19-3873; Rev 3; 10/07 Differential Video Interface Chipset 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. 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 Ordering Information PINPACKAGE PART 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 temperature range. +Denotes a lead-free package. *EP = Exposed paddle. Pin Configuration appears at end of data sheet. Typical Operating Circuit Applications VCC VCC Automotive Video Car Navigation ZT+ In-Car Entertainment Collision Avoidance/Rearview Cameras ZTOUT+ IN+ OUT- IN- IN Security/CCTV Video Avionics/In-Flight Entertainment MAX9547 MAX9546 IOUT VOUT CLAMP FAULT LOS ________________________________________________________________ Maxim Integrated Products 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. 1 MAX9546/MAX9547 General Description MAX9546/MAX9547 Differential Video Interface Chipset ABSOLUTE MAXIMUM RATINGS 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 (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 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 SYMBOL CONDITIONS Supply Voltage Range VCC Guaranteed by PSRR Quiescent Supply Current ICC No load Voltage Gain AV VIN = 1.2VP-P (Note 4) Input-Voltage Swing VIN Guaranteed by AV Input Clamp Voltage VCLMP (Note 5) Input Clamp Current ICLMP (Note 5) Input Resistance RIN Output Common-Mode Voltage VCOM Output Impedance ROUT Output Fault Current IF(OUT) MIN TYP MAX 7.5 8.5 10.0 V 64 112 mA 2 2.2 V/V 1.2 VP-P 1.8 3.46 7 (Notes 5, 6) FAULT Output Logic Level FAULT Output Leakage Current 2 PSRR 3.25 13 9 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 VCC from 7.5V to 10V (Note 7) A k 3.4 0.1 OUT+ and/or OUT- to +16V OUT+ or OUT- to -2V, VCC unconnected Power-Supply Rejection Ratio V 500 3.0 UNITS V mA 24 Differential mode 45 62 Common mode 46 52 VOL, ISINK = 1.6mA (Note 8) dB 0.4 0.01 _______________________________________________________________________________________ V A Differential Video Interface Chipset (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 SYMBOL Large-Signal Bandwidth Large-Signal Flatness Slew Rate SR Settling Time (0.1%) CONDITIONS MIN PSRR Common-Mode Balance (Note 9) CMB Droop MAX UNITS 18 MHz VIN = 1VP-P, 0.5dB 15 MHz OUT+ - OUT- 70 V/s tSETTLING VIN = 1VP-P Power-Supply Rejection Ratio TYP VIN = 1VP-P, -3dB 400 ns f = 100kHz, 100mVP-P ripple 63 dB f = 100kHz 55 f = 3.58MHz 39 Guaranteed by input current 1 dB % Differential Gain DG (Note 10) 1.37 % Differential Phase DP (Note 10) 0.14 degrees SNR (Note 10) -62 dB 2T Pulse to Bar Rating (Note 10) -0.22 %KF 2T Pulse Response (Note 10) 0.30 %KF At 3.58MHz (Note 10) 2.20 ns SNR (dBRMS) Group Delay D/dt Horizontal Tilt (Notes 10, 15) 0 % Vertical Tilt (Notes 10, 15) 6.62 % 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 SYMBOL Supply Voltage Range VCC Supply Current ICC Differential Input Voltage Range |IN+ - IN-| Common-Mode Input Voltage Range Input Current CONDITIONS Guaranteed by PSRR VIN(P-P) Guaranteed by CMRR (Note 11) VCOM Guaranteed by CMRR (Note 11) MIN TYP MAX UNITS 7.5 8.5 10.0 V 70 110 mA 1.2 VP-P 5.4 V 6 30 A 1 4.2 1.0 IIN Input Offset Current IIN Input Resistance RIN Differential Voltage Gain AV VIN(P-P) = 1.2V, defined as IOUT x (RL / VIN) 80 0.90 Output Voltage VOB Output Voltage Swing VOUT Maximum Output Current IOUT VIN = 1V, ZZT = 0 Power-Supply Rejection Ratio PSRR VCC from 7.5V to 10V 1V VCOM 5.4V 2V VCOM 4.4V 46 70 Common-Mode Rejection Ratio CMRR IN+ = IN- = 3.2V 1 A k 1.15 V/V 1.2 VP-P 1 V 21 mA 26 34 dB 42 54 dB _______________________________________________________________________________________ 3 MAX9546/MAX9547 AC ELECTRICAL CHARACTERISTICS--MAX9546 MAX9546/MAX9547 Differential Video Interface Chipset 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 SYMBOL LOS Logic Level CONDITIONS MIN LOS Leakage Current Input Fault Current TYP VOL, ISINK = 1.6mA (Note 12) MAX UNITS 0.4 V 0.01 IF IN+ and/or IN- to +16V, RT1 + RT2 = 110 50 IN+ and/or IN- to -2V, RT1 + RT2 = 110 10 IN+ and/or IN- to +16V, VCC unconnected, RT1 + RT2 = 110 72 IN+ and/or IN- to -2V, VCC unconnected, RT1 + RT2 = 110 10 A mA 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 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 SR 50 V/s tSETTLING 400 ns 30 dB Slew Rate Settling Time (0.1%) Power-Supply Rejection Ratio PSRR f = 100kHz, 100mVP-P ripple Common-Mode Rejection Ratio CMRR f = 100kHz, 100mVP-P ripple 53 dB 760 s (Notes 13, 14) 2.65 % DP (Notes 13, 14) 0.57 degrees SNR (Notes 13, 14) -72 dB (Notes 13, 14) -0.06 %KF (Notes 13, 14) 0.40 %KF 0 ns LOS Timeout Period tLOS Differential Gain DG Differential Phase SNR (dBRMS) 2T Pulse to Bar Rating 2T Pulse Response Group Delay D/dt At 3.58MHz (Notes 13, 14) Horizontal Tilt (Notes 13, 14, 15) 0.10 % Vertical Tilt (Notes 13, 14, 15) 1.16 % 4 _______________________________________________________________________________________ Differential Video Interface Chipset (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 SYMBOL Differential Gain DG Differential Phase DP Signal-to-Noise Ratio SNR 2T Pulse-to-Bar Rating 2T Pulse Response Group Delay D/dt CONDITIONS MIN TYP MAX UNITS 3.8 % 0.6 degrees 5MHz lowpass, 100kHz highpass, VIN = 1VP-P 80 dB 2T = 250ns, bar time is 18s, the beginning 3.5% and the ending 3.5% of the bar time is ignored 0.2 % 2T = 250ns 0.25 % At 3.58MHz 10 ns Horizontal Tilt (Note 15) 0.12 % Vertical Tilt (Note 15) 0.26 % 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. _______________________________________________________________________________________ 5 MAX9546/MAX9547 AC ELECTRICAL CHARACTERISTICS--MAX9546 Driving MAX9547 Typical Operating Characteristics (VCC = +8.5V, RL = 220 between OUT+ and OUT-, RL = 75 (MAX9547), ZZT = 75, TA = +25C, unless otherwise noted.) MAX9547 IOUT CURRENT vs. TEMPERATURE GAIN vs. TEMPERATURE MAX9546 10 VIN = 1VP-P 7 25 MAX9546 toc02 MAX9546 toc01 8 6 MAX9546 toc03 GAIN vs. FREQUENCY 20 23 MAX9547 -10 MAX9546 4 IIOUT (mA) 0 GAIN (dB) GAIN (dB) 5 3 MAX9547 2 21 19 1 -20 17 0 -1 -30 0.001 0.1 10 1 -40 -15 -10 35 -15 10 35 60 TEMPERATURE (C) TEMPERATURE (C) MAX9547 COMMON-MODE REJECTION RATIO vs. FREQUENCY MAX9547 COMMON-MODE REJECTION RATIO vs. TEMPERATURE MAX9546 INPUT CLAMP CURRENT vs. TEMPERATURE -30 -30 CMRR (dB) -20 10 9 ICLMP (A) -10 -20 -40 VRIPPLE = 100mVP-P fRIPPLE = 10kHz VCOM = 2V -40 -50 -60 -60 -70 -70 -80 0.0001 -80 0.001 0.01 0.1 10 1 7 VCOM = 5.4V -15 FREQUENCY (MHz) 10 35 5 -40 85 60 -15 TEMPERATURE (C) 140 120 100 80 60 180 160 140 120 100 80 60 40 40 20 20 0 MAX9546 toc08 200 DIFFERENTIAL ROUT (m) 160 35 MAX9546 DIFFERENTIAL OUTPUT RESISTANCE vs. TEMPERATURE MAX9546 toc07 180 10 TEMPERATURE (C) MAX9547 DIFFERENTIAL INPUT RESISTANCE vs. TEMPERATURE DIFFERENTIAL RIN (k) 8 6 -40 200 0 -40 -15 10 35 TEMPERATURE (C) 60 85 MAX9546 toc06 0 MAX9546 toc05 VRIPPLE = 100mVP-P -50 6 -40 85 60 FREQUENCY (MHz) MAX9546 toc04 -10 15 -2 0.01 0 CMRR (dB) MAX9546/MAX9547 Differential Video Interface Chipset 85 -40 -15 10 35 60 TEMPERATURE (C) _______________________________________________________________________________________ 85 60 85 Differential Video Interface Chipset POWER-SUPPLY REJECTION RATIO vs. TEMPERATURE POWER-SUPPLY REJECTION RATIO vs. FREQUENCY VRIPPLE = 100mVP-P -10 -20 PSRR (dB) MAX9547 -30 -40 -50 -50 -70 -70 -80 0.001 0.01 0.1 1 -40 10 -15 10 35 85 60 TEMPERATURE (C) FREQUENCY (MHz) GROUP DELAY vs. FREQUENCY (MAX9546 DRIVING MAX9547) DIFFERENTIAL GAIN (MAX9546 DRIVING MAX9547) MAX9546 toc12 50 MAX9546 toc13 5 4 3 2 1 0 -1 -2 -3 40 1 2 3 4 5 6 DIFFERENTIAL PHASE (MAX9546 DRIVING MAX9547) 1.0 GROUP DELAY (ns) 30 20 10 0.6 0 0.2 -0.2 -10 0.1 -0.6 -1.0 1 10 FREQUENCY (MHz) 1 2 3 4 5 6 OUTPUT RESPONSE TO NTC-7 VIDEO TEST SIGNAL (MAX9546 DRIVING MAX9547) SIGNAL-TO-NOISE RATIO vs. FREQUENCY (MAX9546 DRIVING MAX9547) MAX9546 toc14 0 -10 -20 -30 MAX9546 INPUT 500mV/div MAX9546 toc15 DIFFERENTIAL GAIN (%) -40 SNR (dB) -80 0.0001 MAX9546 -60 MAX9546 DIFFERENTIAL PHASE (deg) PSRR (dB) MAX9547 -40 -60 VRIPPLE = 100mVP-P fRIPPLE = 100kHz -10 -20 -30 MAX9546 toc10 0 MAX9546 toc09 0 MAX9547 OUTPUT 500mV/div 10s/div -50 -60 -70 -80 -90 -100 110 -120 0.1 1 10 FREQUENCY (MHz) _______________________________________________________________________________________ 7 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.) Differential Video Interface Chipset MAX9546/MAX9547 Pin Description (MAX9546) PIN NAME 1, 8 VCC 2 IN 3 FAULT 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. 4, 5 GND Ground 6 OUT- Negative Differential Output 7 OUT+ EP EP Positive Differential Output Exposed Paddle. Connect to GND. Pin Description (MAX9547) PIN NAME 1 IN+ FUNCTION 2 ZT+ Positive Transconductance Terminal 3 ZT- Negative Transconductance Terminal 4 IN- Negative Differential Input 5 GND Ground 6 LOS 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 0.1F capacitor in parallel with a 4.7F capacitor to GND. EP EP Positive Differential Input Exposed Paddle. Connect to GND. 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), 8 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. _______________________________________________________________________________________ Differential Video Interface Chipset 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. 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: IN+ 1 + IOUT 7 VIN 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. _______________________________________________________________________________________ 9 MAX9546/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 MAX9546/MAX9547 Differential Video Interface Chipset 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. 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. 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 0.1F 4.7F R1 3.92k +3.2 VDC OFFSET D1 3 FAULT 1 8 VCC VCC OUT+ U1 7 R2 55 C3 470F 0V OFFSET 2 R4 75 C4 0.33F MAX9546 IN OUTGND 4 6 GND 5 R3 55 C5 470F +3.2 VDC OFFSET Figure 2. Suggested MAX9546 Configuration for Use with Other Devices 10 ______________________________________________________________________________________ TO A DEVICE OTHER THAN A MAX9547 USING CAT5, ETC. Differential Video Interface Chipset 4.7F 0.1F 75 Zt OPTIONAL EQ NETWORK FOR LONG CABLE RUNS 2 3 1 0V OFFSET C3 22F 4 R3 10k 3.92k 8 ZTP ZTN IP IN VCC D1 LED U1 LOS MAX9547 IOUT GND 6 7 75 5 R4 110 TO A DEVICE OTHER THAN A MAX9546 USING CAT5, ETC. 0V OFFSET R6 10k C4 22F +3.2 VDC OFFSET 3.2V LOW-NOISE REFERENCE 10F 0.1F Figure 3. Suggested MAX9547 Configuration When Using Other Devices ______________________________________________________________________________________ 11 MAX9546/MAX9547 +8V MAX9546/MAX9547 Differential Video Interface Chipset +8V 0.1F 75 Zt OPTIONAL EQ NETWORK FOR LONG CABLE RUNS 3 1 C3 470F R3 51 R805 TO A DEVICE OTHER THAN A MAX9546 USING CAT5, ETC. 0V OFFSET C4 470F 3.92k 8 2 0V OFFSET 4.7F 4 ZTP ZTN IP IN VCC D1 LED U1 LOS MAX9547 IOUT 6 7 GND 5 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 12 ______________________________________________________________________________________ 75 Differential Video Interface Chipset 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. RD 1.5k RC 1M CHARGE-CURRENTLIMIT RESISTOR IP 100% 90% DISCHARGE RESISTANCE Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES HIGHVOLTAGE DC SOURCE Cs 100pF STORAGE CAPACITOR DEVICE UNDER TEST 36.8% 10% 0 0 Figure 5. Human Body ESD Test Model tRL TIME tDL CURRENT WAVEFORM Figure 6. Human Body Current Waveform ______________________________________________________________________________________ 13 MAX9546/MAX9547 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 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 with- RC 50 to 100 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. I RD 330 100% 90% CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 150pF DISCHARGE RESISTANCE STORAGE CAPACITOR Figure 7.IEC 1000-4-2 ESD Test Model DEVICE UNDER TEST IPEAK MAX9546/MAX9547 Differential Video Interface Chipset 10% t tr = 0.7ns TO 1ns 30ns 60ns Figure 8. IEC 1000-4-2 ESD Generator Current Waveform 14 ______________________________________________________________________________________ Differential Video Interface Chipset 7.5V TO 10V 7.5V TO 10V 4.7F 0.1F 4.7F 0.1F GND1 GND2 VCC VCC VCC 4.7k 4.7k ZT+ ZZT 75 FAULT LOS ZT- MAX9546 75 CIN 0.33F MAX9547 RS 55 OUT+ IN IN+ VOUT RS 55 IOUT OUT- IN- 75 AC GND GND1 GND RT2 55 RT1 55 RL 75 GND GND2 CT 1F TO 47F GND1 GND2 GND1 GND2 NOTE: TYPICAL APPLICATION CIRCUIT FOR 110 UNSHIELDED (UTP) CABLE WITH AN OVERALL UNITY GAIN IN A 75 VIDEO APPLICATION. Pin Configurations TOP VIEW MAX9547 MAX9546 + 8 VCC IN+ 1 2 7 OUT+ 3 6 OUT- ZT- GND 4 5 GND VCC 1 IN FAULT + 8 VCC ZT+ 2 7 IOUT 3 6 LOS IN- 4 5 GND SO-EP SO-EP Chip Information PROCESS: BICMOS ______________________________________________________________________________________ 15 MAX9546/MAX9547 Typical Application Circuit 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 MAX9546/MAX9547 Differential Video Interface Chipset 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.