19-0431; Rev 2; 8/01
Ultra-Low-Power, Single-Supply
Op Amp + Comparator + Reference
General Description
The MAX951–MAX954 feature combinations of a
micropower operational amplifier, comparator, and ref-
erence in an 8-pin package. In the MAX951 and
MAX952, the comparator’s inverting input is connected
to an internal 1.2V ±2% bandgap reference. The
MAX953 and MAX954 are offered without an internal
reference. The MAX951/MAX952 operate from a single
2.7V to 7V supply with a typical supply current of 7µA,
while the MAX953/MAX954 operate from 2.4V to 7V with
a 5µA typical supply current. Both the op amp and
comparator feature a common-mode input voltage
range that extends from the negative supply rail to with-
in 1.6V of the positive rail, as well as output stages that
swing Rail-to-Rail
®
.
The op amps in the MAX951/MAX953 are internally
compensated to be unity-gain stable, while the op
amps in the MAX952/MAX954 feature 125kHz typical
bandwidth, 66V/ms slew rate, and stability for gains of
10V/V or greater. These op amps have a unique output
stage that enables them to operate with an ultra-low
supply current while maintaining linearity under loaded
conditions. In addition, they have been designed to
exhibit good DC characteristics over their entire operat-
ing temperature range, minimizing input-referred errors.
The comparator output stage of these devices continu-
ously sources as much as 40mA. The comparators
eliminate power-supply glitches that commonly occur
when changing logic states, minimizing parasitic feed-
back and making the devices easier to use. In addition,
they contain ±3mV internal hysteresis to ensure clean
output switching, even with slow-moving input signals.
Features
o
Op Amp + Comparator + Reference in an 8-Pin
µMAX Package (MAX951/MAX952)
o
7µA Typical Supply Current
(Op Amp + Comparator + Reference)
o
Comparator and Op Amp Input Range Includes
Ground
o
Outputs Swing Rail-to-Rail
o
2.4V to 7V Supply Voltage Range
o
Unity-Gain Stable and 125kHz Decompensated
A
V
≥
10V/V Op Amp Options
o
Internal 1.2V ±2% Bandgap Reference
o
Internal Comparator Hysteresis
o
Op Amp Capable of Driving up to 1000pF Load
MAX951–MAX954
Selector Guide
PART
INTERNAL
OP AMP
SUPPLY
2%
GAIN
PRECISION STABILITY COMPARATOR CURRENT
(µA)
REFERENCE
(V/V)
MAX951
MAX952
MAX953
MAX954
Yes
Yes
No
No
1
10
1
10
Yes
Yes
Yes
Yes
7
7
5
5
Applications
Instruments, Terminals, and Bar-Code Readers
Battery-Powered Systems
Automotive Keyless Entry
Low-Frequency, Local-Area Alarms/Detectors
Photodiode Preamps
Smart Cards
Infrared Receivers for Remote Controls
Smoke Detectors and Safety Sensors
AMPOUT
1
AMPIN-
2
AMPIN+
3
V
SS
4
Pin Configuration
TOP VIEW
8
V
DD
COMPOUT
REF (COMPIN-)
COMPIN+
MAX951
MAX952
MAX953
MAX954
DIP/SO/µMAX
7
6
5
( ) ARE FOR MAX953/MAX954
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Typical Operating Circuit and Ordering Information appear
at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
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.
Ultra-Low-Power, Single-Supply
Op Amp + Comparator + Reference
MAX951–MAX954
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
DD
to V
SS
) ....................................................9V
Inputs
Current (AMPIN_, COMPIN_)..........................................20mA
Voltage (AMPIN_, COMPIN_).......(V
DD
+ 0.3V) to (V
SS
- 0.3V)
Outputs
Current (AMPOUT, COMPOUT)......................................50mA
Current (REF) ..................................................................20mA
Voltage (AMPOUT, COMPOUT,
REF)...................................(V
DD
+ 0.3V) to (V
SS
- 0.3V)
Short-Circuit Duration (REF, AMPOUT)..................Continuous
Short-Circuit Duration (COMPOUT, V
DD
to V
SS
≤
7V) ......1min
Continuous Power Dissipation (T
A
= +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ...727mW
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
8-Pin µMAX (derate 4.10mW/°C above +70°C) ...........330mW
8-Pin CERDIP (derate 8.00mW/°C above +70°C)........640mW
Operating Temperature Ranges
MAX95_E_A .....................................................-40°C to +85°C
MAX95_MJA ..................................................-55°C to +125°C
Maximum Junction Temperatures
MAX95_E_A .................................................................+150°C
MAX95_MJA.................................................................+175°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
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
DD
= 2.8V to 7V for MAX951/MAX952, V
DD
= 2.4V to 7V for MAX953/MAX954, V
SS
= 0, V
CM COMP
= 0 for the MAX953/MAX954,
V
CM OPAMP
= 0, AMPOUT = (V
DD
+ V
SS
)/2, COMPOUT = low, T
A
= T
MIN
to T
MAX
, typical values are at T
A
= +25°C, unless
otherwise noted.)
PARAMETER
Supply Voltage Range
SYMBOL
V
DD
CONDITIONS
MAX951/MAX952
T
A
= -10°C to +85°C
MAX953/MAX954
T
A
= +25°C, MAX951/MAX952
MAX951E/MAX952E
Supply Current
(Note 1)
I
S
MAX951M/MAX952M
T
A
= +25°C, MAX953/MAX954
MAX953E/MAX954E
MAX953M/MAX954M
COMPARATOR
T
A
= +25°C
Input Offset Voltage
(Note 2)
V
OS
MAX95_EPA/ESA
MAX95_EUA (µMAX)
MAX95_MJA
T
A
= +25°C
Trip Point
(Note 3)
MAX95_EUA (µMAX)
MAX95_EPA/ESA
MAX95_MJA
Input Leakage Current
(Note 4)
Common-Mode Input Range
Common-Mode Rejection Ratio
CMVR
CMRR
V
SS
to (V
DD
- 1.6V), MAX953/MAX954
T
A
= +25°C
MAX95_E
MAX95_M
V
SS
0.1
4
17
5
7
0.003
0.003
0.050
5
40
V
DD
- 1.6V
1
V
mV/V
nA
mV
1
3
14
14
6
mV
5
T
A
= T
MIN
to T
MAX
T
A
= -10°C to +85°C
MIN
2.8
2.7
2.4
7
TYP
MAX
7.0
7.0
7.0
10
11
13
8
9
11
µA
V
UNITS
2
_______________________________________________________________________________________
Ultra-Low-Power, Single-Supply
Op Amp + Comparator + Reference
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 2.8V to 7V for MAX951/MAX952, V
DD
= 2.4V to 7V for MAX953/MAX954, V
SS
= 0, V
CM COMP
= 0 for the MAX953/MAX954,
V
CM OPAMP
= 0, AMPOUT = (V
DD
+ V
SS
)/2, COMPOUT = low, T
A
= T
MIN
to T
MAX
, typical values are at T
A
= +25°C, unless
otherwise noted.)
PARAMETER
Power-Supply Rejection Ratio
Response Time
Output High Voltage
Output Low Voltage
REFERENCE
MAX95_EPA/ESA
Reference Voltage
(Note 5)
V
REF
MAX95_EUA (µMAX)
MAX95_MJA
I
OUT
= ±20µA, T
A
= +25°C
Load Regulation
Voltage Noise
OP AMP
T
A
= +25°C
Input Offset Voltage
V
OS
MAX95_EPA/ESA
MAX95_EUA (µMAX)
MAX95_MJA
T
A
= +25°C
Input Bias Current
I
B
MAX95_E
MAX95_M
Large-Signal Gain
(No Load)
A
VOL
AMPOUT = 0.5V to
4.5V, V
DD
- V
SS
= 5V
T
A
= +25°C
MAX95_E
MAX95_M
T
A
= +25°C
MAX95_E
MAX95_M
100
50
10
40
25
5
20
125
12.5
66
V
SS
V
CM OPAMP
= V
SS
to (V
DD
- 1.6V)
V
DD
= 2.8V to 7V, MAX951/MAX952
V
DD
= 2.4V to 7V, MAX953/MAX954
f
o
= 1kHz
f
o
= 0.1Hz to 10Hz
0.03
0.07
0.07
80
1.2
V
DD
- 1.6
1
1.0
1.0
kHz
V/ms
V
mV/V
mV/V
nV√Hz
µV
P-P
150
V/mV
0.003
0.003
0.003
1000
V/mV
1
3
4
5
5
0.050
5
40
nA
mV
e
n
I
OUT
= ±6µA, MAX95_E
I
OUT
= ±3µA, MAX95_M
0.1Hz to 10Hz
16
1.176
1.130
1.164
1.200
1.200
1.200
0.1
1.5
1.5
µV
P-P
%
1.224
1.270
1.236
V
SYMBOL
PSRR
t
pd
V
OH
V
OL
CONDITIONS
MAX951/MAX952, V
DD
= 2.8V to 7V
MAX953/MAX954, V
DD
= 2.4V to 7V
V
OD
= 10mV
C
L
= 100pF, T
A
=
+25°C, V
DD
- V
SS
= 5V V
OD
= 100mV
I
SOURCE
= 2mA
I
SINK
= 1.8mA
V
DD
- 0.4V
V
SS
+ 0.4V
MIN
TYP
0.05
0.05
22
4
MAX
1
1
UNITS
mV/V
µs
V
V
MAX951–MAX954
Large-Signal Gain
(100kΩ Load to V
SS
)
Gain Bandwidth
Slew Rate
Common-Mode Input Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Input Noise Voltage
A
VOL
AMPOUT = 0.5V to
4.5V, V
DD
- V
SS
= 5V
GBW
SR
CMVR
CMRR
PSRR
en
A
V
= 1V/V, MAX951/MAX953, V
DD
- V
SS
= 5V
A
V
= 10V/V, MAX952/MAX954, V
DD
- V
SS
= 5V
A
V
= 1V/V, MAX951/MAX953, V
DD
- V
SS
= 5V
A
V
= 10V/V, MAX952/MAX954, V
DD
- V
SS
= 5V
_______________________________________________________________________________________
3
Ultra-Low-Power, Single-Supply
Op Amp + Comparator + Reference
MAX951–MAX954
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 2.8V to 7V for MAX951/MAX952, V
DD
= 2.4V to 7V for MAX953/MAX954, V
SS
= 0, V
CM COMP
= 0 for the MAX953/MAX954,
V
CM OPAMP
= 0, AMPOUT = (V
DD
+ V
SS
)/2, COMPOUT = low, T
A
= T
MIN
to T
MAX
, typical values are at T
A
= +25°C, unless
otherwise noted.)
PARAMETER
Output High Voltage
Output Low Voltage
SYMBOL
V
OH
V
OL
CONDITIONS
R
L
= 100kΩ to V
SS
R
L
= 100kΩ to V
SS
T
A
= +25°C
Output Source Current
I
SRC
T
A
= +25°C, V
DD
- V
SS
= 5V
MAX95_E
MAX95_M
T
A
= +25°C
Output Sink Current
I
SNK
T
A
= +25°C, V
DD
- V
SS
= 5V
MAX95_E
MAX95_M
70
300
60
40
70
200
50
30
570
µA
µA
820
µA
MIN
TYP
MAX
UNITS
V
V
SS
+ 50mV
V
V
DD
- 500mV
Note 1:
Supply current is tested with COMPIN+ = (REF - 100mV) for MAX951/MAX952, and COMPIN+ = 0 for MAX953/MAX954.
Note 2:
Input Offset Voltage is defined as the center of the input-referred hysteresis. V
CM COMP
= REF for MAX951/MAX952, and
V
CM COMP
= 0 for MAX953/MAX954.
Note 3:
Trip Point is defined as the differential input voltage required to make the comparator output change. The difference
between upper and lower trip points is equal to the width of the input-referred hysteresis. V
CM COMP
= REF for
MAX951/MAX952, and V
CM COMP
= 0 for MAX953/MAX954.
Note 4:
For MAX951/MAX952, input leakage current is measured for COMPIN- at the reference voltage. For MAX953/MAX954, input
leakage current is measured for both COMPIN+ and COMPIN- at V
SS
.
Note 5:
Reference voltage is measured with respect to V
SS
. Contact factory for availability of a 3% accurate reference voltage in the
µMAX package.
4
________________________________________________________________________________________
Ultra-Low-Power, Single-Supply
Op Amp + Comparator + Reference
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
MAX951–MAX954
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX951-954-toc01
SUPPLY CURRENT
vs. TEMPERATURE
9
SUPPLY CURRENT (µA)
8
7
6
5
4
3
2
1
0
V
DD
= 2.8V (MAX951/952), V
DD
= 2.4V
(MAX953/954), V
SS
= 0, V
CM OPAMP
= 0
AMPOUT = 1/2 V
DD
, COMP- = 1.2V or REF
COMP+ = 1.1V
-60 -40 -20 0
20 40 60 80 100 120 140
MAX953/MAX954
MAX951/MAX952
MAX951-954-toc02
REFERENCE VOLTAGE vs. TEMPERATURE
1.215
REFERENCE VOLTAGE (V)
1.210
1.205
1.200
1.195
1.190
1.185
1.180
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
V
DD
= 5V
MAX951-954-toc03
9
8
SUPPLY CURRENT (µA)
7
6
5
4
3
2
1
0
V
CM OPAMP
= 0
AMPOUT = (V
DD
+ V
SS
)/2
COMP- = 1.2V or REF
COMP+ = 1.1V
MAX953/MAX954
MAX951/MAX952
10
1.220
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
REFERENCE OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX951-954-toc04
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX951-954-toc05
DC OPEN-LOOP GAIN vs.
SUPPLY VOLTAGE
1x10
6
DC OPEN-LOOP GAIN (V/V)
1x10
5
1x10
4
1x10
3
1x10
2
1x10
1
1x10
0
1mHz INPUT SIGNAL
R
L
= 100kΩ
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
MAX951-954-toc06
1.30
1.28
REFERENCE VOLTAGE (V)
1.26
1.24
V
SUPPLY
= 5V
SINKING CURRENT
80
70
60
PSRR (dB)
50
40
30
20
10
0
1.22
1.20
1.18
1.16
1.14
1.12
1.10
1
10
LOAD CURRENT (µA)
100
SOURCING CURRENT
V
DD
= 2.0 to 3.0V, V
SS
= -2.5V
NONINVERTING
AMPIN+ = 0
A
CL
= 1V/V (MAX951/2)
A
CL
= 10V/V (MAX953/4),
COMP- = 1.2V or REF
COMP+ = 1.1V from V
SS
1x10
7
A
C
B
A: MAX951/952 REF
B: MAX951/953 OP AMP
C: MAX952/954 OP AMP
1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
DC OPEN-LOOP GAIN
vs. TEMPERATURE
MAX951-954-toc07
1x10
6
1x10
5
1x10
4
1x10
3
1x10
2
1x10
1
1x10
0
V
DD
= 5V
1MHz INPUT SIGNAL
R
L
= 100kΩ
-60 -40 -20 0
100
80
OPEN-LOOP GAIN (dB)
60
MAX951/MAX953
OPEN-LOOP GAIN AND PHASE
vs. FREQUENCY
MAX951-954-toc08
0
-60
PHASE SHIFT (Degrees)
100
80
OPEN-LOOP GAIN (dB)
60
40
MAX952/MAX954
OPEN-LOOP GAIN AND PHASE
vs. FREQUENCY
MAX951-954-toc09
0
-60
DC OPEN-LOOP GAIN (V/V)
PHASE
GAIN
-120
-180
-240
-300
PHASE
-120
-180
40
20
0
R
L
= 100kΩ
GAIN
20
0
R
L
= 100kΩ
-20
1
10
100
1k
10k
100k
FREQUENCY (Hz)
-240
-300
-360
1M
-20
1
10
100
1k
10k
100k
FREQUENCY (Hz)
20 40 60 80 100 120 140
-360
1M
TEMPERATURE (°C)
__________________________________________________________________________________________________
5
PHASE SHIFT (Degrees)
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