The MAX9547 receiver is a differential-to-single-ended converter 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 element 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 userselected transconductance 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 transconductance 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:
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Differential Video Interface Chipset MAX9546/MAX9547
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 transmission line. For example, a Category 5 cable has a characteristic impedance of 110, so the sum of the two RS or RT resistors must be 110 to correctly drive the line. To balance the signals they must be equal, so RS and RT are 55 each. 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 requirements. 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.
Using Other Transmitters and Receivers
The MAX9546/MAX9547 are used with other transmitters and receivers; either other MAXIM devices or other
VDD
4.7F R1 3.92k
0.1F
+3.2 VDC OFFSET D1 1 VCC 3 FAULT 8 VCC OUT+ 7 R2 55 C3 470F TO A DEVICE OTHER THAN A MAX9547 USING CAT5, ETC.
U1 MAX9546
0V OFFSET 2 C4 0.33F IN GND 4 GND 5 OUT6 R3 55 C5 470F
R4 75
+3.2 VDC OFFSET
Figure 2. Suggested MAX9546 Configuration for Use with Other Devices
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Differential Video Interface Chipset MAX9546/MAX9547
+8V
0.1F OPTIONAL EQ NETWORK FOR LONG CABLE RUNS 75 Zt 2 3 0V OFFSET C3 22F 1 4 R3 10k ZTP ZTN IP IN
4.7F 3.92k D1 LED LOS IOUT 6 7
8 VCC
U1 MAX9547
GND 5
75
TO A DEVICE OTHER THAN A MAX9546 USING CAT5, ETC.
R4 110 R6 10k
0V OFFSET
C4 22F
+3.2 VDC OFFSET
3.2V LOW-NOISE REFERENCE 10F 0.1F
Figure 3. Suggested MAX9547 Configuration When Using Other Devices
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Differential Video Interface Chipset MAX9546/MAX9547
+8V
0.1F OPTIONAL EQ NETWORK FOR LONG CABLE RUNS 75 Zt 2 3 0V OFFSET C3 470F R3 51 R805 1 4 ZTP ZTN IP IN
4.7F 3.92k D1 LED LOS IOUT 6 7
8 VCC
U1 MAX9547
GND 5
75
TO A DEVICE OTHER THAN A MAX9546 USING CAT5, ETC. 0V OFFSET C4 470F
R5 51 R805
+3.2 VDC OFFSET
3.2V LOW-NOISE REFERENCE 100F 0.1F
Figure 4. Alternate MAX9547 Configuration for Use with Other Devices
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Differential Video Interface Chipset
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 assembly. 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 structures 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 discharged 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 1.5k resistor.
MAX9546/MAX9547
RC 1M CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 1.5k DISCHARGE RESISTANCE DEVICE UNDER TEST
IP 100% 90% AMPERES
Ir
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
Cs 100pF
STORAGE CAPACITOR
36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM
Figure 5. Human Body ESD Test Model
Figure 6. Human Body Current Waveform
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Differential Video Interface Chipset MAX9546/MAX9547
IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance 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 withstand 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.
RC 50 to 100 CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
I 100% 90%
Cs 150pF
STORAGE CAPACITOR
IPEAK 10% t 30ns 60ns tr = 0.7ns TO 1ns
Figure 7.IEC 1000-4-2 ESD Test Model
Figure 8. IEC 1000-4-2 ESD Generator Current Waveform
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Differential Video Interface Chipset
Typical Application Circuit
7.5V TO 10V 7.5V TO 10V
MAX9546/MAX9547
0.1F GND1
4.7F
0.1F GND2 VCC VCC 4.7k ZZT 75 ZTZT+
4.7F
VCC 4.7k
FAULT
LOS
MAX9546
75 CIN 0.33F OUT+ IN OUTAC 75
RS 55 IN+ RS 55 IN-
MAX9547
VOUT IOUT RL 75
GND1
GND
GND
RT1 55
RT2 55
GND
GND2
GND1 GND1
CT 1F TO 47F GND2 GND2
NOTE: TYPICAL APPLICATION CIRCUIT FOR 110 UNSHIELDED (UTP) CABLE WITH AN OVERALL UNITY GAIN IN A 75 VIDEO APPLICATION.
Pin Configurations
TOP VIEW MAX9546
VCC IN FAULT 1 2 3 + 8 7 6 5 VCC OUT+ OUTGND IN+ 1 ZT+ 2 ZT3 +
MAX9547
8 7 6 5 VCC IOUT LOS GND
GND 4
IN- 4
SO-EP
SO-EP
Chip Information
PROCESS: BICMOS
______________________________________________________________________________________ 15
Differential Video Interface Chipset MAX9546/MAX9547
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
8L, SOIC EXP. PAD.EPS
PACKAGE OUTLINE 8L SOIC, .150" EXPOSED PAD
21-0111
C
1 1
Revision History
Pages changed at Rev 2: 1, 4, 11, 12 Pages changed at Rev 3: 1, 2, 3, 4, 9-16
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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