General Description
The MAX410/MAX412/MAX414 single/dual/quad op
amps set a new standard for noise performance in
high-speed, low-voltage systems. Input voltage-noise
density is guaranteed to be less than 2.4nV/√Hz at
1kHz. A unique design not only combines low noise
with ±5V operation, but also consumes 2.5mA supply
current per amplifier. Low-voltage operation is guaran-
teed with an output voltage swing of 7.3VP-P into 2kΩ
from ±5V supplies. The MAX410/MAX412/MAX414 also
operate from supply voltages between ±2.4V and ±5V
for greater supply flexibility.
Unity-gain stability, 28MHz bandwidth, and 4.5V/µs
slew rate ensure low-noise performance in a wide vari-
ety of wideband and measurement applications. The
MAX410/MAX412/MAX414 are available in DIP and SO
packages in the industry-standard single/dual/quad op
amp pin configurations. The single comes in an ultra-
small TDFN package (3mm 3mm).
Applications
Low-Noise Frequency Synthesizers
Infrared Detectors
High-Quality Audio Amplifiers
Ultra Low-Noise Instrumentation Amplifiers
Bridge Signal Conditioning
Features
oVoltage Noise: 2.4nV/√Hz (max) at 1kHz
o2.5mA Supply Current Per Amplifier
oLow Supply Voltage Operation: ±2.4V to ±5V
o28MHz Unity-Gain Bandwidth
o4.5V/µs Slew Rate
o250µV (max) Offset Voltage (MAX410/MAX412)
o115dB (min) Voltage Gain
oAvailable in an Ultra-Small TDFN Package
MAX410/MAX412/MAX414
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
________________________________________________________________
Maxim Integrated Products
1
OUT
N.C.V-
1
2
8
7
NULL
V+IN-
IN+
NULL
DIP/SO/TDFN
TOP VIEW
3
4
6
5
IN2-
IN2+V-
1
2
8
7
V+
OUT2IN1-
IN1+
OUT1
DIP/SO
3
4
6
5
MAX412
MAX410
Pin Configurations
+IN
-IN
42.2kΩ**
1% 2
3
200Ω
1%
1
200Ω
1%
1kΩ*
6
5
7OUT
42.2kΩ
1%
1/2 MAX412
1/2 MAX412
*TRIM FOR GAIN.
**TRIM FOR COMMON-MODE REJECTION.
LOW-NOISE INSTRUMENTATION AMPLIFIER
Typical Operating Circuit
19-4194; Rev 6; 9/09
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX410CPA 0°C to +70°C 8 Plastic DIP
MAX410BCPA 0°C to +70°C 8 Plastic DIP
MAX410CSA 0°C to +70°C 8 SO
MAX410BCSA 0°C to +70°C 8 SO
MAX410EPA -40°C to +85°C 8 Plastic DIP
MAX410BEPA -40°C to +85°C 8 Plastic DIP
MAX410ESA -40°C to +85°C 8 SO
MAX410BESA -40°C to +85°C 8 SO
MAX410ETA -40°C to +85°C 8 TDFN-EP*
MAX410MSA/PR -55°C to +125°C 8 SO**
MAX410MSA/PR-T -55°C to +125°C 8 SO**
*
EP = Exposed pad. Top Mark—AGQ.
**
Contact factory for availability.
Ordering Information continued at end of data sheet.
Pin Configurations continued at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
MAX410/MAX412/MAX414
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
Supply Voltage .......................................................................12V
Differential Input Current (Note 1) ....................................±20mA
Input Voltage Range........................................................V+ to V-
Common-Mode Input Voltage ..............(V+ + 0.3V) to (V- - 0.3V)
Short-Circuit Current Duration....................................Continuous
Continuous Power Dissipation (TA= +70°C)
MAX410/MAX412
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ...727mW
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
8-Pin TDFN (derate 18.5mW/°C above +70°C) .........1482mW
MAX414
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)800mW
14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW
Operating Temperature Ranges:
MAX41_C_ _ .......................................................0°C to +70°C
MAX41_E_ _.....................................................-40°C to +85°C
MAX41_M_ _..................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V+ = 5V, V- = -5V, TA= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX410, MAX410B, MAX412, MAX412B ±120 ±250
Input Offset Voltage VOS MAX414, MAX414B ±150 ±320 µV
Input Bias Current IB±80 ±150 nA
Input Offset Current IOS ±40 ±80 nA
Differential Input Resistance RIN(Diff) 20 kΩ
Common-Mode Input Resistance RIN
(
CM
)
40 MΩ
Input Capacitance CIN 4pF
10Hz 7
MAX410, MAX412,
MAX414 1000Hz (Note 2) 1.5 2.4
Input Noise-Voltage Density enMAX410B, MAX412B,
MAX414B 1000Hz (Note 2) 2.4 4.0
nV√Hz
fO = 10Hz 2.6
Input Noise-Current Density infO = 1000Hz 1.2 pA√Hz
Common-Mode Input Voltage VCM ±3.5 +3.7/
-3.8 V
Common-Mode Rejection Ratio CMRR VCM = ±3.5V 115 130 dB
Power-Supply Rejection Ratio PSRR VS = ±2.4V to ±5.25V 96 103 dB
RL = 2kΩ, VO = ±3.6V 115 122
Large-Signal Gain AVOL RL = 600Ω, VO = ±3.5V 110 120 dB
Output Voltage Swing VOUT RL = 2kΩ+3.6
-3.7
+3.7/
-3.8 V
Short-Circuit Output Current ISC 35 mA
Slew Rate SR 10kΩ || 20pF load 4.5 V/µs
Unity-Gain Bandwidth GBW 10kΩ || 20pF load 28 MHz
Settling Time tSTo 0.1% 1.3 µs
Channel Separation CSfO = 1kHz 135 dB
Note 1: The amplifier inputs are connected by internal back-to-back clamp diodes. In order to minimize noise in the input stage, current-
limiting resistors are not used. If differential input voltages exceeding ±1.0V are applied, limit input current to 20mA.
MAX410/MAX412/MAX414
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(V+ = 5V, V- = -5V, TA= 0°C to +70°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Offset Voltage VOS ±150 ±350 µV
Offset Voltage Tempco ∆VOS/∆T Over operating temperature range ±1 µV/°C
Input Bias Current IB±100 ±200 nA
Input Offset Current IOS ±80 ±150 nA
Common-Mode Input Voltage VCM ±3.5 +3.7/
-3.8 V
Common-Mode Rejection Ratio CMRR VCM = ±3.5V 105 121 dB
Power-Supply Rejection Ratio PSRR VS = ±2.4V to ±5.25V 90 97 dB
RL = 2kΩ, VO = ±3.6V 110 120
Large-Signal Gain AVOL RL = 600Ω, VO = ±3.5V 90 119 dB
Output Voltage Swing VOUT RL = 2kΩ±3.5 +3.7/
-3.6 V
Supply Current ISPer amplifier 3.3 mA
ELECTRICAL CHARACTERISTICS
(V+ = 5V, V- = -5V, TA= -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX410, MAX410B, MAX412, MAX412B ±200 ±400
Input Offset Voltage VOS MAX414, MAX414B ±200 ±450 µV
Offset Voltage Tempco ∆VOS/∆T Over operating temperature range ±1 µV/°C
Input Bias Current IB±130 ±350 nA
Input Offset Current IOS ±100 ±200 nA
Common-Mode Input Voltage VCM ±3.5 +3.7/
-3.6 V
Common-Mode Rejection Ratio CMRR VCM = ±3.5V 105 120 dB
Power-Supply Rejection Ratio PSRR VS = ±2.4V to ±5.25V 90 94 dB
RL = 2kΩ, VO = ±3.6V 110 118
Large-Signal Gain AVOL RL = 600Ω, VO = +3.4V to -3.5V 90 114 dB
Output Voltage Swing VOUT RL = 2kΩ±3.5 +3.7/
-3.6 V
Supply Current ISPer amplifier 3.3 mA
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, V- = -5V, TA= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Supply-Voltage Range VS±2.4 ±5.25 V
Supply Current ISPer amplifier 2.5 2.7 mA
MAX410/MAX412/MAX414
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (MAX410 only)
(V+ = 5V, V- = -5V, TA= -55°C to +125°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Offset Voltage VOS ±200 ±400 µV
Offset Voltage Tempco ∆VOS/∆T Over operating temperature range ±1 µV/°C
Input Bias Current IB±130 ±350 nA
Input Offset Current IOS ±100 ±200 nA
Common-Mode Input Voltage VCM ±3.5 +3.7/
-3.6 V
Common-Mode Rejection Ratio CMRR VCM = ±3.5V 105 120 dB
Power-Supply Rejection Ratio PSRR VS = ±2.4V to ±5.25V 90 94 dB
RL = 2kΩ, VO = ±3.5V 110 118
Large-Signal Gain AVOL RL = 600Ω, VO = +3.4V to -3.5V 90 114 dB
Output Voltage Swing VOUT RL = 2kΩ±3.5 +3.7/
-3.6 V
Supply Current ISPer amplifier 3.3 mA
Note 2: Guaranteed by design.
Note 3: All TDFN devices are 100% tested at TA= +25°C. Limits over temperature for thin TDFNs are guaranteed by design.
MAX410/MAX412/MAX414
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
_______________________________________________________________________________________
5
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
(V+ = 5V, V- = -5V, TA= +25°C, unless otherwise noted.)
110k10 100 1k
VOLTAGE-NOISE DENSITY
vs. FREQUENCY
MAX410-14 toc01
FREQUENCY (Hz)
1
10
100
VOLTAGE-NOISE DENSITY (nV/√Hz)
VS = ±5V
TA = +25°C
1/F CORNER = 90Hz
1 10k10 100 1k
CURRENT-NOISE DENSITY
vs. FREQUENCY
MAX410-14 toc02
FREQUENCY (Hz)
1
10
CURRENT-NOISE DENSITY (pA/√Hz)
VS = ±5V
TA = +25°C
1/F CORNER = 220Hz
0
10
5
20
15
30
25
35
45
40
50
1.3 1.4 1.51.2 1.6 1.7 1.8 1.9
1kHz VOLTAGE NOISE DISTRIBUTION
MAX410-14 toc03
UNITS (%)
INPUT-REFERRED VOLTAGE NOISE (nV/√Hz)
0.1Hz TO 10Hz VOLTAGE NOISE
MAX410-14 toc04
1s/div
100nV/div
(INPUT-REFERRED)
WIDEBAND NOISE DC TO 20kHz
MAX410-14 toc05
0.2ms/div
2µV/div
(INPUT-REFERRED)
0
40
20
80
60
120
100
140
-60 20-20 60 100 140
OPEN-LOOP GAIN
vs. TEMPERATURE
MAX410-14 toc06
TEMPERATURE (°C)
OPEN-LOOP GAIN (dB)
VS = ±5V
RL = 2kΩ
0
10
20
40
30
50
-60 20-20 60 100 140
SHORT-CIRCUIT OUTPUT CURRENT
vs. TEMPERATURE
MAX410-14 toc07
TEMPERATURE (°C)
SHORT-CIRCUIT OUTPUT CURRENT (mA)
VS = ±5V
SOURCE
SINK
0
10
9
8
7
6
5
4
3
2
1
-60 20-20 60 100 140
OUTPUT VOLTAGE SWING
vs. TEMPERATURE
MAX410-14 toc08
TEMPERATURE (°C)
OUTPUT VOLTAGE SWING (VP-P)
VS = ±5V
RL = 2kΩ
MAX410/MAX412/MAX414
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
6 _______________________________________________________________________________________
0
5
4
3
2
1
-60 20-20 60 100 140
SUPPLY CURRENT
vs. TEMPERATURE
MAX410-14 toc09
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
EACH AMPLIFIER
VS = ±5V
0
10
9
8
7
6
5
4
3
2
1
-60 20-20 60 100 140
SLEW RATE
vs. TEMPERATURE
MAX410-14 toc10
TEMPERATURE (°C)
SLEW RATE (V/µs)
VS = ±5V
RL = 10kΩ II 20pF
0
10
20
40
30
50
-60 20-20 60 100 140
UNITY-GAIN BANDWIDTH
vs. TEMPERATURE
MAX410-14 toc11
TEMPERATURE (°C)
UNITY-GAIN BANDWIDTH (MHz)
VS = ±5V
RL = 10kΩ II 20pF
LARGE-SIGNAL TRANSIENT RESPONSE
MAX410-14 toc12
1µs/div
AV = +1, RF = 499Ω, RL = 2kΩ II 20pF, VS = ±5V, TA = +25°C
INPUT
3V/div
OUTPUT
3V/div
GND
GND
SMALL-SIGNAL TRANSIENT RESPONSE
MAX410-14 toc13
200ns/div
INPUT
50mV/div
OUTPUT
50mV/div
AV = +1, RF = 499Ω, RL = 2kΩ II 20pF, VS = ±5V, TA = +25°C
GND
GND
10
0.01
100 1k 10k 100k 1M 10M
WIDEBAND VOLTAGE NOISE
(0.1Hz TO FREQUENCY INDICATED)
0.1
MAX410-14 toc14
BANDWIDTH (Hz)
RMS VOLTAGE NOISE (µV)
1
VS = ±5V
TA = +25°C
0.1
1
100
10
1k
10k
1 10010 1k 10k 100k 1M
TOTAL NOISE DENSITY
vs. MATCHED SOURCE RESISTANCE
MAX410-14 toc15
MATCHED SOURCE RESISTANCE (Ω)
TOTAL NOISE DENSITY (nV/√Hz)
VS = ±5V
TA = +25°C
@10Hz
@1kHz
RS NOISE ONLY
RS
RS
0.1
1
100
10
1k
10k
1 10010 1k 10k 100k 1M
TOTAL NOISE DENSITY
vs. UNMATCHED SOURCE RESISTANCE
MAX410-14 toc16
UNMATCHED SOURCE RESISTANCE (Ω)
TOTAL NOISE DENSITY (nV/√Hz)
VS = ±5V
TA = +25°C
@10Hz
@1kHz
R
S
NOISE ONLY
RS
Typical Operating Characteristics (continued)
(V+ = 5V, V- = -5V, TA= +25°C, unless otherwise noted.)
MAX410/MAX412/MAX414
Typical Operating Characteristics (continued)
(V+ = 5V, V- = -5V, TA= +25°C, unless otherwise noted.)
-85
-88
-91
-94
-97
-100
20 100 10k 50k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX410-14 toc17
FREQUENCY (Hz)
THD+N (dB)
1k
VS = ±5V
TA = +25°C
499Ω
VIN
7VP-P
0
50
45
40
35
30
25
20
15
10
5
1 10 100 1000 10,000
PERCENTAGE OVERSHOOT
vs. CAPACITIVE LOAD
MAX410-14 toc18
CAPACITANCE LOAD (pF)
OVERSHOOT (%)
VS = ±5V
TA = +25°C
AV = -1, RS = 2kΩ
AV = -10, RS = 200Ω
CL
RS
30pF
2kΩ
150
80
1 100 1000
MAX412/MAX414
CHANNEL SEPARATION vs. FREQUENCY
100
90
140
130
120
110
MAX410-14 toc19
FREQUENCY (kHz)
CHANNEL SEPARATION (dB)
10
VS = ±5V
TA = +25°C
500Ω
V01
CHANNEL SEPARATION = 20 logIN
500Ω
10Ω
V02
1kΩ
GAIN AND PHASE vs. FREQUENCY
FREQUENCY (kHz)
VOLTAGE GAIN (dB)
140
-20
120
100
80
60
40
20
0
90
-270
45
0
-45
-90
-135
-180
-225
0.001
0.0001 0.01
0.1
1
10
100
1,000
10,000
100,000
MAX410-14 toc20
GAIN
PHASE
PHASE (DEGREES)
40
30
20
10
0
-10
-20
-30
-40
-50
-60
0
-45
-90
-135
-180
-225
1 10 100
GAIN AND PHASE vs. FREQUENCY
FREQUENCY (MHz)
VOLTAGE GAIN (dB)
MAX410-14 toc21
GAIN
PHASE
PHASE (DEGREES)
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
_______________________________________________________________________________________
7
MAX410/MAX412/MAX414
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
8 _______________________________________________________________________________________
Applications Information
The MAX410/MAX412/MAX414 provide low voltage-
noise performance. Obtaining low voltage noise from a
bipolar op amp requires high collector currents in the
input stage, since voltage noise is inversely proportion-
al to the square root of the input stage collector current.
However, op amp current noise is proportional to the
square root of the input stage collector current, and the
input bias current is proportional to the input stage col-
lector current. Therefore, to obtain optimum low-noise
performance, DC accuracy, and AC stability, minimize
the value of the feedback and source resistance.
Total Noise Density vs. Source Resistance
The standard expression for the total input-referred
noise of an op amp at a given frequency is:
where:
Rn= Inverting input effective series resistance
Rp = Noninverting input effective series resistance
en= Input voltage-noise density at the frequency of
interest
in= Input current-noise density at the frequency of
interest
T = Ambient temperature in Kelvin (K)
k = 1.28 x 10-23 J/K (Boltzman’s constant)
In Figure 1, Rp= R3 and Rn= R1 || R2. In a real appli-
cation, the output resistance of the source driving the
input must be included with Rpand Rn. The following
example demonstrates how to calculate the total out-
put-noise density at a frequency of 1kHz for the
MAX412 circuit in Figure 1.
Gain = 1000
4kT at +25°C = 1.64 x 10-20
Rp= 100Ω
Rn= 100Ω|| 100kΩ= 99.9 W
en= 1.5nV/√Hz at 1kHz
in= 1.2pA/√Hz at 1kHz
et= [(1.5 x 10-9)2+ (100 + 99.9)2(1.2 x 10-12)2+ (1.64
x 10-20) (100 + 99.9)]1/2 = 2.36nV/√Hz at 1kHz
Output noise density = (100)et= 2.36µV/√Hz at 1kHz.
In general, the amplifier’s voltage noise dominates with
equivalent source resistances less than 200Ω. As the
equivalent source resistance increases, resistor noise
becomes the dominant term, eventually making the
voltage noise contribution from the MAX410/MAX412/
MAX414 negligible. As the source resistance is further
increased, current noise becomes dominant. For exam-
ple, when the equivalent source resistance is greater
than 3kΩat 1kHz, the current noise component is larg-
er than the resistor noise. The graph of Total Noise
Density vs. Matched Source Resistance in the
Typical
Operating Characteristics
shows this phenomenon.
Optimal MAX410/MAX412/MAX414 noise performance
and minimal total noise achieved with an equivalent
source resistance of less than 10kΩ.
Voltage Noise Testing
RMS voltage-noise density is measured with the circuit
shown in Figure 2, using the Quan Tech model 5173
noise analyzer, or equivalent. The voltage-noise density
at 1kHz is sample tested on production units. When
measuring op-amp voltage noise, only low-value, metal
film resistors are used in the test fixture.
The 0.1Hz to 10Hz peak-to-peak noise of the
MAX410/MAX412/MAX414 is measured using the test
ee i
tnpnn pn
222
+(R +R ) + 4kT (R +R )=
Figure 1. Total Noise vs. Source Resistance Example
R1
100Ω
R2
100kΩ
+5V
0.1µF
R3
100Ω
D.U.T
0.1µF
-5V
et
MAX410
MAX412
MAX414
Figure 2. Voltage-Noise Density Test Circuit
D.U.T en
MAX410
MAX412
MAX414
3Ω
27Ω
MAX410/MAX412/MAX414
circuit shown in Figure 3. Figure 4 shows the frequency
response of the circuit. The test time for the 0.1Hz to
10Hz noise measurement should be limited to 10 sec-
onds, which has the effect of adding a second zero to
the test circuit, providing increased attenuation for fre-
quencies below 0.1Hz.
Current Noise Testing
The current-noise density can be calculated, once the
value of the input-referred noise is determined, by
using the standard expression given below:
where:
Rn= Inverting input effective series resistance
Rp= Noninverting input effective series resistance
eno = Output voltage-noise density at the frequency of
interest (V/√Hz)
in= Input current-noise density at the frequency of
interest (A/√Hz)
AVCL = Closed-loop gain
T = Ambient temperature in Kelvin (K)
k = 1.38 x 10-23 J/K (Boltzman’s constant)
Rpand Rninclude the resistances of the input driving
source(s), if any.
If the Quan Tech model 5173 is used, then the AVCL
terms in the numerator and denominator of the equation
given above should be eliminated because the Quan
i
e
AHz
n
no VCL n p
n p VCL
22
-(A ) (4kT)(R +R )
(R +R )(A )
=
[]
/
Figure 3. 0.1Hz to 10Hz Voltage Noise Test Circuit
10ΩD.U.T
MAX410
0.1µF
100kΩ
+VS
-VS
2kΩ
4.7µF
+VS
-VS
100kΩ
0.1µF
24.9kΩ
2kΩ
4.7µF
22µFTO SCOPE x1
RIN = 1MΩ
110kΩ
MAX410
MAX412
MAX414
Figure 4. 0.1Hz to 10Hz Voltage Noise Test Circuit, Frequency
Response
FREQUENCY (Hz)
GAIN (dB)
1010.1
20
40
60
80
100
0
0.01 100
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
_______________________________________________________________________________________ 9
MAX410/MAX412/MAX414
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
10 ______________________________________________________________________________________
Tech measures input-referred noise. For the circuit in
Figure 5, assuming Rpis approximately equal to Rn
and the measurement is taken with the Quan Tech
model 5173, the equation simplifies to:
Input Protection
To protect amplifier inputs from excessive differential
input voltages, most modern op amps contain input
protection diodes and current-limiting resistors. These
resistors increase the amplifier’s input-referred noise.
They have not been included in the MAX410/MAX412/
MAX414, to optimize noise performance. The MAX410/
MAX412/MAX414 do contain back-to-back input pro-
tection diodes which will protect the amplifier for differ-
ential input voltages of ±0.1V. If the amplifier must be
protected from higher differential input voltages, add
external current-limiting resistors in series with the op
amp inputs to limit the potential input current to less
than 20mA.
Capacitive-Load Driving
Driving large capacitive loads increases the likelihood
of oscillation in amplifier circuits. This is especially true
for circuits with high loop gains, like voltage followers.
The output impedance of the amplifier and a capacitive
load form an RC network that adds a pole to the loop
response. If the pole frequency is low enough, as when
driving a large capacitive load, the circuit phase mar-
gin is degraded.
In voltage follower circuits, the MAX410/MAX412/
MAX414 remain stable while driving capacitive loads
as great as 3900pF (see Figures 6a and 6b).
When driving capacitive loads greater than 3900pF,
add an output isolation resistor to the voltage follower
circuit, as shown in Figure 7a. This resistor isolates the
load capacitance from the amplifier output and restores
the phase margin. Figure 7b is a photograph of the
response of a MAX410/MAX412/MAX414 driving a
0.015µF load with a 10Ωisolation resistor
The capacitive-load driving performance of the
MAX410/MAX412/MAX414 is plotted for closed-loop
gains of -1V/V and -10V/V in the % Overshoot vs.
Capacitive Load graph in the
Typical Operating
Characteristics
.
Feedback around the isolation resistor RI increases the
accuracy at the capacitively loaded output (see Figure 8).
The MAX410/MAX412/MAX414 are stable with a 0.01µF
load for the values of RIand CFshown. In general, for
decreased closed-loop gain, increase RIor CF. To drive
larger capacitive loads, increase the value of CF.
i
e
AHz
n
no2-20 3
3
-(1.64 10 )(20 10 )
(20 10 )
=
××
[]
×/
Figure 5. Current-Noise Test Circuit
100Ω
909Ω
+5V
0.022µF
Rp
10kΩ
D.U.T
-5V
eno
MAX410
MAX412
MAX414
Rn
10kΩ
0.022µF
Figure 6a. Voltage Follower Circuit with 3900pF Load
Rf
499Ω
D.U.T VOUT
MAX410
MAX412
MAX414
3900pF
VIN
Figure 6b. Driving 3900pF Load as Shown in Figure 6a
1µs/div
INPUT
1V/div
OUTPUT
1V/div GND
GND
VS = ±5V
TA = +25°C
MAX410/MAX412/MAX414
TDFN Exposed Paddle Connection
On TDFN packages, there is an exposed paddle that
does not carry any current but should be connected to
V- (not the GND plane) for rated power dissipation.
Total Supply Voltage Considerations
Although the MAX410/MAX412/MAX414 are specified
with ±5V power supplies, they are also capable of sin-
gle-supply operation with voltages as low as 4.8V. The
minimum input voltage range for normal amplifier oper-
ation is between V- + 1.5V and V+ - 1.5V. The minimum
room-temperature output voltage range (with 2kΩload)
is between V+ - 1.4V and V- + 1.3V for total supply volt-
ages between 4.8V and 10V. The output voltage range,
referenced to the supply voltages, decreases slightly
over temperature, as indicated in the ±5V
Electrical
Characteristics
tables. Operating characteristics at total
supply, voltages of less than 10V are guaranteed by
design and PSRR tests.
MAX410 Offset Voltage Null
The offset null circuit of Figure 9 provides approximately
±450µV of offset adjustment range, sufficient for zeroing
offset over the full operating temperature range.
Figure 7b. Driving a 0.015µF Load with a 10ΩIsolation Resistor
1µs/div
INPUT
1V/div
OUTPUT
1V/div
VS = ±5V
TA = +25°C
GND
GND
Figure 7a. Capacitive-Load Driving Circuit
499Ω
D.U.T VOUT
MAX410
MAX412
MAX414
CL > 0.015µF
VIN
RI
10Ω
Figure 8. Capacitive-Load Driving Circuit with Loop-Enclosed
Isolation Resistor
D.U.T VOUT
MAX410
MAX412
MAX414
CL
0.01µF
RI
10Ω
909Ω
1kΩ
VIN
CF
82pF
10kΩ
Figure 9. MAX410 Offset Null Circuit
7
8
10kΩ
1NULL
NULL
V+
MAX410
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
______________________________________________________________________________________ 11
MAX410/MAX412/MAX414
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
12 ______________________________________________________________________________________
Ordering Information (continued)
PART TEMP RANGE PIN-PACKAGE
MAX412CPA 0°C to +70°C 8 Plastic DIP
MAX412BCPA 0°C to +70°C 8 Plastic DIP
MAX412CSA 0°C to +70°C 8 SO
MAX412BCSA 0°C to +70°C 8 SO
MAX412EPA -40°C to +85°C 8 Plastic DIP
MAX412BEPA -40°C to +85°C 8 Plastic DIP
MAX412ESA -40°C to +85°C 8 SO
MAX412BESA -40°C to +85°C 8 SO
MAX414CPD 0°C to +70°C 14 Plastic DIP
MAX414BCPD 0°C to +70°C 14 Plastic DIP
MAX414CSD 0°C to +70°C 14 SO
MAX414BCSD 0°C to +70°C 14 SO
MAX414EPD -40°C to +85°C 14 Plastic DIP
MAX414BEPD -40°C to +85°C 14 Plastic DIP
MAX414ESD -40°C to +85°C 14 SO
MAX414BESD -40°C to +85°C 14 SO
14
13
12
11
10
9
8
1
2
3
4
5
6
7
OUT4
IN4-
IN4+
V-V+
IN1+
IN1-
OUT1
TOP VIEW
MAX414
IN3+
IN3-
OUT3OUT2
IN2-
IN2+
DIP/SO
3
2
14
Pin Configurations (continued)
Chip Information
MAX410 TRANSISTOR COUNT: 132
MAX412 TRANSISTOR COUNT: 262
MAX414 TRANSISTOR COUNT: 2 262 (hybrid)
PROCESS: Bipolar
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
8 Plastic DIP P8-1 21-0043
8 SO (MAX410) S8-2 21-0041
8 SO (MAX412) S8-4 21-0041
8 TDFN-EP T833-2 21-0137
14 Plastic DIP P14-3 21-0043
14 SO S14-1 21-0041
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
MAX410/MAX412/MAX414
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
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
© 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
5 10/08 Added rugged plastic product. 1, 11
6 9/09 Added military temperature operating range and new Electrical
Characteristics table for the MAX410. Updated Package Information table. 1, 2, 4, 12–13
