MAX4038

Manufacturer Part NumberMAX4038
DescriptionThe single MAX4036/MAX4037 and dual MAX4038/MAX4039 operational amplifiers operate from a single +1
ManufacturerMaxim
MAX4038 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

MAX4038 Summary of contents

  • Page 1

    ... 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 ...

  • Page 2

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

  • Page 3

    ... LOAD LOAD e 0.1Hz to 10Hz n 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 ...

  • Page 4

    ... (MAX4036/MAX4038 only 1.8V, V ≤ V ≤ 3.3V, V ≤ V ≤ 1.4V ≤ V ≤ 3.6V DD (MAX4036/MAX4038 only) PSRR 1.8V ≤ V ≤ 3. 100kΩ, 50mV ≤ V ≤ OUT A VOL R = 5kΩ, 150mV ≤ V ≤ OUT R = 100kΩ 5kΩ ...

  • Page 5

    ... 1.4V DD 0.4 0 3.6 COMMON-MODE VOLTAGE (V) INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE +85° +25° 0.5 1.0 1.5 2.0 COMMON-MODE VOLTAGE (V) MAX4038 SUPPLY CURRENT vs. SUPPLY VOLTAGE AND TEMPERATURE 3 +85° +25°C 2 2.0 1.5 1 -40°C A 0.5 0 3.3 3.6 1.4 1.8 2.2 2.6 SUPPLY VOLTAGE (V) OFFSET VOLTAGE vs. TEMPERATURE 0.30 0.20 0.10 0 -0.10 -0 ...

  • 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

    Low I , +1.4V/800nA, Rail-to-Rail Op Amps BIAS with +1.2V Buffered Reference ( GAIN AND PHASE vs. FREQUENCY 80 70 GAIN 60 50 ...

  • 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

    ... Both MAX4038/MAX4038A available in µMAX package only. Detailed Description The MAX4036–MAX4039 consume an ultra-low supply current and have rail-to-rail output stages specifically designed for low-voltage operation. The input common- mode voltage range extends from V although full rail-to-rail input range is possible with degraded performance when operating from a supply voltage above 3 ...

  • Page 11

    ... BIAS Applications Information Power-Supply Considerations The MAX4036–MAX4039 operate from a single 1.4V (MAX4036/MAX4038) or 1.8V (MAX4037/MAX4039) to 3.6V supply. A high amplifier power-supply rejection ratio of 82dB and the excellent reference line regulation allow the devices to be powered directly from a decay- ing battery voltage, simplifying design and extending battery life. The MAX4036– ...

  • 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

    ... TDFN EXPOSED PAD CONNECTED TO V (BUMP SIDE DOWN) INB+ A INB 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 ...

  • 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 © ...