Rainbow Electronics MAX4244 User Manual

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________________General Description

The MAX4240–MAX4244 family of micropower op amps
operate from a single +1.8V to +5.5V supply or dual
±0.9V to ±2.75V supplies and have Beyond-the-Rails™
inputs and Rail-to-Rail®output capabilities. These
amplifiers provide a 90kHz gain-bandwidth product
while using only 10µA of supply current per amplifier.
The MAX4241/MAX4243 have a low-power shutdown
mode that reduces supply current to less than 1µA and
forces the output into a high-impedance state. Although
the minimum operating voltage is specified at +1.8V,
these devices typically operate down to +1.5V. The
combination of ultra-low-voltage operation, beyond-the­rails inputs, rail-to-rail outputs, and ultra-low power con­sumption makes these devices ideal for any portable/
two-cell battery-powered system.

These amplifiers have an input common-mode range
that extends 200mV beyond each rail, and their outputs
typically swing to within 9mV of the rails with a 100kΩ
load. Beyond-the-rails input and rail-to-rail output char­acteristics allow the full power-supply voltage to be
used for signal range. The combination of low input off­set voltage, low input bias current, and high open-loop
gain makes them suitable for low-power/low-voltage
precision applications.

The MAX4240 is offered in a space-saving 5-pin SOT23
package. All specifications are guaranteed over the

-40°C to +85°C extended temperature range.

________________________Applications

Two-Cell Battery- Strain Gauges
Powered Systems

Sensor Amplifiers

Portable/Battery-Powered Cellular Phones
Electronic Equipment

Notebook Computers

Digital Scales PDAs

____________________________Features

♦ Ultra-Low-Voltage Operation:

Guaranteed Down to +1.8V
Typical Operation to +1.5V

♦ Ultra-Low Power Consumption:

10µA Supply Current per Amplifier
1µA Shutdown Mode (MAX4241/MAX4243)
Up to 200,000 Hours Operation from Two AA
Alkaline Cells

♦ Beyond-the-Rails Input Common-Mode Range
♦ Outputs Swing Rail-to-Rail
♦ No Phase Reversal for Overdriven Inputs
♦ 200µV Input Offset Voltage
♦ Unity-Gain Stable for Capacitive Loads up to 200pF
♦ 90kHz Gain-Bandwidth Product
♦ Available in Space-Saving 5-Pin SOT23 and

8-Pin µMAX Packages

MAX4240–MAX4244

Single/Dual/Quad, +1.8V/10µA, SOT23,

Beyond-the-Rails Op Amps

________________________________________________________________

Maxim Integrated Products

1

V

EE

IN-IN+

15V

CC

OUT

MAX4240

SOT23-5

TOP VIEW

2

34

_________________Pin Configurations

19-1343; Rev 0; 3/98

PART

MAX4240EUK-T
MAX4241EUA

MAX4241ESA -40°C to +85°C

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

5 SOT23-5
8 µMAX
8 SO

_______________Ordering Information

Pin Configurations continued at end of data sheet.

_____________________Selector Guide

NO. OF

AMPS

PIN-PACKAGE

MAX4240 1 5-pin SOT23
MAX4241 1 8-pin µMAX/SO

PART

MAX4242 2 8-pin µMAX/SO

SHUTDOWN

—

Yes

—

MAX4243 2

10-pin µMAX,
14-pin SO

MAX4244 4 14-pin SO

Yes

—

Beyond-the-Rails is a trademark of Maxim Integrated Products.
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.

MAX4242EUA
MAX4242ESA
MAX4243EUB

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C 8 µMAX
8 SO
10 µMAX

MAX4243ESD
MAX4244ESD

-40°C to +85°C

-40°C to +85°C 14 SO
14 SO

SOT

TOP MARK

ACCS

—
—
—
—
—
—
—

MAX4240–MAX4244

Single/Dual/Quad, +1.8V/10µA, SOT23,
Beyond-the-Rails Op Amps

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS — T

A

= +25°C

(VCC= +1.8V to +5.5V, VEE= 0, VCM= 0, V

OUT

= VCC/ 2, RL= 100kΩ tied to VCC/ 2, SHDN = VCC, TA= +25°C, unless

otherwise noted.) (Note 1)

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 (VCCto VEE)....................................................6V

All Other Pins ...................................(V

CC

+ 0.3V) to (VEE- 0.3V)

Output Short-Circuit Duration (to V

CC

or VEE)............Continuous

Continuous Power Dissipation (T

A

= +70°C)

5-pin SOT23 (derate 7.1mW/°C above +70°C).............571mW

8-pin µMAX (derate 4.1mW/°C above +70°C)..............330mW

8-pin SO (derate 5.88mW/°C above +70°C).................471mW

10-pin µMAX (derate 5.6mW/°C above +70°C)............444mW

14-pin SO (derate 8.33mW/°C above +70°C)...............667mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range.............................-65°C to +160°C

Lead Temperature (soldering, 10sec).............................+300°C

PARAMETER SYMBOL MIN TYP MAX UNITS

Input Bias Current I

B

±2 ±6 nA

CONDITIONS

Input Offset Voltage V

OS

±0.20 ±0.75

mV

MAX4241ESA

(VEE- 0.2V) ≤ VCM≤
(VCC+ 0.2V)

±0.25 ±1.40

MAX4240EUK/MAX424_EUA/
MAX4243EUB

±0.20 ±0.88

MAX4242ESA/MAX4243ESD/
MAX4244ESD

Supply Current
per Amplifier

I

CC

10 12

µA

VCC= 1.8V

SHDN = V

CC

14 18VCC= 5.0V

2.0 3.0VCC= 5.0V

Shutdown Supply
Current (Note 2)

I

CC(SHDN)

1.0 1.5
µA

VCC= 1.8V

SHDN = V

EE

Supply-Voltage Range V

CC

1.8 5.5 VInferred from PSRR test

(Note 3)
(Note 3)Input Offset Current I

OS

±0.5 ±1.5 nA



V

IN+

- V

IN-



< 1.0V

Differential Input
Resistance

R

IN(DIFF)

45 MΩ



V

IN+

- V

IN-



> 2.5V

4.4 kΩ

Inferred from the CMRR test

Input Common-Mode
Voltage Range

V

CM

VEE- 0.2 VCC+ 0.2 V

VCC= 1.8V

Common-Mode
Rejection Ratio
(Note 4)

CMRR

72 90

dB

MAX4241ESA

72 90

MAX4242ESA/MAX4243ESD/
MAX4244ESD

66 88

MAX4240EUK/MAX424_EUA/
MAX4243EUB

VCC= 5.0V

77 94MAX4241ESA
77 94

MAX4242ESA/MAX4243ESD/
MAX4244ESD

72 90

MAX4240EUK/MAX424_EUA/
MAX4243EUB

Single/Dual/Quad, +1.8V/10µA, SOT23,

Beyond-the-Rails Op Amps

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS — TA= +25°C (continued)

(VCC= +1.8V to +5.5V, VEE= 0, VCM= 0, V

OUT

= VCC/ 2, RL= 100kΩ tied to VCC/ 2, SHDN = VCC, TA= +25°C, unless

otherwise noted.) (Note 1)

Channel-to-Channel
Isolation (Note 6)

CH

ISO

80 dBSpecified at DC

Phase Margin

Φ

m

68 degrees

Gain Margin G

m

18 dB

Slew Rate SR 40 V/ms

SHDN Input Bias
Current (Note 2)

IIH, I

IL

40 80 nA

SHDN = VCC= 5.5V or SHDN = VEE= 0

SHDN Logic Low

(Note 2)

V

IL

0.3 x V

CC

V

6 15

PARAMETER SYMBOL MIN TYP MAX UNITS

23 35

Specified as
VEE- VOL

Output Voltage
Swing Low

10 20

V

OL

40 60

mV

VCC= 5.0V

RL= 10kΩ

RL= 100kΩ

RL= 100kΩ

VCC= 1.8V

RL= 10kΩ

8 20

40 65

Specified as
VCC- VOH

Output Voltage
Swing High

10 25

80 85

V

OH

70 73

60 95

mV

VCC= 5.0V

RL= 10kΩ

2.5

mA

SHDN Logic High
(Note 2)

V

IH

0.7 x V

CC

V

(VEE+ 0.2V) ≤ V

OUT

≤

(VCC- 0.2V)

Large-Signal
Voltage Gain

90 94

A

VOL

82 85

dB

RL= 100kΩ

RL= 100kΩ

CONDITIONS

Sinking

VCC= 1.8V

RL= 10kΩ

VCC= 5.0V

RL= 10kΩ

RL= 100kΩ

RL= 100kΩ

RL= 10kΩ

VCC= 1.8V

Gain-Bandwidth
Product

GBW 90 kHz

Power-Supply
Rejection Ratio

PSRR

80 85

dB

MAX4241ESA

1.8V ≤ VCC≤ 5.5V

MAX4240–MAX4244

78 82

MAX4240EUK/MAX424_EUA/
MAX4243EUB

80 85

MAX4242ESA/MAX4243ESD/
MAX4244ESD

Output Leakage
Current in Shutdown
(Notes 2, 5)

I

OUT(SHDN)

20 50 nA

SHDN = VEE= 0, VCC= 5.5V

Output Short-Circuit
Current

I

OUT(SC)

Sourcing 0.7

MAX4240–MAX4244

Single/Dual/Quad, +1.8V/10µA, SOT23,
Beyond-the-Rails Op Amps

4 _______________________________________________________________________________________

Enable Time from
Shutdown

t

ENABLE

150

Input Voltage Noise
Density

e

n

70

nV/√Hz

Input Current Noise
Density

i

n

0.05

pA/√Hz

Capacitive-Load
Stability

200 pF

Shutdown Time t

SHDN

50 µs

µs

Power-Up Time t

ON

200 µs

Input Capacitance C

IN

3 pF

f = 1kHz

f = 1kHz

A

VCL

= +1V/V, no sustained oscillations

PARAMETER SYMBOL MIN TYP MAX UNITS

Total Harmonic
Distortion

THD 0.05 %

Settling Time to 0.01% t

S

CONDITIONS

50 µs

fIN= 1kHz, VCC= 5.0V, V

OUT

= 2Vp-p, AV= +1V/V

AV= +1V/V, VCC= 5.0V, V

OUT

= 2V

STEP

ELECTRICAL CHARACTERISTICS — TA= +25°C (continued)

(VCC= +1.8V to +5.5V, VEE= 0, VCM= 0, V

OUT

= VCC/ 2, RL= 100kΩ tied to VCC/ 2, SHDN = VCC, TA= +25°C, unless

otherwise noted.) (Note 1)

ELECTRICAL CHARACTERISTICS — TA= T

MIN

to

T

MAX

(VCC= +1.8V to +5.5V, VEE= 0, VCM= 0, V

OUT

= VCC/ 2, RL= 100kΩ tied to VCC/ 2, SHDN = VCC, TA= T

MIN

to T

MAX

, unless oth-

erwise noted.) (Note 1)

SHDN = V

CC

±1.2

Inferred from PSRR test

Inferred from the CMRR test

(Note 3)

CONDITIONS

MAX4241ESA

(VEE- 0.2V) ≤ VCM≤
(VCC+ 0.2V)

mVV

OS

Input Offset Voltage

µA

19

I

CC

SHDN = V

EE

14

V1.8 5.5V

CC

Supply-Voltage Range
Supply Current

per Amplifier

V-0.2 VCC+ 0.2V

CM

Input Common-Mode
Voltage Range

µV/°C2TC

VOS

Input Offset Voltage
Drift

nA±7I

OS

Input Offset Current

UNITSMIN TYP MAXSYMBOLPARAMETER

µA

3.5

I

CC(SHDN)

2.0

Shutdown Supply
Current (Note 2)

VCC= 1.8V
VCC= 5.0V
VCC= 1.8V
VCC= 5.0V

(Note 3) nA±15I

B

Input Bias Current

±1.3

MAX4242ESA/MAX4243ESD/
MAX4244ESD

±2.0

MAX4240EUK/MAX424_EUA/
MAX4243EUB

MAX4240–MAX4244

Single/Dual/Quad, +1.8V/10µA, SOT23,

Beyond-the-Rails Op Amps

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS — TA= T

MIN

to

T

MAX

(continued)

(VCC= +1.8V to +5.5V, VEE= 0, VCM= 0, V

OUT

= VCC/ 2, RL= 100kΩ tied to VCC/ 2, SHDN = VCC, TA= T

MIN

to T

MAX

, unless oth-

erwise noted.) (Note 1)

68

MAX4242ESA/MAX4243ESD/
MAX4244ESD

68

SHDN = V

EE

= 0, VCC= 5.5V

RL= 10kΩ

64

CONDITIONS

MAX4240EUK/MAX424_EUA/
MAX4243EUB

MAX4241ESA

VCC= 1.8V

dBCMRR

Common-Mode
Rejection Ratio
(Note 4)

nA100I

OUT(SHDN)

Output Leakage
Current in Shutdown
(Notes 2, 5)

76

UNITSMIN TYP MAXSYMBOLPARAMETER

RL= 100kΩ

dB

76

A

VOL

Large-Signal
Voltage Gain

74

MAX4242ESA/MAX4243ESD/
MAX4244ESD

74

70

MAX4240EUK/MAX424_EUA/
MAX4243EUB

MAX4241ESA

VCC= 5.0V

76

MAX4242ESA/MAX4243ESD/
MAX4244ESD

76

74

MAX4240EUK/MAX424_EUA/
MAX4243EUB

MAX4241ESA

1.8V ≤ VCC≤ 5.5V dBPSRR

Power-Supply
Rejection Ratio

RL= 100kΩ 84

RL= 10kΩ 66

(VEE+ 0.2V) ≤ V

OUT

≤

(VCC- 0.2V)

VCC= 1.8V

VCC= 5.0V

RL= 100kΩ

dB

25

V

OH

Output Voltage
Swing High

RL= 100kΩ 30
RL= 10kΩ

VCC= 1.8V

RL= 10kΩ 95

VCC= 5.0V

Specified as
VCC- VOH

145

RL= 100kΩ

dB

20

V

OL

Output Voltage
Swing Low

RL= 100kΩ 25
RL= 10kΩ

VCC= 1.8V

RL= 10kΩ 50

VCC= 5.0V

Specified as
V

EE

- VOL
75

V0.3 x V

CC

V

IL

SHDN Logic Low
(Note 2)