Not Recommended for New Designs
The MAX495 was manufactured for Maxim by an outside wafer
foundry using a process that is no longer available. It is not
recommended for new designs. A Maxim replacement or an industry
second-source may be available. The data sheet remains available for
existing users.
The other parts on the following data sheet are not
affected.
For further information, please see the QuickView data sheet for this
part or contact
technical support
for assistance.
19-0265; Rev 2; 9/96
Single/Dual/Quad, Micropower,
Single-Supply Rail-to-Rail Op Amps
_______________General Description
The dual MAX492, quad MAX494, and single MAX495
operational amplifiers combine excellent DC accuracy
with rail-to-rail operation at the input and output. Since
the common-mode voltage extends from V
CC
to V
EE
,
the devices can operate from either a single supply
(+2.7V to +6V) or split supplies (±1.35V to ±3V). Each
op amp requires less than 150µA supply current. Even
with this low current, the op amps are capable of driving
a 1kΩ load, and the input referred voltage noise is only
25nV/√Hz. In addition, these op amps can drive loads in
excess of 1nF.
The precision performance of the MAX492/MAX494/
MAX495, combined with their wide input and output
dynamic range, low-voltage single-supply operation, and
very low supply current, makes them an ideal choice for
battery-operated equipment and other low-voltage appli-
cations. The MAX492/MAX494/MAX495 are available in
DIP and SO packages in the industry-standard op-amp
pin configurations. The MAX495 is also available in the
smallest 8-pin SO: the µMAX package.
____________________________Features
o
o
o
o
o
o
o
o
o
o
o
o
o
Low-Voltage Single-Supply Operation (+2.7V to +6V)
Rail-to-Rail Input Common-Mode Voltage Range
Rail-to-Rail Output Swing
500kHz Gain-Bandwidth Product
Unity-Gain Stable
150µA Max Quiescent Current per Op Amp
No Phase Reversal for Overdriven Inputs
200µV Offset Voltage
High Voltage Gain (108dB)
High CMRR (90dB) and PSRR (110dB)
Drives 1kΩ Load
Drives Large Capacitive Loads
MAX495 Available in µMAX Package—8-Pin SO
MAX492/MAX494/MAX495
______________Ordering Information
PART
MAX492CPA
MAX492CSA
MAX492C/D
MAX492EPA
MAX492ESA
MAX492MJA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP
________________________Applications
Portable Equipment
Battery-Powered Instruments
Data Acquisition
Signal Conditioning
Low-Voltage Applications
Ordering Information continued at end of data sheet.
*Dice
are specified at T
A
= +25°C, DC parameters only.
__________Typical Operating Circuit
_________________Pin Configurations
TOP VIEW
+5V
1
V
DD
10k
2
OUT1 1
IN1- 2
IN1+ 3
8
7
6
V
CC
OUT2
IN2-
IN2+
7
6
2
MAX187
(ADC)
AIN
V
EE
4
SERIAL
INTERFACE
NULL 1
4.096V
IN1- 2
IN1+ 3
V
EE
4
ANALOG
INPUT
10k
3
MAX495
4
DOUT 6
8
SCLK
7
CS
MAX492
DIP/SO
5
3
SHDN
4
REF
GND
5
8
N.C.
V
CC
OUT
NULL
MAX495
7
6
5
DIP/SO/µMAX
INPUT SIGNAL CONDITIONING FOR LOW-VOLTAGE ADC
Pin Configurations continued at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Single/Dual/Quad, Micropower,
Single-Supply Rail-to-Rail Op Amps
MAX492/MAX494/MAX495
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
to V
EE
) ....................................................7V
Common-Mode Input Voltage..........(V
CC
+ 0.3V) to (V
EE
- 0.3V)
Differential Input Voltage .........................................±(V
CC
- V
EE
)
Input Current (IN+, IN-, NULL1, NULL2) ..........................±10mA
Output Short-Circuit Duration ....................Indefinite short circuit
to either supply
Voltage Applied to NULL Pins ....................................V
CC
to V
EE
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 CERDIP (derate 8.00mW/°C above +70°C).........640mW
8-Pin µMAX (derate 4.1mW/°C above +70°C) ..............330mW
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)...800mW
14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C).......727mW
Operating Temperature Ranges
MAX49_C_ _ ........................................................0°C to +70°C
MAX49_E_ _......................................................-40°C to +85°C
MAX49_M_ _ ...................................................-55°C to +125°C
Junction Temperatures
MAX49_C_ _/E_ _..........................................................+150°C
MAX49_M_ _ .................................................................+175°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+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.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.7V to 6V, V
EE
= GND, V
CM
= 0V, V
OUT
= V
CC
/ 2, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Input Offset Voltage
Input Bias Current
Input Offset Current
Differential Input Resistance
Common-Mode Input
Voltage Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
CONDITIONS
V
CM
= V
EE
to V
CC
V
CM
= V
EE
to V
CC
V
CM
= V
EE
to V
CC
MIN
TYP
±200
±25
±0.5
2
V
EE
- 0.25
(V
EE
- 0.25V)
≤
V
CM
≤
(V
CC
+ 0.25V)
V
CC
= 2.7V to 6V
V
CC
= 2.7V,
R
L
= 100kΩ,
V
OUT
= 0.25V to 2.45V
V
CC
= 2.7V, R
L
= 1kΩ,
V
OUT
= 0.5V to 2.2V
V
CC
= 5.0V,
R
L
= 100kΩ,
V
OUT
= 0.25V to 4.75V
V
CC
= 5.0V, R
L
= 1kΩ,
V
OUT
= 0.5V to 4.5V
R
L
= 100kΩ
R
L
= 1kΩ
Output Short-Circuit Current
Operating Supply Voltage Range
Supply Current (per amplifier)
V
CM
= V
OUT
= V
CC
/ 2
V
CC
= 2.7V
V
CC
= 5V
2.7
135
150
Sourcing
Sinking
Sourcing
Sinking
Sourcing
Sinking
Sourcing
Sinking
V
OH
V
OL
V
OH
V
OL
V
CC
- 0.20
74
88
90
90
94
78
98
92
98
86
90
110
104
102
105
90
108
100
110
98
V
EE
+ 0.04 V
EE
+ 0.075
V
CC
- 0.15
V
EE
+ 0.15 V
EE
+ 0.20
30
6.0
150
170
mA
V
µA
dB
V
CC
+ 0.25
MAX
±500
±60
±6
UNITS
µV
nA
nA
MΩ
V
dB
dB
Large-Signal Voltage Gain
(Note 1)
V
CC
- 0.075 V
CC
- 0.04
V
Output Voltage Swing
(Note 1)
2
_______________________________________________________________________________________
Single/Dual/Quad, Micropower,
Single-Supply Rail-to-Rail Op Amps
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.7V to 6V, V
EE
= GND, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Gain-Bandwidth Product
Phase Margin
Gain Margin
Total Harmonic Distortion
Slew Rate
Time
Turn-On Time
Input Noise-Voltage Density
Input Noise-Current Density
Amp-Amp Isolation
CONDITIONS
R
L
= 100kΩ, C
L
= 100pF
R
L
= 100kΩ, C
L
= 100pF
R
L
= 100kΩ, C
L
= 100pF
R
L
= 10kΩ, C
L
= 15pF, V
OUT
= 2V
p-p
, A
V
= +1, f = 1kHz
R
L
= 100kΩ, C
L
= 15pF
To 0.1%, 2V step
V
CC
= 0V to 3V step, V
IN
= V
CC
/ 2, A
V
= +1
f = 1kHz
f = 1kHz
f = 1kHz
MIN
TYP
500
60
10
0.003
0.20
12
5
25
0.1
125
MAX
UNITS
kHz
degrees
dB
%
V/µs
µs
µs
nV/√Hz
pA/√Hz
dB
MAX492/MAX494/MAX495
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.7V to 6V, V
EE
= GND, V
CM
= 0V, V
OUT
= V
CC
/ 2, T
A
= 0°C to +70°C, unless otherwise noted.)
PARAMETER
Input Offset Voltage
Input Offset Voltage Tempco
Input Bias Current
Input Offset Current
Common-Mode Input
Voltage Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
V
CM
= V
EE
to V
CC
V
CM
= V
EE
to V
CC
V
EE
- 0.20
(V
EE
- 0.20)
≤
V
CM
≤
(V
CC
+ 0.20)
V
CC
= 2.7V to 6V
V
CC
= 2.7V, R
L
= 100kΩ,
V
OUT
= 0.25V to 2.45V
Large-Signal Voltage Gain
(Note 1)
V
CC
= 2.7V, R
L
= 1kΩ,
V
OUT
= 0.5V to 2.2V
V
CC
= 5.0V, R
L
= 100kΩ,
V
OUT
= 0.25V to 4.75V
V
CC
= 5.0V, R
L
= 1kΩ,
V
OUT
= 0.5V to 4.5V
Output Voltage Swing
(Note 1)
Operating Supply Voltage Range
Supply Current (per amplifier)
V
CM
= V
OUT
= V
CC
/ 2
V
CC
= 2.7V
V
CC
= 5V
R
L
= 100kΩ
R
L
= 1kΩ
Sourcing
Sinking
Sourcing
Sinking
Sourcing
Sinking
Sourcing
Sinking
V
OH
V
OL
V
OH
V
OL
2.7
V
CC
- 0.20
V
EE
+ 0.20
6.0
175
190
V
µA
72
86
88
84
92
76
92
88
96
82
V
CC
- 0.075
V
EE
+ 0.075
V
dB
V
CM
= V
EE
to V
CC
±2
±75
±6
V
CC
+ 0.20
CONDITIONS
MIN
TYP
MAX
±650
UNITS
µV
µV/°C
nA
nA
V
dB
dB
_______________________________________________________________________________________
3
Single/Dual/Quad, Micropower,
Single-Supply Rail-to-Rail Op Amps
MAX492/MAX494/MAX495
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.7V to 6V, V
EE
= GND, V
CM
= 0V, V
OUT
= V
CC
/ 2, T
A
= -40°C to +85°C, unless otherwise noted.)
PARAMETER
Input Offset Voltage
Input Offset Voltage Tempco
Input Bias Current
Input Offset Current
Common-Mode Input
Voltage Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
V
CM
= V
EE
to V
CC
V
CM
= V
EE
to V
CC
V
EE
- 0.15
(V
EE
- 0.15)
≤
V
CM
≤
(V
CC
+ 0.15)
V
CC
= 2.7V to 6V, V
CM
= 0V
V
CC
= 2.7V, R
L
= 100kΩ,
V
OUT
= 0.25V to 2.45V
V
CC
= 2.7V, R
L
= 1kΩ,
V
OUT
= 0.5V to 2.2V
V
CC
= 5.0V, R
L
= 100kΩ,
V
OUT
= 0.25V to 4.75V
V
CC
= 5.0V, R
L
= 1kΩ,
V
OUT
= 0.5V to 4.5V
R
L
= 100kΩ
R
L
= 1kΩ
Operating Supply-Voltage Range
Supply Current (per amplifier)
V
CM
= V
OUT
= V
CC
/ 2
V
CC
= 2.7V
V
CC
= 5V
Sourcing
Sinking
Sourcing
Sinking
Sourcing
Sinking
Sourcing
Sinking
V
OH
V
OL
V
OH
V
OL
2.7
V
CC
- 0.20
V
EE
+ 0.20
6.0
185
200
V
µA
68
84
86
84
92
76
92
86
96
80
V
CC
- 0.075
V
EE
+ 0.075
V
dB
V
CM
= V
EE
to V
CC
±2
±100
±8
V
CC
+ 0.15
CONDITIONS
MIN
TYP
MAX
±950
UNITS
µV
µV/°C
nA
nA
V
dB
dB
Large-Signal Voltage Gain
(Note 1)
Output Voltage Swing
(Note 1)
4
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