MAX4039

Manufacturer Part NumberMAX4039
DescriptionThe single MAX4036/MAX4037 and dual MAX4038/MAX4039 operational amplifiers operate from a single +1
ManufacturerMaxim
MAX4039 datasheet
 
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19-3142; Rev 5; 11/09
Low I
, +1.4V/800nA, Rail-to-Rail Op Amps
BIAS
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 refer-
ence. The MAX4036/MAX4038 feature a common-mode
input voltage range from 0V to V
- 0.4V at V
DD
The MAX4037/MAX4039 feature a 1.232V voltage refer-
ence 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.
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
Pin Configurations and Selector Guide appear at end of
data sheet.
µMAX is a registered trademark and UCSP is a trademark of
Maxim Integrated Products, Inc.
Functional Diagram
OUTA
MAX4039
INA-
INA+
REF
REF
V
SS
________________________________________________________________ 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.
with +1.2V Buffered Reference
♦ 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)
= 1.4V.
DD
♦ 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)
Applications
PART
MAX4036EXK-T
MAX4036AAXK+T
MAX4037EUT-T
MAX4038ETA-T
MAX4038EUA
MAX4038EBL-T
MAX4038AAUA
+ Denotes a lead(Pb)-free/RoHS-compliant package.
- Denotes a package containing lead.
* EP = Exposed pad.
Ordering Information continued at end of data sheet.
V
DD
OUTB
INB-
INB+
Features
Ordering Information
PIN-
TEMP RANGE
PACKAGE
-40°C to +85°C
5 SC70
-40°C to +125°C
5 SC70
-40°C to +85°C
6 SOT23
-40°C to +85°C
8 TDFN-EP*
-40°C to +85°C
8 µMAX
-40°C to +85°C
9 UCSP
-40°C to +125°C
8 µMAX
Typical Operating Circuit
3V
INA-
V
OUTA
DD
INA+
SENSOR
MAX4039
REF
INB-
INB+
OUTB
ADC
V
SS
THREE-ELECTRODE POTENTIOSTAT APPLICATION
TOP
MARK
AFR
ASN
ABRX
AGO
AEG
1

MAX4039 Summary of contents

  • Page 1

    ... 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/ ® ...

  • Page 2

    ... Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300° 15pF +25°C, unless otherwise specified CONDITIONS MAX4036/MAX4038, guaranteed by PSRR tests V DD MAX4037/MAX4039, guaranteed by PSRR and line regulation tests V = 1.4V DD MAX4036 1.8V DD MAX4037 ...

  • Page 3

    ... Short SCR Short (Note 1) LOAD / / 15pF MIN CONDITIONS MAX4036/MAX4038, guaranteed by PSRR test V DD MAX4037/MAX4039, guaranteed by PSRR and line regulation tests V = 1.4V DD MAX4036 1.4V DD MAX4036A 3. 1.8V DD MAX4037 V = 3.6V DD MIN ...

  • Page 4

    ... Range Common-Mode Rejection Ratio CMRR Power-Supply Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing High V DD Output Voltage Swing Low V OL REFERENCE (MAX4037/MAX4039) Reference Voltage Temperature TCV Coefficient ΔV Line Regulation ΔV Load Regulation ΔI Capacitive-Load Stability Range C Note 1: Guaranteed by design. ...

  • Page 5

    ... MAX4036 SUPPLY CURRENT vs. SUPPLY VOLTAGE AND TEMPERATURE 1 +85° +25° 1.2 0 -40°C 0 1.4 1.8 2.2 2.6 3.0 3.4 SUPPLY VOLTAGE (V) MAX4039 SUPPLY CURRENT vs. SUPPLY VOLTAGE AND TEMPERATURE +85° +25° -40° 1.8 2.1 2.4 2.7 3.0 3.3 SUPPLY VOLTAGE (V) INPUT BIAS CURRENT vs. TEMPERATURE 40 ...

  • Page 6

    ... RESISTIVE LOAD (Ω vs. OUTPUT SWING LOW 140 120 100 100 200 300 V (mV) OL CROSSTALK vs. FREQUENCY 0 MAX4038/MAX4039 A = 1V/V V -20 -40 - 100kΩ L -80 -100 0.1 1k FREQUENCY (Hz) OP AMP SINK CURRENT vs. OUTPUT VOLTAGE -100mV ID 12 ...

  • Page 7

    Low I , +1.4V/800nA, Rail-to-Rail Op Amps BIAS ( AMP SOURCE CURRENT vs. OUTPUT VOLTAGE 3.0V DD ...

  • Page 8

    ... A -90 V -26 C -135 -30 1k 10k 100k 100 REFERENCE VOLTAGE CHANGE vs. TIME 1.234 1.233 MAX4037 1.232 MAX4039 1.231 1.230 85 0 100 200 300 400 TIME (HR) REFERENCE LINE-TRANSIENT RESPONSE 3. 1. -40° +25°C REF A AC-COUPLED 50mV/div = +85° ...

  • Page 9

    Low I , +1.4V/800nA, Rail-to-Rail Op Amps BIAS ( REFERENCE LOAD-TRANSIENT RESPONSE (SINKING CURRENT REF 2μA V REF 500mV/div 0 2.5ms/div ...

  • Page 10

    ... Rail-to-Rail Outputs The MAX4036–MAX4039 output stages can drive a 5kΩ load and still swing to within 40mV of the rails. Figure 1 shows the output voltage swing of the MAX4036– MAX4039 configured as a unity-gain buffer, powered from a single 2 ...

  • Page 11

    ... The MAX4037/MAX4039 reference requires no external capacitors. Although optimized for use as an operational amplifier, the MAX4036–MAX4039 can be used as a rail-to-rail forms a voltage- I/O comparator (Figures 3, 4). External hysteresis can be used to minimize the risk of output oscillation. The positive feedback circuit, shown in Figure 4, causes the input threshold to change when the output voltage changes state ...

  • Page 12

    ... To decrease stray capaci- tance, minimize trace lengths by placing external com- ponents close to the device. The exposed paddle (EP) on the TDFN packages of the MAX4038 and MAX4039 is internally connected to the device substrate Connect the exposed paddle leave EP unconnected ...

  • Page 13

    ... OUTB 3 Pin Configurations MAX4037 5 REF 2 4 IN- 3 SOT23 OUTB MAX4038 3 6 INB INB OUTB 2 9 INB MAX4039 INB REF MAX4039 V INA+ INB+ SS INA- REF INB- V OUTA OUTB UCSP 13 ...

  • Page 14

    ... Buffered Reference For the latest package outline information and land patterns 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 ...

  • Page 15

    ... Rail-to-Rail Op Amps BIAS For the latest package outline information and land patterns 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 ...

  • Page 16

    ... Buffered Reference For the latest package outline information and land patterns 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 ...

  • Page 17

    ... Rail-to-Rail Op Amps BIAS For the latest package outline information and land patterns 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 ...

  • Page 18

    ... Buffered Reference For the latest package outline information and land patterns 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 ...

  • Page 19

    ... Rail-to-Rail Op Amps BIAS For the latest package outline information and land patterns 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 ...

  • Page 20

    ... Buffered Reference For the latest package outline information and land patterns 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 ...

  • Page 21

    ... Rail-to-Rail Op Amps BIAS For the latest package outline information and land patterns 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 ...

  • Page 22

    ... Updated TOC 20 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. 22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © ...