MAX4242EUA+T [MAXIM]
Operational Amplifier, 2 Func, 2000uV Offset-Max, BIPolar, PDSO8, 3 X 3 MM, ROHS COMPLIANT, MICRO, SOP-8;
| 型号： | MAX4242EUA+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Operational Amplifier, 2 Func, 2000uV Offset-Max, BIPolar, PDSO8, 3 X 3 MM, ROHS COMPLIANT, MICRO, SOP-8 放大器 光电二极管 |
| 文件： | 总16页 (文件大小：829K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1343; Rev 3; 9/06
Single/Dual/Quad, +1.8V/10µA, SOT23,
Beyond-the-Rails Op Amps
General Description
Features
The MAX4240–MAX4244 family of micropower op amps
operate from a single +1.8V to +5.5V supply or dual
0.ꢀV to 2.ꢁ5V supplies and haꢂe ꢃeyondꢄtheꢄꢅailsꢆ
inputs and railꢄtoꢄrail output capabilities. These ampliꢄ
fiers proꢂide a ꢀ0kHz gainꢄbandwidth product while
using only 10µA of supply current per amplifier. The
MAX4241/MAX4243 haꢂe a lowꢄpower shutdown mode
that reduces supply current to less than 1µA and forces
the output into a highꢄimpedance state. Although the
minimum operating ꢂoltage is specified at +1.8V, these
deꢂices typically operate down to +1.5V. The combinaꢄ
tion of ultraꢄlowꢄꢂoltage operation, beyondꢄtheꢄrails
inputs, railꢄtoꢄrail outputs, and ultraꢄlow power conꢄ
sumption makes these deꢂices ideal for any portable/
twoꢄcell batteryꢄpowered system.
♦ Ultra-Low-Voltage Operation:
Guaranteed Down to +1.8V
Typical Operation to +1.5V
♦ Ultra-Low Power Consumption:
10µA Supply Current per Amplifier
1µA Shutdown Mode (MAX4241/MAX4243)
Up to 200,000 Hours Operation from Two AA
Alkaline Cells
♦ Beyond-the-Rails Input Common-Mode Range
♦ Outputs Swing Rail-to-Rail
♦ No Phase Reversal for Overdriven Inputs
♦ 200µV Input Offset Voltage
These amplifiers haꢂe an input commonꢄmode range
that extends 200mV beyond each rail, and their outꢄ
puts typically swing to within ꢀmV of the rails with a
100kΩ load. ꢃeyondꢄtheꢄrails input and railꢄtoꢄrail outꢄ
put characteristics allow the full powerꢄsupply ꢂoltage
to be used for signal range. The combination of low
input offset ꢂoltage, low input bias current, and high
openꢄloop gain makes them suitable for lowꢄpower/lowꢄ
ꢂoltage precision applications.
♦ Unity-Gain Stable for Capacitive Loads up to 200pF
♦ 90kHz Gain-Bandwidth Product
♦ Available in Space-Saving 5-Pin SOT23 and
8-Pin µMAX® Packages
Ordering Information
PIN-
PACKAGE
TOP
MARK
PART
TEMP RANGE
The MAX4240 is offered in a spaceꢄsaꢂing 5ꢄpin
SOT23 package. All specifications are guaranteed
oꢂer the ꢄ40°C to +85°C extended temperature range.
MAX4240EUKꢄT ꢄ40°C to +85°C 5 SOT23ꢄ5
ACCS
—
MAX4241EUA
MAX4241ESA
MAX4242EUA
MAX4242ESA
MAX4243EUꢃ
MAX4243ESD
MAX4244ESD
ꢄ40°C to +85°C 8 µMAX
ꢄ40°C to +85°C 8 SO
ꢄ40°C to +85°C 8 µMAX
ꢄ40°C to +85°C 8 SO
ꢄ40°C to +85°C 10 µMAX
ꢄ40°C to +85°C 14 SO
ꢄ40°C to +85°C 14 SO
—
Applications
—
TwoꢄCell ꢃatteryꢄ
Powered Systems
Strain Gauges
Sensor Amplifiers
Cellular Phones
Notebook Computers
PDAs
—
—
Portable/ꢃatteryꢄPowered
Electronic Equipment
—
—
Digital Scales
Pin Configurations
Selector Guide
TOP VIEW
NO. OF
AMPS
PART
SHUTDOWN
PIN-PACKAGE
MAX4240
MAX4241
MAX4242
1
1
2
—
5ꢄpin SOT23
OUT
1
2
3
5
4
V
CC
Yes
—
8ꢄpin µMAX/SO
8ꢄpin µMAX/SO
MAX4240
V
EE
10ꢄpin µMAX,
14ꢄpin SO
MAX4243
2
Yes
IN+
IN-
MAX4244
4
—
14ꢄpin SO
Beyond-the-Rails is a trademark and µMAX is a registered
trademark of Maxim Integrated Products, Inc.
SOT23-5
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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.
S in g le /Du a l/Qu a d , +1 .8 V/1 0 µA, S OT2 3 ,
Be yo n d -t h e -Ra ils Op Am p s
ABSOLUTE MAXIMUM RATINGS
4
Supply Voltage (V
All Other Pins ...................................(V
Output Short-Circuit Duration (to V
Continuous Power Dissipation (T = +70°C)
5-pin SOT23 (derate 7.1mW/°C above +70°C).............571mW
8-pin µMAX (derate 4.1mW/°C above +70°C) ..............330mW
8-pin SO (derate 5.88mW/°C above +70°C).................471mW
to V )....................................................6V
10-pin µMAX (derate 5.6mW/°C above +70°C) ............444mW
14-pin SO (derate 8.33mW/°C above +70°C)...............667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
EE
+ 0.3V) to (V - 0.3V)
CC
EE
or V )............Continuous
CC
EE
A
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
(V
= +1.8V to +5.5V, V
= 0, V
= 0, V
= V
/ 2, R = 100kΩ tied to V
/ 2, SHDN = V , T = +25°C, unless
CC CC A
CC
EE
CM
OUT
CC
L
otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
12
UNITS
Supply-Voltage Range
V
CC
Inferred from PSRR test
1.8
V
V
V
V
V
= 1.8V
= 5.0V
= 1.8V
= 5.0V
10
CC
CC
CC
CC
Supply Current
per Amplifier
I
µA
µA
SHDN= V
CC
CC
0–MAX24
14
18
1.0
2.0
0.20
1.5
3.0
0.75
Shutdown Supply
Current (Note 2)
I
SHDN= V
CC(SHDN)
EE
MAX4241ESA
MAX4242ESA/MAX4243ESD/
MAX4244ESD
0.20
0.25
0.88
1.40
(V - 0.2V) ≤ V
≤
CM
EE
Input Offset Voltage
V
mV
OS
(V
+ 0.2V)
CC
MAX4240EUK/MAX424_EUA/
MAX4243EUB
Input Bias Current
Input Offset Current
I
(Note 3)
(Note 3)
2
0.5
45
6
nA
nA
B
I
1.5
OS
V
IN+
IN+
- V
< 1.0V
> 2.5V
MΩ
kΩ
IN-
Differential Input
Resistance
R
IN(DIFF)
V
- V
4.4
IN-
Input Common-Mode
Voltage Range
V
Inferred from the CMRR test
V
- 0.2
V + 0.2
CC
V
CM
EE
MAX4241ESA
72
69
90
90
MAX4242ESA/MAX4243ESD/
MAX4244ESD
V
V
= 1.8V
= 5.0V
CC
CC
MAX4240EUK/MAX424_EUA/
MAX4243EUB
63
74
74
88
94
94
Common-Mode
Rejection Ratio
(Note 4)
CMRR
dB
MAX4241ESA
MAX4242ESA/MAX4243ESD/
MAX4244ESD
MAX4240EUK/MAX424_EUA/
MAX4243EUB
69
90
2
_______________________________________________________________________________________
S in g le /Du a l/Qu a d , +1 .8 V/1 0 µA, S OT2 3 ,
Be yo n d -t h e -Ra ils Op Am p s
0–MAX24
ELECTRICAL CHARACTERISTICS (continued)
(V
= +1.8V to +5.5V, V
= 0, V
= 0, V
= V
/ 2, R = 100kΩ tied to V
/ 2, SHDN = V , T = +25°C, unless
CC CC A
CC
EE
CM
OUT
CC
L
otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MAX4241ESA
MIN
TYP
MAX
UNITS
77
85
MAX4242ESA/MAX4243ESD/
MAX4244ESD
77
75
85
82
Power-Supply
Rejection Ratio
PSRR
1.8V ≤ V
≤ 5.5V
dB
CC
MAX4240EUK/MAX424_EUA/
MAX4243EUB
R = 100kΩ
76
66
86
78
85
73
94
85
8
L
V
= 1.8V
= 5.0V
= 1.8V
= 5.0V
= 1.8V
= 5.0V
CC
R = 10kΩ
L
Large-Signal
Voltage Gain
(V + 0.2V) ≤ V
≤
EE
OUT
A
dB
mV
mV
VOL
(V
CC
- 0.2V)
R = 100kΩ
L
V
CC
R = 10kΩ
L
R = 100kΩ
L
20
65
25
95
15
35
20
60
V
CC
R = 10kΩ
L
40
10
60
6
Output Voltage
Swing High
Specified as
- V
V
OH
4
V
CC
OH
R = 100kΩ
L
V
CC
R = 10kΩ
L
R = 100kΩ
L
V
CC
R = 10kΩ
L
23
10
40
0.7
2.5
Output Voltage
Swing Low
Specified as
- V
V
OL
V
EE
OL
R = 100kΩ
L
V
CC
R = 10kΩ
L
Sourcing
Sinking
Output Short-Circuit
Current
I
mA
nA
OUT(SC)
Output Leakage
Current in Shutdown
(Notes 2, 5)
I
20
50
SHDN= V = 0, V
= 5.5V
OUT(SHDN)
EE
CC
SHDNLogic Low
(Note 2)
V
0.3 x V
V
V
IL
CC
SHDNLogic High
(Note 2)
V
IH
0.7 x V
CC
SHDNInput Bias
Current (Note 2)
I
, I
40
80
90
80
nA
dB
kHz
SHDN= V
= 5.5V or SHDN= V = 0
EE
IH IL
CC
Channel-to-Channel
Isolation (Note 6)
CH
Specified at DC
ISO
Gain-Bandwidth
Product
GBW
Φ
Phase Margin
Gain Margin
Slew Rate
68
18
40
degrees
dB
m
G
m
SR
V/ms
_______________________________________________________________________________________
3
S in g le /Du a l/Qu a d , +1 .8 V/1 0 µA, S OT2 3 ,
Be yo n d -t h e -Ra ils Op Am p s
ELECTRICAL CHARACTERISTICS (continued)
(V
= +1.8V to +5.5V, V
= 0, V
= 0, V
= V
/ 2, R = 100kΩ tied to V
/ 2, SHDN = V , T = +25°C, unless
CC CC A
CC
EE
CM
OUT
CC
L
otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage-Noise
Density
e
n
f = 1kHz
f = 1kHz
70
nV/√Hz
Input Current-Noise
Density
i
0.05
pA/√Hz
n
Capacitive-Load
Stability
A
= +1V/V, no sustained oscillations
200
50
pF
µs
µs
VCL
Shutdown Time
t
SHDN
Enable Time from
Shutdown
t
150
ENABLE
Power-Up Time
t
200
3
µs
ON
Input Capacitance
C
pF
IN
Total Harmonic
Distortion
0–MAX24
THD
f
= 1kHz, V
= 5.0V, V
= 2Vp-p, A = +1V/V
0.05
50
%
IN
CC
OUT
V
Settling Time to 0.01%
t
A
= +1V/V, V
= 5.0V, V
= 2V
STEP
µs
S
V
CC
OUT
ELECTRICAL CHARACTERISTICS
(V
= +1.8V to +5.5V, V = 0, V
= 0, V
= V
/ 2, R = 100kΩ tied to V
/ 2, SHDN = V , T = T
to T , unless oth-
MAX
CC
EE
CM
OUT
CC
L
CC
CC
A
MIN
erwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
14
UNITS
Supply-Voltage Range
V
Inferred from PSRR test
1.8
V
CC
V
V
V
V
= 1.8V
= 5.0V
= 1.8V
= 5.0V
CC
CC
CC
CC
Supply Current
per Amplifier
I
µA
µA
SHDN= V
CC
CC
19
2.0
3.5
1.2
Shutdown Supply
Current (Note 2)
I
SHDN= V
CC(SHDN)
EE
MAX4241ESA
MAX4242ESA/MAX4243ESD/
MAX4244ESD
1.3
2.0
(V - 0.2V) ≤ V
≤
CM
EE
Input Offset Voltage
V
OS
mV
(V
+ 0.2V)
CC
MAX4240EUK/MAX424_EUA/
MAX4243EUB
Input Offset Voltage
Drift
TC
2
µV/°C
VOS
Input Bias Current
Input Offset Current
I
(Note 3)
(Note 3)
15
7
nA
nA
B
I
OS
Input Common-Mode
Voltage Range
V
Inferred from the CMRR test
-0.2
V
+ 0.2
CC
V
CM
4
_______________________________________________________________________________________
S in g le /Du a l/Qu a d , +1 .8 V/1 0 µA, S OT2 3 ,
Be yo n d -t h e -Ra ils Op Am p s
0–MAX24
ELECTRICAL CHARACTERISTICS
(V
= +1.8V to +5.5V, V = 0, V
= 0, V
= V
/ 2, R = 100kΩ tied to V
/ 2, SHDN = V , T = T
to T , unless oth-
MAX
CC
EE
CM
OUT
CC
L
CC
CC
A
MIN
erwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4241ESA
65
MAX4242ESA/MAX4243ESD/
MAX4244ESD
65
V
V
= 1.8V
= 5.0V
CC
CC
MAX4240EUK/MAX424_EUA/
MAX4243EUB
61
71
71
Common-Mode
Rejection Ratio
(Note 4)
CMRR
dB
MAX4241ESA
MAX4242ESA/MAX4243ESD/
MAX4244ESD
MAX4240EUK/MAX424_EUA/
MAX4243EUB
67
73
73
MAX4241ESA
4
MAX4242ESA/MAX4243ESD/
MAX4244ESD
Power-Supply
Rejection Ratio
PSRR
1.8V ≤ V
≤ 5.5V
dB
CC
MAX4240EUK/MAX424_EUA/
MAX4243EUB
71
R = 100kΩ
72
62
80
72
L
V
V
V
V
V
V
= 1.8V
= 5.0V
= 1.8V
= 5.0V
= 1.8V
= 5.0V
CC
CC
CC
CC
CC
CC
R = 10kΩ
L
Large-Signal
Voltage Gain
(V + 0.2V) ≤ V
≤
EE
OUT
A
dB
mV
mV
VOL
(V
- 0.2V)
CC
R = 100kΩ
L
R = 10kΩ
L
R = 100kΩ
L
25
95
30
145
20
50
25
75
R = 10kΩ
L
Output Voltage
Swing High
Specified as
- V
V
OH
V
CC
OH
R = 100kΩ
L
R = 10kΩ
L
R = 100kΩ
L
R = 10kΩ
L
Output Voltage
Swing Low
Specified as
- V
V
OL
V
EE
OL
R = 100kΩ
L
R = 10kΩ
L
Output Leakage
Current in Shutdown
(Notes 2, 5)
I
100
nA
V
SHDN= V = 0, V
= 5.5V
OUT(SHDN)
EE
CC
SHDNLogic Low
(Note 2)
V
0.3 x V
CC
IL
_______________________________________________________________________________________
5
S in g le /Du a l/Qu a d , +1 .8 V/1 0 µA, S OT2 3 ,
Be yo n d -t h e -Ra ils Op Am p s
ELECTRICAL CHARACTERISTICS (continued)
4
(V
= +1.8V to +5.5V, V = 0, V
= 0, V
= V
/ 2, R = 100kΩ tied to V
/ 2, SHDN = V , T = T
to T , unless oth-
MAX
CC
EE
CM
OUT
CC
L
CC
CC
A
MIN
erwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SHDNLogic High
(Note 2)
V
0.7 x V
V
IH
CC
SHDNInput Bias
Current (Note 2)
I , I
IH IL
120
nA
SHDN= V
= 5.5V or SHDN= V = 0
EE
CC
Note 1: The MAX4240EUK, MAX4241EUA, MAX4242EUA, and MAX4243EUB specifications are 100% tested at T = +25°C. All
A
temperature limits are guaranteed by design.
Note 2: Shutdown mode applies to the MAX4241/MAX4243 only.
Note 3: Input bias current and input offset current are tested with V
Note 4: Tested over the specified input common-mode range.
= +0.5V and +0.5V ≤ V
≤ +4.5V.
CM
CC
Note 5: Tested for 0 ≤ V
≤ V . Does not include current through external feedback network.
OUT
CC
Note 6: Channel-to-channel isolation specification applies to the MAX4242/MAX4243/MAX4244 only.
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
0–MAX24
(V
= +5.0V, V = 0, V
= V / 2, V
= V , R = 100kΩ to V / 2, T = +25°C, unless otherwise noted.)
SHDN CC L CC A
CC
EE
CM
CC
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
SHUTDOWN SUPPLY CURRENT
PER AMPLIFIER vs. TEMPERATURE
MINIMUM OPERATING VOLTAGE
vs. TEMPERATURE
20
5
1.8
1.7
1.6
1.5
1.4
1.3
1.2
PSRR ≥ 80dB
18
16
14
12
10
8
4
3
2
1
0
V
CC
= +5.5V
V
= +5.5V
= +1.8V
CC
V
= +1.8V
CC
6
V
CC
4
1.1
1.0
2
0
40
TEMPERATURE (°C)
0
80
40
TEMPERATURE (°C)
-60 -40 -20
0
20
60 80 100
-60 -40 -20
20 40 60
100
-60 -40 -20
0
20
60 80 100
TEMPERATURE (°C)
INPUT BIAS CURRENT vs.
COMMON-MODE VOLTAGE (V = 1.8V)
CC
INPUT BIAS CURRENT
vs. TEMPERATURE
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
5.0
2.5
0
0
-1
-2
-3
-4
400
300
200
100
0
V
= 0
CM
V
CC
= +1.8V
V
= +1.8V
= +5.5V
CC
V
CC
-2.5
-5.0
40
-0.2
0.2
0.6
1.0
(V)
1.4
1.8
-60 -40 -20
0
20
60 80 100
40
TEMPERATURE (°C)
-60 -40 -20
0
20
60 80 100
V
CM
TEMPERATURE (°C)
6
_______________________________________________________________________________________
S in g le /Du a l/Qu a d , +1 .8 V/1 0 µA, S OT2 3 ,
Be yo n d -t h e -Ra ils Op Am p s
0–MAX24
____________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V
= +5.0V, V = 0, V
= V / 2, V
= V , R = 100kΩ to V / 2, T = +25°C, unless otherwise noted.)
SHDN CC L CC A
CC
EE
CM
CC
INPUT BIAS CURRENT vs.
COMMON-MODE VOLTAGE (V = 5.5V)
OUTPUT SWING HIGH
vs. TEMPERATURE
OUTPUT SWING LOW
vs. TEMPERATURE
CC
5.0
120
120
100
80
V
CC
= +5.5V
R TO V
L
EE
R TO V
L
CC
100
80
2.5
0
V
= +1.8V, R = 10kΩ
L
CC
60
60
V
CC
= +5.5V, R = 20kΩ
L
V
CC
= +5.5V, R = 20kΩ
L
40
40
V
= +1.8V, R = 10kΩ
L
CC
-2.5
-5.0
V
= +5.5V, R = 100kΩ
L
CC
V
CC
= +5.5V, R = 100kΩ
L
20
0
20
0
V
= +1.8V, R = 100kΩ
L
V
= +1.8V, R = 100kΩ
L
CC
CC
4
1.5
2.5
(V)
3.5
5.5
40
TEMPERATURE (°C)
40
TEMPERATURE (°C)
-0.5
0.5
4.5
-60 -40 -20
0
20
60 80 100
-60 -40 -20
0
20
60 80 100
V
CM
OPEN-LOOP GAIN vs. OUTPUT SWING LOW
(V = +1.8V, R TIED TO V )
OPEN-LOOP GAIN vs. OUTPUT SWING HIGH
(V = +1.8V, R TIED TO V )
COMMON-MODE REJECTION
vs. TEMPERATURE
CC
L
EE
CC
L
EE
100
90
100
90
-80
-85
R = 100kΩ
L
R = 100kΩ
L
80
80
R = 10kΩ
L
R = 10kΩ
L
70
60
70
60
V
= +1.8V
= +5.5V
CC
-90
V
CC
50
40
30
50
40
30
-95
-100
0
100
200
300
400
500
0
100
200
300
400
500
40
TEMPERATURE (°C)
-60 -40 -20
0
20
60 80 100
ΔV (mV)
ΔV (mV)
OUT
OUT
OPEN-LOOP GAIN vs. OUTPUT SWING HIGH
(V = +5.5V, R TIED TO V )
OPEN-LOOP GAIN vs. OUTPUT SWING LOW
(V = +5.5V, R TIED TO V )
OPEN-LOOP GAIN
vs. TEMPERATURE
CC
L
EE
CC
L
EE
110
100
90
110
105
100
95
110
100
R = 100kΩ
L
R = 100kΩ
L
V
CC
= +5.5V, R = 20kΩ TO V
L EE
90
80
R = 20kΩ
L
R = 20kΩ
L
80
90
V
CC
= +5.5V, R = 20kΩ TO V
L
CC
70
60
70
60
85
V
CC
= +1.8V, R = 10kΩ TO V
EE
L
80
50
40
50
40
75
V
CC
= +1.8V, R = 10kΩ TO V
L CC
70
0
100
200
300
400
40
TEMPERATURE (°C)
0
100
200
ΔV (mV)
300
400
-60 -40 -20
0
20
60 80 100
ΔV (mV)
OUT
OUT
_______________________________________________________________________________________
7
Single/Dual/Quad, +1.8V/10µA, SOT23,
Beyond-the-Rails Op Amps
Typical Operating Characteristics (continued)
(V = +5.0V, V = 0, V
= V /2, V
= V , R = 100kΩ to V /2, T = +25°C unless otherwise noted.)
SHDN CC L CC A
CC
EE
CM
CC
GAIN AND PHASE vs. FREQUENCY
(C = 100pF)
OPEN-LOOP GAIN
vs. TEMPERATURE
GAIN AND PHASE vs. FREQUENCY
L
(C = 0pF)
L
MAX4240/44-17
MAX4240/44-16
110
105
100
95
60
180
60
180
A = +1000V/V
V
A = +1000V/V
V
50
40
144
108
50
40
30
20
144
108
V
CC
= +5.5V, R TO V
L
EE
30
20
72
36
72
36
V
CC
= +5.5V, R TO V
L CC
90
10
0
0
10
0
0
V
= +1.8V, R TO V
L
CC
V
EE
-36
-72
-108
-144
-36
-72
-108
-144
85
= +1.8V, R TO V
CC
CC
L
-10
-20
-30
-40
-10
-20
-30
80
75
70
-180
-40
-180
40
TEMPERATURE (°C)
-60 -40 -20
0
20
60 80 100
10
100
1k
10k
100k
10
100
1k
10k
100k
0–MAX24
FREQUENCY (Hz)
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS NOISE
MAX4242/MAX4243/MAX4244
CROSSTALK vs. FREQUENCY
VOLTAGE NOISE
vs. FREQUENCY
vs. FREQUENCY
1
1000
100
10
-60
-70
R = 10k1
L
-80
0.1
-90
-100
-110
R = 100k1
L
R = 10k1
L
0.01
0.1
1
10
100
1
10
100
1000
10
1k
10k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
SMALL-SIGNAL TRANSIENT RESPONSE
SMALL-SIGNAL TRANSIENT RESPONSE
LOAD RESISTOR vs.
CAPACITIVE LOAD
(NONINVERTING)
(INVERTING)
MAX4240/44-22
MAX4240/44-23
1000
100
10
10%
OVERSHOOT
100mV
0V
100mV
0V
IN
50mV/div
OUT
IN
REGION OF
MARGINAL STABILITY
0mV/div
100mV
0V
100mV
0V
OUT
REGION OF
STABLE OPERATION
0
250
500
(pF)
750
1000
10μs/div
10μs/div
C
LOAD
8
_______________________________________________________________________________________
Single/Dual/Quad, +1.8V/10µA, SOT23,
Beyond-the-Rails Op Amps
0–MAX24
Typical Operating Characteristics (continued)
(V = +5.0V, V = 0, V
= V /2, V
= V , R = 100kΩ to V /2, T = +25°C unless otherwise noted.)
SHDN CC L CC A
CC
EE
CM
CC
Pin Description
_______________________________________________________________________________________
9
S in g le /Du a l/Qu a d , +1 .8 V/1 0 µA, S OT2 3 ,
Be yo n d -t h e -Ra ils Op Am p s
_______________De t a ile d De s c rip t io n
Be yo n d -t h e -Ra ils In p u t S t a g e
The MAX4240–MAX4244 have Beyond-the-Rails inputs
and rail-to-rail output stages that are specifically
MAX4240
MAX4241
MAX4242
MAX4243
MAX4244
V
IN
designed for low-voltage, single-supply operation. The
input stage consists of separate NPN and PNP differen-
tial stages, which operate together to provide a com-
mon-mode range extending to 200mV beyond both
supply rails. The crossover region of these two pairs
R3
R3 = R1 R2
occurs halfway between V
and V . The input offset
EE
CC
voltage is typically 200µV. Low operating supply voltage,
low supply current, beyond-the-rails common-mode
input range, and rail-to-rail outputs make this family of
operational amplifiers an excellent choice for precision or
general-purpose, low-voltage battery-powered systems.
R1
R2
Since the input stage consists of NPN and PNP pairs,
the input bias current changes polarity as the common-
mode voltage passes through the crossover region.
Match the effective impedance seen by each input to
reduce the offset error caused by input bias currents
flowing through external source impedances (Figures
1a and 1b). 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 improves response in this case.
Figure 1a. Minimizing Offset Error Due to Input Bias Current
(Noninverting)
0–MAX24
MAX4240
MAX4241
MAX4242
MAX4243
MAX4244
R3
The MAX4240–MAX4244 family’s inputs are protected
from large differential input voltages by internal 2.2kΩ
series resistors and back-to-back triple-diode stacks
across the inputs (Figure 2). For differential input volt-
ages (much less than 1.8V), input resistance is typically
45MΩ. For differential input voltages greater than 1.8V,
input resistance is around 4.4kΩ, and the input bias
current can be approximated by the following equation:
R3 = R1 R2
V
IN
R1
R2
I
= (V
- 1.8V) / 4.4kΩ
BIAS
DIFF
Figure 1b. Minimizing Offset Error Due to Input Bias Current
(Inverting)
IN+
2.2k
Ω
IN-
2.2k
Ω
Figure 2. Input Protection Circuit
10 ______________________________________________________________________________________
S in g le /Du a l/Qu a d , +1 .8 V/1 0 µA, S OT2 3 ,
Be yo n d -t h e -Ra ils Op Am p s
0–MAX24
In the region where the differential input voltage
MAX4240-44 fig03
approaches 1.8V, the input resistance decreases expo-
nentially from 45MΩ to 4.4kΩ as the diode block begins
conducting. Conversely, the bias current increases with
the same curve.
R = 100kΩ TIED TO V
L
EE
V = 2.0V
IN
f
IN
= 1kHz
1V/div
OUT
Ra il-to-Ra il Output Sta ge
The MAX4240–MAX4244 output stage can drive up to a
10kΩ load and still swing to within 40mV of the rails.
Figure 3 shows the output voltage swing of a MAX4240
configured as a unity-gain buffer, powered from a single
+2V supply voltage. The output for this setup typically
1V/div
IN
swings from (V + 6mV) to (V
EE
- 8mV) with a 100kΩ
CC
load.
200µs/div
__________Ap p lic a t io n s In fo rm a t io n
Figure 3. Rail-to-Rail Input/Output Voltage Range
P o w e r-S u p p ly Co n s id e ra t io n s
The MAX4240–MAX4244 operate from a single +1.8V
to +5.5V supply (or dual 0.9V to 2.75V supplies) and
consume only 10µA of supply current per amplifier. A
high power-supply rejection ratio of 85dB allows the
amplifiers to be powered directly off a decaying battery
voltage, simplifying design and extending battery life.
4
100
T = +85°C
A
90
80
70
The MAX4240–MAX4244 are ideally suited for use with
most battery-powered systems. Table 1 lists a variety of
typical battery types showing voltage when fresh, volt-
age at end-of-life, capacity, and approximate operating
time from a MAX4240/MAX4241, assuming nominal
conditions for both normal and shutdown modes.
T = -40°C
A
T = +25°C
A
Although the amplifiers are fully guaranteed over tem-
perature for operation down to a +1.8V single supply,
even lower-voltage operation is possible in practice.
Figures 4 and 5 show the PSRR and supply current as
a function of supply voltage and temperature.
60
1.0
1.2
1.4
1.6
1.8
2.0
SUPPLY VOLTAGE (V)
Figure 4. Power-Supply Rejection Ratio vs. Supply Voltage
P o w e r-Up S e t t lin g Tim e
The MAX4240–MAX4244 typically require 200µs to
12
10
8
power up after V
is stable. During this start-up time,
CC
the output is indeterminant. The application circuit
should allow for this initial delay.
S h u t d o w n Mo d e
The MAX4241 (single) and MAX4243 (dual) feature a
low-power shutdown mode. When the shutdown pin
(SHDN) is pulled low, the supply current drops to 1µA
per amplifier, the amplifier is disabled, and the outputs
enter a high-impedance state. Pulling SHDN high or
leaving it floating enables the amplifier. Take care to
ensure that parasitic leakage current at the SHDN pin
does not inadvertently place the part into shutdown
mode when SHDN is left floating. Figure 6 shows the
output voltage response to a shutdown pulse. The logic
T = +85°C
A
6
4
2
T = -40°C
A
T = +25°C
A
0
1.0
1.2
1.4
1.6
1.8
2.0
SUPPLY VOLTAGE (V)
threshold for SHDN is always referred to V
/ 2 (not to
CC
Figure 5. Supply Current vs. Supply Voltage
______________________________________________________________________________________ 11
S in g le /Du a l/Qu a d , +1 .8 V/1 0 µA, S OT2 3 ,
Be yo n d -t h e -Ra ils Op Am p s
Table 1. MAX4240/MAX4241 Characteristics with Typical Battery Systems
4
MAX4240/MAX4241
CAPACITY,
AA SIZE
(mA-h)
MAX4241
V
V
OPERATING TIME
IN NORMAL MODE
(Hours)
OPERATING TIME
IN SHUTDOWN
MODE (Hours)
FRESH
(V)
END-OF-LIFE
(V)
BATTERY TYPE
RECHARGEABLE
Alkaline (2 Cells)
No
Yes
Yes
Yes
3.0
2.4
3.5
2.4
1.8
1.8
2.7
1.8
2000
750
200,000
75,000
2 x 106
0.75 x 106
106
Nickel-
Cadmium (2 Cells)
Lithium-Ion (1 Cell)
1000
1000
100,000
100,000
Nickel-Metal-
Hydride (2 Cells)
106
MAX4240-44 fig06
1200
V = 2V
IN
V
= 5.5V, V = 200mV
OH
CC
R = 100kΩ TIED TO V
L
EE
1000
800
600
400
200
0–MAX24
SHDN
OUT
V
V
OH
= 1.8V,
= 200mV
CC
5V/div
1V/div
V
CC
= 5.5V, V = 100mV
OH
V
V
OH
= 1.8V,
= 100mV
CC
V
CC
= 5.5V, V = 50mV
OH
V
CC
= 1.8V, V = 50mV
OH
0
-60 -40 -20
0
20 40 60 80 100
200µs/div
TEMPERATURE (°C)
Figure 6. Shutdown Enable/Disable Output Voltage
Figure 7a. Output Source Current vs. Temperature
GND). When using dual supplies, pull SHDN to V to
EE
3000
enter shutdown mode.
V
= 5.5V, V = 200mV
OL
CC
Lo a d -Drivin g Ca p a b ilit y
The MAX4240–MAX4244 are fully guaranteed over tem-
perature and supply voltage to drive a maximum resis-
2500
2000
1500
1000
500
V
= 1.8V, V = 200mV
OL
CC
tive load of 10kΩ to V
/ 2, although heavier loads can
CC
V
= 5.5V,
= 100mV
CC
be driven in many applications. The rail-to-rail output
stage of the amplifier can be modeled as a current
source when driving the load toward V , and as a cur-
CC
rent sink when driving the load toward V . The magni-
EE
tude of this current source/sink varies with supply
voltage, ambient temperature, and lot-to-lot variations
of the units.
V
OL
V
CC
= 1.8V, V = 100mV
OL
V
CC
= 5.5V, V = 50mV
OL
V
CC
= 1.8V, V = 50mV
OL
0
-60 -40 -20
0
20 40 60 80 100
Figures 7a and 7b show the typical current source and
sink capability of the MAX4240–MAX4244 family as a
function of supply voltage and ambient temperature.
The contours on the graph depict the output current
TEMPERATURE (°C)
Figure 7b. Output Sink Current vs. Temperature
12 ______________________________________________________________________________________
S in g le /Du a l/Qu a d , +1 .8 V/1 0 µA, S OT2 3 ,
Be yo n d -t h e -Ra ils Op Am p s
0–MAX24
value, based on driving the output voltage to within
50mV, 100mV, and 200mV of either power-supply rail.
and V supplies should be bypassed to ground with
EE
separate 100nF capacitors.
For example, a MAX4241 running from a single +1.8V
Good PC board layout techniques optimize perfor-
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 exter-
nal components as close as possible to the op amp.
Surface-mount components are an excellent choice.
supply, operating at T = +25°C, can source 240µA to
A
within 100mV of V
and is capable of driving a 7kΩ
CC
:
load resistor to V
EE
1.8V - 0.1V
RL
=
= 7kΩ to V
EE
240µA
The same application can drive a 3.3kΩ load resistor
when terminated in V / 2 (+0.9V in this case).
CC
Drivin g Ca p a c it ive Lo a d s
The MAX4240–MAX4244 are unity-gain stable for loads
up to 200pF (see Load Resistor vs. Capacitive Load
graph in Typical Operating Characteristics). Applica-
tions that require greater capacitive drive capability
should use an isolation resistor between the output and
the capacitive load (Figure 8). Note that this alternative
R
ISO
4
R
C
L
L
MAX4240
MAX4241
MAX4242
MAX4243
MAX4244
results in a loss of gain accuracy because R
voltage divider with the load resistor.
forms a
ISO
P o w e r-S u p p ly Byp a s s in g a n d La yo u t
The MAX4240–MAX4244 family operates from either a
single +1.8V to +5.5V supply or dual 0.9V to 2.75V
supplies. For single-supply operation, bypass the
R
R + R
L
L
A =
≈ 1
V
ISO
power supply with a 100nF capacitor to V
(in this
EE
case GND). For dual-supply operation, both the V
CC
Figure 8a Using a Resistor to Isolate a Capacitive Load from
the Op Amp
MAX4240-44 fig08c
MAX4240-44 fig08b
50mV/div
50mV/div
IN
50mV/div
50mV/div
IN
OUT
OUT
100µs/div
100µs/div
R
ISO
= 1kΩ, R = 100kΩ, C = 700pF
R
ISO
= NONE, R = 100kΩ, C = 700pF
L
L
L
L
Figure 8c. Pulse Response with Isolating Resistor
Figure 8b. Pulse Response without Isolating Resistor
______________________________________________________________________________________ 13
S in g le /Du a l/Qu a d , +1 .8 V/1 0 µA, S OT2 3 ,
Be yo n d -t h e -Ra ils Op Am p s
Us in g t h e MAX4 2 4 0 –MAX4 2 4 4
a s Co m p a ra t o rs
Us in g t h e MAX4 2 4 0 –MAX4 2 4 4
4
a s Ult ra -Lo w -P o w e r Cu rre n t Mo n it o rs
The MAX4240–MAX4244 are ideal for applications
powered from a 2-cell battery stack. Figure 11 shows
an application circuit in which the MAX4240 is used for
monitoring the current of a 2-cell battery stack. In this
circuit, a current load is applied, and the voltage drop
at the battery terminal is sensed.
Although optimized for use as operational amplifiers,
the MAX4240–MAX4244 can also be used as rail-to-rail
I/O comparators. Typical propagation delay depends
on the input overdrive voltage, as shown in Figure 9.
External hysteresis can be used to minimize the risk of
output oscillation. The positive feedback circuit, shown
in Figure 10, causes the input threshold to change
when the output voltage changes state. The two thresh-
olds create a hysteresis band that can be calculated by
the following equations:
The voltage on the load side of the battery stack is
equal to the voltage at the emitter of Q1, due to the
feedback loop containing the op amp. As the load cur-
rent increases, the voltage drop across R1 and R2
increases. Thus, R2 provides a fraction of the load cur-
rent (set by the ratio of R1 and R2) that flows into the
emitter of the PNP transistor. Neglecting PNP base cur-
rent, this current flows into R3, producing a ground-ref-
erenced voltage proportional to the load current. Scale
R1 to give a voltage drop large enough in comparison
V
V
V
= V - V
HI LO
HYST
= V x R2 / (R1 + (R1 x R2 / R ) + R2)
HYST
LO
HI
IN
= [(R2 / R1 x V ) + (R2 / R
) x V ] /
CC
IN
HYST
(1 + R1 / R2 + R2 / R
)
HYST
The MAX4240–MAX4244 contain special circuitry to
boost internal drive currents to the amplifier output
stage. This maximizes the output voltage range over
which the amplifiers are linear. In an open-loop com-
parator application, the excursion of the output voltage
is so close to the supply rails that the output stage tran-
sistors will saturate, causing the quiescent current to
increase from the normal 10µA. Typical quiescent cur-
to V of the op amp, in order to minimize errors.
OS
0–MAX24
The output voltage of the application can be calculated
using the following equation:
V
= [I
x (R1 / R2)] x R3
OUT
LOAD
For a 1V output and a current load of 50mA, the choice
of resistors can be R1 = 2Ω, R2 = 100kΩ, R3 = 1MΩ.
The circuit consumes less power (but is more suscepti-
ble to noise) with higher values of R1, R2, and R3.
rents increase to 35µA for the output saturating at V
CC
and 28µA for the output at V
.
EE
HYSTERESIS
V
HI
INPUT
V
OH
10,000
V
LO
V
OH
t
+; V = +5V
PD CC
OUTPUT
1000
100
10
V
OL
t
-; V = +5V
PD CC
V
IN
R
HYST
R1
R2
V
CC
t
+; V = +1.8V
PD CC
V
OUT
t
-; V = +1.8V
PD CC
MAX4240
MAX4241
MAX4242
MAX4243
MAX4244
0
10 20 30 40 50 60 70 80 90 100
(mV)
V
EE
V
OD
V
EE
Figure 9. Propagation Delay vs. Input Overdrive
Figure 10. Hysteresis Comparator Circuit
14 ______________________________________________________________________________________
S in g le /Du a l/Qu a d , +1 .8 V/1 0 µA, S OT2 3 ,
Be yo n d -t h e -Ra ils Op Am p s
0–MAX24
___________________Ch ip In fo rm a t io n
I
LOAD
MAX4240/MAX4241
TRANSISTOR COUNT: 234
MAX4242/MAX4243
R1
V
CC
TRANSISTOR COUNT: 466
MAX4244
R2
TRANSISTOR COUNT: 932
SUBSTRATE CONNECTED TO V
EE
Q1
V
OUT
R3
MAX4240
4
V
EE
Figure 11. Current Monitor for a 2-Cell Battery Stack
_____________________________________________P in Co n fig u ra t io n s (c o n t in u e d )
TOP VIEW
OUTA
INA-
1
2
3
4
8
7
6
5
V
OUTA
INA-
1
2
3
4
5
10
9
V
CC
N.C.
IN-
1
2
3
4
8
7
6
5
SHDN
CC
OUTB
INB-
OUTB
INB-
V
CC
MAX4243
MAX4242
MAX4241
INA+
8
INA+
IN+
OUT
N.C.
V
EE
7
INB+
V
EE
INB+
V
EE
SHDNA
6
SHDNB
µMAX
SO/µMAX
SO/µMAX
OUTA
1
2
3
4
5
6
7
14
V
OUTA
1
2
3
4
5
6
7
14 OUTD
13 IND-
12 IND+
CC
INA-
13 OUTB
12 INB-
11 INB+
10 N.C.
INA-
INA+
INA+
V
EE
V
CC
11
V
EE
MAX4243
MAX4244
N.C.
SHDNA
N.C.
INB+
INB-
10 INC+
9
8
SHDNB
N.C.
9
8
INC-
OUTB
OUTC
SO
SO
______________________________________________________________________________________ 15
Single/Dual/Quad, +1.8V/10µA, SOT23,
Beyond-the-Rails Op Amps
Tape-and-Reel Information
E
W
B
D
0
P
P
2
0
t
D
1
F
P
NOTE: DIMENSIONS ARE IN MM.
AND FOLLOW EIA481-1 STANDARD.
K
0
A
0
±0.102
±0.102
P0
P010
P2
t
3.988
40.005
2.007
±0.102
±0.203
±0.051
±0.127
A0
B0
3.200
3.099
E
1.753
3.505
1.397
3.988
±0.102
F
±0.051
±0.102
±0.102
+0.102
+0.000
K0
P
D
1.499
0.991
0.254
+0.254
+0.000
D1
0–MAX24
+0.305
-0.102
W
8.001
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.)
Revision History
Pages changed at Rev 3: 1, 8, 9, 16
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
© 2006 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products. Inc.
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