MAX410 14 DS Max 410 MAX414

User Manual: Max 410

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19-4194; Rev 6; 9/09

Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
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 guaranteed 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 variety 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 ultrasmall TDFN package (3mm  3mm).

Applications

Features
o Voltage Noise: 2.4nV/√Hz (max) at 1kHz
o 2.5mA Supply Current Per Amplifier
o Low Supply Voltage Operation: ±2.4V to ±5V
o 28MHz Unity-Gain Bandwidth
o 4.5V/µs Slew Rate
o 250µV (max) Offset Voltage (MAX410/MAX412)
o 115dB (min) Voltage Gain
o Available in an Ultra-Small TDFN Package

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

Low-Noise Frequency Synthesizers

MAX410BEPA

-40°C to +85°C

8 Plastic DIP

Infrared Detectors

MAX410ESA

-40°C to +85°C

8 SO

High-Quality Audio Amplifiers

MAX410BESA

-40°C to +85°C

8 SO

MAX410ETA

-40°C to +85°C

8 TDFN-EP*

Ultra Low-Noise Instrumentation Amplifiers
Bridge Signal Conditioning

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.

Typical Operating Circuit

Ordering Information continued at end of data sheet.

Pin Configurations
1kΩ*

42.2kΩ**
1%

TOP VIEW

200Ω
1%
2
1

-IN

42.2kΩ
1%

3

200Ω
1%

6

1/2 MAX412

7
5

1/2 MAX412

+IN

OUT

NULL

1

IN-

2

7

V+

IN+

3

6

OUT

V- 4

5

N.C.

8

NULL

8

V+

DIP/SO/TDFN

*TRIM FOR GAIN.
**TRIM FOR COMMON-MODE REJECTION.
LOW-NOISE INSTRUMENTATION AMPLIFIER

MAX410

OUT1

1

IN1-

2

7

OUT2

IN1+

3

6

IN2-

V- 4

5

IN2+

MAX412

DIP/SO

Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products

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.

1

MAX410/MAX412/MAX414

General Description

MAX410/MAX412/MAX414

Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
ABSOLUTE MAXIMUM RATINGS
Supply Voltage .......................................................................12V
Differential Input Current (Note 1) ....................................±20mA
Input Voltage Range........................................................V+ to VCommon-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

Note 1: The amplifier inputs are connected by internal back-to-back clamp diodes. In order to minimize noise in the input stage, currentlimiting resistors are not used. If differential input voltages exceeding ±1.0V are applied, limit input current to 20mA.
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.

ELECTRICAL CHARACTERISTICS
(V+ = 5V, V- = -5V, TA = +25°C, unless otherwise noted.)
PARAMETER
Input Offset Voltage
Input Bias Current

SYMBOL
VOS

TYP

MAX

MAX410, MAX410B, MAX412, MAX412B

CONDITIONS

MIN

±120

±250

MAX414, MAX414B

±150

±320

UNITS
µV

IB

±80

±150

nA

IOS

±40

±80

nA

Differential Input Resistance

RIN(Diff)

20

kΩ

Common-Mode Input Resistance

RIN(CM)

40

MΩ

CIN

4

pF

Input Offset Current

Input Capacitance

MAX410, MAX412,
MAX414
Input Noise-Voltage Density

Input Noise-Current Density
Common-Mode Input Voltage

en

in

MAX410B, MAX412B,
MAX414B

10Hz

7

1000Hz (Note 2)

1.5

2.4

1000Hz (Note 2)

2.4

4.0

fO = 10Hz

2.6

fO = 1000Hz

1.2

VCM

nV√Hz

pA√Hz

±3.5

+3.7/
-3.8

V

115

130

dB
dB

Common-Mode Rejection Ratio

CMRR

VCM = ±3.5V

Power-Supply Rejection Ratio

PSRR

VS = ±2.4V to ±5.25V

96

103

RL = 2kΩ, VO = ±3.6V

115

122

RL = 600Ω, VO = ±3.5V

110

120

RL = 2kΩ

+3.6
-3.7

+3.7/
-3.8

V

35

mA

Large-Signal Gain

AVOL

Output Voltage Swing

VOUT

Short-Circuit Output Current
Slew Rate
Unity-Gain Bandwidth

ISC

dB

SR

10kΩ || 20pF load

4.5

V/µs

GBW

10kΩ || 20pF load

28

MHz

Settling Time

tS

To 0.1%

1.3

µs

Channel Separation

CS

fO = 1kHz

135

dB

2

_______________________________________________________________________________________

Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
MAX410/MAX412/MAX414

ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, V- = -5V, TA = +25°C, unless otherwise noted.)
PARAMETER

SYMBOL

Operating Supply-Voltage Range

VS

Supply Current

IS

CONDITIONS

MIN

TYP

±2.4
Per amplifier

MAX

UNITS

±5.25

V

2.7

mA

TYP

MAX

UNITS

±150

±350

µV

2.5

ELECTRICAL CHARACTERISTICS
(V+ = 5V, V- = -5V, TA = 0°C to +70°C, unless otherwise noted.)
PARAMETER
Input Offset Voltage

SYMBOL

CONDITIONS

MIN

VOS

Offset Voltage Tempco
Input Bias Current

∆VOS/∆T

Over operating temperature range

±1

µV/°C

IB

±100

±200

nA

Input Offset Current

IOS

±80

±150

nA

Common-Mode Input Voltage

VCM

±3.5

+3.7/
-3.8

V

105

121

dB
dB

Common-Mode Rejection Ratio

CMRR

VCM = ±3.5V

Power-Supply Rejection Ratio

PSRR

VS = ±2.4V to ±5.25V

90

97

RL = 2kΩ, VO = ±3.6V

110

120

RL = 600Ω, VO = ±3.5V

90

119

±3.5

+3.7/
-3.6

Large-Signal Gain

AVOL

Output Voltage Swing

VOUT

Supply Current

IS

RL = 2kΩ
Per amplifier

dB
V
3.3

mA

MAX

UNITS

ELECTRICAL CHARACTERISTICS
(V+ = 5V, V- = -5V, TA = -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETER
Input Offset Voltage

SYMBOL
VOS

Offset Voltage Tempco
Input Bias Current

∆VOS/∆T

CONDITIONS

MIN

TYP

MAX410, MAX410B, MAX412, MAX412B

±200

±400

MAX414, MAX414B

±200

±450

Over operating temperature range

±1

µV
µV/°C

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

Large-Signal Gain

AVOL

RL = 2kΩ, VO = ±3.6V

110

118

RL = 600Ω, VO = +3.4V to -3.5V

90

114

Output Voltage Swing

VOUT

±3.5

+3.7/
-3.6

Supply Current

IS

RL = 2kΩ
Per amplifier

dB
V
3.3

mA

_______________________________________________________________________________________

3

MAX410/MAX412/MAX414

Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
ELECTRICAL CHARACTERISTICS (MAX410 only)
(V+ = 5V, V- = -5V, TA = -55°C to +125°C, unless otherwise noted.)
PARAMETER
Input Offset Voltage
Offset Voltage Tempco
Input Bias Current
Input Offset Current
Common-Mode Input Voltage

SYMBOL

CONDITIONS

MIN

VOS
∆VOS/∆T

Over operating temperature range

TYP

MAX

±200

±400

±1

UNITS
µV
µV/°C

IB

±130

±350

nA

IOS

±100

±200

nA

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

Large-Signal Gain

AVOL

RL = 2kΩ, VO = ±3.5V

110

118

RL = 600Ω, VO = +3.4V to -3.5V

90

114

Output Voltage Swing

VOUT

±3.5

+3.7/
-3.6

Supply Current

IS

RL = 2kΩ
Per amplifier

dB
V
3.3

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.

4

_______________________________________________________________________________________

mA

Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps

VS = ±5V
TA = +25°C

CURRENT-NOISE DENSITY (pA/√Hz)

10

45
40
35
UNITS (%)

VS = ±5V
TA = +25°C

1kHz VOLTAGE NOISE DISTRIBUTION
50

100

1k

20

5

1/F CORNER = 220Hz
10k

0
1

10

FREQUENCY (Hz)

100

1k

1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9
INPUT-REFERRED VOLTAGE NOISE (nV/√Hz)

10k

FREQUENCY (Hz)

0.1Hz TO 10Hz VOLTAGE NOISE

WIDEBAND NOISE DC TO 20kHz

MAX410-14 toc04

MAX410-14 toc05

100nV/div
(INPUT-REFERRED)

2µV/div
(INPUT-REFERRED)

1s/div

0.2ms/div

80
60
40
20
0

SOURCE
40

30

MAX410-14 toc07

VS = ±5V

SINK

20

10

-20

20

60

TEMPERATURE (°C)

100

140

VS = ±5V
RL = 2kΩ

9
8
7
6
5
4
3
2
1
0

0
-60

10

OUTPUT VOLTAGE SWING (VP-P)

OPEN-LOOP GAIN (dB)

VS = ±5V
RL = 2kΩ

100

50
SHORT-CIRCUIT OUTPUT CURRENT (mA)

140
120

OUTPUT VOLTAGE SWING
vs. TEMPERATURE

SHORT-CIRCUIT OUTPUT CURRENT
vs. TEMPERATURE
MAX410-14 toc06

OPEN-LOOP GAIN
vs. TEMPERATURE

MAX410-14 toc08

10

25

10

1
1

30

15

1/F CORNER = 90Hz
1

MAX410-14 toc03

10

MAX410-14 toc01

VOLTAGE-NOISE DENSITY (nV/√Hz)

100

CURRENT-NOISE DENSITY
vs. FREQUENCY
MAX410-14 toc02

VOLTAGE-NOISE DENSITY
vs. FREQUENCY

-60

-20

20

60

TEMPERATURE (°C)

100

140

-60

-20

20

60

100

140

TEMPERATURE (°C)

_______________________________________________________________________________________

5

MAX410/MAX412/MAX414

Typical Operating Characteristics
(TA == +25°C,
(V+
5V, V- =unless
-5V, Totherwise
noted.)
unless otherwise noted.)
A = +25°C,

Typical Operating Characteristics (continued)
(V+ = 5V, V- = -5V, TA = +25°C, unless otherwise noted.)

SLEW RATE (V/µs)

8

3

2

1

7
6
5
4
3
2

50

MAX410-14 toc11

VS = ±5V
RL = 10kΩ II 20pF

9

UNITY-GAIN BANDWIDTH (MHz)

EACH AMPLIFIER
VS = ±5V

4
SUPPLY CURRENT (mA)

10

MAX410-14 toc09

5

UNITY-GAIN BANDWIDTH
vs. TEMPERATURE

SLEW RATE
vs. TEMPERATURE
MAX410-14 toc10

SUPPLY CURRENT
vs. TEMPERATURE

VS = ±5V
RL = 10kΩ II 20pF

40

30

20

10

1
0

0

0
-20

20

60

100

-60

140

-20

TEMPERATURE (°C)

20

60

100

-60

140

-20

LARGE-SIGNAL TRANSIENT RESPONSE

INPUT
3V/div

GND

INPUT
50mV/div

GND

OUTPUT
3V/div

GND

OUTPUT
50mV/div

GND

1µs/div

WIDEBAND VOLTAGE NOISE
(0.1Hz TO FREQUENCY INDICATED)

VS = ±5V
TA = +25°C

MAX410-14 toc15

RS

RS

1k

100
@10Hz

10

NLY

EO

@1kHz

RS

IS
NO

1

10k

100k

BANDWIDTH (Hz)

1M

10M

10k

RS

1k

100
@10Hz

10

@1kHz

R

LY
ON
ISE
O
N
S

1

VS = ±5V
TA = +25°C

VS = ±5V
TA = +25°C

0.1

0.1

0.01

6

TOTAL NOISE DENSITY
vs. UNMATCHED SOURCE RESISTANCE

TOTAL NOISE DENSITY (nV/√Hz)

0.1

TOTAL NOISE DENSITY (nV/√Hz)

MAX410-14 toc14

1

10k

1

140

200ns/div
AV = +1, RF = 499Ω, RL = 2kΩ II 20pF, VS = ±5V, TA = +25°C

TOTAL NOISE DENSITY
vs. MATCHED SOURCE RESISTANCE

10

100

MAX410-14 toc13

AV = +1, RF = 499Ω, RL = 2kΩ II 20pF, VS = ±5V, TA = +25°C

1k

60

SMALL-SIGNAL TRANSIENT RESPONSE

MAX410-14 toc12

100

20

TEMPERATURE (°C)

TEMPERATURE (°C)

MAX410-14 toc16

-60

RMS VOLTAGE NOISE (µV)

MAX410/MAX412/MAX414

Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps

10

100

1k

10k

100k

MATCHED SOURCE RESISTANCE (Ω)

1M

1

10

100

1k

10k

100k

UNMATCHED SOURCE RESISTANCE (Ω)

_______________________________________________________________________________________

1M

Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps

RS

2kΩ

35

-91

-94

CL

30
25
20
AV = -1, RS = 2kΩ

15
10

-97

150

VS = ±5V
TA = +25°C

140

MAX410-14 toc19

40
OVERSHOOT (%)

THD+N (dB)

VIN
7VP-P

VS = ±5V
TA = +25°C

30pF

45

CHANNEL SEPARATION (dB)

-88

50

MAX410-14 toc18

VS = ±5V
TA = +25°C

499Ω

MAX410-14 toc17

-85

MAX412/MAX414
CHANNEL SEPARATION vs. FREQUENCY

PERCENTAGE OVERSHOOT
vs. CAPACITIVE LOAD

TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY

130
120

500Ω
500Ω
V01

110
1kΩ

100

10Ω
V02

90

AV = -10, RS = 200Ω

5

CHANNEL SEPARATION = 20 logIN

80

0
20

100

10k

1k

50k

1

10

FREQUENCY (Hz)

100

1000

10,000

MAX410-14 toc20

120

GAIN

40

45

30

-45
PHASE

-90
-135

0

-45

GAIN

10
0

-90

-10
-20

-135
PHASE

-30

20

-180

0

-225

-50

-270
0.001
0.1
10
1,000
100,000
0.0001
0.01
1
100
10,000
FREQUENCY (kHz)

-60

-20

MAX410-14 toc21

20
VOLTAGE GAIN (dB)

60

40

0

80

1000

GAIN AND PHASE vs. FREQUENCY
90

PHASE (DEGREES)

VOLTAGE GAIN (dB)

100

100

FREQUENCY (kHz)

GAIN AND PHASE vs. FREQUENCY
140

10

1

CAPACITANCE LOAD (pF)

-40

PHASE (DEGREES)

-100

-180

-225
1

10

100

FREQUENCY (MHz)

_______________________________________________________________________________________

7

MAX410/MAX412/MAX414

Typical Operating Characteristics (continued)
(V+ = 5V, V- = -5V, TA = +25°C, unless otherwise noted.)

MAX410/MAX412/MAX414

Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
Applications Information
The MAX410/MAX412/MAX414 provide low voltagenoise performance. Obtaining low voltage noise from a
bipolar op amp requires high collector currents in the
input stage, since voltage noise is inversely proportional 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 collector 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:
e t = en2 +(Rp +Rn )2 in2 + 4kT (Rp +Rn )
where:
Rn = Inverting input effective series resistance
Rp = Noninverting input effective series resistance

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 example, when the equivalent source resistance is greater
than 3kΩ at 1kHz, the current noise component is larger 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

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 application, the output resistance of the source driving the
input must be included with Rp and Rn. The following
example demonstrates how to calculate the total output-noise density at a frequency of 1kHz for the
MAX412 circuit in Figure 1.
Gain = 1000

R2
100kΩ
+5V

0.1µF

R1
100Ω

et

D.U.T

R3
100Ω

0.1µF
-5V

MAX410
MAX412
MAX414

Figure 1. Total Noise vs. Source Resistance Example

10-20

4kT at +25°C = 1.64 x
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

27Ω

3Ω

en

D.U.T

MAX410
MAX412
MAX414

Figure 2. Voltage-Noise Density Test Circuit
8

_______________________________________________________________________________________

Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
100kΩ

+VS
2kΩ
10Ω

+VS

D.U.T

22µF

2kΩ

TO SCOPE x1
RIN = 1MΩ

MAX410

4.7µF

-VS

-VS

110kΩ
4.7µF

100kΩ

MAX410
MAX412
MAX414
0.1µF
24.9kΩ

Figure 3. 0.1Hz to 10Hz Voltage Noise Test Circuit

Current Noise Testing
100

The current-noise density can be calculated, once the
value of the input-referred noise is determined, by
using the standard expression given below:

GAIN (dB)

80

60

in =

[

] A/

eno 2 - (A VCL )2 (4kT)(Rn +Rp )
(Rn +Rp )(A VCL )

Hz

40

where:
Rn = Inverting input effective series resistance
Rp= Noninverting input effective series resistance

20

0
0.01

0.1

1

10

100

FREQUENCY (Hz)

Figure 4. 0.1Hz to 10Hz Voltage Noise Test Circuit, Frequency
Response

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 seconds, which has the effect of adding a second zero to
the test circuit, providing increased attenuation for frequencies below 0.1Hz.

eno = Output voltage-noise density at the frequency of
interest (V/√Hz)
i n = 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)
Rp and Rn include 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

_______________________________________________________________________________________

9

MAX410/MAX412/MAX414

0.1µF

MAX410/MAX412/MAX414

Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
909Ω

Rf
499Ω

+5V
0.022µF

Rn
10kΩ
100Ω

D.U.T

MAX410
MAX412
MAX414

eno

D.U.T
Rp
10kΩ

MAX410
MAX412
MAX414

0.022µF
-5V

Figure 6a. Voltage Follower Circuit with 3900pF Load

Figure 5. Current-Noise Test Circuit

Tech measures input-referred noise. For the circuit in
Figure 5, assuming Rp is approximately equal to Rn
and the measurement is taken with the Quan Tech
model 5173, the equation simplifies to:

in =

[

] A/

VS = ±5V
TA = +25°C
INPUT
1V/div

GND

OUTPUT
1V/div

GND

eno 2 - (1.64 × 10-20 )(20 × 103 )
(20 × 103 )

Hz

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 protection diodes which will protect the amplifier for differential 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 margin 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).

10

VOUT
3900pF

VIN

1µs/div

Figure 6b. Driving 3900pF Load as Shown in Figure 6a

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 10Ω isolation 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 RI and CF shown. In general, for
decreased closed-loop gain, increase RI or CF. To drive
larger capacitive loads, increase the value of CF.

______________________________________________________________________________________

Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps

MAX410
MAX412
MAX414

CF
82pF
VIN

1kΩ

RI
10Ω

RI
10Ω

D.U.T

D.U.T

VOUT
CL
0.01µF

VOUT

VIN

CL > 0.015µF

MAX410
MAX412
MAX414

909Ω

Figure 8. Capacitive-Load Driving Circuit with Loop-Enclosed
Isolation Resistor

Figure 7a. Capacitive-Load Driving Circuit

VS = ±5V
TA = +25°C
INPUT
1V/div

10kΩ

GND

1

OUTPUT
1V/div

GND

NULL 8

NULL

MAX410
V+

7

1µs/div

Figure 7b. Driving a 0.015µF Load with a 10Ω Isolation Resistor

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 single-supply operation with voltages as low as 4.8V. The
minimum input voltage range for normal amplifier operation is between V- + 1.5V and V+ - 1.5V. The minimum
room-temperature output voltage range (with 2kΩ load)

Figure 9. MAX410 Offset Null Circuit

is between V+ - 1.4V and V- + 1.3V for total supply voltages 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.

______________________________________________________________________________________

11

MAX410/MAX412/MAX414

10kΩ

499Ω

MAX410/MAX412/MAX414

Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
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
-40°C to +85°C

8 Plastic DIP

MAX412ESA

-40°C to +85°C

8 SO

14 OUT4

OUT1 1
IN1-

13 IN4-

2
4

1
IN1+

V+ 4

-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

-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

11 V-

MAX414
2

3

10 IN3+

IN2- 6

9

IN3-

OUT2 7

8

OUT3

DIP/SO

14 SO

MAX414EPD

12 IN4+

3

IN2+ 5

MAX412BESA

0°C to +70°C

TOP VIEW

8 Plastic DIP

MAX412BEPA

MAX414BCSD

Pin Configurations (continued)

Chip Information
MAX410 TRANSISTOR COUNT: 132
MAX412 TRANSISTOR COUNT: 262
MAX414 TRANSISTOR COUNT: 2  262 (hybrid)
PROCESS: Bipolar

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.
PACKAGE TYPE

12

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

______________________________________________________________________________________

Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
REVISION
NUMBER

REVISION
DATE

5

10/08

Added rugged plastic product.

9/09

Added military temperature operating range and new Electrical
Characteristics table for the MAX410. Updated Package Information table.

6

DESCRIPTION

PAGES
CHANGED
1, 11
1, 2, 4, 12–13

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.

MAX410/MAX412/MAX414

Revision History

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Format                          : application/pdf
Creator                         : Marichu  Quijano
Title                           : MAX410-14 DS
Author                          : Marichu  Quijano

EXIF Metadata provided by EXIF.tools

MAX410 14 DS Max 410 MAX414

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