General Description
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 Air-Gap
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
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 V
EE
♦ 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
MAX4385E/MAX4386E
Low-Cost, 230MHz, Single/Quad Op Amps with
Rail-to-Rail Outputs and ±15kV ESD Protection
220Ω
220Ω
75Ω
75Ω
OUT
VIDEO LINE DRIVER
Z
o
= 75Ω
MAX4385E
5V
2.2µF
75Ω
IN
Typical Operating Circuit
19-2422; Rev 1; 9/05
Ordering Information
________________________________________________________________ Maxim Integrated Products 1
V
EE
IN-IN+
15V
CC
OUT
MAX4385E
SOT23
TOP VIEW
2
34
Pin Configurations
Pin Configurations continued at end of data sheet.
PART
TEMP RANGE
PIN-
TOP
MARK
MAX4385EEUK-T
ADZL
MAX4386EESD
14 SO —
MAX4386EEUD
—
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.
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
PACKAGE
-40°C to +85°C5 SOT23-5
-40°C to +85°C
-40°C to +85°C 14 TSSOP
MAX4385E/MAX4386E
Low-Cost, 230MHz, Single/Quad Op Amps with
Rail-to-Rail Outputs and ±15kV ESD Protection
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (VCCto VEE) .........................-0.3V to +6V
IN_+, IN_-, OUT_,.............................(V
EE
- 0.3V) to (VCC+ 0.3V)
Output Short-Circuit Duration to
V
CC
or VEE.............................................................Continuous
Continuous Power Dissipation (T
A
= +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, V
OUT
= VCC/2, RL= ∞ to VCC/2, C
BYPASS
= 2.2µF, TA= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
CONDITIONS
UNITS
Input Common-Mode Voltage
Range
V
CM
Guaranteed by CMRR
0.2
V
TA = +25°C
0.2 20
Input Offset Voltage
V
OS
TA = -40°C to +85°C
28
mV
Input Offset Voltage Matching MAX4386E 1 mV
Input Offset Voltage Tempco
8
µV/°C
Input Bias Current
I
B
6.5 20 µA
Input Offset Current
I
OS
0.5 7 µA
Differential mode (-1V ≤ V
IN
≤ +1V)
70
kΩ
Input Resistance
R
IN
Common mode (-0.2V ≤ VCM ≤ +2.75V)
3
MΩ
Common-Mode Rejection Ratio
VEE - 0.2V ≤ VCM ≤ V
CC
- 2.25V
70 95 dB
0.25V ≤ V
OUT
≤ 4.75V, RL = 2kΩ
50 61
0.8V ≤ V
OUT
≤ 4.5V, RL = 150Ω
48 63
Open-Loop Gain
A
VOL
1V ≤ V
OUT
≤ 4V, RL = 50Ω
58
dB
VCC - V
OH
RL = 2kΩ
V
OL
- V
EE
VCC - V
OH
0.3 0.5
RL = 150Ω
V
OL
- V
EE
0.8
VCC - V
OH
0.5 0.8
RL = 75Ω
V
OL
- V
EE
0.5
VCC - V
OH
1 1.7
Output Voltage Swing
V
OUT
RL = 75Ω to
ground V
OL
- V
EE
V
Sinking from RL = 50Ω to V
CC
40 55
Output Current
I
OUT
Sourcing into RL = 50Ω to V
EE
25 50
mA
Output Short-Circuit Current
I
SC
Sinking or sourcing
mA
Open-Loop Output Resistance
R
OUT
8
Ω
Power-Supply Rejection Ratio PSRR
V
S
= 4.5V to 5.5V
50 62 dB
SYMBOL
MIN TYP MAX
VEE -
V
2.25
CC
-
TC
VOS
CMRR
0.05 0.270
0.05 0.150
0.25
0.025 0.125
±100
1.75
MAX4385E/MAX4386E
Low-Cost, 230MHz, Single/Quad Op Amps with
Rail-to-Rail Outputs and ±15kV ESD Protection
_______________________________________________________________________________________ 3
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).
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC= 5V, VEE= 0, VCM= VCC/2, V
OUT
= VCC/2, RL= ∞ to VCC/2, C
BYPASS
= 2.2µF, TA= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
CONDITIONS
UNITS
Operating Supply Voltage
Range
V
S
Guaranteed by PSRR 4.5 5.5 V
Quiescent Supply Current
(per Amplifier)
I
S
5.5 9 mA
Human Body Model
IEC 1000-4-2 Contact Discharge ±8
ESD Protection Voltage
(Note 2)
IEC 1000-4-2 Air-Gap Discharge
kV
AC ELECTRICAL CHARACTERISTICS
(VCC= 5V, VEE= 0, VCM= 1.5V, RL= 100Ω to VCC/2, V
OUT
= VCC/2, A
VCL
= 1V/V, TA= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN
UNITS
Small-Signal -3dB Bandwidth BW
SS
V
OUT
= 100mV
P-P
230 MHz
Large-Signal -3dB Bandwidth BW
LS
V
OUT
= 2V
P-P
180 MHz
Small-Signal 0.1dB Gain
Flatness
V
OUT
= 100mV
P-P
33 MHz
Large-Signal 0.1dB Gain
Flatness
V
OUT
= 2V
P-P
30 MHz
Slew Rate SR V
OUT
= 2V step 450 V/µs
Settling Time to 0.1% t
S
V
OUT
= 2V step 14 ns
Rise/Fall Time tR , t
F
V
OUT
= 100mV
P-P
4ns
Spurious-Free Dynamic Range
SFDR fC = 5MHz, V
OUT
= 2V
P-P
-60 dBc
2nd harmonic -70
3rd harmonic -60Harmonic Distortion HD
f
C
= 5MHz,
V
OUT
= 2V
P-P
total harmonic
-58
dBc
Two-Tone, Third-Order
Intermodulation Distortion
IP3
f1 = 4.7MHz, f2 = 4.8MHz,
V
OUT
= 1V
P-P
-60 dBc
Channel-to-Channel Isolation CH
ISO
Specified at DC -95 dB
Input 1dB Compression Point fC = 10MHz, A
VCL
= 2V/V 13 dBm
Differential Phase Error DP NTSC, RL = 150Ω
Degrees
Differential Gain Error DG NTSC, RL = 150Ω
%
Input Noise-Voltage Density e
n
f = 10kHz
nV/√Hz
Input Noise-Current Density i
n
f = 10kHz 2
pA/√Hz
Input Capacitance C
IN
8pF
Output Impedance Z
OUT
f = 10MHz 2.2 Ω
SYMBOL
BW
0.1dBSS
BW
0.1dBLS
MIN TYP MAX
±15
±15
TYP MAX
0.01
0.02
11.5
MAX4385E/MAX4386E
Low-Cost, 230MHz, Single/Quad Op Amps with
Rail-to-Rail Outputs and ±15kV ESD Protection
4 _______________________________________________________________________________________
0.4
-0.6
100k 1M 10M 100M 1G
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
-0.4
MAX4385E/86E toc04
FREQUENCY (Hz)
GAIN (dB)
-0.2
0
0.2
0.1
-0.1
-0.3
-0.5
0.3
V
OUT
= 2V
P-P
100k 10M1M 100M 1G
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4385E/86E toc05
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
1000
0.01
0.1
1
10
100
2ND HARMONIC
3RD HARMONIC
-10
-100
100k 100M10M1M
DISTORTION vs. FREQUENCY
-70
-90
-30
-50
0
-60
-80
-20
-40
MAX4385E/86E toc06
FREQUENCY (Hz)
DISTORTION (dBc)
V
OUT
= 2V
P-P
A
VCL
= 1V/V
2ND HARMONIC
3RD HARMONIC
-10
100k 100M10M1M
DISTORTION vs. FREQUENCY
-70
-90
-30
-50
0
-60
-80
-20
-40
MAX4385E/86E toc07
FREQUENCY (Hz)
DISTORTION (dBc)
V
OUT
= 2V
P-P
A
VCL
= 2V/V
2ND HARMONIC
3RD HARMONIC
-10
100k 100M10M1M
DISTORTION vs. FREQUENCY
-70
-90
-30
-50
0
-60
-80
-20
-40
MAX4385E/86E toc08
FREQUENCY (Hz)
DISTORTION (dBc)
V
OUT
= 2V
P-P
A
VCL
= 5V/V
-100
-70
-80
-90
-60
-50
-40
-30
-20
-10
0
0 400200 600 800 1000 1200
DISTORTION vs. RESISTIVE LOAD
MAX4385E/86E toc09
R
LOAD
(Ω)
DISTORTION (dBc)
2ND HARMONIC
3RD HARMONIC
fO = 5MHz
V
OUT
= 2V
P-P
A
VCL
= 1V/V
4
-6
100k 10M 100M1M 1G
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4385E/86E toc01
FREQUENCY (Hz)
GAIN (dB)
-5
-4
-3
-2
-1
0
1
2
3
V
OUT
= 100mV
P-P
4
-6
100k 10M 100M1M 1G
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX4385E/86E toc02
FREQUENCY (Hz)
GAIN (dB)
-5
-4
-3
-2
-1
0
1
2
3
V
OUT
= 2V
P-P
0.4
-0.6
100k 10M 100M1M 1G
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX4385E/86E toc03
FREQUENCY (Hz)
GAIN (dB)
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
V
OUT
= 100mV
P-P
Typical Operating Characteristics
(VCC= 5V, VEE= 0, VCM= 1.5V, A
VCL
= 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
_______________________________________________________________________________________ 5
Typical Operating Characteristics (continued)
(VCC= 5V, VEE= 0, VCM= 1.5V, A
VCL
= 1V/V, RL= 100Ω to VCC/2, TA = +25°C, unless otherwise noted.)
-70
-80
-90
-60
-50
-40
-30
-20
-10
0
0.5 1.0
1.5
2.0
DISTORTION vs. VOLTAGE SWING
MAX4385E/86E toc10
VOLTAGE SWING (V
P-P
)
DISTORTION (dBc)
fO = 5MHz
A
VCL
= 1V/V
3RD HARMONIC
2ND HARMONIC
0102030405060708090100
DIFFERENTIAL GAIN AND PHASE
-0.010
0
0.005
0.015
0.025
0.030
IRE
DIFF PHASE (DEGREES)
DIFF GAIN (PERCENT)
MAX4385E/86E toc11
IRE
-0.005
0.020
0.010
-0.010
0.005
0.010
0.020
0.030
0
0.025
0.015
-0.005
0102030405060708090100
0
-100
100k 10M 100M1M 1G
COMMON-MODE REJECTION
vs. FREQUENCY
MAX4385E/86E toc12
FREQUENCY (Hz)
CMR (dB)
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-10
-20
-30
-40
-50
-60
-70
100k 10M 100M1M 1G
POWER-SUPPLY REJECTION
vs. FREQUENCY
MAX4385E/86E toc13
FREQUENCY (Hz)
PSR (dB)
0
0.2
0.1
0.3
0.6
0.7
0.5
0.4
0.8
0 200
300 400 500
100
OUTPUT VOLTAGE SWING
vs. RESISTIVE LOAD
MAX4385E/86E toc14
R
LOAD
(Ω)
OUTPUT VOLTAGE SWING (V)
V
CC
- V
OH
V
OL
- V
EE
MAX4385E/86E toc15
INPUT
50mV/div
OUTPUT
50mV/div
SMALL-SIGNAL PULSE RESPONSE
20ns/div
A
VCL
= 1V/V
MAX4385E/86E toc16
INPUT
25mV/div
OUTPUT
50mV/div
SMALL-SIGNAL PULSE RESPONSE
20ns/div
A
VCL
= 2V/V
RF = 200Ω
MAX4385E/86E toc17
INPUT
10mV/div
OUTPUT
50mV/div
SMALL-SIGNAL PULSE RESPONSE
20ns/div
A
VCL
= 5V/V
RF = 250Ω
MAX4385E/86E toc18
INPUT
1V/div
OUTPUT
1V/div
LARGE-SIGNAL PULSE RESPONSE
20ns/div
A
VCL
= 1V/V
MAX4385E/MAX4386E
Low-Cost, 230MHz, Single/Quad Op Amps with
Rail-to-Rail Outputs and ±15kV ESD Protection
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VCC= 5V, VEE= 0, VCM= 1.5V, A
VCL
= 1V/V, RL= 100Ω to VCC/2, TA = +25°C, unless otherwise noted.)
CURRENT NOISE vs. FREQUENCY
MAX4385E/86E toc22
FREQUENCY (Hz)
CURRENT NOISE (pA/√Hz)
10 100 1k 10k
10
100
1
1 100k
RL = 100Ω
2
6
4
10
8
14
12
16
0 200100 300 400 500
ISOLATION RESISTANCE
vs. CAPACITIVE LOAD
MAX4385E/86E toc23
C
LOAD
(pF)
R
ISO
(Ω)
0
0
50
100
150
200
250
300
0 200100 300 400 500 600 700 800
SMALL-SIGNAL BANDWIDTH
vs. LOAD RESISTANCE
MAX4385E/86E toc24
R
LOAD
(Ω)
BANDWIDTH (MHz)
80
0
100 1k 10k
OPEN-LOOP GAIN vs. RESISTIVE LOAD
20
10
MAX4385E/86E toc25
R
LOAD
(Ω)
OPEN-LOOP GAIN (dB)
40
30
50
60
70
VCC = 5V
CROSSTALK vs. FREQUENCY
MAX4385E/86E toc26
FREQUENCY (Hz)
CROSSTALK (dB)
-100
-70
-80
-90
-60
-50
-40
-30
-20
-10
0
100k 1M 10M 100M 1G
MAX4385E/86E toc19
INPUT
500mV/div
OUTPUT
1V/div
LARGE-SIGNAL PULSE RESPONSE
20ns/div
A
VCL
= 2V/V
R
F
= 200Ω
MAX4385E/86E toc20
INPUT
200mV/div
OUTPUT
1V/div
LARGE-SIGNAL PULSE RESPONSE
20ns/div
A
VCL
= 5V/V
RF = 250Ω
VOLTAGE NOISE vs. FREQUENCY
MAX4385E/86E toc21
FREQUENCY (Hz)
VOLTAGE NOISE (nV/√Hz)
10k1k10010
10
100
1000
1
1 100k
RL = 100Ω
MAX4385E/MAX4386E
Low-Cost, 230MHz, Single/Quad Op Amps with
Rail-to-Rail Outputs and ±15kV ESD Protection
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(VCC= 5V, VEE= 0, VCM= 1.5V, A
VCL
= 1V/V, RL= 100Ω to VCC/2, TA = +25°C, unless otherwise noted.)
Pin Description
PIN
MAX4385E MAX4386E
SOT23 SO/TSSOP
NAME FUNCTION
1—OUT Amplifier Output
211V
EE
Negative Power Supply
3—IN+ Noninverting Input
4—IN- Inverting Input
54V
CC
Positive Power Supply. Connect a 2.2µF and 0.1µF capacitor to GND.
—1OUTA Amplifier A Output
—2INA- Amplifier A Inverting Input
—3INA+ Amplifier A Noninverting Input
—5INB+ Amplifier B Noninverting Input
—6INB- Amplifier B Inverting Input
—7OUTB Amplifier B Output
—8OUTC Amplifier C Output
—9INC- Amplifier C Inverting Input
—10INC+ Amplifier C Noninverting Input
—12IND+ Amplifier D Noninverting Input
—13IND- Amplifier D Inverting Input
—14OUTD Amplifier D Output
)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
INPUT OFFSET VOLTAGE (mV)
0.5
0
-0.5
-50 0-25 25 50 75 100
VCC = 5V
TEMPERATURE (°C)
INPUT BIAS CURRENT
vs. TEMPERATURE
-5.0
MAX4385E/86E toc27
INPUT BIAS CURRENT (µA)
-10.0
-5.5
-6.0
-6.5
-7.0
-7.5
-8.0
-8.5
-9.0
-9.5
VCC = 5V
MAX4385E/86E toc28
-50 0 25-25 50 75 100
TEMPERATURE (°C
SUPPLY CURRENT
vs. TEMPERATURE
8.0
7.5
7.0
6.5
6.0
5.5
SUPPLY CURRENT (mA)
5.0
4.5
4.0
VCC = 5V
-50 0-25 25 50 75 100
TEMPERATURE (°C)
MAX4385E/86E toc29
MAX4385E/MAX4386E
Low-Cost, 230MHz, Single/Quad Op Amps with
Rail-to-Rail Outputs and ±15kV ESD Protection
8 _______________________________________________________________________________________
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.
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 VEEand to within
2.25V of the positive supply rail.
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 resis-
tors 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).
Layout and Power-Supply Bypassing
These amplifiers operate from a single 5V power supply.
Bypass V
CC
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.
IN
R
G
V
OUT
= -(RF / RG) V
IN
R
F
V
OUT
MAX438_E
Figure 1b. Inverting Gain Configuration
IN
R
G
V
OUT
= [1+ (RF / RG)] V
IN
R
F
V
OUT
MAX438_E
Figure 1a. Noninverting Gain Configuration
MAX4385E/MAX4386E
Low-Cost, 230MHz, Single/Quad Op Amps with
Rail-to-Rail Outputs and ±15kV ESD Protection
_______________________________________________________________________________________ 9
Rail-to-Rail Outputs,
Ground-Sensing Inputs
The input common-mode range extends from (VEE200mV) 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 2kΩ load. The input ground sensing and
the rail-to-rail output substantially increase the dynamic
range. The input can swing 2.95V
P-P
and the output
can swing 4.9V
P-P
with minimal distortion.
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 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.
6
-4
100k 10M 100M1M 1G
-2
FREQUENCY (Hz)
GAIN (dB)
0
2
4
5
-3
-1
1
3
CL = 10pF
CL = 15pF
CL = 5pF
Figure 4. Small-Signal Gain vs. Frequency with Load
Capacitance and No Isolation Resistor
Figure 2. Driving a Capacitive Load Through an Isolation Resistor
9
11
10
13
12
15
14
16
0 200100 300 40050 250150 350 450 500
ISOLATION RESISTANCE
vs. CAPACITIVE LOAD
C
LOAD
(pF)
R
ISO
(Ω)
Figure 3. Isolation Resistance vs. Capacitive Load
R
G
R
F
R
ISO
C
L
V
OUT
V
IN
MAX438_E
Figure 5. Small-Signal Gain vs. Frequency with Load
Capacitance and 27
Ω Isolation Resistor
3
R
= 15Ω
ISO
2
1
0
-1
-2
GAIN (dB)
-3
-4
-5
-6
-7
100k 10M 100M1M 1G
CL = 68pF
CL = 120pF
FREQUENCY (Hz)
CL = 47pF
MAX4385E/MAX4386E
Low-Cost, 230MHz, Single/Quad Op Amps with
Rail-to-Rail Outputs and ±15kV ESD Protection
10 ______________________________________________________________________________________
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 speci-
fied 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.
HIGH-
VOLTAGE
DC
SOURCE
CHARGE CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
RD = 1.5kΩ
R
C
= 1MΩ
C
S
= 150pF
DEVICE
UNDER
TEST
Figure 7. Human Body ESD Model
IP 100%
90%
36.8%
t
RL
TIME
t
DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
10%
0
0
AMPERES
Figure 8. Human Body Current Waveform
220Ω
220Ω
75Ω
MAX438_E
5V
C
BYPASS
2.2µF
75Ω
TEST
POINT B
TEST
POINT A
V
EE
Figure 6. ESD Test Circuit
MAX4385E/MAX4386E
Low-Cost, 230MHz, Single/Quad Op Amps with
Rail-to-Rail Outputs and ±15kV ESD Protection
______________________________________________________________________________________ 11
Chip Information
MAX4385E TRANSISTOR COUNT: 124
MAX4386E TRANSISTOR COUNT: 264
tr = 0.7ns TO 1ns
30ns
60ns
t
100%
90%
10%
I
PEAK
I
Figure 10. IEC 1000-4-2 ESD Generator Current Waveform
CHARGE CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
C
S
150pF
R
C
50MΩ TO
100MΩ
R
D
330Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 9. IEC 1000-4-2 ESD Test Model
Pin Configurations (continued)
TOP VIEW
OUTA
INA-
INA+
V
INB+
INB-
1
2
3
4
CC
MAX4386E
5
6
7
TSSOP/SO
14
13
12
11
10
9
8
OUTD
IND-
IND+
V
EE
INC+
INC-
OUTCOUTB
MAX4385E/MAX4386E
Low-Cost, 230MHz, Single/Quad Op Amps with
Rail-to-Rail Outputs and ±15kV ESD Protection
12 ______________________________________________________________________________________
SOT-23 5L .EPS
E
1
1
21-0057
PACKAGEOUTLINE,SOT-23,5L
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.)
TSSOP4.40mm.EPS
PACKAGEOUTLINE,TSSOP4.40mmBODY
21-0066
1
1
G
Low-Cost, 230MHz, Single/Quad Op Amps with
Rail-to-Rail Outputs and ±15kV ESD Protection
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 408-737-7600 ____________________ 13
© 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
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.)
SOICN .EPS
PACKAGEOUTLINE,.150"SOIC
1
1
21-0041
B
REV.DOCUMENTCONTROLNO.APPROVAL
PROPRIETARYINFORMATION
TITLE:
TOPVIEW
FRONTVIEW
MAX
0.010
0.069
0.019
0.157
0.010
INCHES
0.150
0.007
E
C
DIM
0.014
0.004
B
A1
MIN
0.053A
0.19
3.80 4.00
0.25
MILLIMETERS
0.10
0.35
1.35
MIN
0.49
0.25
MAX
1.75
0.050
0.016L
0.40 1.27
0.3940.386D
D
MINDIM
D
INCHES
MAX
9.80 10.00
MILLIMETERS
MIN
MAX
16
AC
0.337 0.344 AB8.758.55 14
0.189 0.197 AA5.004.80 8
N MS012
N
SIDEVIEW
H 0.2440.228 5.80 6.20
e 0.050BSC 1.27BSC
C
HE
e
B
A1
A
D
0∞-8∞
L
1
VARIATIONS:
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