19-2422; Rev 0; 4/02 Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection The MAX4385E/MAX4386E op amps are unity-gain stable devices that combine high-speed performance, Rail-to-Rail ® outputs, and ±15kV ESD protection. Targeted for applications where an input or an output is exposed to the outside world, such as video and communications, these devices are compliant with International ESD Standards: ±15kV IEC 1000-4-2 AirGap Discharge, ±8kV IEC 1000-4-2 Contact Discharge, and the ±15kV Human Body Model. The MAX4385E/MAX4386E operate from a single 5V supply with a common-mode input voltage range that extends beyond VEE. The MAX4385E/MAX4386E consume only 5.5mA of quiescent supply current per amplifier while achieving a 230MHz -3dB bandwidth, 30MHz 0.1dB gain flatness and a 450V/µs slew rate. Applications Set-Top Boxes Surveillance Video Systems Battery-Powered Instruments Analog-to-Digital Converter Interface CCD Imaging Systems Video Routing and Switching Systems Digital Cameras Video-on-Demand Video Line Driver Features ♦ ESD-Protected Inputs and Outputs ±15kV—Human Body Model ±8kV—IEC 1000-4-2 Contact Discharge ±15kV—IEC 1000-4-2 Air-Gap Discharge ♦ Low Cost and High Speed 230MHz -3dB Bandwidth 30MHz 0.1dB Gain Flatness 450V/µs Slew Rate ♦ Rail-to-Rail Outputs ♦ Input Common-Mode Range Extends Beyond VEE ♦ Low Differential Gain/Phase: 0.02%/0.01° ♦ Low Distortion at 5MHz -60dBc SFDR -58dB Total Harmonic Distortion ♦ Ultra-Small 5-Pin SOT23 and 14-Pin TSSOP Packages Ordering Information PART TEMP RANGE PINPACKAGE TOP MARK MAX4385EEUK-T -40°C to +85°C 5 SOT23-5 ADZL MAX4386EESD -40°C to +85°C 14 SO — MAX4386EEUD -40°C to +85°C 14 TSSOP — Pin Configurations Typical Operating Circuit 5V TOP VIEW 2.2µF IN OUT 1 75Ω 75Ω 5 VCC 4 IN- OUT Zo = 75Ω MAX4385E VEE 2 MAX4385E 75Ω IN+ 3 220Ω 220Ω SOT23 VIDEO LINE DRIVER Pin Configurations continued at end of data sheet. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. ________________________________________________________________ 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 MAX4385E/MAX4386E General Description MAX4385E/MAX4386E Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection ABSOLUTE MAXIMUM RATINGS Power-Supply Voltage (VCC to VEE) .........................-0.3V to +6V IN_+, IN_-, OUT_,.............................(VEE - 0.3V) to (VCC + 0.3V) Output Short-Circuit Duration to VCC or VEE.............................................................Continuous Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23 (derate 8.7mW/°C above +70°C)...........696mW 14-Pin SO (derate 8.33mW/°C above +70°C).............667mW 14-Pin TSSOP (derate 10mW/°C above +70°C) .........727mW 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 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 at 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 (VCC = 5V, VEE = 0, VCM = VCC/2, VOUT = VCC/2, RL = ∞ to VCC/2, CBYPASS = 2.2µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Input Common-Mode Voltage Range VCM Input Offset Voltage VOS Input Offset Voltage Matching Input Offset Voltage Tempco Input Bias Current Input Offset Current Input Resistance CONDITIONS MIN VEE 0.2 Guaranteed by CMRR TA = +25°C 0.2 TA = -40°C to +85°C V 20 mV 1 mV µV/°C IB 6.5 20 0.5 7 IOS RIN Open-Loop Gain kΩ Common mode (-0.2V ≤ VCM ≤ +2.75V) 3 MΩ 95 dB VEE - 0.2V ≤ VCM ≤ VCC - 2.25V 70 0.25V ≤ VOUT ≤ 4.75V, RL = 2kΩ 50 61 0.8V ≤ VOUT ≤ 4.5V, RL = 150Ω 48 63 RL = 150Ω VOUT RL = 75Ω RL = 75Ω to ground ISC Open-Loop Output Resistance ROUT Power-Supply Rejection Ratio PSRR µA 70 RL = 2kΩ IOUT µA Differential mode (-1V ≤ VIN ≤ +1V) 1V ≤ VOUT ≤ 4V, RL = 50Ω 2 VCC 2.25 8 AVOL Output Short-Circuit Current UNITS 28 MAX4386E CMRR Output Current MAX TCVOS Common-Mode Rejection Ratio Output Voltage Swing TYP VCC - VOH 0.05 0.270 VOL - VEE 0.05 0.150 0.5 VCC - VOH 0.3 VOL - VEE 0.25 0.8 VCC - VOH 0.5 0.8 VOL - VEE 0.5 1.75 VCC - VOH 1 1.7 VOL - VEE 0.025 0.125 Sinking from RL = 50Ω to VCC 40 55 Sourcing into RL = 50Ω to VEE 25 50 ±100 Sinking or sourcing VS = 4.5V to 5.5V dB 58 50 V mA 8 mA Ω 62 dB _______________________________________________________________________________________ Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection (VCC = 5V, VEE = 0, VCM = VCC/2, VOUT = VCC/2, RL = ∞ to VCC/2, CBYPASS = 2.2µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Operating Supply Voltage Range VS Quiescent Supply Current (per Amplifier) IS CONDITIONS Guaranteed by PSRR MIN 4.5 5.5 MAX UNITS 5.5 V 9 mA ±15 Human Body Model ESD Protection Voltage (Note 2) TYP IEC 1000-4-2 Contact Discharge ±8 IEC 1000-4-2 Air-Gap Discharge ±15 kV AC ELECTRICAL CHARACTERISTICS (VCC = 5V, VEE = 0, VCM = 1.5V, RL = 100Ω to VCC/2, VOUT = VCC/2, AVCL = 1V/V, TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Small-Signal -3dB Bandwidth BWSS VOUT = 100mVP-P 230 MHz Large-Signal -3dB Bandwidth BWLS VOUT = 2VP-P 180 MHz Small-Signal 0.1dB Gain Flatness BW0.1dBSS VOUT = 100mVP-P 33 MHz Large-Signal 0.1dB Gain Flatness BW0.1dBLS VOUT = 2VP-P 30 MHz V/µs Slew Rate SR VOUT = 2V step 450 Settling Time to 0.1% tS VOUT = 2V step 14 ns 4 ns -60 dBc Rise/Fall Time tR , tF VOUT = 100mVP-P Spurious-Free Dynamic Range SFDR fC = 5MHz, VOUT = 2VP-P 2nd harmonic Harmonic Distortion Two-Tone, Third-Order Intermodulation Distortion Channel-to-Channel Isolation HD IP3 CHISO Input 1dB Compression Point fC = 5MHz, VOUT = 2VP-P -70 3rd harmonic -60 total harmonic -58 dBc f1 = 4.7MHz, f2 = 4.8MHz, VOUT = 1VP-P -60 Specified at DC -95 dB fC = 10MHz, AVCL = 2V/V 13 dBm Degrees dBc Differential Phase Error DP NTSC, RL = 150Ω 0.01 Differential Gain Error DG NTSC, RL = 150Ω 0.02 % Input Noise-Voltage Density en f = 10kHz 11.5 nV/√Hz Input Noise-Current Density in f = 10kHz 2 pA/√Hz 8 pF f = 10MHz 2.2 Ω Input Capacitance CIN Output Impedance ZOUT Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design. Note 2: ESD protection is specified for test point A and test point B only (Figure 6). _______________________________________________________________________________________ 3 MAX4385E/MAX4386E DC ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (VCC = 5V, VEE = 0, VCM = 1.5V, AVCL = 1V/V, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.) 0 0 GAIN (dB) 1 -1 0.2 0.1 -0.2 -3 -3 -0.3 -4 -4 -0.4 -5 -5 -0.5 -0.6 -6 1M 10M 100M 100k 1G 1M LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY 100M 100k 1G 10M 0 -0.1 -0.2 -0.3 MAX4385E/86E toc05 0 100 10 1 -20 1G -30 -40 -50 -60 3RD HARMONIC -70 0.1 -0.4 VOUT = 2VP-P AVCL = 1V/V -10 DISTORTION (dBc) 0.1 100M DISTORTION vs. FREQUENCY OUTPUT IMPEDANCE vs. FREQUENCY MAX4385E/86E toc04 VOUT = 2VP-P 0.2 -80 2ND HARMONIC -90 -0.5 0.01 10M 100M -100 100k 1G 1M MAX4385E/86E toc07 -30 -40 -50 0 -10 3RD HARMONIC -60 VOUT = 2VP-P AVCL = 5V/V -20 DISTORTION (dBc) -20 3RD HARMONIC -60 -80 -80 10M FREQUENCY (Hz) 100M -20 -30 -40 -50 2ND HARMONIC -60 -90 -90 1M fO = 5MHz VOUT = 2VP-P AVCL = 1V/V -10 -80 2ND HARMONIC -90 0 -70 2ND HARMONIC -70 100M DISTORTION vs. RESISTIVE LOAD -40 -50 10M FREQUENCY (Hz) -30 -70 100k 1M 100k 1G DISTORTION vs. FREQUENCY DISTORTION vs. FREQUENCY VOUT = 2VP-P AVCL = 2V/V 100M FREQUENCY (Hz) FREQUENCY (Hz) 0 10M MAX4385E/86E toc08 1M DISTORTION (dBc) 100k MAX4385E/86E toc09 -0.6 -10 1M FREQUENCY (Hz) 1000 OUTPUT IMPEDANCE (Ω) 0.4 0.3 10M FREQUENCY (Hz) FREQUENCY (Hz) 4 0 -0.1 -2 100k VOUT = 100mVP-P 0.3 -2 -6 GAIN (dB) 0.4 MAX4385E/86E toc03 2 1 -1 VOUT = 2VP-P MAX4385E/86E toc06 2 GAIN (dB) 4 3 MAX4385E/86E toc02 VOUT = 100mVP-P GAIN (dB) 3 MAX4385E/86E toc01 4 SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY LARGE-SIGNAL GAIN vs. FREQUENCY SMALL-SIGNAL GAIN vs. FREQUENCY DISTORTION (dBc) MAX4385E/MAX4386E Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection 3RD HARMONIC -100 100k 1M 10M FREQUENCY (Hz) 100M 0 200 400 600 RLOAD (Ω) _______________________________________________________________________________________ 800 1000 1200 Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection DISTORTION vs. VOLTAGE SWING 0 DIFF PHASE (DEGREES) -50 3RD HARMONIC -60 -70 2ND HARMONIC -80 -90 0.5 1.5 1.0 10 20 30 40 0.030 0.025 0.020 0.015 0.010 0.005 0 -0.005 -0.010 2.0 -60 -90 10 20 30 40 100k 50 60 70 80 90 100 IRE -50 -60 10M 100M 1G SMALL-SIGNAL PULSE RESPONSE 0.8 MAX4385E/86E toc14 MAX4385E/86E toc13 -40 1M FREQUENCY (Hz) OUTPUT VOLTAGE SWING vs. RESISTIVE LOAD -30 MAX4385E/86E toc12 -50 -100 0 0.7 OUTPUT VOLTAGE SWING (V) 0.6 AVCL = 1V/V INPUT 50mV/div 0.5 0.4 VCC - VOH 0.3 0.2 OUTPUT 50mV/div VOL - VEE 0.1 -70 1M 10M 100M 1G 0 0 100 200 300 400 FREQUENCY (Hz) RLOAD (Ω) SMALL-SIGNAL PULSE RESPONSE SMALL-SIGNAL PULSE RESPONSE AVCL = 2V/V RF = 200Ω INPUT 25mV/div MAX4385E/86E toc16 100k AVCL = 5V/V RF = 250Ω INPUT 10mV/div OUTPUT 50mV/div OUTPUT 50mV/div 20ns/div 20ns/div 500 LARGE-SIGNAL PULSE RESPONSE AVCL = 1V/V INPUT 1V/div MAX4385E/86E toc18 PSR (dB) -20 -40 -80 POWER-SUPPLY REJECTION vs. FREQUENCY -10 -30 -70 VOLTAGE SWING (VP-P) 0 50 60 70 80 90 100 IRE -20 MAX4385E/86E toc15 -40 0 -10 CMR (dB) -30 MAX4385E/86E toc17 DISTORTION (dBc) -20 0.030 0.025 0.020 0.015 0.010 0.005 0 -0.005 -0.010 MAX4385E/86E toc11 fO = 5MHz AVCL = 1V/V DIFF GAIN (PERCENT) MAX4385E/86E toc10 0 -10 COMMON-MODE REJECTION vs. FREQUENCY DIFFERENTIAL GAIN AND PHASE OUTPUT 1V/div 20ns/div 20ns/div _______________________________________________________________________________________ 5 MAX4385E/MAX4386E Typical Operating Characteristics (continued) (VCC = 5V, VEE = 0, VCM = 1.5V, AVCL = 1V/V, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VCC = 5V, VEE = 0, VCM = 1.5V, AVCL = 1V/V, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.) LARGE-SIGNAL PULSE RESPONSE OUTPUT 1V/div INPUT 200mV/div OUTPUT 1V/div MAX4385E/86E toc21 INPUT 500mV/div AVCL = 5V/V RF = 250Ω 1000 VOLTAGE NOISE (nV/√Hz) AVCL = 2V/V RF = 200Ω VOLTAGE NOISE vs. FREQUENCY MAX4385E/86E toc20 MAX4385E/86E toc19 LARGE-SIGNAL PULSE RESPONSE RL = 100Ω 100 10 1 20ns/div 20ns/div 1 10 100 1k 10k 100k FREQUENCY (Hz) ISOLATION RESISTANCE vs. CAPACITIVE LOAD 12 10 8 6 200 150 100 4 50 2 0 1 10 100 1k 10k 100k 0 0 100 FREQUENCY (Hz) OPEN-LOOP GAIN vs. RESISTIVE LOAD 50 40 30 500 CROSSTALK vs. FREQUENCY SHUTDOWN RESPONSE -20 -30 DISABLE -50 -60 1.5V VOUT 0 -90 0 5V 0 -40 -80 10 100 200 300 400 500 600 700 800 RLOAD (Ω) -70 20 0 CLOAD (pF) -10 CROSSTALK (dB) 60 400 MAX4385E/86E toc26 VCC = 5V 70 300 0 MAX4385E/86E toc25 80 200 MAX4385E/86E toc27 1 -100 100 1k RLOAD (Ω) 6 250 BANDWIDTH (MHz) 10 300 MAX4385E/86E toc23 14 RISO (Ω) RL = 100Ω CURRENT NOISE (pA/√Hz) 16 MAX4385E/86E toc22 100 SMALL-SIGNAL BANDWIDTH vs. LOAD RESISTANCE MAX4385E/86E toc24 CURRENT NOISE vs. FREQUENCY OPEN-LOOP GAIN (dB) MAX4385E/MAX4386E Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection 10k 100k 1M 10M 100M 1G 200ns/div FREQUENCY (Hz) _______________________________________________________________________________________ Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection 3.0 2.5 2.0 1.5 1.0 VCC = 5V 0.5 -6.5 -7.0 -7.5 -8.0 -8.5 -10.0 -50 -25 0 25 50 75 6.5 6.0 5.5 VCC = 5V 4.0 -50 100 7.0 4.5 -9.5 -0.5 7.5 5.0 -9.0 0 MAX4385E/86E toc30 VCC = 5V -6.0 8.0 SUPPLY CURRENT (mA) 3.5 -5.0 -5.5 MAX4385E/86E toc29 INPUT OFFSET VOLTAGE (mV) 4.0 INPUT BIAS CURRENT (µA) MAX4385E/86E toc28 4.5 SUPPLY CURRENT vs. TEMPERATURE INPUT BIAS CURRENT vs. TEMPERATURE INPUT OFFSET VOLTAGE vs. TEMPERATURE -25 0 25 50 75 100 -50 TEMPERATURE (°C) TEMPERATURE (°C) -25 0 25 50 75 100 TEMPERATURE (°C) Pin Description PIN MAX4385E MAX4386E SOT23 SO/TSSOP NAME FUNCTION 1 — OUT Amplifier Output 2 11 VEE Negative Power Supply 3 — IN+ Noninverting Input 4 — IN- Inverting Input Positive Power Supply. Connect a 2.2µF and 0.1µF capacitor to GND. 5 4 VCC — 1 OUTA — 2 INA- Amplifier A Inverting Input — 3 INA+ Amplifier A Noninverting Input — 5 INB+ Amplifier B Noninverting Input — 6 INB- Amplifier B Inverting Input — 7 OUTB Amplifier B Output — 8 OUTC Amplifier C Output — 9 INC- Amplifier C Inverting Input — 10 INC+ Amplifier C Noninverting Input — 12 IND+ Amplifier D Noninverting Input — 13 IND- Amplifier D Inverting Input — 14 OUTD Amplifier A Output Amplifier D Output _______________________________________________________________________________________ 7 MAX4385E/MAX4386E Typical Operating Characteristics (continued) (VCC = 5V, VEE = 0, VCM = 1.5V, AVCL = 1V/V, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.) MAX4385E/MAX4386E Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection Detailed Description The MAX4385E/MAX4386E are single/quad, 5V, rail-torail, voltage-feedback amplifiers that employ currentfeedback techniques to achieve 450V/µs slew rates and 230MHz bandwidths. High ±15kV ESD protection guards against unexpected discharge. Excellent harmonic distortion and differential gain/phase performance make these amplifiers an ideal choice for a wide variety of video and RF signal-processing applications. RF RG VOUT MAX438_E IN VOUT = [1+ (RF / RG)] VIN Applications Information The output voltage swings to within 50mV of each supply rail. Local feedback around the output stage ensures low open-loop output impedance to reduce gain sensitivity to load variations. The input stage permits common-mode voltages beyond VEE and to within 2.25V of the positive supply rail. Figure 1a. Noninverting Gain Configuration RG RF IN Choosing Resistor Values Unity-Gain Configuration The MAX4385E/MAX4386E are internally compensated for unity gain. When configured for unity gain, a 24Ω resistor (RF) in series with the feedback path optimizes AC performance. This resistor improves AC response by reducing the Q of the parallel LC circuit formed by the parasitic feedback capacitance and inductance. Video Line Driver The MAX4385E/MAX4386E are low-power, voltagefeedback amplifiers featuring bandwidths up to 230MHz, 0.1dB gain flatness to 30MHz. They are designed to minimize differential-gain error and differential-phase error to 0.02% and 0.01°, respectively. They have a 14ns settling time to 0.1%, 450V/µs slew rates, and output-current-drive capability of up to 50mA, making them ideal for driving video loads. Inverting and Noninverting Configurations Select the gain-setting feedback (RF) and input (RG) resistor values to fit your application. Large resistor values increase voltage noise and interact with the amplifier’s input and PC board capacitance. This can generate undesirable poles and zeros and decrease bandwidth or cause oscillations. For example, a noninverting gain-of-two configuration (RF = RG) using 1kΩ resistors, combined with 8pF of amplifier input capacitance and 1pF of PC board capacitance, causes a pole at 35.4MHz. Since this pole is within the amplifier bandwidth, it jeopardizes stability. Reducing the 1kΩ resistors to 100Ω extends the pole frequency to 353.8MHz, but could limit output swing by adding 200Ω in parallel with the amplifier’s load resistor (Figures 1a and 1b). 8 VOUT MAX438_E VOUT = -(RF / RG) VIN Figure 1b. Inverting Gain Configuration Layout and Power-Supply Bypassing These amplifiers operate from a single 5V power supply. Bypass VCC to ground with 0.1µF and 2.2µF capacitors as close to the pin as possible. Maxim recommends using microstrip and stripline techniques to obtain full bandwidth. To ensure that the PC board does not degrade the amplifier’s performance, design it for a frequency greater than 1GHz. Pay careful attention to inputs and outputs to avoid large parasitic capacitance. Regardless of whether you use a constant-impedance board, observe the following design guidelines: • Do not use wire-wrap boards; they are too inductive. • Do not use IC sockets; they increase parasitic capacitance and inductance. • Use surface mount instead of through-hole components for better high-frequency performance. • Use a PC board with at least two layers; it should be as free from voids as possible. • Keep signal lines as short and as straight as possible. Do not make 90° turns; round all corners. _______________________________________________________________________________________ Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection MAX4385E/MAX4386E ISOLATION RESISTANCE vs. CAPACITIVE LOAD 16 RG RF 15 MAX438_E VIN VOUT RISO (Ω) 14 RISO CL 13 12 11 10 9 0 50 100 150 200 250 300 350 400 450 500 CLOAD (pF) Figure 2. Driving a Capacitive Load Through an Isolation Resistor Figure 3. Isolation Resistance vs. Capacitive Load Rail-to-Rail Outputs, Ground-Sensing Inputs 5 CL = 15pF 4 3 GAIN (dB) The input common-mode range extends from (VEE 200mV) to (VCC - 2.25V) with excellent common-mode rejection. Beyond this range, the amplifier output is a nonlinear function of the input, but does not undergo phase reversal or latchup. 6 The output swings to within 50mV of either power-supply rail with a 2kΩ load. The input ground sensing and the rail-to-rail output substantially increase the dynamic range. The input can swing 2.95VP-P and the output can swing 4.9VP-P with minimal distortion. 2 CL = 10pF 1 0 CL = 5pF -1 -2 -3 -4 100k 1M Output Capacitive Loading and Stability 100M 1G Figure 4. Small-Signal Gain vs. Frequency with Load Capacitance and No Isolation Resistor 3 2 RISO = 15Ω CL = 47pF 1 0 GAIN (dB) The MAX4385E/MAX4386E are optimized for AC performance and do not drive highly reactive loads, which decreases phase margin and may produce excessive ringing and oscillation. Figure 2 shows a circuit that eliminates this problem. Figure 3 is a graph of the Optimal Isolation Resistor (RS) vs. Capacitive Load. Figure 4 shows how a capacitive load causes excessive peaking of the amplifier’s frequency response if the capacitor is not isolated from the amplifier by a resistor. A small isolation resistor (usually 10Ω to 15Ω) placed before the reactive load prevents ringing and oscillation. At higher capacitive loads, the interaction of the load capacitance and the isolation resistor controls the AC performance. Figure 5 shows the effect of a 15Ω isolation resistor on closed-loop response. 10M FREQUENCY (Hz) -1 CL = 68pF -2 CL = 120pF -3 -4 -5 -6 -7 100k 1M 10M 100M 1G FREQUENCY (Hz) Figure 5. Small-Signal Gain vs. Frequency with Load Capacitance and 27Ω Isolation Resistor _______________________________________________________________________________________ 9 MAX4385E/MAX4386E Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection ESD Protection As with all Maxim devices, ESD protection structures are incorporated on all pins to protect against ESD encountered during handling and assembly. Input and output pins of the MAX4385E/MAX4386E have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures enabling these pins to withstand ESD up to ±15kV without damage when placed in the test circuit (Figure 6). The MAX4385E/MAX4386E are characterized for protection to the following limits: • ±15kV using the Human Body Model • ±8kV using the Contact Discharge method specified in IEC 1000-4-2 5V CBYPASS 2.2µF TEST POINT A 75Ω 75Ω TEST POINT B MAX438_E VEE 220Ω 220Ω • ±15kV using the Air-Gap Discharge method specified in IEC 1000-4-2 Human Body Model Figure 7 shows the Human Body Model, and Figure 8 shows the current waveform it generates when discharged into a low impedance. This model consists of a 150pF capacitor charged to the ESD voltage of interest, and then discharged into the test device through a 1.5kΩ resistor. IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to ICs. The MAX4385E/MAX4386E enable the design of equipment that meets the highest level (Level 4) of IEC 1000-4-2 without the need for additional ESD protection components. The major difference between tests done using the Human Body Model and IEC 10004-2 is higher peak current in IEC 1000-4-2. Because series resistance is lower in the IEC 1000-4-2 model, the ESD-withstand voltage measured to this standard is generally lower than that measured using the Human Body. Figure 10 shows the IEC 1000-4-2 model and Figure 9 shows the current waveform for the ±8kV IEC 1000-4-2 Level 4 ESD Contact Discharge test. The AirGap test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized. Figure 6. ESD Test Circuit RD = 1.5kΩ RC = 1MΩ HIGHVOLTAGE DC SOURCE CHARGE CURRENT LIMIT RESISTOR CS = 150pF DISCHARGE RESISTANCE DEVICE UNDER TEST STORAGE CAPACITOR Figure 7. Human Body ESD Model IP 100% 90% Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM Figure 8. Human Body Current Waveform 10 ______________________________________________________________________________________ Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection HIGHVOLTAGE DC SOURCE CS 150pF 100% 90% DISCHARGE RESISTANCE I PEAK CHARGE CURRENT LIMIT RESISTOR I RD 330Ω DEVICE UNDER TEST STORAGE CAPACITOR 10% t r = 0.7ns TO 1ns t 30ns 60ns Figure 9. IEC 1000-4-2 ESD Test Model Figure 10. IEC 1000-4-2 ESD Generator Current Waveform Pin Configurations (continued) Chip Information MAX4385E TRANSISTOR COUNT: 124 MAX4386E TRANSISTOR COUNT: 264 TOP VIEW OUTA 1 14 OUTD INA- 2 13 IND- INA+ 3 12 IND+ VCC 4 MAX4386E 11 VEE INB+ 5 10 INC+ INB- 6 9 INC- OUTB 7 8 OUTC TSSOP/SO ______________________________________________________________________________________ 11 MAX4385E/MAX4386E RC 50MΩ TO 100MΩ Package Information SOT5L.EPS (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.) TSSOP,NO PADS.EPS MAX4385E/MAX4386E Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection 12 ______________________________________________________________________________________ Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection SOICN.EPS 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-1737-7600____________________13 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX4385E/MAX4386E Package Information (continued) (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.) 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