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Part Number MAX4246

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General Description
The MAX4245/MAX4246/MAX4247 family of low-cost
op amps offer Rail-to-Rail
®
inputs and outputs, draw
only 320µA of quiescent current, and operate from a
single +2.5V to +5.5V supply. For additional power con-
servation, the MAX4245/MAX4247 offer a low-power
shutdown mode that reduces supply current to 50nA,
and puts the amplifiers' outputs in a high-impedance
state. These devices are unity-gain stable with a 1MHz
gain-bandwidth product driving capacitive loads up to
470pF.
The MAX4245/MAX4246/MAX4247 family is specified
from -40
°C to +125°C, making them suitable for use in
a variety of harsh environments, such as automotive
applications. The MAX4245 single amplifier is available
in ultra-small 6-pin SC70 and space-saving 6-pin
SOT23 packages. The MAX4246 dual amplifier is avail-
able in 8-pin SOT23 and µMAX packages. The
MAX4247 dual amplifier comes in a tiny 10-pin µMAX
package.
Applications
Portable Communications
Single-Supply Zero-Crossing Detectors
Instruments and Terminals
Electronic Ignition Modules
Infrared Receivers
Sensor-Signal Detection
Features
o Rail-to-Rail Input and Output Voltage Swing
o 50nA (max) Shutdown Mode (MAX4245/MAX4247)
o 320µA (typ) Quiescent Current Per Amplifier
o Single +2.5V to +5.5V Supply Voltage Range
o 110dB Open-Loop Gain with 2k Load
o 0.01% THD with 100k Load
o Unity-Gain Stable up to C
LOAD
= 470pF
o No Phase Inversion for Overdriven Inputs
o Available in Space-Saving Packages
6-Pin SC70 or 6-Pin SOT23 (MAX4245)
8-Pin SOT23 or 8-Pin µMAX (MAX4246)
10-Pin µMAX (MAX4247)
MAX4245/MAX4246/MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
________________________________________________________________ Maxim Integrated Products
1
Pin Configurations
Ordering Information
19-2016; Rev 0; 5/01
Pin Configurations continued at end of data sheet.
PART
TEMP. RANGE
PIN-
PACKAGE
TOP
MARK
MAX4245AXT-T -40°C to +125°C
6 SC70-6
AAZ
MAX4245AUT-T -40°C to +125°C
6 SOT23-6
AAUB
MAX4246AKA-T -40°C to +125°C
8 SOT23-8
AAIN
MAX4246AUA
-40°C to +125°C
8 µMAX
--
MAX4247AUB
-40°C to +125°C
10 µMAX
--
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
Selector Guide
PART
AMPLIFIERS
PER PACKAGE
SHUTDOWN
MODE
MAX4245AXT-T
1
Yes
MAX4245AUT-T
1
Yes
MAX4246AKA-T
2
No
MAX4246AUA
2
No
MAX4247AUB
2
Yes
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.
V
SS
OUT
IN-
1
6
V
DD
5
IN+
MAX4245
SC70-6/SOT23-6
TOP VIEW
2
3
4
1
2
3
4
8
7
6
5
V
DD
OUTB
INB-
INB+
V
SS
INA+
INA-
OUTA
MAX4246
SOT23-8/
µMAX-8
SHDN
MAX4245/MAX4246/MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V, V
SS
= 0, V
CM
= 0, V
OUT
= V
DD
/2, R
L
connected from OUT to V
DD
/2, SHDN_ = V
DD
(MAX4245/MAX4247 only),
T
A
= +25°C, unless otherwise noted.) (Note 1)
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.
Power Supply Voltage (V
DD
to V
SS
) .........................-0.3V to +6V
All Other Pins ...................................(V
SS
- 0.3V) to (V
DD
+ 0.3V)
Output Short-Circuit Duration
(OUT shorted to V
SS
or V
DD
)................................. Continuous
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C) ..............245mW
6-Pin SOT23 (derate 8.7mW/°C above +70°C)............695mW
8-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
V
DD
Inferred from PSRR test
2.5
5.5
V
V
DD
= +2.7V
320
650
Supply Current (Per Amplifier)
I
DD
V
DD
= +5.5V
375
700
µA
Supply Current in Shutdown
I
SHDN_
SHDN_ = V
SS
(Note 2)
0.05
0.5
µA
Input Offset Voltage
V
OS
V
SS
- 0.1V
V
CM
V
DD
+ 0.1V
±0.4
±1.5
mV
Input Bias Current
I
B
V
SS
- 0.1V
V
CM
V
DD
+ 0.1V
±10
±50
nA
Input Offset Current
I
OS
V
SS
- 0.1V
V
CM
V
DD
+ 0.1V
±1
±6
nA
Input Resistance
R
IN
|V
IN+
- V
IN-
|
10mV
4000
k
Input Common-Mode Voltage
Range
V
CM
Inferred from CMRR test
V
S S
- 0.1
V
D D
+ 0.1
V
Common-Mode Rejection Ratio
CMRR
V
SS
- 0.1V
V
CM
V
DD
+ 0.1V
65
80
dB
Power-Supply Rejection Ratio
PSRR
2.5V
V
DD
5.5V
75
90
dB
V
SS
+ 0.05V
V
OUT
V
DD
- 0.05V,
R
L
= 100k
120
Large-Signal Voltage Gain
A
V
V
SS
+ 0.2V
V
OUT
V
DD
- 0.2V, R
L
= 2k
95
110
dB
R
L
= 100k
1
Output Voltage Swing High
V
OH
Specified as
V
DD
- V
OUT
R
L
= 2k
35
60
mV
R
L
= 100k
1
Output Voltage Swing Low
V
OL
Specified as
V
OUT
- V
SS
R
L
= 2k
30
60
mV
Sourcing
11
Output Short-Circuit Current
I
OUT(SC)
V
DD
= +5.0V
Sinking
30
mA
Output Leakage Current in
Shutdown
I
OUT(SH)
Device in Shutdown Mode
(
SHDN_ = V
SS
), V
SS
V
OUT
V
DD
(Note 2)
±0.01
±0.5
µA
SHDN_ Logic Low
V
IL
(Note 2)
0.3 x V
DD
V
SHDN_ Logic High
V
IH
(Note 2)
0.7 x V
D D
V
SHDN_ Input Current
I
L
/I
H
V
SS
SHDN_ V
DD
(Note 2)
0.5
50
nA
MAX4245/MAX4246/MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V, V
SS
= 0, V
CM
= 0, V
OUT
= V
DD
/2, R
L
connected from OUT to V
DD
/2, SHDN_ = V
DD
(MAX4245/MAX4247 only),
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Gain-Bandwidth Product
GBW
1.0
MHz
Phase Margin
M
70
degrees
Gain Margin
G
M
20
dB
Slew Rate
SR
0.4
V/
µs
Input Voltage Noise Density
e
n
f = 10kHz
52
nV/
Hz
Input Current Noise Density
i
n
f = 10kHz
0.1
pA/
Hz
Capacitive-Load Stability
C
LOAD
A
V
= 1 (Note 3)
470
pF
Shutdown Delay Time
t
(SH)
(Note 2)
3
µs
Enable Delay Time
t
(EN)
(Note 2)
4
µs
Power-On Time
t
ON
4
µs
Input Capacitance
C
IN
2.5
pF
Total Harmonic Distortion
THD
f = 10kHz, V
OUT
= 2Vp-p, A
V
= +1,
V
DD
= +5.0V, Load = 100k
to V
DD
/2
0.01
%
Settling Time to 0.01%
t
S
V
OUT
= 4V step, V
DD
= +5.0V, A
V
= +1
10
µs
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V, V
SS
= 0, V
CM
= 0, V
OUT
= V
DD
/2, R
L
connected from OUT to V
DD
/2, SHDN_ = V
DD
(MAX4245/MAX4247 only),
T
A
= -40°C to +125°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
V
DD
Inferred from PSRR test
2.5
5.5
V
Supply Current (Per Amplifier)
I
DD
V
DD
= +2.7V
800
µA
Supply Current in Shutdown
I
SHDN_
SHDN_ = V
SS
(Note 2)
1
µA
Input Offset Voltage
V
OS
V
SS
V
CM
V
DD
(Note 4)
±3.0
mV
Input Offset Voltage Drift
TCV
OS
V
SS
V
CM
V
DD
(Note 4)
±2
µV/°C
Input Bias Current
I
B
V
SS
V
CM
V
DD
(Note 4)
±100
nA
Input Offset Current
I
OS
V
SS
V
CM
V
DD
(Note 4)
±10
nA
Input Common-Mode Voltage
Range
V
CM
Inferred from CMRR test (Note 4)
V
SS
V
DD
V
Common-Mode Rejection Ratio
CMRR
V
SS
V
CM
V
DD
(Note 4)
60
dB
Power-Supply Rejection Ratio
PSRR
2.5V
V
DD
5.5V
70
dB
Large-Signal Voltage Gain
A
V
V
SS
+ 0.2V
V
OUT
V
DD
- 0.2V,
R
L
= 2k
85
dB
Output Voltage Swing High
V
OH
Specified as V
DD
- V
OUT
, R
L
= 2k
90
mV
Output Voltage Swing Low
V
OL
Specified as V
OUT
- V
SS
, R
L
= 2k
90
mV
Output Leakage Current in
Shutdown
I
OUT(SH)
Device in Shutdown Mode (
SHDN_ = V
SS
),
V
SS
V
OUT
V
DD
(Note 3)
±1.0
µA
MAX4245/MAX4246/MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V, V
SS
= 0, V
CM
= 0, V
OUT
= V
DD
/2, R
L
connected from OUT to V
DD
/2, SHDN_ = V
DD
(MAX4245/MAX4247 only),
T
A
= -40°C to +125°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SHDN_ Logic Low
V
IL
(Note 2)
0.3
V
D D
V
SHDN_ Logic High
V
IH
(Note 2)
0.7
V
D D
V
SHDN_ Input Current
I
L
/I
H
V
SS
SHDN_ V
DD
(Notes 2, 3)
100
nA
Note 1: Specifications are 100% tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Note 2: Shutdown mode is only available in MAX4245 and MAX4247.
Note 3: Guaranteed by design, not production tested.
Note 4: For -40°C to +85°C, Input Common Mode Range is V
SS
- 0.1V
V
CM
V
DD
+ 0.1V
Typical Operating Characteristics
(V
DD
= 2.7V, V
SS
= V
CM
= 0, V
OUT
= V
DD
/2, no load, T
A
= +25°C, unless otherwise noted.)
200
300
250
400
350
450
500
2.0
3.5
4.0
2.5
3.0
4.5
5.0
5.5
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
MAX4245 toc01
V
DD
(V)
I
DD
(
µ
A)
T
A
= +125
°C
T
A
= +85
°C
T
A
= +25
°C
T
A
= -40
°C
0
40
120
80
160
200
MAX4245/MAX4247
SHUTDOWN SUPPLY CURRENT
PER AMPLIFIER vs. TEMPERATURE
MAX4245 toc02
TEMPERATURE (
°C)
I
SHDN
(nA)
-40
70
15
125
0
200
100
400
300
500
600
0
1.0
0.5
1.5
2.0
2.5
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX4245 toc03
V
CM
(V)
V
OS
(
µ
V)
V
DD
= 2.5V
T
A
=
+125
°C
T
A
=
+85
°C
T
A
=
+25
°C
T
A
=
-40
°C
0
200
100
400
300
500
600
0
2
3
1
4
5
6
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX4245 toc04
V
CM
(V)
V
OS
(
µ
V)
V
DD
= 5.5V
T
A
=
-40
°C
T
A
=
+25
°C
T
A
=
+85
°C
T
A
=
+125
°C
0
100
50
200
150
300
250
350
-40
15
70
125
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX4245 toc05
TEMPERATURE (
°C)
V
OS
(
µ
V)
V
DD
= 2.5V
V
DD
= 5.5V
-15
-5
-10
5
0
15
10
20
0
2
3
1
4
5
6
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
MAX4245 toc06
V
CM
(V)
I
BIAS
(nA)
T
A
= -40
°C
T
A
= +25
°C
T
A
= +125
°C
V
DD
= 5.5V
T
A
= +85
°C
MAX4245/MAX4246/MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
_______________________________________________________________________________________
5
0
4
2
8
6
12
10
14
0
1.0 1.5 2.0
0.5
2.5 3.0 3.5 4.0 4.5 5.0 5.5
OUTPUT SOURCE CURRENT
vs. OUTPUT VOLTAGE
MAX4245 toc07
V
OUT
(V)
I
SOURCE
(mA)
V
DD
= 5.5V
V
DD
= 2.5V
0
10
5
25
20
15
30
35
45
40
50
0
1.0 1.5
0.5
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
OUTPUT SINK CURRENT
vs. OUTPUT VOLTAGE
MAX4245 toc08
V
OUT
(V)
I
SINK
(mA)
V
DD
= 2.5V
V
DD
= 5.5V
0
10
30
20
40
OUTPUT SWING HIGH
vs. TEMPERATURE
MAX4245 toc09
TEMPERATURE (
°C)
V
DD
- V
OUT
(mV)
-40
70
15
125
R
L
= 2k
R
L
= 100k
0
10
30
20
40
OUTPUT SWING LOW
vs. TEMPERATURE
MAX4245 toc10
TEMPERATURE (
°C)
V
OUT
- V
SS
(mV)
-40
70
15
125
R
L
= 2k
R
L
= 100k
0.001
10
1000
0.1
0.01
1
100
10,000
CROSSTALK vs. FREQUENCY
MAX4245 toc11
FREQUENCY (kHz)
CROSSTALK (dB)
-130
-110
-90
-70
-50
0
-100
0.1
10
10
100
1000
10,000
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-80
MAX4245 toc12
FREQUENCY (kHz)
PSRR (dB)
-60
-40
-20
-90
-70
-50
-30
-10
100
1000
100,000
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. INPUT FREQUENCY
MAX4245 toc13
INPUT FREQUENCY (Hz)
THD + N (%)
1
0.1
0.0001
0.01
0.001
10,000
R
L
= 100k
A
V
= +1
V
OUT
= 2V
p-p
V
DD
= 5.0V
10
0
1
2
3
4
5
1
0.1
0.01
0.001
0.0001
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. AMPLITUDE
MAX4245 toc14
OUTPUT VOLTAGE (V
P-P
)
THD + N (%)
R
L
= 100k
A
V
= +1
f
IN
= 1kHz
V
DD
= 5.0V
80
0.1
1
10
100
1000
10,000
40
20
0
-20
-40
GAIN AND PHASE vs. FREQUENCY
MAX4245 toc15
FREQUENCY (kHz)
GAIN (dB)
60
90
-30
-90
-150
-210
-270
30
PHASE
GAIN
NO LOAD
Typical Operating Characteristics (continued)
(V
DD
= 2.7V, V
SS
= V
CM
= 0, V
OUT
= V
DD
/2, no load, T
A
= +25°C, unless otherwise noted.)