MAXIM MAX4036, MAX4039 Technical data

General Description

The single MAX4036/MAX4037 and dual MAX4038/ MAX4039 operational amplifiers operate from a single +1.4V to +3.6V (without reference) or +1.8V to +3.6V (with reference) supply and consume only 800nA of supply current per amplifier, and 1.1µA for the optional reference. The MAX4036/MAX4038 feature a common-mode input voltage range from 0V to VDD- 0.4V at VDD= 1.4V. The MAX4037/MAX4039 feature a 1.232V voltage reference capable of sourcing 100µA and sinking 20µA.

The MAX4036–MAX4039s’ rail-to-rail outputs drive 5kΩ loads to within 25mV of the rails. Ultra-low supply current, low operating voltage, and rail-to-rail outputs make the MAX4036–MAX4039 ideal for use in single-cell lithium-ion (Li+), or two-cell NiCd/NiMH/alkaline battery-powered applications.

The MAX4036 is available in an SC70 package, the MAX4037 in a SOT23 package, and the MAX4038/ MAX4039 in UCSP™, µMAX®, and TDFN packages.

Applications

Battery-Powered/Solar-Powered Systems

Portable Medical Instrumentation

Pagers and Cell Phones

Micropower Thermostats and Potentiostats

Electrometer Amplifiers

Remote Sensor Amplifiers

Active Badges

pH Meters

Features

♦ Ultra-Low 800nA per Amplifier Supply Current ♦ Ultra-Low 1.4V Supply Voltage Operation (1.8V for

MAX4037/MAX4039)

♦ Rail-to-Rail Outputs Drive 5kΩ and 5000pF Load ♦ 1.232V ±0.5%, 120ppm/°C (max) Reference

(MAX4037/MAX4039)

♦ No External Reference Bypass Capacitor

Required

♦ No Phase Reversal for Overdriven Inputs ♦ Low 1.0pA (typ) Input Bias Current ♦ Low 200μV Input Offset Voltage ♦ Unity-Gain Stable ♦ Available in Tiny UCSP, SC70, SOT23, TDFN, and

μMAX Packages

♦ Available in -40°C to +125°C Temperature Range

(MAX4036A/MAX4038A)

MAX4036–MAX4039

Low I

BIAS

, +1.4V/800nA, Rail-to-Rail Op Amps

with +1.2V Buffered Reference

________________________________________________________________

Maxim Integrated Products

1

Typical Operating Circuit

Ordering Information

MAX4039

OUTA

REF

INA-

INA+

V

SS

OUTB

INB-

INB+

V

DD

REF

Functional Diagram

19-3142; Rev 5; 11/09

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.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

-

Denotes a package containing lead.

*

EP = Exposed pad.

Ordering Information continued at end of data sheet.

µMAX is a registered trademark and UCSP is a trademark of Maxim Integrated Products, Inc.

Pin Configurations and Selector Guide appear at end of data sheet.

PART TEMP RANGE

MAX4036EXK-T -40°C to +85°C 5 SC70 AFR

MAX4036AAXK+T -40°C to +125°C 5 SC70 ASN

MAX4037EUT-T -40°C to +85°C 6 SOT23 ABRX

MAX4038ETA-T -40°C to +85°C 8 TDFN-EP* AGO

MAX4038EUA -40°C to +85°C 8 µMAX —

MAX4038EBL-T -40°C to +85°C 9 UCSP AEG

MAX4038AAUA -40°C to +125°C 8 µMAX —

PINPACKAGE

TOP

MARK

3V

V

DD

INA-

OUTA

INA+

MAX4039

REF

INB+

V

THREE-ELECTRODE POTENTIOSTAT APPLICATION

INB-

OUTB

SS

SENSOR

ADC

MAX4036–MAX4039

Low I

BIAS

, +1.4V/800nA, Rail-to-Rail Op Amps

with +1.2V Buffered Reference

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= +3V, VSS= VCM= 0V, V

OUT_

= VDD/2, RLto VDD/2, CL= 15pF, TA= +25°C, unless otherwise specified.)

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.

VDDto VSS.............................................................-0.3V to +4.0V

INA+, INB+, INA-, INB-, IN+, IN-, OUTA,

OUTB, OUT, REF .........................(V

SS

- 0.3V) to (VDD+ 0.3V)

OUTA, OUTB, OUT, REF Shorted to V

SS

or VDD.......Continuous

Maximum Continuous Power Dissipation (T

A

= +70°C)

5-Pin SC70 (derate 3.1mW/°C above +70°C)..............247mW

6-Pin SOT23 (derate 8.7mW/°C above +70°C)............696mW

8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW

8-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW

9-Bump UCSP (derate 5.2mW/°C above +70°C).........412mW

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

10-Pin TDFN (derate 24.4mW/°C above +70°C) .......1951mW

Operating Temperature Range

MAX403_E_ _...................................................-40°C to +85°C

MAX403_A_ _ ................................................-40°C to +125°C

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

Storage Temperature Range .............................-65°C to +150°C

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

Supply Voltage Range V

Supply Current I

OPERATIONAL AMPLIFIERS

Input Offset Voltage V

Input Bias Current I

Input Offset Current I

Input Common-Mode Voltage Range

Common-Mode Rejection Ratio CMRR

Power-Supply Rejection Ratio PSRR

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MAX4036/MAX4038, guaranteed by PSRR tests

DD

MAX4037/MAX4039, guaranteed by PSRR and line regulation tests

MAX4036

MAX4037

DD

MAX4038

MAX4039

OS

(Note 1) ±1.0 ±10 pA

B

OS

V

(Note 1) ±0.3 ±20 pA

Guaranteed by

CM

CMRR test

VDD = 1.4V, VSS ≤ VCM ≤ (VDD - 0.4V) (MAX4036/MAX4038 only)

VDD = 1.8V, VSS ≤ VCM ≤ (VDD - 0.3V) 50 70

= 3.3V, VSS ≤ VCM ≤ (VDD - 0.2V) 56 76

V

DD

1.4V ≤ VDD ≤ 3.6V (MAX4036/MAX4038 only)

1.8V ≤ V

≤ 3.6V 62 84

DD

1.4 3.6

1.8 3.6

VDD = 1.4V 0.8 1.2

= 3.6V 0.9 1.3

V

DD

VDD = 1.8V 1.9 2.4

= 3.6V 2.0 2.5

V

DD

VDD = 1.4V 1.7 2.3

= 3.6V 1.9 2.5

V

DD

VDD = 1.8V 2.8 4.0

V

= 3.6V 3.0 4.1

DD

±0.2 ±2.0 mV

V

= 1.4V

D D

( M AX 4036/M AX 4038 onl y)

VDD = 1.8V V

= 3.3V V

V

DD

V

SS

50 70

62 82

VDD -

0.4

VDD -

0.3

VDD -

0.2

V

µA

V

dB

MAX4036–MAX4039

Low I

BIAS

, +1.4V/800nA, Rail-to-Rail Op Amps

with +1.2V Buffered Reference

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +3V, VSS= VCM= 0V, V

OUT_

= VDD/2, RLto VDD/2, CL= 15pF, TA= +25°C, unless otherwise specified.)

ELECTRICAL CHARACTERISTICS

(VDD= +3V, VSS= VCM= 0V, V

OUT_

= VDD/2, RLto VDD/2, CL= 15pF, TA= T

MIN

to T

MAX

, unless otherwise specified.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Large-Signal Voltage Gain A

Output Voltage Swing High VDD - V

Output Voltage Swing Low VOL - V

Output Short-Circuit Current I

Gain-Bandwidth Product GBW 4 kHz

Phase Margin θ

Slew Rate SR 4 V/ms

Power-On Time t

Input Noise-Voltage Density e

Capacitive-Load Stability C

REFERENCE (MAX4037/MAX4039)

Reference Voltage V

Line Regulation

Load Regulation

Reference Output Voltage Noise e

Output Short-Circuit Current I

Capacitive-Load Stability Range C

VOL

SCO

ON

LOAD

REF

ΔV

REF

ΔV

REF

ΔI

LOAD -20µA ≤ I

SCR

LOAD

RL = 100kΩ, 50mV ≤ V

RL = 5kΩ, 150mV ≤ V

RL = 100kΩ 25

OH

RL = 5kΩ 25 50

RL = 100kΩ 25

SS

RL = 5kΩ 25 50

To VDD or V

M

(Note 3) 0.25 ms f = 1kHz 500 nV/√Hz

n

A

VCL

/

VDD = +1.8V to +3.6V 0.3 %/V

DD

0 ≤ I

/

0.1Hz to 10Hz 60 µV

n

Short to V

(Note 1) 0 250 pF

OUT

≤ (VDD - 150mV) 78 105

OUT

SS

= 1V/V, no sustained oscillations 5000 pF

≤ 100µA, sourcing 0.0015

LOAD

≤ 0, sinking 0.0075

LOAD

DD

SS

- 50mV) 80 108

≤ (V

DD

1.226 1.232 1.238 V

±13 mA

90 Degrees

0.25

1.9

dB

mV

%/µA

P-P

mA

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range V

Supply Current I

DD

MAX4036/MAX4038, guaranteed by PSRR test

MAX4037/MAX4039, guaranteed by PSRR and line regulation tests

MAX4036

MAX4036A

MAX4037

VDD = 1.4V 1.7

= 3.6V 1.8

V

DD

VDD = 1.4V 2.0

V

= 3.6V 2.1

DD

VDD = 1.8V 3.1

V

= 3.6V 3.2

DD

1.4 3.6

V

1.8 3.6

µA

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +3V, VSS= VCM= 0V, V

OUT_

= VDD/2, RLto VDD/2, CL= 15pF, TA= T

MIN

to T

MAX

, unless otherwise specified.) (Note 2)

Note 1: Guaranteed by design. Note 2: All devices are production tested at T

A

= +25°C. All temperature limits are guaranteed by design.

Note 3: Output settles within 1% of final value.

MAX4036–MAX4039

Low I

BIAS

, +1.4V/800nA, Rail-to-Rail Op Amps

with +1.2V Buffered Reference

4 _______________________________________________________________________________________

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Current I

OPERATIONAL AMPLIFIERS

Input Offset Voltage V

Input Offset Voltage Temperature Coefficient

Input Bias Current I

Input Offset Current I

Input Common-Mode Voltage Range

Common-Mode Rejection Ratio CMRR

Power-Supply Rejection Ratio PSRR

Large-Signal Voltage Gain A

Output Voltage Swing High V

Output Voltage Swing Low VOL - V

REFERENCE (MAX4037/MAX4039)

Reference Voltage Temperature Coefficient

Line Regulation

Load Regulation

Capacitive-Load Stability Range C

MAX4038

TCV

V

DD

TCV

ΔV

ΔV ΔI

DD

OS

CM

VOL

LOAD

MAX4038A

MAX4039

OS

B

Guaranteed by CMRR test

VDD = 1.4V, VSS ≤ VCM ≤ (VDD - 0.5V) (MAX4036/MAX4038 only)

VDD = 1.8V, VSS ≤ VCM ≤ (VDD - 0.4V) 50

V

= 3.3V, VSS ≤ VCM ≤ (VDD - 0.3V) 52

DD

1.4V ≤ VDD ≤ 3.6V (MAX4036/MAX4038 only)

1.8V ≤ V

RL = 100kΩ, 50mV ≤ V

RL = 5kΩ, 150mV ≤ V

RL = 100kΩ 10

- V

OH

RL = 5kΩ 100

RL = 100kΩ 10

SS

RL = 5kΩ 100

(Note 1)

REF

/

REF

VDD = 1.8V to 3.6V 0.6 %/V

DD

0 ≤ I

/

REF

-20µA ≤ I

(Note 1) 0 250 pF

≤ 3.6V 60

DD

MAX4037EUT-T, MAX4039ETB, MAX4039EUB

MAX4039EBL-T 35 200

≤ 100µA, sourcing 0.003

LOAD

≤ 0, sinking 0.015

LOAD

VDD = 1.4V 2.9

V

= 3.6V 3.2

DD

VDD = 1.4V 3.4

V

= 3.6V 3.7

DD

VDD = 1.8V 5.2

V

= 3.6V 5.3

DD

VDD = 1.4V (MAX4036/MAX4038 only)

VDD = 1.8V V

V

= 3.3V V

DD

OUT

≤ (VDD - 50mV) 75

≤ (VDD - 150mV) 73

V

44

60

µA

±8 mV

±1 µV/°C

±100 pA

±200 pA

SS

25 120

VDD -

0.4

VDD -

0.4

VDD -

0.2

V

dB

mV

ppm/°C

%/µA

MAX4036–MAX4039

Low I

BIAS

, +1.4V/800nA, Rail-to-Rail Op Amps

with +1.2V Buffered Reference

_______________________________________________________________________________________

5

Typical Operating Characteristics

(VDD= 3V, VSS= VCM= 0V, RLto VDD/2, TA= +25°C, unless otherwise noted.)

MAX4036

SUPPLY CURRENT

vs. SUPPLY VOLTAGE AND TEMPERATURE

1.6

1.2

0.8

SUPPLY CURRENT (μA)

0.4

0

1.4 3.4

TA = +85°C

TA = -40°C

SUPPLY VOLTAGE (V)

TA = +25°C

3.02.62.21.8

MAX4039

SUPPLY CURRENT

vs. SUPPLY VOLTAGE AND TEMPERATURE

5

4

3

2

SUPPLY CURRENT (μA)

1

TA = +85°C

TA = -40°C

TA = +25°C

3.0

2.5

MAX4036 toc01

2.0

1.5

1.0

SUPPLY CURRENT (μA)

0.5

1.0

MAX4036 toc04

0.8

0.6

0.4

OFFSET VOLTAGE (mV)

0.2

vs. SUPPLY VOLTAGE AND TEMPERATURE

0

1.8 3.6

vs. COMMON-MODE VOLTAGE

VDD = 1.4V

MAX4037

SUPPLY CURRENT

TA = +85°C

TA = -40°C

SUPPLY VOLTAGE (V)

TA = +25°C

OFFSET VOLTAGE

VDD = 1.8V

VDD = 3.0V

MAX4038

vs. SUPPLY VOLTAGE AND TEMPERATURE

3.0

2.5

MAX4036 toc02

2.0

1.5

1.0

SUPPLY CURRENT (μA)

0.5

3.33.02.72.42.1

MAX4036 toc05

0

1.4 3.4

0.30

0.20

0.10

0

-0.10

OFFSET VOLTAGE (mV)

-0.20

SUPPLY CURRENT

TA = +85°C

TA = -40°C

SUPPLY VOLTAGE (V)

TA = +25°C

OFFSET VOLTAGE

vs. TEMPERATURE

MAX4036 toc03

3.02.62.21.8

MAX4036 toc06

0

1.8 3.6 SUPPLY VOLTAGE (V)

INPUT BIAS CURRENT

vs. TEMPERATURE

40

30

20

10

INPUT BIAS CURRENT (pA)

0

-10

-40 85

TEMPERATURE (°C)

VCM = 3V

VCM = 0V

0

3.33.02.72.42.1

03

COMMON-MODE VOLTAGE (V)

21

INPUT BIAS CURRENT

vs. COMMON-MODE VOLTAGE

40

MAX4036 toc07

30

TA = +85°C

20

INPUT BIAS CURRENT (pA)

10

TA = +25°C

603510-15

0

0 3.0

COMMON-MODE VOLTAGE (V)

2.52.01.51.00.5

MAX4036 toc08

-0.30

-40 85 TEMPERATURE (°C)

OP AMP POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

0

AV = 1V/V

-10

-20

-30

-40

-50

PSRR (dB)

-60

-70

-80

-90

-100 10

FREQUENCY (Hz)

603510-15

MAX4036 toc09

10k1k100

MAX4036–MAX4039

Low I

BIAS

, +1.4V/800nA, Rail-to-Rail Op Amps

with +1.2V Buffered Reference

6 _______________________________________________________________________________________

)

E

Typical Operating Characteristics (continued)

(VDD= 3V, VSS= VCM= 0V, RLto VDD/2, TA= +25°C, unless otherwise noted.)

OUTPUT VOLTAGE SWING HIGH

vs. TEMPERATURE

30

25

20

(mV)

OH

15

- V

DD

V

10

RL = 5kΩ

5

0

RL = 100kΩ

-40 85 TEMPERATURE (°C)

603510-15

MAX4036 toc10

(mV)

- V V

AV

vs. OUTPUT SWING HIGH

140

(dB)

V

A

120

100

RL = 5kΩ

RL = 100kΩ

80

60

MAX4036 toc13

OUTPUT VOLTAGE SWING LOW

vs. TEMPERATURE

35

30

25

RL = 5kΩ

20

SS

15

OL

10

5

0

-40 85

RL = 100kΩ

TEMPERATURE (°C)

AV

vs. TEMPERATURE

140

120

(dB)

VOL

A

100

80

60

40

20

RL = 100kΩRL = 5kΩ

vs. OUTPUT SWING LOW

AV

140

MAX4036 toc11

120

100

(dB)

V

A

80

60

603510-15

40

0 500

RL = 5kΩ

MAX4036 toc12

RL = 100kΩ

400300100 200

VOL (mV)

CROSSTALK

vs. FREQUENCY

0

MAX4038/MAX4039

MAX4036 toc14

AV = 1V/V

-20

-40

-60

CROSSTALK (dB)

-80

MAX4036 toc15

RL = 5kΩ

RL = 100kΩ

40

0 500

VDD - VOH (mV)

400300100 200

TOTAL HARMONIC DISTORTION PLUS NOIS

vs. FREQUENCY

100

10

1

THD+N (%)

0.1

0.01

V RL = 100kΩ TO V

0.1 10 100 FREQUENCY (kHz)

V

= 2.5V

OUT

RL = 5kΩ TO V

= 2.5V

OUT

1

AV = 1V/V V

IN_

P-P

= VDD/2

MAX4036 toc16

SS

0

-40 85 TEMPERATURE (°C

OP AMP STABILITY

vs. CAPACITIVE AND RESISTIVE LOADS

100,000

UNSTABLE REGION

10,000

1000

CAPACITIVE LOAD (pF)

STABLE REGION

100

10k 100k 1M

RESISTIVE LOAD (Ω)

603510-15

RL TO V

-100 0

0.1 10k 100k

OP AMP SINK CURRENT

vs. OUTPUT VOLTAGE

14

VID = -100mV

12

MAX4036 toc17

10

8

6

SINK CURRENT (mA)

4

SS

2

0

0 3.0

1k

FREQUENCY (Hz

VDD = 1.8V

V

(V)

OUT_

VDD = 3.0V

2.41.81.20.6

MAX4036 toc18

MAX4036–MAX4039

Low I

BIAS

, +1.4V/800nA, Rail-to-Rail Op Amps

with +1.2V Buffered Reference

________________________________________________________________________________________

7

Typical Operating Characteristics (continued)

(VDD= 3V, VSS= VCM= 0V, RLto VDD/2, TA= +25°C, unless otherwise noted.)

OP AMP SOURCE CURRENT

vs. OUTPUT VOLTAGE

18

16

14

12

10

8

6

SOURCE CURRENT (mA)

4

2

0

VDD = 3.0V

VDD = 1.8V

0 3.0

V

(V)

OUT_

OP AMP

SMALL-SIGNAL TRANSIENT RESPONSE

AV = 1V/V

2.55V

2.45V

2.55V

2.45V

C RL = 1MΩ TO V

VID = +100mV

2.41.81.20.6

= 12pF TO V

L

INPUT VOLTAGE NOISE DENSITY

vs. FREQUENCY

3500

MAX4036 toc19

3000

2500

2000

1500

1000

INPUT VOLTAGE NOISE (nV/√Hz)

500

0

0.1 10k FREQUENCY (Hz)

MAX4036 toc20

1k100101

OP AMP

SMALL-SIGNAL TRANSIENT RESPONSE

AV = 1V/V

= 250pF TO V

SS

MAX4036 toc21

SS

V

IN

V

OUT_

2.55V

+

2.45V

2.55V

2.45V

C

L

RL = 1MΩ TO V

SS

MAX4036 toc22

SS

VIN+

V

OUT_

40μs/div

LARGE-SIGNAL TRANSIENT RESPONSE

OP AMP

2.5V

1.5V

100μs/div

AV = 1V/V

= 12pF TO V

C

L

RL = 1MΩ TO V

TURN-ON TRANSIENT RESPONSE

SS

MAX4036 toc23

SS

VIN+

V

OUT_

500mV/div

OP AMP

100μs/div

AV = 1V/V

= 12pF TO GND

C

L

= 1MΩ TO GND

R

L

+ = VDD / 2

V

IN

3.0V

MAX4036 toc24

V

DD

0V

V

OUT_

50mV/div