MAX4040ESA [ROCHESTER]
OP-AMP, 3500uV OFFSET-MAX, 0.09MHz BAND WIDTH, PDSO8, SOP-8;
| 型号： | MAX4040ESA |
| 厂家： | 
Rochester Electronics |
| 描述： | OP-AMP, 3500uV OFFSET-MAX, 0.09MHz BAND WIDTH, PDSO8, SOP-8 放大器 光电二极管 |
| 文件： | 总17页 (文件大小：1060K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1377; Rev 1; 9/05
Single/Dual/Quad, Low-Cost, SOT23,
Micropower Rail-to-Rail I/O Op Amps
________________General Description
____________________________Features
The MAX4040–MAX4044 family of micropower op amps
operates from a single +2.4V to +5.5V supply or dual
±±.2V to ±2.ꢀ5V supplies and haꢁe railꢂtoꢂrail input and
output capabilities. These amplifiers proꢁide a 90kHz
gainꢂbandwidth product while using only ±0µA of supply
current per amplifier. The MAX404±/MAX4043 haꢁe a
lowꢂpower shutdown mode that reduces supply current
to less than ±µA and forces the output into a highꢂimpedꢂ
ance state. The combination of lowꢂꢁoltage operation,
railꢂtoꢂrail inputs and outputs, and ultraꢂlow power conꢂ
sumption makes these deꢁices ideal for any
portable/batteryꢂpowered system.
♦ Single-Supply Operation Down to +2.4V
♦ Ultra-Low Power Consumption:
10µA Supply Current per Amplifier
1µA Shutdown Mode (MAX4041/MAX4043)
♦ Rail-to-Rail Input Common-Mode Range
♦ Outputs Swing Rail-to-Rail
♦ No Phase Reversal for Overdriven Inputs
♦ 200µV Input Offset Voltage
♦ Unity-Gain Stable for Capacitive Loads up to 200pF
♦ 90kHz Gain-Bandwidth Product
These amplifiers haꢁe outputs that typically swing to
within ±0mV of the rails with a ±00kΩ load. Railꢂtoꢂrail
input and output characteristics allow the full powerꢂ
supply ꢁoltage to be used for signal range. The combiꢂ
nation of low input offset ꢁoltage, low input bias current,
and high openꢂloop gain makes them suitable for lowꢂ
power/lowꢂꢁoltage precision applications.
♦ Available in Space-Saving 5-Pin SOT23 and
®
8-Pin µMAX Packages
Ordering Information
The MAX4040 is offered in a spaceꢂsaꢁing 5ꢂpin SOT23
package. All specifications are guaranteed oꢁer the
ꢂ40°C to +85°C extended temperature range.
PIN-
SOT
PART
TEMP RANGE
PACKAGE TOP MARK
MAX4040EUKꢂT ꢂ40°C to +85°C 5 SOT23ꢂ5
ACGF
—
MAX4040EUA
MAX4040ESA
MAX4041ESA
MAX404±EUA
MAX4042EUA
MAX4042ESA
MAX4043EUB
MAX4043ESD
MAX4044ESD
ꢂ40°C to +85°C 8 µMAX
ꢂ40°C to +85°C 8 SO
ꢂ40°C to +85°C 8 SO
ꢂ40°C to +85°C 8 µMAX
ꢂ40°C to +85°C 8 µMAX
ꢂ40°C to +85°C 8 SO
ꢂ40°C to +85°C ±0 µMAX
ꢂ40°C to +85°C ±4 SO
ꢂ40°C to +85°C ±4 SO
—
________________________Applications
—
BatteryꢂPowered
Systems
Strain Gauges
Sensor Amplifiers
Cellular Phones
Notebook Computers
PDAs
—
—
Portable/BatteryꢂPowered
Electronic Equipment
—
—
Digital Scales
—
—
Selector Guide
Pin Configurations
NO. OF
AMPS
TOP VIEW
PART
SHUTDOWN
PIN-PACKAGE
5ꢂpin SOT23,
8ꢂpin µMAX/SO
MAX4040
±
—
OUT
1
2
3
5
4
V
CC
MAX404±
MAX4042
±
2
Yes
—
8ꢂpin µMAX/SO
8ꢂpin µMAX/SO
MAX4040
V
EE
±0ꢂpin µMAX/
±4ꢂpin SO
MAX4043
MAX4044
2
4
Yes
—
IN+
IN-
±4ꢂpin SO
SOT23-5
Pin Configurations continued at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
1
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.
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
to V )..................................................+6V
±0ꢂPin µMAX (derate 5.6mW/°C aboꢁe +ꢀ0°C)...........444mW
±4ꢂPin SO (derate 8.33mW/°C aboꢁe +ꢀ0°C)..............66ꢀmW
Operating Temperature Range ...........................ꢂ40°C to +85°C
Junction Temperature......................................................+±50°C
Storage Temperature Range.............................ꢂ65°C to +±60°C
Lead Temperature (soldering, ±0s) .................................+300°C
CC
EE
All Other Pins ...................................(V
+ 0.3V) to (V ꢂ 0.3V)
CC
EE
Output ShortꢂCircuit Duration to V
or V ..............Continuous
CC
EE
Continuous Power Dissipation (T = +ꢀ0°C)
A
5ꢂPin SOT23 (derate ꢀ.±mW/°C aboꢁe +ꢀ0°C).............5ꢀ±mW
8ꢂPin µMAX (derate 4.±mW/°C aboꢁe +ꢀ0°C)..............330mW
8ꢂPin SO (derate 5.88mW/°C aboꢁe +ꢀ0°C).................4ꢀ±mW
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.
ELECTRICAL CHARACTERISTICS—T = +25°C
A
(V
CC
= +5.0V, V = 0V, V
EE
= 0V, V
= V
/ 2, SHDN = V , R = ±00kΩ tied to V
/ 2, unless otherwise noted.)
CM
OUT
CC
CC
L
CC
PARAMETER
SYMBOL
CONDITIONS
Inferred from PSRR test
MIN
TYP
MAX
UNITS
SupplyꢂVoltage Range
V
CC
2.4
5.5
V
V
V
= 2.4V
= 5.0V
±0
±4
CC
CC
Supply Current
per Amplifier
I
µA
µA
mV
CC
20
V
V
= 2.4V
= 5.0V
±.0
CC
Shutdown Supply
Current per Amplifier
SHDN = V , MAX404±
and MAX4043 only
EE
I
CC(SHDN)
2.0
5.0
±2.0
±2.5
±±.50
±±0
CC
MAX4044ESD
±0.20
±0.25
±0.20
±2
Input Offset Voltage
V
V
EE
≤ V
≤ V
CC
MAX404_EU_
OS
CM
All other packages
mV
nA
Input Bias Current
Input Offset Current
I
(Note ±)
(Note ±)
B
I
±0.5
45
±3.0
nA
OS
V
V
ꢂ V < ±.0V
MΩ
kΩ
IN+
IN+
INꢂ
Differential Input
Resistance
R
IN(DIFF)
ꢂ V > 2.5V
4.4
INꢂ
Input CommonꢂMode
Voltage Range
V
Inferred from the CMRR test
V
V
CC
V
CM
EE
MAX404_EU_
65
94
94
CommonꢂMode
Rejection Ratio
CMRR
PSRR
V
≤ V
≤ V
CC
dB
dB
dB
mV
mV
mA
dB
EE
CM
All other packages
ꢀ0
PowerꢂSupply
Rejection Ratio
2.4V ≤ V
≤ 5.5V
ꢀ5
85
CC
R = ±00kΩ
94
85
±0
60
±0
40
0.ꢀ
2.5
L
LargeꢂSignal
Voltage Gain
A
(V + 0.2V) ≤ V
≤ (V
ꢂ 0.2V)
CC
VOL
EE
OUT
R = 25kΩ
L
ꢀ4
R = ±00kΩ
L
Output Voltage
Swing High
V
OH
Specified as V
ꢂ V
OH
CC
R = 25kΩ
L
90
60
R = ±00kΩ
L
Output Voltage
Swing Low
V
OL
Specified as V ꢂ V
OL
EE
R = 25kΩ
L
Sourcing
Sinking
Output ShortꢂCircuit
Current
I
OUT(SC)
ChannelꢂtoꢂChannel
Isolation
Specified at DC, MAX4042/MAX4043/MAX4044 only
80
2
_______________________________________________________________________________________
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
ELECTRICAL CHARACTERISTICS—T = +25°C (continued)
A
(V
= +5.0V, V = 0V, V
EE
= 0V, V
= V
/ 2, SHDN = V , R = ±00kΩ tied to V
/ 2, unless otherwise noted.)
CC
CM
OUT
CC
CC
L
CC
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Output Leakage Current in
Shutdown
SHDN = V = 0, MAX404±/MAX4043 only
(Note 2)
EE
I
20
±00
nA
OUT(SHDN)
V
MAX404±/MAX4043 only
MAX404±/MAX4043 only
MAX404±/MAX4043 only
0.3 x V
V
V
SHDN Logic Low
IL
CC
V
IH
0.ꢀ x V
SHDN Logic High
CC
I
, I
IH IL
40
90
±20
nA
SHDN Input Bias Current
Gain Bandwidth Product
Phase Margin
GBW
kHz
degrees
dB
Φ
68
m
Gain Margin
G
±8
m
Slew Rate
SR
40
V/ms
nV/√Hz
pA/√Hz
pF
Input Voltage Noise Density
Input Current Noise Density
CapacitiꢁeꢂLoad Stability
PowerꢂUp Time
e
n
f = ±kHz
f = ±kHz
ꢀ0
i
n
0.05
200
200
50
A
= +±V/V, no sustained oscillations
VCL
t
µs
ON
Shutdown Time
t
MAX404± and MAX4043 only
MAX404± and MAX4043 only
µs
SHDN
Enable Time from Shutdown
Input Capacitance
Total Harmonic Distortion
Settling Time to 0.0±%
t
±50
3
µs
EN
C
IN
pF
THD
f
IN
= ±kHz, V
= 2Vpꢂp, A = +±V/V
0.05
50
%
OUT
V
t
S
A = +±V/V, V
V
= 2V
STEP
µs
OUT
ELECTRICAL CHARACTERISTICS—T = T
T
MAX
A
MIN
to
(V
= +5.0V, V = 0V, V
EE
= 0V, V
= V
/ 2, SHDN = V , R = ±00kΩ tied to V
/ 2, unless otherwise noted.) (Note 3)
CC
CM
OUT
CC
CC
L
CC
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SupplyꢂVoltage Range
V
CC
Inferred from PSRR test
2.4
5.5
V
Supply Current
per Amplifier
I
28
µA
µA
CC
Shutdown Supply
Current per Amplifier
I
6.0
SHDN = V , MAX404± and MAX4043 only
CC(SHDN)
EE
MAX4044ESA
±4.5
±5.0
±3.5
Input Offset Voltage
V
V
EE
≤ V
≤ V
CC
MAX404_EU_
mV
OS
CM
All other packages
Input Offset Voltage Drift
Input Bias Current
TC
2
µV/°C
nA
VOS
I
(Note ±)
(Note ±)
±20
±8
B
Input Offset Current
I
nA
OS
_______________________________________________________________________________________
3
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
ELECTRICAL CHARACTERISTICS—T = T
T
(continued)
MAX
A
MIN
to
(V
= +5.0V, V = 0V, V
EE
= 0V, V
= V
/ 2, SHDN = V , R = ±00kΩ tied to V
/ 2, unless otherwise noted.) (Note 3)
CC
CM
OUT
CC
CC
L
CC
PARAMETER
SYMBOL
CONDITIONS
Inferred from the CMRR test
MIN
TYP
MAX
UNITS
Input CommonꢂMode
Voltage Range
V
V
V
CC
V
CM
EE
MAX404_EU_
60
CommonꢂMode
Rejection Ratio
CMRR
PSRR
V
≤ V
≤ V
CC
dB
dB
dB
mV
mV
EE
CM
All other packages
65
PowerꢂSupply
Rejection Ratio
2.4V ≤ V
≤ 5.5V
ꢀ0
CC
LargeꢂSignal Voltage
Gain
A
(V + 0.2V) ≤ V
≤ (V
ꢂ 0.2V), R = 25kΩ
68
VOL
EE
OUT
CC
L
Output Voltage Swing
High
V
OH
Specified as V
ꢂ V , R = 25kΩ
±25
ꢀ5
L
CC
OH
Output Voltage Swing
Low
V
OL
Specified as V ꢂ V , R = 25kΩ
L
EE OL
Note 1: Input bias current and input offset current are tested with V
= +5.0V and +0.5V ≤ V
≤ +4.5V.
CM
CC
Note 2: Tested for V ≤ V
≤ V . Does not include current through external feedback network.
CC
EE
OUT
Note 3: All deꢁices are ±00% tested at T = +25°C. All temperature limits are guaranteed by design.
A
__________________________________________Typical Operating Characteristics
(V
CC
= +5.0V, V = 0, V
= V / 2, SHDN = V , R = ±00kΩ to V / 2, T = +25°C, unless otherwise noted.)
CM CC CC L CC A
EE
MAX4041/MAX4043
SHUTDOWN SUPPLY CURRENT
PER AMPLIFIER vs. TEMPERATURE
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
20
18
5
SHDN = 0
16
14
12
10
8
4
3
2
1
0
V
= +5.5V
CC
V
= +5.5V
= +2.4V
CC
V
CC
= +2.4V
6
V
CC
4
2
0
40
0
TEMPERATURE (°C)
0
-60 -40 -20
20
60 80 100
-60 -40 -20
20 40 60 80 100
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(V
CC
= +5.0V, V = 0, V
= V / 2, SHDN = V , R = ±00kΩ to V / 2, T = +25°C, unless otherwise noted.)
EE
CM
CC
CC
L
CC
A
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
INPUT BIAS CURRENT vs.
INPUT BIAS CURRENT
vs. TEMPERATURE
COMMON-MODE VOLTAGE (V = 2.4V)
CC
400
5.0
2.5
0
0
-1
-2
-3
-4
V
CC
= +2.4V
V
= 0
CM
V
= +2.4V
= +5.5V
CC
300
200
100
0
V
CC
-2.5
-5.0
40
TEMPERATURE (°C)
0.6
1.0
V
1.4
1.8
-60 -40 -20
0
20
60 80 100
0
0.2
2.2
40
-60 -40 -20
0
20
60 80 100
(V)
TEMPERATURE (°C)
CM
INPUT BIAS CURRENT vs.
COMMON-MODE VOLTAGE (V = 5.5V)
OUTPUT SWING HIGH
vs. TEMPERATURE
CC
5.0
120
100
80
V
= +5.5V
CC
R TO V
L
EE
2.5
0
V
CC
= +2.4V, R = 10kΩ
L
60
V
CC
= +5.5V, R = 20kΩ
L
40
-2.5
-5.0
V
= +5.5V, R = 100kΩ
L
CC
20
0
V
= +2.4V, R = 100kΩ
L
CC
1.5
2.5
V
3.5
5.5
0
0.5
4.5
40
0
TEMPERATURE (°C)
-60 -40 -20
20
60 80 100
(V)
CM
COMMON-MODE REJECTION
vs. TEMPERATURE
OUTPUT SWING LOW
vs. TEMPERATURE
-80
-85
120
100
80
R TO V
L
CC
V
= +2.4V
= +5.5V
CC
-90
60
V
= +5.5V, R = 20kΩ
L
CC
40
V
CC
V
CC
= +2.4V, R = 10kΩ
L
-95
V
= +5.5V, R = 100kΩ
L
CC
20
0
V
CC
= +2.4V, R = 100kΩ
L
-100
40
TEMPERATURE (°C)
-60 -40 -20
0
20
60 80 100
40
TEMPERATURE (°C)
-60 -40 -20
0
20
60 80 100
_______________________________________________________________________________________
5
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
____________________________________Typical Operating Characteristics (continued)
(V
CC
= +5.0V, V = 0, V
= V / 2, SHDN = V , R = ±00kΩ to V / 2, T = +25°C, unless otherwise noted.)
CM CC L CC A
EE
CC
OPEN-LOOP GAIN vs. OUTPUT SWING LOW
OPEN-LOOP GAIN vs. OUTPUT SWING HIGH
OPEN-LOOP GAIN vs. OUTPUT SWING LOW
(V = +5.5V, R TIED TO V
(V = +2.4V, R TIED TO V
)
CC
(V = +2.4V, R TIED TO V
)
EE
)
CC
CC
L
CC
L
CC
L
100
100
90
110
100
90
R = 100kΩ
L
90
80
R = 100kΩ
L
R = 100kΩ
L
80
R = 10kΩ
R = 20kΩ
L
L
R = 10kΩ
L
80
70
60
70
60
70
60
50
40
30
50
40
30
50
40
0
100
200
300
(mV)
400
500
0
100
200
∆V
300
400
500
0
100
200
(mV)
300
400
∆V
(mV)
∆V
OUT
OUT
OUT
OPEN-LOOP GAIN
vs. TEMPERATURE
OPEN-LOOP GAIN vs. OUTPUT SWING HIGH
(V = +5.5V, R TIED TO V
OPEN-LOOP GAIN
vs. TEMPERATURE
)
EE
CC
L
110
105
100
95
110
105
100
95
110
100
R = 100kΩ
L
V
= +5.5V, R TO V
L
CC
EE
V
CC
= +5.5V, R = 20kΩ TO V
EE
L
90
80
V
= +5.5V, R TO V
L CC
CC
R = 20kΩ
L
90
90
V
= +5.5V, R = 20kΩ TO V
L CC
CC
V
CC
= +2.4V, R TO V
L
EE
70
60
85
85
V
CC
= +2.4V, R TO V
CC
L
V
= +2.4V, R = 10kΩ TO V
L EE
CC
80
80
50
40
75
75
V
= +2.4V, R = 10kΩ TO V
L CC
CC
70
70
40
TEMPERATURE (°C)
-60 -40 -20
0
20
60 80 100
40
TEMPERATURE (°C)
0
100
200
300
400
-60 -40 -20
0
20
60 80 100
∆V
(mV)
OUT
GAIN AND PHASE vs. FREQUENCY
GAIN AND PHASE vs. FREQUENCY
(NO LOAD)
(C = 100pF)
L
MAX4040/44-16
MAX4040/44-17
60
180
60
180
A
= +1000V/V
V
A
V
= +1000V/V
50
40
30
20
144
108
50
40
144
108
72
36
30
20
72
36
10
0
0
10
0
0
-36
-72
-108
-144
-36
-72
-108
-144
-10
-20
-30
-10
-20
-30
-40
-40
-180
-180
10
100
1k
10k
100k
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
6
_______________________________________________________________________________________
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
____________________________________Typical Operating Characteristics (continued)
(V
CC
= +5.0V, V = 0, V
= V / 2, SHDN = V , R = ±00kΩ to V / 2, T = +25°C, unless otherwise noted.)
CM CC CC L CC A
EE
MAX4042/MAX4043/MAX4044
CROSSTALK vs. FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
-60
-70
1
R = 10kΩ
L
-80
0.1
-90
-100
-110
R = 100kΩ
L
R = 10kΩ
L
0.01
100
10
1k
10k
1
10
100
1000
FREQUENCY (Hz)
FREQUENCY (Hz)
SMALL-SIGNAL TRANSIENT RESPONSE
LOAD RESISTOR vs.
CAPACITIVE LOAD
(NONINVERTING)
MAX4040/44-21
1000
100
10
10%
OVERSHOOT
100mV
0V
IN
REGION OF
MARGINAL STABILITY
50mV/div
100mV
0V
OUT
REGION OF
STABLE OPERATION
10µs/div
0
250
500
(pF)
750
1000
C
LOAD
LARGE-SIGNAL TRANSIENT RESPONSE
SMALL-SIGNAL TRANSIENT RESPONSE
LARGE-SIGNAL TRANSIENT RESPONSE
(NONINVERTING)
(INVERTING)
(INVERTING)
MAX4040/42/44-23
MAX4040/44-22
MAX4040/42/44-24
4.5V
0.5V
4.5V
100mV
0V
+2V
-2V
+2V
-2V
IN
IN
IN
2V/div
OUT
50mV/div
OUT
2V/div
100mV
0V
OUT
0.5V
100µs/div
10µs/div
100µs/div
_______________________________________________________________________________________
7
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
______________________________________________________________Pin Description
PIN
MAX4040
MAX4043
NAME
FUNCTION
MAX4041 MAX4042
MAX4044
SOT23-5 SO/µMAX
µMAX
SO
Amplifier Output. High impedance
when in shutdown mode.
±
2
6
4
6
4
—
4
—
4
—
—
OUT
Negatiꢁe Supply. Tie to ground for
singleꢂsupply operation.
4
±±
V
EE
3
4
5
3
2
ꢀ
3
2
ꢀ
—
—
8
—
—
±0
—
—
±4
—
—
4
IN+
INꢂ
Noninꢁerting Input
Inꢁerting Input
V
CC
Positiꢁe Supply
5, ꢀ,
8, ±0
No Connection. Not internally conꢂ
nected.
—
±, 5, 8
±, 5
—
—
—
N.C.
Shutdown Input. Driꢁe high, or tie to
—
—
8
—
—
—
—
V for normal operation. Driꢁe to V
CC EE
SHDN
to place deꢁice in shutdown mode.
OUTA,
OUTB
Outputs for Amplifiers A and B. High
impedance when in shutdown mode.
—
—
—
—
—
—
—
—
—
±, ꢀ
2, 6
3, 5
±, 9
2, 8
3, ꢀ
±, ±3
2, ±2
3, ±±
±, ꢀ
2, 6
3, 5
INAꢂ,
INBꢂ
Inꢁerting Inputs to Amplifiers A and B
INA+,
INB+
Noninꢁerting Inputs to Amplifiers A
and B
Shutdown Inputs for Amplifiers A
SHDNA,
SHDNB
and B. Driꢁe high, or tie to V
for
CC
—
—
—
—
5, 6
6, 9
—
normal operation. Driꢁe to V to
EE
place deꢁice in shutdown mode.
Outputs for Amplifiers C and D
OUTC,
OUTD
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
8, ±4
9, ±3
INCꢂ,
INDꢂ
Inꢁerting Inputs to Amplifiers C and D
INC+,
IND+
Noninꢁerting Inputs to Amplifiers C
and D
±0, ±2
an excellent choice for precision or generalꢂpurpose,
lowꢂꢁoltage batteryꢂpowered systems.
_______________Detailed Description
Rail-to-Rail Input Stage
The MAX4040–MAX4044 haꢁe railꢂtoꢂrail inputs and
railꢂtoꢂrail output stages that are specifically designed
for lowꢂꢁoltage, singleꢂsupply operation. The input
stage consists of separate NPN and PNP differential
stages, which operate together to proꢁide a commonꢂ
mode range extending to both supply rails. The
crossoꢁer region of these two pairs occurs halfway
Since the input stage consists of NPN and PNP pairs,
the input bias current changes polarity as the commonꢂ
mode ꢁoltage passes through the crossoꢁer region.
Match the effectiꢁe impedance seen by each input to
reduce the offset error caused by input bias currents
flowing through external source impedances (Figures
±a and ±b). The combination of high source impedance
plus input capacitance (amplifier input capacitance
plus stray capacitance) creates a parasitic pole that
produces an underdamped signal response. Reducing
input capacitance or placing a small capacitor across
the feedback resistor improꢁes response in this case.
between V
and V . The input offset ꢁoltage is typiꢂ
EE
CC
cally 200µV. Low operating supply ꢁoltage, low supply
current, railꢂtoꢂrail commonꢂmode input range, and railꢂ
toꢂrail outputs make this family of operational amplifiers
8
_______________________________________________________________________________________
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
The MAX4040–MAX4044 family’s inputs are protected
from large differential input ꢁoltages by internal 2.2kΩ
series resistors and backꢂtoꢂback tripleꢂdiode stacks
across the inputs (Figure 2). For differential input ꢁoltꢂ
ages (much less than ±.8V), input resistance is typically
45MΩ. For differential input ꢁoltages greater than ±.8V,
input resistance is around 4.4kΩ, and the input bias
current can be approximated by the following equation:
MAX4040–
MAX4044
V
IN
R3
R1
R3 = R1 R2
I
= (V
ꢂ ±.8V) / 4.4kΩ
DIFF
BIAS
In the region where the differential input ꢁoltage
approaches ±.8V, the input resistance decreases expoꢂ
nentially from 45MΩ to 4.4kΩ as the diode block begins
conducting. Conꢁersely, the bias current increases with
the same curꢁe.
R2
Rail-to-Rail Output Stage
The MAX4040–MAX4044 output stage can driꢁe up to a
25kΩ load and still swing to within 60mV of the rails.
Figure 3 shows the output ꢁoltage swing of a MAX4040
configured as a unityꢂgain buffer, powered from a single
+4.0V supply ꢁoltage. The output for this setup typically
Figure 1a. Minimizing Offset Error Due to Input Bias Current
(Noninverting)
swings from (V + ±0mV) to (V
EE
ꢂ ±0mV) with a ±00kΩ
CC
MAX4040–
MAX4044
load.
Applications Information
R3
Power-Supply Considerations
The MAX4040–MAX4044 operate from a single +2.4V to
+5.5V supply (or dual ±±.2V to ±2.ꢀ5V supplies) and
consume only ±0µA of supply current per amplifier. A
high powerꢂsupply rejection ratio of 85dB allows the
amplifiers to be powered directly off a decaying battery
ꢁoltage, simplifying design and extending battery life.
R3 = R1 R2
V
IN
R1
R2
Power-Up Settling Time
The MAX4040–MAX4044 typically require 200µs to
power up after V
the output is indeterminant. The application circuit
should allow for this initial delay.
is stable. During this startꢂup time,
CC
Figure 1b. Minimizing Offset Error Due to Input Bias Current
(Inverting)
IN+
2.2kΩ
IN-
2.2kΩ
Figure 2. Input Protection Circuit
_______________________________________________________________________________________
9
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
MAX4040-44 fig04
MAX4040-44 fig03
V
= 2V
IN
R = 100kΩ TIED TO V
IN
L
V
EE
R = 100kΩ TIED TO V
L
= 4.0V
EE
f
= 1kHz
IN
SHDN
1V/div
OUT
5V/div
1V/div
OUT
1V/div
IN
200µs/div
200µs/div
Figure 3. Rail-to-Rail Input/Output Voltage Range
Figure 4. Shutdown Enable/Disable Output Voltage
Shutdown Mode
The MAX404± (single) and MAX4043 (dual) feature a
lowꢂpower shutdown mode. When the shutdown pin
(SHDN) is pulled low, the supply current drops to ±µA
per amplifier, the amplifier is disabled, and the outputs
enter a highꢂimpedance state. Pulling SHDN high or
leaꢁing it floating enables the amplifier. Take care to
ensure that parasitic leakage current at the SHDN pin
does not inadꢁertently place the part into shutdown
mode when SHDN is left floating. Figure 4 shows the
output ꢁoltage response to a shutdown pulse. The logic
1200
V
= 5.5V, V = 200mV
OH
CC
1000
800
600
400
200
V
CC
V
OH
= 2.4V,
= 200mV
V
CC
= 5.5V, V = 100mV
OH
V
CC
V
OH
= 2.4V,
= 100mV
V
CC
= 5.5V, V = 50mV
OH
threshold for SHDN is always referred to V
/ 2 (not to
CC
V
CC
= 2.4V, V = 50mV
OH
GND). When using dual supplies, pull SHDN to V to
EE
0
enter shutdown mode.
-60 -40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
Load-Driving Capability
The MAX4040–MAX4044 are fully guaranteed oꢁer temꢂ
perature and supply ꢁoltage to driꢁe a maximum resisꢂ
Figure 5a. Output Source Current vs. Temperature
tiꢁe load of 25kΩ to V
/ 2, although heaꢁier loads can
CC
be driꢁen in many applications. The railꢂtoꢂrail output
3000
stage of the amplifier can be modeled as a current
source when driꢁing the load toward V , and as a curꢂ
V
= 5.5V, V = 200mV
CC OL
CC
2500
2000
1500
1000
500
rent sink when driꢁing the load toward V . The magniꢂ
EE
V
= 2.4V, V = 200mV
OL
CC
tude of this current source/sink ꢁaries with supply
ꢁoltage, ambient temperature, and lotꢂtoꢂlot ꢁariations
of the units.
V
CC
V
OL
= 5.5V,
= 100mV
Figures 5a and 5b show the typical current source and
sink capability of the MAX4040–MAX4044 family as a
function of supply ꢁoltage and ambient temperature.
The contours on the graph depict the output current
ꢁalue, based on driꢁing the output ꢁoltage to within
50mV, ±00mV, and 200mV of either powerꢂsupply rail.
V
CC
= 2.4V, V = 100mV
OL
V
CC
= 5.5V, V = 50mV
OL
V
CC
= 2.4V, V = 50mV
OL
0
-60 -40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
Figure 5b. Output Sink Current vs. Temperature
10 ______________________________________________________________________________________
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
For example, a MAX4040 running from a single +2.4V
supply, operating at T = +25°C, can source 240µA to
A
within ±00mV of V
and is capable of driꢁing a 9.6kΩ
CC
:
load resistor to V
EE
R
ISO
2.4V ꢂ 0.±V
R
=
= 9.6kΩ to V
EE
L
240µA
R
L
C
L
The same application can driꢁe a 4.6kΩ load resistor
when terminated in V / 2 (+±.2V in this case).
MAX4040–
MAX4044
CC
Driving Capacitive Loads
The MAX4040–MAX4044 are unityꢂgain stable for loads
up to 200pF (see Load Resistor ꢁs. Capacitiꢁe Load
graph in Typical Operating Characteristics).
Applications that require greater capacitiꢁe driꢁe capaꢂ
bility should use an isolation resistor between the output
and the capacitiꢁe load (Figures 6a–6c). Note that this
alternatiꢁe results in a loss of gain accuracy because
R
L
A =
V
≈ 1
R + R
L
ISO
Figure 6a. Using a Resistor to Isolate a Capacitive Load from
the Op Amp
MAX4040/42/44 fig06b
R
forms a ꢁoltage diꢁider with the load resistor.
ISO
Power-Supply Bypassing and Layout
50mV/div
50mV/div
IN
The MAX4040–MAX4044 family operates from either a
single +2.4V to +5.5V supply or dual ±±.2V to ±2.ꢀ5V
supplies. For singleꢂsupply operation, bypass the
power supply with a ±00nF capacitor to V
(in this
EE
case GND). For dualꢂsupply operation, both the V
CC
and V supplies should be bypassed to ground with
EE
OUT
separate ±00nF capacitors.
Good PC board layout techniques optimize perforꢂ
mance by decreasing the amount of stray capacitance
at the op amp’s inputs and output. To decrease stray
capacitance, minimize trace lengths by placing exterꢂ
nal components as close as possible to the op amp.
Surfaceꢂmount components are an excellent choice.
100µs/div
R
ISO
= NONE, R = 100kΩ, C = 700pF
L
L
Figure 6b. Pulse Response without Isolating Resistor
Using the MAX4040–MAX4044
as Comparators
MAX4040/42/44 fig06c
Although optimized for use as operational amplifiers,
the MAX4040–MAX4044 can also be used as railꢂtoꢂrail
I/O comparators. Typical propagation delay depends
on the input oꢁerdriꢁe ꢁoltage, as shown in Figure ꢀ.
External hysteresis can be used to minimize the risk of
output oscillation. The positiꢁe feedback circuit, shown
in Figure 8, causes the input threshold to change when
the output ꢁoltage changes state. The two thresholds
create a hysteresis band that can be calculated by the
following equations:
50mV/div
50mV/div
IN
OUT
V
V
V
= V ꢂ V
HI LO
HYST
100µs/div
= V x R2 / (R± + (R± x R2 / R ) + R2)
HYST
LO
HI
IN
R
ISO
= 1kΩ, R = 100kΩ, C = 700pF
L
L
= [(R2 / R± x V ) + (R2 / R
) x V ] /
CC
IN
HYST
(± + R± / R2 + R2 / R
)
HYST
Figure 6c. Pulse Response with Isolating Resistor
______________________________________________________________________________________ 11
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
10,000
HYSTERESIS
V
V
HI
INPUT
V
OH
LO
t
+; V = +5V
CC
PD
1000
100
10
V
OH
t
-; V = +5V
CC
PD
OUTPUT
V
V
OL
t
+; V = +2.4V
CC
PD
IN
R
HYST
t
-; V = +2.4V
CC
PD
R1
R2
V
CC
0
10 20 30 40 50 60 70 80 90 100
(mV)
V
OUT
V
OD
MAX4040–
MAX4044
V
EE
Figure 7. Propagation Delay vs. Input Overdrive
V
The MAX4040–MAX4044 contain special circuitry to
boost internal driꢁe currents to the amplifier output
stage. This maximizes the output ꢁoltage range oꢁer
which the amplifiers are linear. In an openꢂloop comꢂ
parator application, the excursion of the output ꢁoltage
is so close to the supply rails that the output stage tranꢂ
sistors will saturate, causing the quiescent current to
increase from the normal ±0µA. Typical quiescent curꢂ
EE
Figure 8. Hysteresis Comparator Circuit
I
LOAD
rents increase to 35µA for the output saturating at V
CC
R1
and 28µA for the output at V
.
EE
V
CC
Using the MAX4040–MAX4044
as Ultra-Low-Power Current Monitors
The MAX4040–MAX4044 are ideal for applications powꢂ
ered from a battery stack. Figure 9 shows an application
circuit in which the MAX4040 is used for monitoring the
current of a battery stack. In this circuit, a current load is
applied, and the ꢁoltage drop at the battery terminal is
sensed.
R2
Q1
V
OUT
The ꢁoltage on the load side of the battery stack is
equal to the ꢁoltage at the emitter of Q±, due to the
feedback loop containing the op amp. As the load curꢂ
rent increases, the ꢁoltage drop across R± and R2
increases. Thus, R2 proꢁides a fraction of the load curꢂ
rent (set by the ratio of R± and R2) that flows into the
emitter of the PNP transistor. Neglecting PNP base curꢂ
rent, this current flows into R3, producing a groundꢂrefꢂ
erenced ꢁoltage proportional to the load current. Scale
R± to giꢁe a ꢁoltage drop large enough in comparison
R3
MAX4040
V
EE
Figure 9. Current Monitor for a Battery Stack
to V of the op amp, in order to minimize errors.
OS
For a ±V output and a current load of 50mA, the choice
of resistors can be R± = 2Ω, R2 = ±00kΩ, R3 = ±MΩ.
The circuit consumes less power (but is more susceptiꢂ
ble to noise) with higher ꢁalues of R±, R2, and R3.
The output ꢁoltage of the application can be calculated
using the following equation:
V
= [I
x (R± / R2)] x R3
LOAD
OUT
12 ______________________________________________________________________________________
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
_____________________________________________Pin Configurations (continued)
TOP VIEW
N.C.
IN-
1
2
3
4
8
7
6
5
N.C.
OUTA
INA-
1
2
3
4
8
7
6
5
V
CC
N.C.
IN-
1
2
3
4
8
7
6
5
SHDN
VCC
OUT
V
OUTB
INB-
CC
MAX4040
MAX4042
MAX4041
IN+
OUT
N.C.
INA+
IN+
V
EE
V
INB+
V
N.C.
EE
EE
SO/µMAX
SO/µMAX
SO/µMAX
OUTA
INA-
1
14
V
OUTA
INA-
1
2
3
4
5
6
7
14 OUTD
13 IND-
12 IND+
CC
OUTA
INA-
1
10
9
V
CC
2
3
4
5
6
7
13 OUTB
12 INB-
11 INB+
10 N.C.
2
3
4
5
OUTB
MAX4043
INA+
INA+
INA+
8
INB-
V
MAX4043
V
CC
11
V
EE
MAX4044
V
7
INB+
EE
EE
N.C.
SHDNA
N.C.
INB+
INB-
10 INC+
SHDNA
6
SHDNB
9
8
SHDNB
N.C.
9
8
INC-
µMAX
OUTB
OUTC
SO
SO
___________________Chip Information
MAX4040/MAX404± TRANSISTOR COUNT: 234
MAX4042/MAX4043 TRANSISTOR COUNT: 466
MAX4044 TRANSISTOR COUNT: 932
SUBSTRATE CONNECTED TO V
EE
______________________________________________________________________________________ 13
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, SOT-23, 5L
1
21-0057
E
1
14 ______________________________________________________________________________________
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
4X S
8
8
MILLIMETERS
INCHES
DIM MIN
MAX
MAX
MIN
-
-
0.043
0.006
0.037
0.014
0.007
0.120
1.10
0.15
0.95
0.36
0.18
3.05
A
0.002
0.030
0.010
0.005
0.116
0.05
0.75
0.25
0.13
2.95
A1
A2
b
E
H
Ø0.50 0.1
c
D
e
0.0256 BSC
0.65 BSC
0.6 0.1
E
H
0.116
0.188
0.016
0∞
0.120
2.95
4.78
0.41
0∞
3.05
5.03
0.66
6∞
0.198
0.026
6∞
L
1
1
α
S
0.6 0.1
0.0207 BSC
0.5250 BSC
BOTTOM VIEW
D
TOP VIEW
A1
A2
A
c
α
e
L
b
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0036
J
1
______________________________________________________________________________________ 15
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
e
4X S
10
10
INCHES
MAX
MILLIMETERS
MAX
1.10
0.15
0.95
3.05
3.00
3.05
3.00
5.05
0.70
DIM MIN
MIN
-
A
-
0.043
0.006
0.037
0.120
0.118
0.120
0.118
0.199
A1
A2
D1
D2
E1
E2
H
0.002
0.030
0.116
0.114
0.116
0.114
0.187
0.05
0.75
2.95
2.89
2.95
2.89
4.75
0.40
H
Ø0.50 0.1
0.6 0.1
L
0.0157 0.0275
0.037 REF
L1
b
0.940 REF
0.007
0.0106
0.177
0.270
0.200
1
1
e
0.0197 BSC
0.500 BSC
0.6 0.1
c
0.0035 0.0078
0.0196 REF
0.090
BOTTOM VIEW
0.498 REF
S
α
TOP VIEW
0°
6°
0°
6°
D2
E2
GAGE PLANE
A2
c
A
E1
b
L
α
A1
D1
L1
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 10L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0061
I
1
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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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