Rainbow Electronics MAX4039 User 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 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 singlecell 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 temperature 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
PINPACKAGE
TOP
MARK
MAX4036EXK-T*
5 SC70-5
AFR
MAX4037EUT-T
6 SOT23-6
ABRX
MAX4038ETA
AGO
MAX4038EUA
8 µMAX —
MAX4039ETB*
AAN
MAX4039EUB
10 µMAX —
Pin Configurations and Selector Guide appear at end of
data sheet.
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C 8 TDFN-EP**
-40°C to +85°C
-40°C to +85°C 10 TDFN-EP**
-40°C to +85°C
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
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 ...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
CONDITIONS
UNITS
MAX4036/MAX4038, guaranteed by PSRR
tests
1.4 3.6
Supply Voltage Range V
DD
MAX4037/MAX4039, guaranteed by PSRR
and line regulation tests
1.8 3.6
V
VDD = 1.4V 0.8 1.2
MAX4036
V
DD
= 3.6V 0.9 1.3
VDD = 1.8V 1.9 2.4
MAX4037
V
DD
= 3.6V 2.0 2.5
VDD = 1.4V 1.7 2.3
MAX4038
V
DD
= 3.6V 1.9 2.5
VDD = 1.8V 2.8 4.0
Supply Current I
DD
MAX4039
V
DD
= 3.6V 3.0 4.1
µA
OPERATIONAL AMPLIFIERS
Input Offset Voltage V
OS
mV
Input Bias Current I
B
(Note 1)
±10 pA
Input Offset Current I
OS
(Note 1)
±20 pA
V
D D
= 1.4V
VDD -
0.4
VDD = 1.8V
VDD -
0.3
Input Common-Mode Voltage
Range
V
CM
Guaranteed by
CMRR test
V
DD
= 3.3V
VDD -
0.2
V
VDD = 1.4V, VSS † VCM † (VDD - 0.4V)
(MAX4036/MAX4038 only)
50 70
VDD = 1.8V, VSS † VCM † (VDD - 0.3V) 50 70
Common-Mode Rejection Ratio CMRR
V
DD
= 3.3V, VSS † VCM † (VDD - 0.2V) 56 76
dB
1.4V † VDD † 3.6V (MAX4036/MAX4038
only)
62 82
Power-Supply Rejection Ratio PSRR
1.8V † V
DD
† 3.6V 62 84
dB
SYMBOL
MIN TYP MAX
( M AX 4036/M AX 4038 onl y)
V
SS
V
SS
V
SS
±0.2 ±2.0
±1.0
±0.3
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.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
80 108
Large-Signal Voltage Gain A
VOL
78 105
dB
RL = 100kΩ 25
Output Voltage Swing High
RL = 5kΩ 25 50
mV
RL = 100kΩ 25
Output Voltage Swing Low
RL = 5kΩ 25 50
mV
Output Short-Circuit Current I
SCO
To VDD or V
SS
mA
Gain-Bandwidth Product GBW 4 kHz
Phase Margin θ
M
90
Degrees
Slew Rate SR 0.4
V/ms
Power-On Time t
ON
(Note 3)
ms
Input Noise-Voltage Density e
n
f = 1kHz 500
nV/√Hz
Capacitive-Load Stability C
LOADAVCL
= 1V/V, no sustained oscillations
pF
REFERENCE (MAX4037/MAX4039)
Reference Voltage V
REF
V
Line Regulation
∆V
REF
/
∆V
DD
VDD = +1.8V to +3.6V 0.3 %/V
0 † I
LOAD
† 100µA, sourcing
Load Regulation
∆V
REF
/
∆I
LOAD -20µA † I
LOAD
† 0, sinking
%/µA
Reference Output Voltage Noise
e
n
0.1Hz to 10Hz 60
µV
P-P
Short to V
DD
Output Short-Circuit Current I
SCR
Short to V
SS
1.9
mA
Capacitive-Load Stability Range
C
LOAD
(Note 1) 0 250 pF
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
MAX4036/MAX4038, guaranteed by PSRR
test
1.4 3.6
Supply Voltage Range V
DD
MAX4037/MAX4039, guaranteed by PSRR
and line regulation tests
1.8 3.6
V
VDD = 1.4V 1.7
MAX4036
V
DD
= 3.6V 1.8
VDD = 1.8V 3.1
MAX4037
V
DD
= 3.6V 3.2
VDD = 1.4V 2.9
MAX4038
V
DD
= 3.6V 3.2
VDD = 1.8V 5.2
Supply Current I
DD
MAX4039
V
DD
= 3.6V 5.3
µA
RL = 100kΩ, 50mV † V
RL = 5kΩ, 150mV † V
VDD - V
OH
VOL - V
SS
† (VDD - 50mV)
OUT
† (VDD - 150mV)
OUT
±13
0.25
5000
1.226 1.232 1.238
0.0015
0.0075
0.25
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)
PARAMETER
CONDITIONS
UNITS
OPERATIONAL AMPLIFIERS
Input Offset Voltage V
OS
±8 mV
Input Offset Voltage Temperature
Coefficient
TCV
OS
±1
µV/°C
Input Bias Current I
B
pA
Input Offset Current I
OS
pA
VDD = 1.4V
VDD -
0.4
VDD = 1.8V
VDD -
0.4
Input Common-Mode Voltage
Range
V
CM
Guaranteed by
CMRR test
V
DD
= 3.3V
VDD -
0.2
V
VDD = 1.4V, VSS ≤ VCM ≤ (VDD - 0.4V)
(MAX4036/MAX4038 only)
44
VDD = 1.8V, VSS ≤ VCM ≤ (VDD - 0.4V) 50
Common-Mode Rejection Ratio CMRR
V
DD
= 3.3V, VSS ≤ VCM ≤ (VDD - 0.2V) 52
dB
1.4V ≤ VDD ≤ 3.6V
(MAX4036/MAX4038 only)
60
Power-Supply Rejection Ratio PSRR
1.8V ≤ V
DD
≤ 3.6V 60
dB
RL = 100kΩ, 50mV ≤ V
OUT
≤ (VDD - 50mV) 75
Large-Signal Voltage Gain A
VOL
RL = 5kΩ, 150mV ≤ V
OUT
≤ (VDD - 150mV) 73
dB
RL = 100kΩ 10
Output Voltage Swing High
RL = 5kΩ
mV
RL = 100kΩ 10
Output Voltage Swing Low
RL = 5kΩ
mV
REFERENCE (MAX4037/MAX4039)
Reference Voltage Temperature
Coefficient
(Note 1) 20 80
ppm/°C
Line Regulation
∆V
REF
/
∆V
DD
VDD = 1.8V to 3.6V 0.6 %/V
0 ≤ I
LOAD
≤ 100µA, sourcing
Load Regulation
∆V
REF
/
-20µA ≤ I
LOAD
≤ 0, sinking
%/µA
Capacitive-Load Stability Range
C
LOAD
(Note 1) 0
pF
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 _______________________________________________________________________________________
SYMBOL
V
- V
DD
OH
VOL - V
SS
TCV
REF
∆I
LOAD
(MAX4036/MAX4038 only)
MIN TYP MAX
V
SS
V
SS
V
SS
±100
±200
100
100
0.003
0.015
250
MAX4036–MAX4039
Low I
BIAS
, +1.4V/800nA, Rail-to-Rail Op Amps
with +1.2V Buffered Reference
_______________________________________________________________________________________ 5
MAX4036
SUPPLY CURRENT
vs. SUPPLY VOLTAGE AND TEMPERATURE
MAX4036 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
3.02.62.21.8
0.4
0.8
1.2
1.6
0
1.4 3.4
TA = +85°C
TA = -40°C
TA = +25°C
MAX4037
SUPPLY CURRENT
vs. SUPPLY VOLTAGE AND TEMPERATURE
MAX4036 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
3.33.02.72.42.1
0.5
1.0
1.5
2.0
2.5
3.0
0
1.8 3.6
TA = +85°C
TA = -40°C
TA = +25°C
MAX4038
SUPPLY CURRENT
vs. SUPPLY VOLTAGE AND TEMPERATURE
MAX4036 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
3.02.62.21.8
0.5
1.5
1.0
2.0
2.5
3.0
0
1.4 3.4
TA = +85°C
TA = -40°C
TA = +25°C
MAX4039
SUPPLY CURRENT
vs. SUPPLY VOLTAGE AND TEMPERATURE
MAX4036 toc04
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
3.33.02.72.42.1
1
2
4
3
5
0
1.8 3.6
TA = +85°C
TA = -40°C
TA = +25°C
OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX4036 toc05
COMMON-MODE VOLTAGE (V)
OFFSET VOLTAGE (mV)
21
0.2
0.4
0.6
0.8
1.0
0
03
VDD = 1.4V
VDD = 1.8V
VDD = 3.0V
OFFSET VOLTAGE
vs. TEMPERATURE
MAX4036 toc06
TEMPERATURE (°C)
OFFSET VOLTAGE (mV)
603510-15
-0.20
-0.10
0
0.10
0.20
0.30
-0.30
-40 85
INPUT BIAS CURRENT
vs. TEMPERATURE
MAX4036 toc07
TEMPERATURE (°C)
INPUT BIAS CURRENT (pA)
603510-15
0
10
20
30
40
-10
-40 85
VCM = 3V
VCM = 0V
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
MAX4036 toc08
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT (pA)
2.52.01.51.00.5
10
20
30
40
0
03.0
TA = +25°C
TA = +85°C
-10
-100
10 10k1k100
OP AMP POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-70
-90
-30
-50
0
-60
-80
-20
-40
MAX4036 toc09
FREQUENCY (Hz)
PSRR (dB)
AV = 1V/V
Typical Operating Characteristics
(VDD= 3V, VSS= VCM= 0V, RLto VDD/2, TA= +25°C, unless otherwise noted.)
MAX4036–MAX4039
Low I
BIAS
, +1.4V/800nA, Rail-to-Rail Op Amps
with +1.2V Buffered Reference
6 _______________________________________________________________________________________
OUTPUT VOLTAGE SWING HIGH
vs. TEMPERATURE
MAX4036 toc10
TEMPERATURE (°C)
V
DD
- V
OH
(mV)
603510-15
5
10
15
20
25
30
0
-40 85
RL = 5k
Ω
RL = 100k
Ω
OUTPUT VOLTAGE SWING LOW
vs. TEMPERATURE
MAX4036 toc11
TEMPERATURE (°C)
V
OL
- V
SS
(mV)
603510-15
5
10
15
20
25
30
35
0
-40 85
RL = 100k
Ω
RL = 5k
Ω
AV
vs. OUTPUT SWING LOW
MAX4036 toc12
VOL (mV)
A
V
(dB)
400300100 200
60
80
100
120
140
40
0 500
RL = 5k
Ω
RL = 100k
Ω
AV
vs. OUTPUT SWING HIGH
MAX4036 toc13
VDD - VOH (mV)
A
V
(dB)
400300100 200
60
80
100
120
140
40
0 500
RL = 5k
Ω
RL = 100k
Ω
AV
vs. TEMPERATURE
MAX4036 toc14
TEMPERATURE (°C)
A
VOL
(dB)
603510-15
20
40
60
80
100
120
140
0
-40 85
RL = 100k
Ω
RL = 5k
Ω
0
-100
00.1 10k 100k
CROSSTALK
vs. FREQUENCY
-60
-80
-40
-20
MAX4036 toc15
FREQUENCY (Hz)
CROSSTALK (dB)
1k
RL = 5k
Ω
RL = 100k
Ω
AV = 1V/V
MAX4038/MAX4039
100
0.01
0.01 0.1 10 100
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
0.1
1
10
MAX4036 toc16
FREQUENCY (kHz)
THD+N (%)
1
AV = 1V/V
V
IN_
= VDD/2
V
OUT
= 2.5V
P-P
RL = 100kΩ TO V
SS
V
OUT
= 2.5V
P-P
RL = 5kΩ TO V
SS
100,000
100
10k 100k 1M
OP AMP STABILITY
vs. CAPACITIVE AND RESISTIVE LOADS
MAX4036 toc17
RESISTIVE LOAD (Ω)
CAPACITIVE LOAD (pF)
1000
10,000
STABLE
REGION
RL TO V
SS
UNSTABLE
REGION
OP AMP SINK CURRENT
vs. OUTPUT VOLTAGE
MAX4036 toc18
V
OUT_
(V)
SINK CURRENT (mA)
2.41.81.20.6
2
4
6
8
10
12
14
0
03.0
VDD = 3.0V
VDD = 1.8V
VID = -100mV
Typical Operating Characteristics (continued)
(VDD= 3V, VSS= VCM= 0V, RLto VDD/2, TA= +25°C, unless otherwise noted.)
Loading...