Rainbow Electronics MAX495 User Manual

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 VCCto VEE,
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 appli­cations. 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.

________________________Applications

Portable Equipment
Battery-Powered Instruments
Data Acquisition
Signal Conditioning
Low-Voltage Applications

____________________________Features

♦ 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

______________Ordering Information

PART

MAX492CPA

MAX492CSA
MAX492C/D 0°C to +70°C
MAX492EPA
MAX492ESA -40°C to +85°C
MAX492MJA -55°C to +125°C 8 CERDIP

Ordering Information continued at end of data sheet.

*

Dice are specified at TA = +25°C, DC parameters only.

TEMP. RANGE PIN-PACKAGE

0°C to +70°C
0°C to +70°C

-40°C to +85°C 8 Plastic DIP

8 Plastic DIP
8 SO
Dice*

8 SO

MAX492/MAX494/MAX495

__________Typical Operating Circuit

+5V

10k

2

7

6

2

MAX495

ANALOG

INPUT

3

4

10k

INPUT SIGNAL CONDITIONING FOR LOW-VOLTAGE ADC

________________________________________________________________

AIN

1

V

DD

MAX187

(ADC)

GND

5

DOUT

SCLK

CS

SHDN

REF

6
8
7

3
4

SERIAL
INTERFACE

4.096V

_________________Pin Configurations

TOP VIEW

OUT1

1

IN1-

2

IN1+

3

V

4

NULL

IN1-

IN1+

V

EE

EE

MAX492

DIP/SO

1

MAX495

2
3
4

DIP/SO/µMAX

Pin Configurations continued at end of data sheet.

Maxim Integrated Products

V

8

CC

OUT2

7

IN2-

6

IN2+

5

N.C.

8

V

CC

7

OUT

6

NULL

5

1

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone]

Single/Dual/Quad, Micropower,
Single-Supply Rail-to-Rail Op Amps

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (VCCto VEE)....................................................7V

Common-Mode Input Voltage..........(V

Differential Input Voltage .........................................±(V

Input Current (IN+, IN-, NULL1, NULL2)..........................±10mA

Output Short-Circuit Duration ....................Indefinite short circuit

Voltage Applied to NULL Pins....................................V

Continuous Power Dissipation (TA= +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

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.

+ 0.3V) to (VEE- 0.3V)

CC

CC

to either supply

CC

- VEE)

to V

EE

DC ELECTRICAL CHARACTERISTICS

(VCC= 2.7V to 6V, VEE= GND, VCM= 0V, V

OUT

= V

/ 2, TA= +25°C, unless otherwise noted.)

CC

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

CONDITIONS

VCM= VEEto V

Input Bias Current

MAX492/MAX494/MAX495

Common-Mode Input
Voltage Range

Common-Mode Rejection Ratio dB

Large-Signal Voltage Gain
(Note 1)

Output Voltage Swing
(Note 1)

Supply Current (per amplifier)

VCM= VEEto V

= VEEto V

V

CM

(VEE- 0.25V) ≤ VCM≤ (VCC+ 0.25V)
VCC= 2.7V to 6V

VCC= 2.7V,

= 100kΩ,

R

L

= 0.25V to 2.45V

V

OUT

VCC= 2.7V, RL= 1kΩ,
V

= 0.5V to 2.2V

OUT

VCC= 5.0V,

= 100kΩ,

R

L

= 0.25V to 4.75V

V

OUT

VCC= 5.0V, RL= 1kΩ,
V

= 0.5V to 4.5V

OUT

RL= 100kΩ

RL= 1kΩ

VCM= V

OUT

= V

CC
CC
CC

CC

74 90

Sourcing
Sinking
Sourcing
Sinking 78 90
Sourcing
Sinking 92 100
Sourcing
Sinking 86 98
V

OH

V

OL

V

OH

V

OL

VCC= 2.7V

/ 2

VCC= 5V

90 104
90 102
94 105

98 108

98 110

VCC- 0.075 VCC- 0.04

VCC- 0.20 VCC- 0.15

VEE+ 0.04 VEE+ 0.075

VEE+ 0.15 VEE+ 0.20

135 150
150 170

UNITSMIN TYP MAXPARAMETER

µV±200 ±500Input Offset Voltage
nA±25 ±60
nA±0.5 ±6Input Offset Current

MΩ2Differential Input Resistance

VVEE- 0.25 VCC+ 0.25

dB88 110Power-Supply Rejection Ratio

dB

V

mA30Output Short-Circuit Current

V2.7 6.0Operating Supply Voltage Range

µA

2 _______________________________________________________________________________________

Single/Dual/Quad, Micropower,

Single-Supply Rail-to-Rail Op Amps

AC ELECTRICAL CHARACTERISTICS

(VCC= 2.7V to 6V, VEE= GND, TA= +25°C, unless otherwise noted.)

CONDITIONS

RL= 100kΩ, CL= 100pF

Gain Margin

Turn-On Time

Input Noise-Current Density

RL= 100kΩ, CL= 100pF
RL= 100kΩ, CL= 100pF
RL= 10kΩ, CL= 15pF, V
RL= 100kΩ, CL= 15pF
To 0.1%, 2V step
VCC= 0V to 3V step, VIN= V
f = 1kHz
f = 1kHz
f = 1kHz dB125Amp-Amp Isolation

OUT

= 2V

p-p

/ 2, AV= +1

CC

60Phase Margin

, AV= +1, f = 1kHz

5

25Input Noise-Voltage Density

degrees

DC ELECTRICAL CHARACTERISTICS

(VCC= 2.7V to 6V, VEE= GND, VCM= 0V, V

VCM= VEEto V

Input Bias Current

Common-Mode Input
Voltage Range
Common-Mode Rejection Ratio dB

Power-Supply Rejection Ratio

Large-Signal Voltage Gain
(Note 1)

Output Voltage Swing
(Note 1)

Supply Current (per amplifier)

VCM= VEEto V
VCM= VEEto V

(VEE- 0.20) ≤ VCM≤ (VCC+ 0.20)
VCC= 2.7V to 6V

VCC= 2.7V, RL= 100kΩ,
V

OUT

VCC= 2.7V, RL= 1kΩ,
V

OUT

VCC= 5.0V, RL= 100kΩ,
V

OUT

VCC= 5.0V, RL= 1kΩ,
V

OUT

RL= 100kΩ

RL= 1kΩ

VCM= V

= V

OUT

= 0.25V to 2.45V

= 0.5V to 2.2V

= 0.25V to 4.75V

= 0.5V to 4.5V

OUT

/ 2, TA= 0°C to +70°C, unless otherwise noted.)

CC

CC

CC
CC

= V

/ 2

CC

CONDITIONS

Sourcing
Sinking
Sourcing
Sinking 76
Sourcing
Sinking 88
Sourcing
Sinking
V

OH

V

OL

V

OH

V

OL

VCC= 2.7V
VCC= 5V

72

88
84
92

92

96
82

VCC- 0.075

VEE+ 0.075

VCC- 0.20

VEE+ 0.20

175
190

MAX492/MAX494/MAX495

UNITSMIN TYP MAXPARAMETER

kHz500Gain-Bandwidth Product

dB10

%0.003Total Harmonic Distortion

V/µs0.20Slew Rate

µs12Time
µs

nV/√Hz

pA/√Hz0.1

UNITSMIN TYP MAXPARAMETER

µV±650Input Offset Voltage

µV/°C±2Input Offset Voltage Tempco

nA±75
nA±6Input Offset Current

VVEE- 0.20 VCC+ 0.20

dB86

dB

V

V2.7 6.0Operating Supply Voltage Range

µA

_______________________________________________________________________________________ 3

Single/Dual/Quad, Micropower,
Single-Supply Rail-to-Rail Op Amps

DC ELECTRICAL CHARACTERISTICS

(VCC= 2.7V to 6V, VEE= GND, VCM= 0V, V

VCM= VEEto V

Input Bias Current

Common-Mode Input
Voltage Range

Large-Signal Voltage Gain
(Note 1)

MAX492/MAX494/MAX495

Output Voltage Swing
(Note 1)

Operating Supply-Voltage Range 2.7 6.0 V
Supply Current (per amplifier) VCM= V

VCM= VEEto V
VCM= VEEto V

(VEE- 0.15) ≤ VCM≤ (VCC+ 0.15)
VCC= 2.7V to 6V, VCM= 0V

VCC= 2.7V, RL= 100kΩ,
V

OUT

VCC= 2.7V, RL= 1kΩ,
V

OUT

VCC= 5.0V, RL= 100kΩ,
V

OUT

VCC= 5.0V, RL= 1kΩ,
V

OUT

RL= 100kΩ

RL= 1kΩ

= V

OUT

= 0.25V to 2.45V

= 0.5V to 2.2V

= 0.25V to 4.75V

= 0.5V to 4.5V

OUT

/ 2, TA= -40°C to +85°C, unless otherwise noted.)

CC

CC

CC
CC

= VCC/ 2

CONDITIONS

Sourcing
Sinking
Sourcing
Sinking
Sourcing
Sinking
Sourcing
Sinking
V

OH

V

OL

V

OH

V

OL

VCC= 2.7V
VCC= 5V

±2Input Offset Voltage Tempco

68

86
84
92
76
92
86
96
80

VCC- 0.075

VEE+ 0.075

VCC- 0.20

VEE+ 0.20

185
200

UNITSMIN TYP MAXPARAMETER

µV±950Input Offset Voltage

µV/°C

nA±100
nA±8Input Offset Current

VVEE- 0.15 VCC+ 0.15

dBCommon-Mode Rejection Ratio
dB84Power-Supply Rejection Ratio

dB

V

µA

4 _______________________________________________________________________________________

Single/Dual/Quad, Micropower,

Single-Supply Rail-to-Rail Op Amps

DC ELECTRICAL CHARACTERISTICS

(VCC= 2.7V to 6V, VEE= GND, VCM= 0V, V

VCM= VEEto V

Input Bias Current

Power-Supply Rejection Ratio

Large-Signal Voltage Gain
(Note 1)

Output Voltage Swing
(Note 1)

Supply Current (per amplifier)

VCM= VEEto V
VCM= VEEto V

(VEE- 0.05V) ≤ VCM≤ (VCC+ 0.05V)
VCC= 2.7V to 6V

VCC= 2.7V, RL= 100kΩ,
V

OUT

VCC= 2.7V, RL= 1kΩ,
V

OUT

VCC= 5.0V, RL= 100kΩ,
V

OUT

VCC= 5.0V, RL= 1kΩ,
V

OUT

RL= 100kΩ

RL= 1kΩ

VCM= V

= V

OUT

CC

CC

CC
CC

= 0.25V to 2.45V

= 0.5V to 2.2V

= 0.25V to 4.75V

= 0.5V to 4.5V

= VCC/ 2

OUT

/ 2, TA= -55°C to +125°C, unless otherwise noted.)

CONDITIONS

66

Sourcing
Sinking
Sourcing
Sinking 72
Sourcing
Sinking 82
Sourcing
Sinking
V

OH

V

OL

V

OH

V

OL

VCC= 2.7V
VCC= 5V

82
80
90

86

94
76

VCC- 0.075

VCC- 0.250

±2Input Offset Voltage Tempco

VEE+ 0.075

VEE+ 0.250

200
225

MAX492/MAX494/MAX495

UNITSMIN TYP MAXPARAMETER

mV±1.2Input Offset Voltage

µV/°C

nA±200
nA±10Input Offset Current

VVEE- 0.05 VCC+ 0.05Common-Mode Input Voltage Range
dBCommon-Mode Rejection Ratio
dB80

dB

V

V2.7 6.0Operating Supply-Voltage Range
µA

Note 1: RLto VEEfor sourcing and VOHtests; RLto VCCfor sinking and VOLtests.

_______________________________________________________________________________________ 5