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19-2422; Rev 0; 4/02
Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and 15kV ESD Protection
MAX4385E/MAX4386E
General Description
The MAX4385E/MAX4386E op amps are unity-gain stable devices that combine high-speed performance, Rail-to-Rail (R) 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/s slew rate.
Features
o ESD-Protected Inputs and Outputs 15kV--Human Body Model 8kV--IEC 1000-4-2 Contact Discharge 15kV--IEC 1000-4-2 Air-Gap Discharge o Low Cost and High Speed 230MHz -3dB Bandwidth 30MHz 0.1dB Gain Flatness 450V/s Slew Rate o Rail-to-Rail Outputs o Input Common-Mode Range Extends Beyond VEE o Low Differential Gain/Phase: 0.02%/0.01 o Low Distortion at 5MHz -60dBc SFDR -58dB Total Harmonic Distortion o Ultra-Small 5-Pin SOT23 and 14-Pin TSSOP Packages
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
Ordering Information
PART MAX4385EEUK-T MAX4386EESD MAX4386EEUD TEMP RANGE -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 5 SOT23-5 14 SO 14 TSSOP TOP MARK ADZL -- --
Typical Operating Circuit
5V 2.2F IN OUT 1 75 MAX4385E 75 IN+ 3 220 75 Zo = 75 VEE 2 OUT
Pin Configurations
TOP VIEW
5 VCC
MAX4385E
4
IN-
220
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 1
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.
Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and 15kV ESD Protection
MAX4385E/MAX4386E
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 = +70C) 5-Pin SOT23 (derate 8.7mW/C above +70C)...........696mW 14-Pin SO (derate 8.33mW/C above +70C).............667mW 14-Pin TSSOP (derate 10mW/C above +70C) .........727mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 = 2.2F, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Input Common-Mode Voltage Range Input Offset Voltage Input Offset Voltage Matching Input Offset Voltage Tempco Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio TCVOS IB IOS RIN CMRR Differential mode (-1V VIN +1V) Common mode (-0.2V VCM +2.75V) VEE - 0.2V VCM VCC - 2.25V 0.25V VOUT 4.75V, RL = 2k Open-Loop Gain AVOL 0.8V VOUT 4.5V, RL = 150 1V VOUT 4V, RL = 50 RL = 2k RL = 150 Output Voltage Swing VOUT RL = 75 RL = 75 to ground Output Current Output Short-Circuit Current Open-Loop Output Resistance Power-Supply Rejection Ratio IOUT ISC ROUT PSRR VS = 4.5V to 5.5V 50 VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE 40 25 70 50 48 SYMBOL VCM VOS CONDITIONS Guaranteed by CMRR TA = +25C TA = -40C to +85C MAX4386E 1 8 6.5 0.5 70 3 95 61 63 58 0.05 0.05 0.3 0.25 0.5 0.5 1 0.025 55 50 100 8 62 0.270 0.150 0.5 0.8 0.8 1.75 1.7 0.125 mA mA dB V dB 20 7 MIN VEE 0.2 0.2 TYP MAX VCC 2.25 20 28 UNITS V mV mV V/C A A k M dB
Sinking from RL = 50 to VCC Sourcing into RL = 50 to VEE Sinking or sourcing
2
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Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and 15kV ESD Protection
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5V, VEE = 0, VCM = VCC/2, VOUT = VCC/2, RL = to VCC/2, CBYPASS = 2.2F, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Operating Supply Voltage Range Quiescent Supply Current (per Amplifier) ESD Protection Voltage (Note 2) SYMBOL VS IS Human Body Model IEC 1000-4-2 Contact Discharge IEC 1000-4-2 Air-Gap Discharge CONDITIONS Guaranteed by PSRR MIN 4.5 5.5 15 8 15 kV TYP MAX 5.5 9 UNITS V mA
MAX4385E/MAX4386E
AC ELECTRICAL CHARACTERISTICS
(VCC = 5V, VEE = 0, VCM = 1.5V, RL = 100 to VCC/2, VOUT = VCC/2, AVCL = 1V/V, TA = +25C, unless otherwise noted.)
PARAMETER Small-Signal -3dB Bandwidth Large-Signal -3dB Bandwidth Small-Signal 0.1dB Gain Flatness Large-Signal 0.1dB Gain Flatness Slew Rate Settling Time to 0.1% Rise/Fall Time Spurious-Free Dynamic Range Harmonic Distortion Two-Tone, Third-Order Intermodulation Distortion Channel-to-Channel Isolation Input 1dB Compression Point Differential Phase Error Differential Gain Error Input Noise-Voltage Density Input Noise-Current Density Input Capacitance Output Impedance DP DG en in CIN ZOUT f = 10MHz SYMBOL BWSS BWLS BW0.1dBSS BW0.1dBLS SR tS tR , tF SFDR HD CONDITIONS VOUT = 100mVP-P VOUT = 2VP-P VOUT = 100mVP-P VOUT = 2VP-P VOUT = 2V step VOUT = 2V step VOUT = 100mVP-P fC = 5MHz, VOUT = 2VP-P 2nd harmonic fC = 5MHz, VOUT = 2VP-P 3rd harmonic total harmonic MIN TYP 230 180 33 30 450 14 4 -60 -70 -60 -58 -60 -95 13 0.01 0.02 11.5 2 8 2.2 dBc dB dBm Degrees % nV/Hz pA/Hz pF dBc MAX UNITS MHz MHz MHz MHz V/s ns ns dBc
IP3 CHISO
f1 = 4.7MHz, f2 = 4.8MHz, VOUT = 1VP-P Specified at DC fC = 10MHz, AVCL = 2V/V NTSC, RL = 150 NTSC, RL = 150 f = 10kHz f = 10kHz
Note 1: All devices are 100% production tested at TA = +25C. 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).
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3
Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and 15kV ESD Protection
MAX4385E/MAX4386E
Typical Operating Characteristics
(VCC = 5V, VEE = 0, VCM = 1.5V, AVCL = 1V/V, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.)
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4385E/86E toc01
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4385E/86E toc02
SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY
0.3 0.2 0.1 GAIN (dB) 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 VOUT = 100mVP-P
MAX4385E/86E toc03
4 3 2 1 GAIN (dB) VOUT = 100mVP-P
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 VOUT = 2VP-P
0.4
0 -1 -2 -3 -4 -5 -6 100k 1M 10M FREQUENCY (Hz) 100M 1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY
0.3 0.2 0.1 GAIN (dB) 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 100k 1M 10M FREQUENCY (Hz) 100M 1G 0.01 VOUT = 2VP-P
MAX4385E/86E toc04
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4385E/86E toc05
DISTORTION vs. FREQUENCY
-10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 3RD HARMONIC VOUT = 2VP-P AVCL = 1V/V
MAX4385E/86E toc06
0.4
1000
0
100 OUTPUT IMPEDANCE ()
10
1
0.1
-80 -90 -100 100k 1M 10M FREQUENCY (Hz) 100M 1G 100k 1M
2ND HARMONIC
10M
100M
FREQUENCY (Hz)
DISTORTION vs. FREQUENCY
MAX4385E/86E toc07
DISTORTION vs. FREQUENCY
MAX4385E/86E toc08
DISTORTION vs. RESISTIVE LOAD
-10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 3RD HARMONIC 0 200 400 600 RLOAD () 800 1000 1200 2ND HARMONIC fO = 5MHz VOUT = 2VP-P AVCL = 1V/V
MAX4385E/86E toc09
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 2ND HARMONIC -90 100k 1M 10M 3RD HARMONIC VOUT = 2VP-P AVCL = 2V/V
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 2ND HARMONIC -70 -80 -90 3RD HARMONIC VOUT = 2VP-P AVCL = 5V/V
0
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
4
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Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and 15kV ESD Protection
Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0, VCM = 1.5V, AVCL = 1V/V, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.)
MAX4385E/MAX4386E
DISTORTION vs. VOLTAGE SWING
DIFF GAIN (PERCENT)
MAX4385E/86E toc10
DIFFERENTIAL GAIN AND PHASE
0.030 0.025 0.020 0.015 0.010 0.005 0 -0.005 -0.010 0 DIFF PHASE (DEGREES) 10 20 30 40 0.030 0.025 0.020 0.015 0.010 0.005 0 -0.005 -0.010 0 10 20 30 40
MAX4385E/86E toc11
COMMON-MODE REJECTION vs. FREQUENCY
-10 -20 -30 CMR (dB) -40 -50 -60 -70 -80 -90 -100
MAX4385E/86E toc12
0 -10 -20 DISTORTION (dBc) -30 -40 -50 3RD HARMONIC -60 -70 -80 -90 0.5 1.0 1.5 2ND HARMONIC fO = 5MHz AVCL = 1V/V
0
50 60 70 80 90 100 IRE
2.0
VOLTAGE SWING (VP-P)
50 60 70 80 90 100 IRE
100k
1M
10M FREQUENCY (Hz)
100M
1G
POWER-SUPPLY REJECTION vs. FREQUENCY
MAX4385E/86E toc13
OUTPUT VOLTAGE SWING vs. RESISTIVE LOAD
MAX4385E/86E toc14
SMALL-SIGNAL PULSE RESPONSE
AVCL = 1V/V INPUT 50mV/div
MAX4385E/86E toc15
0 -10 -20 PSR (dB) -30 -40 -50 -60 -70 100k 1M 10M FREQUENCY (Hz) 100M
0.8 0.7 OUTPUT VOLTAGE SWING (V) 0.6 0.5 0.4 0.3 0.2 0.1 VCC - VOH VOL - VEE
OUTPUT 50mV/div
1G
0 0 100 200 300 400 500 RLOAD ()
20ns/div
SMALL-SIGNAL PULSE RESPONSE
MAX4385E/86E toc16
SMALL-SIGNAL PULSE RESPONSE
AVCL = 5V/V INPUT 10mV/div RF = 250
MAX4385E/86E toc17
LARGE-SIGNAL PULSE RESPONSE
AVCL = 1V/V INPUT 1V/div
MAX4385E/86E toc18
AVCL = 2V/V RF = 200 INPUT 25mV/div
OUTPUT 50mV/div
OUTPUT 50mV/div
OUTPUT 1V/div
20ns/div
20ns/div
20ns/div
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5
Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and 15kV ESD Protection
MAX4385E/MAX4386E
Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0, VCM = 1.5V, AVCL = 1V/V, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.)
LARGE-SIGNAL PULSE RESPONSE
MAX4385E/86E toc19
LARGE-SIGNAL PULSE RESPONSE
MAX4385E/86E toc20
VOLTAGE NOISE vs. FREQUENCY
RL = 100
MAX4385E/86E toc21
AVCL = 2V/V RF = 200 INPUT 500mV/div
AVCL = 5V/V RF = 250 INPUT 200mV/div
1000
VOLTAGE NOISE (nV/Hz)
100
OUTPUT 1V/div
OUTPUT 1V/div
10
1 20ns/div 20ns/div 1 10 100 1k 10k 100k FREQUENCY (Hz)
CURRENT NOISE vs. FREQUENCY
MAX4385E/86E toc22
ISOLATION RESISTANCE vs. CAPACITIVE LOAD
MAX4385E/86E toc23
SMALL-SIGNAL BANDWIDTH vs. LOAD RESISTANCE
MAX4385E/86E toc24
100 RL = 100 CURRENT NOISE (pA/Hz)
16 14 12 RISO () 10 8 6 4 2
300 250 BANDWIDTH (MHz) 200 150 100 50 0
10
1 1 10 100 1k 10k 100k FREQUENCY (Hz)
0 0 100 200 300 400 500 CLOAD (pF)
0
100 200 300 400 500 600 700 800 RLOAD ()
OPEN-LOOP GAIN vs. RESISTIVE LOAD
MAX4385E/86E toc25
CROSSTALK vs. FREQUENCY
MAX4385E/86E toc26
SHUTDOWN RESPONSE
5V DISABLE 0
MAX4385E/86E toc27
80 VCC = 5V 70 OPEN-LOOP GAIN (dB) 60 50 40 30 20 10 0 100 1k RLOAD ()
0 -10 -20 CROSSTALK (dB) -30 -40 -50 -60 -70 -80 -90 -100
1.5V VOUT 0 100k 1M 10M FREQUENCY (Hz) 100M 1G 200ns/div
10k
6
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Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and 15kV ESD Protection
MAX4385E/MAX4386E
Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0, VCM = 1.5V, AVCL = 1V/V, RL = 100 to VCC/2, TA = +25C, unless otherwise noted.)
INPUT OFFSET VOLTAGE vs. TEMPERATURE
4.0 INPUT OFFSET VOLTAGE (mV) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -0.5 -50 -25 0 25 50 75 100 TEMPERATURE (C) VCC = 5V
MAX4385E/86E toc28
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4385E/86E toc29
SUPPLY CURRENT vs. TEMPERATURE
7.5 SUPPLY CURRENT (mA) 7.0 6.5 6.0 5.5 5.0 4.5 4.0 VCC = 5V
MAX4385E/86E toc30
4.5
-5.0 -5.5 INPUT BIAS CURRENT (A) -6.0 -6.5 -7.0 -7.5 -8.0 -8.5 -9.0 -9.5 -10.0 -50 -25 0 25 50 75 VCC = 5V
8.0
100
-50
-25
0
25
50
75
100
TEMPERATURE (C)
TEMPERATURE (C)
Pin Description
PIN MAX4385E SOT23 1 2 3 4 5 -- -- -- -- -- -- -- -- -- -- -- -- MAX4386E SO/TSSOP -- 11 -- -- 4 1 2 3 5 6 7 8 9 10 12 13 14 OUT VEE IN+ INVCC OUTA INAINA+ INB+ INBOUTB OUTC INCINC+ IND+ INDOUTD Amplifier Output Negative Power Supply Noninverting Input Inverting Input Positive Power Supply. Connect a 2.2F and 0.1F capacitor to GND. Amplifier A Output Amplifier A Inverting Input Amplifier A Noninverting Input Amplifier B Noninverting Input Amplifier B Inverting Input Amplifier B Output Amplifier C Output Amplifier C Inverting Input Amplifier C Noninverting Input Amplifier D Noninverting Input Amplifier D Inverting Input Amplifier D Output NAME FUNCTION
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7
Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and 15kV ESD Protection
MAX4385E/MAX4386E
Detailed Description
The MAX4385E/MAX4386E are single/quad, 5V, rail-torail, voltage-feedback amplifiers that employ currentfeedback techniques to achieve 450V/s 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.
RG RF
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 IN
RF
Choosing Resistor Values
Unity-Gain Configuration The MAX4385E/MAX4386E are internally compensated for unity gain. When configured for unity gain, a 24 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/s 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 1k 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 1k resistors to 100 extends the pole frequency to 353.8MHz, but could limit output swing by adding 200 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 0.1F and 2.2F 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.
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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 14 RISO ()
RISO
MAX438_E
VOUT CL
13 12 11 10 9 0 50 100 150 200 250 300 350 400 450 500 CLOAD (pF)
VIN
Figure 2. Driving a Capacitive Load Through an Isolation Resistor
Figure 3. Isolation Resistance vs. Capacitive Load
Rail-to-Rail Outputs, Ground-Sensing Inputs
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. The output swings to within 50mV of either power-supply rail with a 2k 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.
6 5 4 3 GAIN (dB) 2 1 0 -1 -2 -3 -4 100k 1M 10M FREQUENCY (Hz) 100M 1G CL = 5pF CL = 10pF CL = 15pF
Output Capacitive Loading and Stability
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 10 to 15) 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 15 isolation resistor on closed-loop response.
Figure 4. Small-Signal Gain vs. Frequency with Load Capacitance and No Isolation Resistor
3 2 1 0 GAIN (dB) -1 -2 -3 -4 -5 -6 -7 100k 1M 10M FREQUENCY (Hz) 100M 1G CL = 120pF CL = 68pF RISO = 15 CL = 47pF
Figure 5. Small-Signal Gain vs. Frequency with Load Capacitance and 27 Isolation Resistor _______________________________________________________________________________________ 9
Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and 15kV ESD Protection
MAX4385E/MAX4386E
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 * 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 1.5k 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
5V CBYPASS 2.2F
TEST POINT A 75 MAX438_E VEE
75 TEST POINT B
220
220
RC = 1M CHARGE CURRENT LIMIT RESISTOR CS = 150pF
RD = 1.5k DISCHARGE RESISTANCE STORAGE CAPACITOR
HIGHVOLTAGE DC SOURCE
DEVICE UNDER TEST
Figure 7. Human Body ESD Model
IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME
Ir
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
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
MAX4385E/MAX4386E
RC 50M TO 100M CHARGE CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE
I
RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
I PEAK
100% 90%
CS 150pF
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 INAINA+ 2 3 14 OUTD 13 IND12 IND+
VCC 4 INB+ 5 INB- 6 OUTB 7
MAX4386E
11 VEE 10 INC+ 9 8 INCOUTC
TSSOP/SO
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11
Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and 15kV ESD Protection
MAX4385E/MAX4386E
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.)
SOT5L.EPS
12
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TSSOP,NO PADS.EPS
Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and 15kV ESD Protection
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.)
MAX4385E/MAX4386E
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 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
SOICN.EPS
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