19-2137; Rev 3; 9/05
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
General Description
The MAX4475–MAX4478/MAX4488/MAX4489 wide-
band, low-noise, low-distortion operational amplifiers
offer rail-to-rail outputs and single-supply operation
down to 2.7V. They draw 2.2mA of quiescent supply
current per amplifier while featuring ultra-low distortion
(0.0002% THD+N), as well as low input voltage-noise
density (4.5nV/√Hz) and low input current-noise density
(0.5fA/√Hz). These features make the devices an ideal
choice for applications that require low distortion and/or
low noise.
For power conservation, the MAX4475/MAX4488 offer a
low-power shutdown mode that reduces supply current
to 0.01µA and places the amplifiers’ outputs into a high-
impedance state. These amplifiers have outputs which
swing rail-to-rail and their input common-mode voltage
range includes ground. The MAX4475–MAX4478 are
unity-gain stable with a gain-bandwidth product of
10MHz. The MAX4488/4489 are internally compensated
for gains of +5V/V or greater with a gain-bandwidth
product of 42MHz. The single MAX4475/MAX4476/
MAX4488 are available in space-saving, 6-pin SOT23
and TDFN packages.
♦
♦
♦
♦
♦
♦
♦
♦
♦
Features
Low Input Voltage-Noise Density: 4.5nV/√Hz
Low Input Current-Noise Density: 0.5fA/√Hz
Low Distortion: 0.0002% THD+N (1kΩ load)
Single-Supply Operation from +2.7V to +5.5V
Input Common-Mode Voltage Range Includes
Ground
Rail-to-Rail Output Swings with a 1kΩ Load
10MHz GBW Product, Unity-Gain Stable
(MAX4475–MAX4478)
42MHz GBW Product, Stable with A
V
≥
+5V/V
(MAX4488/MAX4489)
Excellent DC Characteristics
V
OS
= 70µV
I
BIAS
= 1pA
Large-Signal Voltage Gain = 120dB
Low-Power Shutdown Mode:
Reduces Supply Current to 0.01µA
Places Output in High-Impedance State
Available in Space-Saving SOT23, TDFN, µMAX
®
,
and TSSOP Packages
MAX4475–MAX4478/MAX4488/MAX4489
♦
Applications
ADC Buffers
DAC Output Amplifiers
Low-Noise Microphone/Preamplifiers
Digital Scales
Strain Gauges/Sensor Amplifiers
Medical Instrumentation
µMAX is a registered trademark of Maxim Integrated Products, Inc.
♦
Ordering Information
PART
MAX4475AUT-T
MAX4475AUA
MAX4475ASA
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-
PACKAGE
6 SOT23-6
8 µMAX
8 SO
TOP
MARK
AAZV
—
—
+ADD
Typical Operating Characteristic
INPUT VOLTAGE-NOISE DENSITY
vs. FREQUENCY
V
IN
EQUIVALENT INPUT NOISE VOLTAGE (nV/√Hz)
MAX4475 toc20
MAX4475ATT+T -40°C to +125°C 6 TDFN-EP*
+Denotes
lead-free package.
*EP
= Exposed paddle (connect to V
SS
).
Ordering Information continued at end of data sheet.
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
25
20
Selector Guide
PART
MAX4475
MAX4476
MAX4477
MAX4478
MAX4488
MAX4489
GAIN BW
(MHz)
10
10
10
10
42
42
STABLE
GAIN
(V/V)
1
1
1
1
5
5
NO. OF
AMPS
1
1
2
4
1
2
SHDN
Yes
—
—
—
Yes
—
15
10
5
0
10
100
1k
FREQUENCY (Hz)
10k
100k
________________________________________________________________
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.
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
MAX4475–MAX4478/MAX4488/MAX4489
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (V
DD
to V
SS
) ......................-0.3V to +6.0V
Analog Input Voltage (IN_+, IN_-)....(V
SS
- 0.3V) to (V
DD
+ 0.3V)
SHDN
Input Voltage....................................(V
SS
- 0.3V) to +6.0V
Output Short-Circuit Duration to Either Supply ..........Continuous
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 9.1mW/°C above +70°C)...........727mW
6-Pin TDFN (derate 18.2mW/°C above 70°C) ...........1454mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) ............362mW
8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) .........727mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°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.
DC ELECTRICAL CHARACTERISTICS
(V
DD
= +5V, V
SS
= 0V, V
CM
= 0V, V
OUT
= V
DD
/2, R
L
tied to V
DD
/2,
SHDN
= V
DD
, T
A
= -40°C to +125°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
Supply Voltage Range
Quiescent Supply Current Per
Amplifier
Input Offset Voltage
Input Offset Voltage Tempco
Input Bias Current
Input Offset Current
Differential Input Resistance
Input Common-Mode Voltage
Range
SYMBOL
V
DD
I
D
(Note 3)
Normal mode
V
DD
= 3V
V
DD
= 5V
CONDITIONS
MIN
2.7
2.2
2.5
0.01
±70
±0.3
(Note 4)
(Note 4)
Guaranteed by
CMRR Test
(V
SS
- 0.2V)
≤
V
CM
≤
(V
DD
-
1.6V)
(V
SS
- 0.1V)
≤
V
CM
≤
(V
DD
-
1.7V)
V
DD
= 2.7 to 5.5V
R
L
= 10kΩ to V
DD
/2;
V
OUT
= 100mV to (V
DD
- 125mV)
Large-Signal Voltage Gain
A
VOL
R
L
= 1kΩ to V
DD
/2;
V
OUT
= 200mV to (V
DD
- 250mV)
R
L
= 500Ω to V
DD
/2;
V
OUT
= 350mV to (V
DD
- 500mV)
T
A
= +25
°
C
T
A
= -40
°
C to +125
°
C
T
A
= +25
°
C
-0.2
-0.1
90
115
dB
T
A
= -40
°
C to +125
°
C
90
90
90
85
85
120
120
110
110
dB
dB
±1
±1
1000
V
DD
- 1.6
V
DD
- 1.7
4.4
1.0
±350
±750
±6
±150
±150
TYP
MAX
5.5
UNITS
V
mA
µA
µV
µV/°C
pA
pA
GΩ
V
Shutdown mode (SHDN = V
SS
) (Note 2)
V
OS
TC
VOS
I
B
I
OS
R
IN
V
CM
T
A
= +25
°
C
T
A
= -40
°
C to +125
°
C
Common-Mode Rejection Ratio
CMRR
Power-Supply Rejection Ratio
PSRR
2
_______________________________________________________________________________________
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
DC ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V, V
SS
= 0V, V
CM
= 0V, V
OUT
= V
DD
/2, R
L
tied to V
DD
/2,
SHDN
= V
DD
, T
A
= -40°C to +125°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
|V
IN+
- V
IN-
|
≥
10mV,
R
L
= 10kΩ to V
DD
/2
Output Voltage Swing
V
OUT
|V
IN+
- V
IN-
|
≥
10mV,
R
L
= 1kΩ to V
DD
/2
|V
IN+
- V
IN-
|
≥
10mV,
R
L
= 500Ω to V
DD
/2
Output Short-Circuit Current
Output Leakage Current
SHDN
Logic Low
SHDN
Logic High
SHDN
Input Current
Input Capacitance
C
IN
I
SC
I
LEAK
V
IL
V
IH
SHDN
= V
SS
to V
DD
0.7 x V
DD
0.01
10
1
Shutdown mode (SHDN = V
SS
),
V
OUT
= V
SS
to V
DD
V
DD
- V
OH
V
OL
- V
SS
V
DD
- V
OH
V
OL
- V
SS
V
DD
- V
OH
V
OL
- V
SS
MIN
TYP
10
10
80
50
100
80
48
±0.001
±1.0
0.3 x V
DD
MAX
45
40
200
150
300
250
mA
µA
V
V
µA
pF
mV
UNITS
MAX4475–MAX4478/MAX4488/MAX4489
AC ELECTRICAL CHARACTERISTICS
(V
DD
= +5V, V
SS
= 0V, V
CM
= 0V, V
OUT
= V
DD
/2, R
L
tied to V
DD
/2,
SHDN
= V
DD
, T
A
= +25°C.)
PARAMETER
Gain-Bandwidth Product
Slew Rate
Full-Power Bandwidth (Note 5)
Peak-to-Peak Input Noise Voltage
e
n(P-P)
SYMBOL
GBWP
SR
CONDITIONS
MAX4475–MAX4478
MAX4488/MAX4489
MAX4475–MAX4478
MAX4488/MAX4489
MAX4475–MAX4478
MAX4488/MAX4489
f = 0.1Hz to 10Hz
f = 10Hz
Input Voltage-Noise Density
Input Current-Noise Density
e
n
i
n
f = 1kHz
f = 30kHz
f = 1kHz
V
OUT
= 2V
P-P
,
A
V
= +1V/V
(MAX4475–MAX4478),
R
L
= 10kΩ to GND
V
OUT
= 2V
P-P
,
A
V
= +1V/V
(MAX4475–MAX4478),
R
L
= 1kΩ to GND
V
OUT
= 2V
P-P
,
A
V
= +5V/V
(MAX4488/MAX4489),
R
L
= 10kΩ to GND
f = 1kHz
f = 20kHz
f = 1kHz
f = 20kHz
f = 1kHz
f = 20kHz
A
V
= +1V/V
A
V
= +5V/V
A
V
= +1V/V
A
V
= +5V/V
A
V
= +1V/V
A
V
= +5V/V
MIN
TYP
10
42
3
10
0.4
1.25
260
21
4.5
3.5
0.5
0.0002
0.0007
0.0002
0.001
0.0004
0.0006
%
fA/√Hz
nV/√Hz
MAX
UNITS
MHz
V/µs
MHz
nV
P-P
Total Harmonic Distortion Plus
Noise (Note 6)
THD + N
_______________________________________________________________________________________
3
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
MAX4475–MAX4478/MAX4488/MAX4489
AC ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V, V
SS
= 0V, V
CM
= 0V, V
OUT
= V
DD
/2, R
L
tied to V
DD
/2,
SHDN
= V
DD
, T
A
= +25°C.)
PARAMETER
Total Harmonic Distortion Plus
Noise (Note 6)
Capacitive-Load Stability
Gain Margin
Phase Margin
Settling Time
Delay Time to Shutdown
Enable Delay Time from Shutdown
Power-Up Delay Time
t
SH
t
EN
V
OUT
= 2.5V, V
OUT
settles to 0.1%
V
DD
= 0 to 5V step, V
OUT
stable to 0.1%
GM
ΦM
MAX4475–MAX4478, A
V
= +1V/V
MAX4488/MAX4489, A
V
= +5V/V
To 0.01%, V
OUT
= 2V step
SYMBOL
CONDITIONS
V
OUT
= 2V
P-P
,
A
V
= +5V/V
(MAX4488/MAX4489),
R
L
= 1kΩ to GND
No sustained oscillations
f = 1kHz
f = 20kHz
MIN
TYP
0.0005
%
0.008
200
12
70
80
2
1.5
10
13
pF
dB
degrees
µs
µs
µs
µs
MAX
UNITS
THD + N
All devices are 100% tested at T
A
= +25°C. Limits over temperature are guaranteed by design.
SHDN
is available on the MAX4475/MAX4488 only.
Guaranteed by the PSRR test.
Guaranteed by design.
Full-power bandwidth for unity-gain stable devices (MAX4475–MAX4478) is measured in a closed-loop gain of +2V/V to
accommodate the input voltage range, V
OUT
= 4V
P-P
.
Note 6:
Lowpass-filter bandwidth is 22kHz for f = 1kHz and 80kHz for f = 20kHz. Noise floor of test equipment = 10nV/√Hz.
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Typical Operating Characteristics
(V
DD
= +5V, V
SS
= 0V, V
CM
= 0V, V
OUT
= V
DD
/2, R
L
tied to V
DD
/2, input noise floor of test equipment =10nV/√Hz for all distortion
measurements, T
A
= +25°C, unless otherwise noted.)
INPUT OFFSET VOLTAGE DISTRIBUTION
MAX4475-8 toc1
OFFSET VOLTAGE vs. TEMPERATURE
MAX4475 toc02
INPUT OFFSET VOLTAGE
vs. INPUT COMMON-MODE VOLTAGE
MAX4475 toc03
18
16
PERCENTAGE OF UNITS (%)
14
12
10
8
6
4
2
0
-50 -40 -30 -20 -10 0 10 20 30 40 50
V
OS
(µV)
250
200
INPUT OFFSET VOLTAGE (µV)
150
100
50
0
-50
-100
-150
-200
-250
-50
V
COM
= 0V
50
INPUT OFFSET VOLTAGE (µV)
40
30
20
V
DD
= 3V
10
0
V
DD
= 5V
-25
0
25
50
75
100
125
-0.5
0.5
1.5
2.5
3.5
4.5
TEMPERATURE (°C)
INPUT COMMON-MODE VOLTAGE (V)
4
_______________________________________________________________________________________
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
MAX4475–MAX4478/MAX4488/MAX4489
Typical Operating Characteristics (continued)
(V
DD
= +5V, V
SS
= 0V, V
CM
= 0V, V
OUT
= V
DD
/2, R
L
tied to V
DD
/2, input noise floor of test equipment =10nV/√Hz for all distortion
measurements, T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. OUTPUT LOAD CURRENT
MAX4475 toc04
OUTPUT VOLTAGE SWING (V
OH
)
vs. TEMPERATURE
MAX4475 toc05
OUTPUT VOLTAGE SWING (V
OL
)
vs. TEMPERATURE
MAX4475 toc06
0.25
V
DD
= 3V OR 5V
V
DIFF
=
±10mV
0.20
OUTPUT VOLTAGE (V)
70
60
50
70
60
50
V
OL
(mV)
40
30
20
R
L
= 1kΩ
10
0
R
L
= 10kΩ
-50
-25
0
25
50
75
100
0.15
V
DD
- V
OH
0.10
V
OL
0.05
V
DD
- V
OH
(mV)
40
30
20
10
R
L
= 1kΩ
R
L
= 10kΩ
-50
-25
0
25
50
75
100
125
0
0
1
2
3
4
5
6
7
8
9
10
OUTPUT LOAD CURRENT (mA)
0
TEMPERATURE (°C)
125
TEMPERATURE (°C)
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
MAX4475 toc07
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
MAX4475 toc08
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
120
110
R
L
= 2kΩ
R
L
= 200kΩ
R
L
= 20kΩ
MAX4475 toc09
130
120
110
100
A
V
(dB)
R
L
= 2kΩ
R
L
= 20kΩ R
L
= 200kΩ
130
120
110
R
L
= 20kΩ R
L
= 200kΩ
100
A
V
(dB)
90
80
70
130
100
A
V
(dB)
R
L
= 2kΩ
90
80
70
V
DD
= 3V
R
L
REFERENCED TO V
DD
0
50
100
150
200
250
60
50
0
50
100
150
200
250
V
OUT
SWING FROM EITHER SUPPLY (mV)
V
OUT
SWING FROM EITHER SUPPLY (mV)
V
DD
= 5V
R
L
REFERENCED TO GND
90
80
70
60
50
0
50
100
150
200
250
V
OUT
SWING FROM EITHER SUPPLY (mV)
V
DD
= 3V
R
L
REFERENCED TO GND
60
50
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
MAX4475 toc10
LARGE-SIGNAL VOLTAGE GAIN
vs. TEMPERATURE
MAX4475 toc11
SUPPLY CURRENT vs. TEMPERATURE
PER AMPLIFIER
2.5
SUPPLY CURRENT (mA)
2.0
1.5
1.0
0.5
MAX4475 toc12
130
120
110
R
L
= 20kΩ
100
A
V
(dB)
90
80
70
60
50
0
50
100
150
200
V
DD
= 5V
R
L
REFERENCED TO V
DD
R
L
= 2kΩ
R
L
= 200kΩ
140
130
120
110
A
VOL
(dB)
100
90
80
70
60
50
V
OUT
= 150mV TO 4.75V
R
L
= 10kΩ
R
L
= 100kΩ
3.0
0
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
TEMPERATURE (°C)
250
V
OUT
SWING FROM EITHER SUPPLY (mV)
_______________________________________________________________________________________
5
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