Rainbow Electronics MAX480 User Manual

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General Description

The MAX480 is a precision micropower operational ampli­fier 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 neg­ative supply rail, allowing maximum signal range capabili­ty 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 con­sumes 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.

Applications

Precision Micropower Amplifiers
Micropower Signal Processing
Battery-Powered Analog Circuits

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

High-Precision, Low-Voltage,

Micropower Op Amp

________________________________________________________________

Maxim Integrated Products

1

MAX480

OUT

V

IN

HP5082-2800

IN914

6

7

4

2

3

V+ (5V)

R2

10k

R1

10k

R3
100k

SINGLE OP AMP FULL-WAVE RECTIFIER

Typical Operating Circuit

19-2772; Rev 3a; 1/98

PART

MAX480CPA
MAX480CSA 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

8 Plastic DIP
8 SO

Pin Configuration

Ordering Information

MAX480EPA
MAX480ESA -40°C to +85°C

-40°C to +85°C 8 Plastic DIP
8 SO

MAX480MJA -55°C to +125°C 8 CERDIP

OUT

NULLV-

1
2

87N.C.

V+IN-

IN+

NULL

DIP/SO

TOP VIEW

3

4

6

5

MAX480

MAX480

High-Precision, Low-Voltage,
Micropower Op Amp

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VS= ±1.5V to ±15V, TA= +25°C, unless otherwise noted.)

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 (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

f

O

= 0.1Hz to 10Hz, VS= ±15V

AV= +1V/V, no oscillations (Note 2)

VCM= 0

VS= ±15V

VCM= 0

V+ = 5V, V- = 0, RL= 10kΩ

V+ = 5V, V- = 0, RL= 2kΩ

V+ = 5V, V- = 0

VS= ±15V

VS= ±15V,
VO= ±10V

CONDITIONS

µVp-p3e

np-p

Input Noise Voltage

pF250 650Capacitive Load Stability

µA

915

I

SY

Supply Current

V/ms512SRSlew Rate

µV/V1.0 12PSRRPower-Supply Rejection Ratio

V

100 500

V

O

4.0 4.2

±14 ±14.2

V

0/4

IVRInput Voltage

nA13I

B

Input Bias Current

nA0.2 1I

OS

µV25 140V

OS

Input Offset Voltage
Input Offset Current

V/mV

500 1200

UNITSMIN TYP MAXSYMBOLPARAMETER

VS= ±15V

VS= ±15V

GΩ20R

INCM

Common-Mode Input Resistance

MΩ30R

IN

Differential-Mode Input Resistance

V

OL

V

OH

Output Voltage Swing

V+ = 5V, V- = 0, 0 < VCM< 4V

dB

85 110

CMRRCommon-Mode Rejection Ratio

VS= ±1.5V

µV

RL= 100kΩ

RL= 2kΩ

RL= 10kΩ

75 250

200 600

RL= 100kΩ

V+ = 5V, V- = 0,
1V < VO< 4V

RL= 10kΩ

A

VO

Large-Signal Voltage Gain

50 180

100 400

VS= ±15kV (Note 1) -15/13.5

RL= 10kΩ
RL= 2kΩ ±11 ±12

VS= ±15V, -15V < VCM< 13.5V 90 130

VS= ±15V 14 20

MAX480

High-Precision, Low-Voltage,

Micropower Op Amp

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS

(VS= ±1.5V to ±15V, TA= T

MIN

to T

MAX

, unless otherwise noted.)

VCM= 0

VS= ±1.5V

(Note 2)

VS= ±15V

CONDITIONS

µA

12 25

I

SY

Supply Current

µV/V1.0 12PSRR

Power-Supply
Rejection Ratio

V

O

±13.5 ±14

nA0.2 2.0I

OS

Input Offset
Current

µV/°C0.3 2.0TCV

OS

µV40 220V

OS

Input Offset
Voltage

Input Offset
Voltage Drift

A

VO

Large-Signal
Voltage Gain

350 950

UNITS

MAX480C

MIN TYP MAX

SYMBOLPARAMETER

Note 1: Guaranteed by CMRR test.
Note 2: Guaranteed by design.

VCM= 0 nA13I

B

Input Bias
Current

V+ = 5V, V- = 0

V

0/3.5

IVR

Input Voltage
Range

25

13 25

1.0 12

0/3.5

±13.5 ±14

0.3 2.0

0.3 2.0

50 250

350 800

MAX480E

MIN TYP MAX

37

15 25

3.2 15

0/3.5

±13.5 ±13.7

0.5 2.0

0.3 2.0

70 300

60 400

MAX480M

MIN TYP MAX

V+ = 5V, V- = 0
RL= 2kΩ

3.9 4.1V

OH

3.9 4.1 3.9 4.1

V+ = 5V, V- = 0
RL= 10kΩ

100 500V

OL

µV100 500 100 500

85 110

V+ = 5V, V- = 0,
0 < V

CM

< 3.5V

85 110 80 105

VS= ±15V,
V = ±10V

RL= 100kΩ
RL= 10kΩ
RL= 2kΩ 55 125

130 400

55 150

130 400

30 110

45 240

V+ = 5V,
V- = 0,
1V < VO< 4V

30 150

RL= 100kΩ
RL= 10kΩ 30 140 22 110

50 280

V/mV

50 360 35 200

VS= ±15V (Note 1) -15/13.5 -15/13.5 -15/13.5

RL= 10kΩ
RL= 2kΩ

Output Voltage
Swing

V

±10.5 ±11.8 ±10.5 ±11.8 ±10.5 ±11.5

VS= ±15V,

-15V < V

CM

< 13.5V

CMRR

Common-Mode
Rejection Ratio

90 120 90 120 85 115

dB

VS= ±15V 16 30 17 30 19 30

MAX480

High-Precision, Low-Voltage,
Micropower Op Amp

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

0

20

60

40

80

100

-75 -25 0-50 25 50 75 100 125

INPUT OFFSET VOLTAGE

vs. TEMPERATURE

MAX480-01

TEMPERATURE (°C)

INPUT OFFSET VOLTAGE (µV)

VS = ±15V

0

0.2

1.0

0.8

0.6

0.4

1.2

1.4

-75 -25 0-50 25 50 75 100 125

INPUT OFFSET CURRENT

vs. TEMPERATURE

MAX480-02

TEMPERATURE (°C)

INPUT OFFSET CURRENT (nA)

VS = ±15V

0

0.2

0.8

0.6

0.4

1.0

1.2

-75 -25 0-50 25 50 75 100 125

INPUT BIAS CURRENT

vs. TEMPERATURE

MAX480-03

TEMPERATURE (°C)

INPUT BIAS CURRENT (nA)

VS = ±15V

2

6
4

16
14

12
10

8

18

20

22

-75 -25 0-50 25 50 75 100 125

SUPPLY CURRENT

vs. TEMPERATURE

MAX480-04

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

VS = ±15V

VS = ±1.5V

NO LOAD

60

-20
10 1k 10k100 100k

CLOSED-LOOP GAIN

vs. FREQUENCY

MAX480-07

FREQUENCY (Hz)

CLOSED-LOOP GAIN (dB)

0

20

40

VS = ±15V

0

200

100

400

300

500

600

010155 202530

OPEN-LOOP GAIN vs.

SINGLE-SUPPLY VOLTAGE

MAX480-05

SINGLE-SUPPLY VOLTAGE (V)

OPEN-LOOP GAIN (V/mV)

RL = 10kΩ

TA = +25°C

TA = +85°C

TA = +125°C

0

40

20

100

80

60

120

140

0.1 10 1001 1k 10k 100k

OPEN-LOOP GAIN AND

PHASE SHIFT vs. FREQUENCY

MAX480-06

FREQUENCY (Hz)

OPEN-LOOP GAIN (dB)

GAIN

PHASE

VS = ±15V
R

L

= 100kΩ

135

180

0

45

90

PHASE SHIFT (DEGREES)

0

100 100k10k1k

OUTPUT VOLTAGE SWING

vs. LOAD RESISTANCE

2

3

6

1

5

4

MAX480-08

LOAD RESISTANCE (Ω)

OUTPUT VOLTAGE SWING (V)

V+ = 5V
V- = 0

0

100 100k10k1k

OUTPUT VOLTAGE SWING

vs. LOAD RESISTANCE

4

6

8

16

2

14
12
10

MAX480-09

LOAD RESISTANCE (Ω)

OUTPUT VOLTAGE SWING (V)

VS = ±15V

POSITIVE SUPPLY

NEGATIVE SUPPLY

MAX480

High-Precision, Low-Voltage,

Micropower Op Amp

_______________________________________________________________________________________

5

20

11k10010

POWER-SUPPLY REJECTION

RATIO vs. FREQUENCY

60

120

40

100

80

MAX480-10

FREQUENCY (Hz)

POWER-SUPPLY REJECTION (dB)

POSITIVE SUPPLY

NEGATIVE SUPPLY

40

11k10010

COMMON-MODE REJECTION

RATIO vs. FREQUENCY

80

140

60

120

100

MAX480-11

FREQUENCY (Hz)

COMMON-MODE REJECTION (dB)

VS = ± 15V

1000

1

0.1 10 10011k

NOISE VOLTAGE DENSITY

vs. FREQUENCY

MAX480-12

FREQUENCY (Hz)

NOISE VOLTAGE DENSITY (nV/√Hz)

10

100

VS = ±15V

100

0.1

0.1 10 10011k

CURRENT NOISE DENSITY

vs. FREQUENCY

MAX480-13

FREQUENCY (Hz)

CURRENT NOISE DENSITY (pA/√Hz)

1

10

VS = ±15V

VS = ±15V, AV = +1,
R

L

= 10kΩ, CL = 500pF

100µs/div

SMALL-SIGNAL

TRANSIENT RESPONSE

MAX480-14

VS = ±15V, AV = +1,
R

L

= 10kΩ, CL = 500pF

LARGE-SIGNAL

TRANSIENT RESPONSE

MAX480-15

1ms/div

Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

MAX480

High-Precision, Low-Voltage,
Micropower Op Amp

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.

6

_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

Package Information

IN-

OUT

V-

7

6

4

5

100k

V+

2

3

1

IN+

MAX480

Figure 1. Offset Nulling Circuit

MAX480

6

4

7

2

3

+15V

-15V

Figure 2. Burn-In Circuit

SOICN.EPS