19-3873; Rev 0; 10/05 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 (V BAT = +16V) or ground. The MAX9546 specifies the common-mode balance (CMB) of the differential outputs. The MAX9547 receiver converts the differential signal from the MAX9546 into a single-ended signal. Like the MAX9546 output, the MAX9547 input survives a short to a high battery condition or ground. The MAX9547 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 temperature range. Features ♦ Fault Detection (MAX9546) ♦ Loss-of-Signal Detection (MAX9547) ♦ Tolerate ±2V Ground-Level Shift between Source and Load ♦ Specifies Common-Mode Balance (MAX9546) ♦ ±15kV ESD Protection (Human Body Model) ♦ ±8kV—IEC 1000-4-2 Contact Discharge ♦ ±15kV—IEC 1000-4-2 Air-Gap Discharge ♦ Preset 6dB Gain (MAX9546) ♦ Variable Receiver Gain (MAX9547) ♦ 7.5V to 10V Single-Supply Operation Ordering Information 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 -40°C to +85°C temperature range. +Denotes lead-free package. *EP = Exposed paddle. Pin Configuration appears at end of data sheet. Typical Operating Circuit Applications VCC VCC Automotive Video ZT+ MAX9547 MAX9546 Car Navigation ZT- In-Car Entertainment OUT+ IN+ OUT- IN- IN Collision Avoidance/Rearview Cameras Security/CCTV Video Avionics/In-Flight Entertainment IOUT VOUT CLAMP FAULT LOS ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 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 = +70°C) 8-Pin SO (derate 19.2mW/°C above +70°C)...............1538mW 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 (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. 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 = 220Ω between OUT+ and OUT-, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 7.5 8.5 10.0 V 64 112 mA 2 2.2 V/V 1.2 VP-P 13 µA Supply Voltage Range VCC Guaranteed by PSRR Quiescent Supply Current ICC No load Voltage Gain AV VIN = 1.2VP-P (Note 3) Input-Voltage Swing VIN Guaranteed by AV Input Clamp Voltage VCLMP (Note 4) 3.46 Input Clamp Current ICLMP (Note 4) 7 Input Resistance RIN Output Common-Mode Voltage VCOM Output Impedance ROUT Output Fault Current Power-Supply Rejection Ratio FAULT Output Logic Level FAULT Output Leakage Current 2 IF(OUT) PSRR 1.8 (Notes 4, 5) V 500 3.0 3.25 kΩ 3.4 OUT+ and/or OUT- to +16V 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 OUT+ or OUT- to -2V, VCC unconnected 24 VCC from 7.5V to 10V (Note 6) Differential mode 45 62 Common mode 46 52 VOL, ISINK = 1.6mA (Note 7) mA dB 0.4 0.01 _______________________________________________________________________________________ V Ω 0.1 V µA Differential Video Interface Chipset (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 2) PARAMETER SYMBOL Large-Signal Bandwidth Large-Signal Flatness Slew Rate SR Settling Time (0.1%) CONDITIONS MIN PSRR Common-Mode Balance (Note 8) CMB Droop MAX UNITS 18 MHz VIN = 1VP-P, ±0.5dB 15 MHz OUT+ - OUT- 70 V/µs tSETTLING VIN = 1VP-P Power-Supply Rejection Ratio TYP VIN = 1VP-P, -3dB 400 ns f = 100kHz, 100mVP-P ripple 63 dB f = 100kHz 50 f = 3.58MHz 30 Guaranteed by input current 1 dB % DC ELECTRICAL CHARACTERISTICS—MAX9547 (VCC = +8.5V, GND = 0V, RL = 75Ω, ZZT = 75Ω, TA = -40°C to +85°C. Typical values are at TA = +25°C.) (Note 2) 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 9) VCOM Guaranteed by CMRR (Note 9) MIN TYP MAX 7.5 8.5 10.0 V 70 110 mA 1.2 VP-P 5.4 V 1.0 UNITS IIN 6 30 µA Input Offset Current ∆IIN 1 4.2 µA Input Resistance RIN Differential Voltage Gain AV VIN(P-P) = 1.2V, defined as IOUT x (RL / VIN) 1.15 V/V Output Voltage VOB Output Voltage Swing VOUT Maximum Output Current 80 0.90 1 kΩ IN+ = IN- = 3.2V 1 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 2V ≤ VCOM ≤ 4.4V 46 70 LOS Logic Level 1.2 VOL, ISINK = 1.6mA (Note 10) LOS Leakage Current Input Fault Current IN+ and/or IN- to +16V, RT1 + RT2 = 110Ω 50 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 VP-P dB 0.4 0.01 IF V V µA mA _______________________________________________________________________________________ 3 MAX9546/MAX9547 AC ELECTRICAL CHARACTERISTICS—MAX9546 MAX9546/MAX9547 Differential Video Interface Chipset AC ELECTRICAL CHARACTERISTICS—MAX9547 (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 2) PARAMETER SYMBOL Large-Signal Bandwidth Large-Signal Flatness Slew Rate CONDITIONS MIN MAX UNITS 20 MHz VIN = 1VP-P, ±0.5dB 15 MHz 50 V/µs SR Settling Time (0.1%) TYP VIN = 1VP-P, -3dB 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 760 µs LOS Timeout Period tSETTLING tLOS AC ELECTRICAL CHARACTERISTICS—MAX9546 Driving 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 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Differential Gain DG 3.8 % Differential Phase DP 0.6 degrees 5MHz lowpass, 100kHz highpass, VIN = 1VP-P 80 dB 2T = 250ns, bar time is 18µs, 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 Signal-to-Noise Ratio SNR 2T Pulse-to-Bar Rating 2T Pulse Response Group Delay D/dt All devices are 100% production tested at TA = +25°C. 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 400Ω max. The clamp should remain stable in this condition. Note 6: Differential mode is defined as (OUT+ - OUT-). Common mode is defined as OUT+ + OUT2 Note 7: A fault is when the outputs both sink and source current and the amount of extra current sink or source is greater than 3mA. Note 8: Common-mode balance is defined as 20log((OUT+ - OUT-) / (OUT+ + OUT-)). Note 9: Ground between MAX9546 and MAX9547 can be a ±2V difference. Note 10: A loss-of-signal is when the input video signal of the MAX9547 does not change (cross 100mV level from sync tip) for 10 video lines. Note 2: Note 3: Note 4: Note 5: 4 _______________________________________________________________________________________ Differential Video Interface Chipset 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 0.01 0.1 10 1 -15 -10 35 -40 85 60 -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 -50 VCOM = 2V -40 -50 -60 -60 -70 -70 0.001 0.01 0.1 MAX9546 toc06 8 7 6 -80 10 1 -40 -15 FREQUENCY (MHz) 10 35 5 -40 85 60 -15 TEMPERATURE (°C) 60 85 MAX9546 DIFFERENTIAL OUTPUT RESISTANCE vs. TEMPERATURE 200 180 DIFFERENTIAL ROUT (mΩ) 160 35 140 120 100 80 60 160 140 120 100 80 60 40 40 20 20 0 MAX9546 toc08 180 10 TEMPERATURE (°C) MAX9547 DIFFERENTIAL INPUT RESISTANCE vs. TEMPERATURE 200 85 VCOM = 5.4V MAX9546 toc07 -80 0.0001 9 ICLMP (µA) -20 CMRR (dB) -20 -40 VRIPPLE = 100mVP-P fRIPPLE = 10kHz -10 10 MAX9546 toc05 0 MAX9546 toc04 VRIPPLE = 100mVP-P DIFFERENTIAL RIN (kΩ) CMRR (dB) -40 FREQUENCY (MHz) 0 -10 15 -2 0 -40 -15 10 35 TEMPERATURE (°C) 60 85 -40 -15 10 35 60 85 TEMPERATURE (°C) _______________________________________________________________________________________ 5 MAX9546/MAX9547 Typical Operating Characteristics (VCC = +8.5V, RL = 220Ω between OUT+ and OUT-, RL = 75Ω (MAX9547), ZZT = 75Ω, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (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. TEMPERATURE -10 -20 -20 MAX9547 PSRR (dB) -30 -40 MAX9547 -30 -40 -50 -50 -60 VRIPPLE = 100mVP-P fRIPPLE = 100kHz -10 -80 0.001 0.01 0.1 1 -40 10 -15 10 35 85 60 -40 -60 0.001 0.01 0.1 MAX9546 toc13 50 1 2 3 4 5 6 1.0 GROUP DELAY (ns) 40 DIFFERENTIAL PHASE (MAX9546 DRIVING MAX9547) 1 GROUP DELAY vs. FREQUENCY (MAX9546 DRIVING MAX9547) MAX9546 toc12 30 20 10 0.6 0 0.2 -0.2 -10 -0.6 -1.0 0.1 1 2 3 4 5 1 10 FREQUENCY (MHz) 6 SIGNAL-TO-NOISE RATIO vs. FREQUENCY (MAX9546 DRIVING MAX9547) OUTPUT RESPONSE TO NTC-7 VIDEO TEST SIGNAL (MAX9546 DRIVING MAX9547) MAX9546 toc14 0 -10 -20 -30 SNR (dB) MAX9546 INPUT 500mV/div MAX9547 OUTPUT 500mV/div MAX9546 toc15 DIFFERENTIAL GAIN (%) -30 FREQUENCY (MHz) DIFFERENTIAL GAIN (MAX9546 DRIVING MAX9547) DIFFERENTIAL PHASE (deg) -20 TEMPERATURE (°C) FREQUENCY (MHz) 5 4 3 2 1 0 -1 -2 -3 -10 -50 -70 -70 -80 0.0001 MAX9546 -60 MAX9546 0 MAX9546 toc11 VRIPPLE = 100mVP-P MAX9546 toc10 0 MAX9546 toc09 0 MAX9546 COMMON-MODE BALANCE vs. FREQUENCY COMMON-MODE BALANCE (dB) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY PSRR (dB) MAX9546/MAX9547 Differential Video Interface Chipset -40 -50 -60 -70 -80 -90 -100 110 -120 10µs/div 0.1 1 FREQUENCY (MHz) 6 _______________________________________________________________________________________ 10 10 100 Differential Video Interface Chipset PIN NAME 1, 8 VCC 2 IN 3 FAULT FUNCTION Power Supply. Connect together and bypass with a 0.1µF in parallel with a 4.7µF 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+ Positive Differential Output EP EP 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 0.1µF capacitor in parallel with a 4.7µF 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), 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 400Ω to ensure device stability. _______________________________________________________________________________________ 7 MAX9546/MAX9547 Pin Description (MAX9546) MAX9546/MAX9547 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. IN+ 1 + IOUT 7 VIN IN- 4 VIN K ZZT ⎛ ( OUT + ) − ( OUT − ) ⎞ CMB = 20Log⎜ ⎟ ⎝ ( OUT + ) + ( OUT − ) ⎠ 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: 8 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. _______________________________________________________________________________________ Differential Video Interface Chipset 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 R T 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 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. ±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 RD 1.5kΩ RC 1MΩ CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF 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 2 shows the Human Body Model, and Figure 3 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 1.5kΩ resistor. IP 100% 90% DISCHARGE RESISTANCE STORAGE CAPACITOR 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). Ir AMPERES DEVICE UNDER TEST 36.8% 10% 0 0 Figure 2. Human Body ESD Test Model PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) tRL TIME tDL CURRENT WAVEFORM Figure 3. Human Body Current Waveform _______________________________________________________________________________________ 9 MAX9546/MAX9547 Applications Information 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 4). 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 50Ω to 100Ω CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 150pF stand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 5 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 330Ω 100% 90% DISCHARGE RESISTANCE STORAGE CAPACITOR Figure 4.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 5. IEC 1000-4-2 ESD Generator Current Waveform 10 ______________________________________________________________________________________ Differential Video Interface Chipset 7.5V TO 10V 7.5V TO 10V 4.7µF 0.1µF 4.7µF 0.1µF GND1 GND2 VCC VCC VCC 4.7kΩ 4.7kΩ ZT+ ZZT 75Ω FAULT LOS ZT- MAX9546 CIN 0.1µF 75Ω MAX9547 RS 55Ω OUT+ IN IN+ VOUT RS 55Ω IOUT OUT- IN- 75Ω AC GND GND1 GND RT2 55Ω RT1 55Ω RL 75kΩ GND GND2 CT 1µF TO 47µF GND1 GND2 GND1 GND2 NOTE: TYPICAL APPLICATION CIRCUIT FOR 110Ω UNSHIELDED (UTP) CABLE WITH AN OVERALL UNITY GAIN IN A 75Ω 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 ______________________________________________________________________________________ 11 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 B 1 1 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. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.