Rainbow Electronics MAX4039 - Manual

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
DD - 0.4V at V DD = 1.4V.
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 µMAX and TDFN packages. All devices
are specified over the -40°C to +85°C extended tem-
perature range.
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%, 80ppm/°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 SC70, SOT23, TDFN, and µMAX
Packages
MAX4036–MAX4039
Low I
BIAS
, +1.4V/800nA, Rail-to-Rail Op Amps
with +1.2V Buffered Reference
________________________________________________________________ Maxim Integrated Products 1
INA+ SENSOR
REF
THREE-ELECTRODE POTENTIOSTAT APPLICATION
INB+
OUTA
INB-
OUTB
INA-
V DD
V SS
MAX4039
3V
ADC
Typical Operating Circuit
Ordering Information
MAX4039
OUTA
REF
INA-
INA+
V SS
OUTB
INB-
INB+
V DD
REF
Functional Diagram
19-3142; Rev 0; 1/04
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
*Future product—contact factory for availability.
**EP = Exposed paddle.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
PART TEMP RANGE
PIN-
PACKAGE TOP
MARK
MAX4036 EXK-T* -40°C to +85°C 5 SC70-5 AFR
MAX4037 EUT-T -40°C to +85°C 6 SOT23-6 ABRX
MAX4038 ETA -40°C to +85°C 8 TDFN-EP** AGO
MAX4038EUA -40°C to +85°C 8 µMAX —
MAX4039 ETB* -40°C to +85°C 10 TDFN-EP** AAN
MAX4039EUB -40°C to +85°C 10 µMAX —
Pin Configurations and Selector Guide appear at end of
data sheet.