Not Recommended for New Designs
This product was manufactured for Maxim by an outside wafer foundry
using a process that is no longer available. It is not recommended for
new designs. The data sheet remains available for existing users.
A Maxim replacement or an industry second-source may be available.
Please see the QuickView data sheet for this part or contact technical
support for assistance.
For further information,
contact Maxim’s Applications Tech Support.
19-2772; Rev 4; 4/07
High-Precision, Low-Voltage,
Micropower Op Amp
General Description
The MAX480 is a precision micropower operational ampli-
fier with flexible power-supply capability. Its guaranteed
140µV maximum offset voltage (25µV typ) is the lowest of
any micropower op amp. Similarly, input bias current,
input offset current, and drift specifications are within tight
limits.
Both the input and output voltage ranges include the neg-
ative supply rail, allowing maximum signal range capabili-
ty in single-supply applications. The MAX480 operates
with either a single supply ranging from +1.6V to +36V or
dual supplies from ±0.8V to ±18V. The MAX480 con-
sumes less than 20µA, allowing operation in excess of
10,000 hours from a 250mA-hr lithium coin cell. Even with
a minimal quiescent current, the amplifier sinks or sources
5mA from its output.
The MAX480 is available in 8-pin DIP and SO packages in
commercial, extended, and military temperature ranges.
PART
Features
♦
Single- or Dual-Supply Operation: +1.6V to +36V,
±0.8V to ±18V
♦
True Single-Supply Operation: Input and Output
Voltage Ranges Include Ground
♦
2.0μV/°C Max Offset Voltage Drift
♦
20μA Max Supply Current
♦
5mA Min Output Drive
♦
140μV Max Input Offset Voltage
♦
3nA Max Input Bias Current
♦
500V/mV Min Open-Loop Gain
♦
Standard 741 Pinout with Nulling to V-
MAX480
Ordering Information
TEMP RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 CERDIP
MAX480CPA
MAX480CSA
MAX480EPA
MAX480ESA
MAX480MJA
Applications
Precision Micropower Amplifiers
Micropower Signal Processing
Battery-Powered Analog Circuits
Typical Operating Circuit
V+ (5V)
Pin Configuration
TOP VIEW
R2
10k
R1
10k
V
IN
HP5082-2800
2
7
IN914
6
NULL
OUT
IN-
IN+
1
2
8
7
N.C.
V+
OUT
NULL
3
MAX480
4
R3
100k
MAX480
3
6
5
V- 4
DIP/SO
SINGLE OP AMP FULL-WAVE RECTIFIER
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
High-Precision, Low-Voltage,
Micropower Op Amp
MAX480
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V+ to V-) ....................................................±18V
Differential Input Voltage ........................(V- - 20V) to (V+ + 20V)
Common-Mode Input Voltage ................(V- - 20V) to (V+ + 20V)
Output Short-Circuit Duration ........................................Indefinite
Continuous Power Dissipation
Plastic DIP (derate 9.09mW/°C above +70°C) .............727mW
SO (derate 5.88mW/°C above +70°C) ..............................471mW
CERDIP (derate 8.0mW/°C above +70°C) ....................640mW
Operating Temperature Ranges
MAX480C_A.........................................................0°C to +70°C
MAX480E_A ......................................................-40°C to +85°C
MAX480MJA ...................................................-55°C to +125°C
Junction Temperature (T
J
).................................-65°C to +150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+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 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
S
= ±1.5V to ±15V, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Input Offset Voltage
Input Offset Current
Input Bias Current
SYMBOL
V
OS
I
OS
I
B
V
CM
= 0
V
CM
= 0
V
S
= ±15V,
V
O
= ±10V
V+ = 5V, V- = 0,
1V < V
O
< 4V
Input Voltage
IVR
V
O
Output Voltage Swing
V
OH
V
OL
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Slew Rate
Supply Current
Capacitive Load Stability
Input Noise Voltage
Differential-Mode Input Resistance
Common-Mode Input Resistance
e
np-p
R
IN
R
INCM
CMRR
PSRR
SR
I
SY
V
S
= ±15V
V
S
= ±1.5V
V
S
= ±15V
A
V
= +1V/V, no oscillations (Note 2)
f
O
= 0.1Hz to 10Hz, V
S
= ±15V
V
S
= ±15V
V
S
= ±15V
250
5
V+ = 5V, V- = 0
V
S
= ±15V
(Note 1)
V
S
= ±15V
R
L
= 10kΩ
R
L
= 2kΩ
R
L
= 100kΩ
R
L
= 10kΩ
R
L
= 2kΩ
R
L
= 100kΩ
R
L
= 10kΩ
500
200
75
100
50
0/4
-15/13.5
±14
±10
4.0
85
90
±14.2
±12
4.2
100
110
130
1.0
12
9
14
650
3
30
20
15
20
12
500
µV
dB
µV/V
V/ms
µA
pF
µVp-p
MΩ
GΩ
V
CONDITIONS
MIN
TYP
25
0.2
1
1200
600
250
400
180
V
V/mV
MAX
140
4
3
10
UNITS
µV
nA
nA
Large-Signal Voltage Gain
A
VO
V+ = 5V, V- = 0, R
L
= 2kΩ
V+ = 5V, V- = 0, R
L
= 10kΩ
V+ = 5V, V- = 0, 0 < V
CM
< 4V
V
S
= ±15V, -15V < V
CM
< 13.5V
2
_______________________________________________________________________________________
High-Precision, Low-Voltage,
Micropower Op Amp
ELECTRICAL CHARACTERISTICS
(V
S
= ±1.5V to ±15V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER SYMBOL
Input Offset
Voltage
Input Offset
Voltage Drift
Input Offset
Current
Input Bias
Current
V
OS
TCV
OS
I
OS
I
B
(Note 2)
V
CM
= 0
V
CM
= 0
V
S
= ±15V,
V = ±10V
A
VO
V+ = 5V,
V- = 0,
1V < V
O
< 4V
IVR
V
O
Output Voltage
Swing
V
OH
V
OL
V+ = 5V, V- = 0
V
S
= ±15V (Note 1)
V
S
= ±15V
V+ = 5V, V- = 0
R
L
= 2kΩ
V+ = 5V, V- = 0
R
L
= 10kΩ
V+ = 5V, V- = 0,
0 < V
CM
< 3.5V
V
S
= ±15V,
-15V < V
CM
< 13.5V
PSRR
I
SY
V
S
= ±1.5V
V
S
= ±15V
85
90
R
L
= 10kΩ
R
L
= 2kΩ
R
L
= 100kΩ
R
L
= 10kΩ
R
L
= 2kΩ
R
L
= 100kΩ
R
L
= 10kΩ
350
130
55
50
30
0/3.5
-15/13.5
±13.5 ±14
±9.5
±11.8
3.9
4.1
100
110
120
1.0
12
16
12
25
30
500
85
90
CONDITIONS
MAX480C
MIN TYP MAX
40
0.3
0.2
1
950
400
125
360
150
220
2.0
MAX480E
MIN TYP MAX
50
0.3
0.3
2
350
130
55
50
30
0/3.5
-15/13.5
±13.5 ±14
±10.5 ±11.8
9.5
3.9
4.1
100
110
120
1.0
13
17
12
25
30
500
80
85
800
400
150
280
140
250
2.0
MAX480M
MIN TYP MAX
70
0.3
0.5
3
60
45
30
35
22
0/3.5
-15/13.5
±13.5 ±13.7
±10.5 ±11.5
3.9
4.1
100
105
dB
115
3.2
15
19
15
25
30
µV/V
µA
500
µV
V
400
240
110
200
110
V
V/mV
300
2.0
2.0
10.0
7
30
UNITS
µV
µV/°C
nA
nA
MAX480
5.0
2.0
15
3
7.0
2.0
5
20
Large-Signal
Voltage Gain
Input Voltage
Range
Common-Mode
Rejection Ratio
CMRR
Power-Supply
Rejection Ratio
Supply Current
Note 1:
Guaranteed by CMRR test.
Note 2:
Guaranteed by design.
_______________________________________________________________________________________
3
High-Precision, Low-Voltage,
Micropower Op Amp
MAX480
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX480-01
INPUT OFFSET CURRENT
vs. TEMPERATURE
MAX480-02
INPUT BIAS CURRENT
vs. TEMPERATURE
V
S
= ±15V
1.0
INPUT BIAS CURRENT (nA)
0.8
0.6
0.4
0.2
0
MAX480-03
100
V
S
= ±15V
INPUT OFFSET VOLTAGE (μV)
80
1.4
V
S
= ±15V
1.2
INPUT OFFSET CURRENT (nA)
1.0
0.8
0.6
0.4
0.2
0
1.2
60
40
20
0
-75
-50
-25
0
25
50
75
100 125
TEMPERATURE (°C)
-75
-50
-25
0
25
50
75
100 125
-75
-50
-25
0
25
50
75
100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY CURRENT
vs. TEMPERATURE
20
18
SUPPLY CURRENT (μA)
16
14
12
10
8
6
4
2
-75
-50
-25
0
25
50
75
100 125
TEMPERATURE (°C)
0
0
V
S
= ±1.5V
V
S
= ±15V
NO LOAD
MAX480-04
OPEN-LOOP GAIN vs.
SINGLE-SUPPLY VOLTAGE
MAX480-05
OPEN-LOOP GAIN AND
PHASE SHIFT vs. FREQUENCY
V
S
= ±15V
R
L
= 100kΩ
MAX480-06
22
600
R
L
= 10kΩ
500
OPEN-LOOP GAIN (V/mV)
400
300
200
100
T
A
= +25°C
T
A
= +85°C
140
120
OPEN-LOOP GAIN (dB)
100
80
60
40
20
0
GAIN
PHASE
0
45
90
135
180
T
A
= +125°C
5
10
15
20
25
30
0.1
1
10
100
1k
10k
100k
SINGLE-SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
CLOSED-LOOP GAIN
vs. FREQUENCY
MAX480-07
OUTPUT VOLTAGE SWING
vs. LOAD RESISTANCE
MAX480-08
OUTPUT VOLTAGE SWING
vs. LOAD RESISTANCE
POSITIVE SUPPLY
14
OUTPUT VOLTAGE SWING (V)
12
10
8
6
4
2
V
S
= ±15V
0
NEGATIVE SUPPLY
MAX480-09
60
V
S
= ±15V
CLOSED-LOOP GAIN (dB)
40
6
5
4
3
2
1
V+ = 5V
V- = 0
16
20
0
OUTPUT VOLTAGE SWING (V)
-20
10
100
1k
FREQUENCY (Hz)
10k
100k
0
100
1k
10k
100k
LOAD RESISTANCE (Ω)
100
1k
10k
100k
LOAD RESISTANCE (Ω)
4
_______________________________________________________________________________________
PHASE SHIFT (DEGREES)
嵌入式系统
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