MAX4475AUT+ [MAXIM]
Operational Amplifier, 1 Func, 750uV Offset-Max, BICMOS, PDSO6, ROHS COMPLIANT, MO-178AB, SOT-23, 6 PIN;
| 型号： | MAX4475AUT+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Operational Amplifier, 1 Func, 750uV Offset-Max, BICMOS, PDSO6, ROHS COMPLIANT, MO-178AB, SOT-23, 6 PIN 放大器 信息通信管理 光电二极管 |
| 文件： | 总17页 (文件大小：674K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2137; Rev 3; 9/05
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
General Description
Features
♦ Low Input Voltage-Noise Density: 4.5nV/√Hz
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.
♦ 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)
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.
♦ 42MHz GBW Product, Stable with A ≥ +5V/V
V
(MAX4488/MAX4489)
♦ Excellent DC Characteristics
V
= 70µV
OS
I
= 1pA
BIAS
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®,
Applications
ADC Buffers
DAC Output Amplifiers
and TSSOP Packages
Ordering Information
PIN-
TOP
Low-Noise Microphone/Preamplifiers
Digital Scales
Strain Gauges/Sensor Amplifiers
Medical Instrumentation
PART
TEMP RANGE
PACKAGE
MARK
-40°C to +125°C 6 SOT23-6
-40°C to +125°C 8 µMAX
-40°C to +125°C 8 SO
AAZV
—
MAX4475AUT-T
MAX4475AUA
MAX4475ASA
—
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX4475ATT+T -40°C to +125°C 6 TDFN-EP*
+ADD
+Denotes lead-free package.
*EP = Exposed paddle (connect to V ).
Typical Operating Characteristic
SS
Ordering Information continued at end of data sheet.
INPUT VOLTAGE-NOISE DENSITY
vs. FREQUENCY
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
25
Selector Guide
20
15
10
5
STABLE
GAIN BW
(MHz)
NO. OF
AMPS
PART
GAIN
(V/V)
SHDN
MAX4475
MAX4476
MAX4477
MAX4478
MAX4488
MAX4489
10
10
10
10
42
42
1
1
1
1
5
5
1
1
2
4
1
2
Yes
—
—
—
0
Yes
—
10
100
1k
10k
100k
FREQUENCY (Hz)
________________________________________________________________ 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
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (V
to V )......................-0.3V to +6.0V
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
DD
SS
Analog Input Voltage (IN_+, IN_-)....(V - 0.3V) to (V
+ 0.3V)
SS
DD
SHDN Input Voltage....................................(V - 0.3V) to +6.0V
SS
Output Short-Circuit Duration to Either Supply ..........Continuous
Continuous Power Dissipation (T = +70°C)
A
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
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 = 0V, V
= 0V, V
= V /2, R tied to V /2, SHDN = V , T = -40°C to +125°C, unless otherwise noted.
SS
CM
OUT
DD
L
DD
DD
A
Typical values are at T = +25°C.) (Notes 1, 2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
V
(Note 3)
2.7
5.5
V
DD
V
= 3V
= 5V
2.2
2.5
0.01
70
DD
DD
Normal mode
mA
µA
µV
Quiescent Supply Current Per
Amplifier
I
V
4.4
1.0
350
750
6
D
Shutdown mode (SHDN = V ) (Note 2)
SS
T
T
= +25°C
= -40°C to +125°C
A
A
Input Offset Voltage
V
OS
Input Offset Voltage Tempco
Input Bias Current
TC
0.3
1
µV/°C
pA
VOS
I
(Note 4)
(Note 4)
150
150
B
Input Offset Current
I
1
pA
OS
Differential Input Resistance
R
1000
GΩ
IN
T
T
= +25°C
= -40°C to +125°C
-0.2
-0.1
V
V
- 1.6
A
A
DD
Input Common-Mode Voltage
Range
Guaranteed by
CMRR Test
V
V
CM
- 1.7
DD
(V - 0.2V) ≤
SS
V
≤ (V
-
T
T
= +25°C
90
90
115
CM
DD
A
A
1.6V)
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
CMRR
PSRR
dB
dB
(V - 0.1V) ≤
SS
V
≤ (V
-
= -40°C to +125°C
CM
DD
1.7V)
V
= 2.7 to 5.5V
90
90
120
120
DD
R = 10kΩ to V /2;
V
L
DD
= 100mV to (V
- 125mV)
- 250mV)
OUT
DD
R = 1kΩ to V /2;
V
L
DD
85
85
110
110
Large-Signal Voltage Gain
A
dB
VOL
= 200mV to (V
OUT
DD
R = 500Ω to V /2;
V
L
DD
= 350mV to (V
- 500mV)
OUT
DD
2
_______________________________________________________________________________________
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
DC ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V, V = 0V, V
= 0V, V
= V /2, R tied to V /2, SHDN = V , T = -40°C to +125°C, unless otherwise noted.
SS
CM
OUT
DD
L
DD
DD
A
Typical values are at T = +25°C.) (Notes 1, 2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
- V
10
10
45
DD
OL
DD
OL
DD
OL
OH
|V
- V | ≥ 10mV,
IN-
IN+
R = 10kΩ to V /2
L
DD
V
V
V
V
V
- V
- V
40
SS
80
200
150
300
250
OH
SS
|V
IN+
- V | ≥ 10mV,
IN-
Output Voltage Swing
V
mV
OUT
R = 1kΩ to V /2
L
DD
- V
- V
50
100
80
OH
SS
|V
IN+
- V | ≥ 10mV,
IN-
R = 500Ω to V /2
L
DD
- V
Output Short-Circuit Current
Output Leakage Current
I
48
mA
µA
SC
Shutdown mode (SHDN = V ),
SS
I
0.001
1.0
LEAK
V
= V to V
SS DD
OUT
SHDN Logic Low
SHDN Logic High
SHDN Input Current
Input Capacitance
V
0.3 x V
V
V
IL
DD
V
0.7 x V
IH
DD
SHDN = V to V
0.01
10
1
µA
pF
SS
DD
C
IN
AC ELECTRICAL CHARACTERISTICS
(V
DD
= +5V, V = 0V, V
= 0V, V
= V /2, R tied to V /2, SHDN = V , T = +25°C.)
OUT DD L DD DD A
SS
CM
PARAMETER
SYMBOL
CONDITIONS
A = +1V/V
MIN
TYP
MAX
UNITS
MAX4475–MAX4478
MAX4488/MAX4489
MAX4475–MAX4478
MAX4488/MAX4489
MAX4475–MAX4478
MAX4488/MAX4489
10
42
V
Gain-Bandwidth Product
Slew Rate
GBWP
MHz
A = +5V/V
V
A = +1V/V
V
3
SR
V/µs
MHz
A = +5V/V
V
10
A = +1V/V
V
0.4
1.25
Full-Power Bandwidth (Note 5)
A = +5V/V
V
e
Peak-to-Peak Input Noise Voltage
f = 0.1Hz to 10Hz
260
nV
P-P
n
(P-P)
f = 10Hz
f = 1kHz
f = 30kHz
f = 1kHz
21
4.5
3.5
0.5
Input Voltage-Noise Density
Input Current-Noise Density
e
nV/√Hz
fA/√Hz
n
i
n
V
= 2V
,
OUT
P-P
f = 1kHz
f = 20kHz
f = 1kHz
f = 20kHz
0.0002
0.0007
0.0002
0.001
A = +1V/V
(MAX4475–MAX4478),
R = 10kΩ to GND
V
L
V
= 2V
,
OUT
P-P
A = +1V/V
(MAX4475–MAX4478),
R = 1kΩ to GND
V
Total Harmonic Distortion Plus
Noise (Note 6)
THD + N
%
L
V
= 2V
,
OUT
P-P
f = 1kHz
0.0004
0.0006
A = +5V/V
(MAX4488/MAX4489),
R = 10kΩ to GND
V
f = 20kHz
L
_______________________________________________________________________________________
3
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
AC ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V, V = 0V, V
= 0V, V
= V /2, R tied to V /2, SHDN = V , T = +25°C.)
SS
CM
OUT
DD
L
DD
DD
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
= 2V
,
OUT
P-P
f = 1kHz
0.0005
A = +5V/V
Total Harmonic Distortion Plus
Noise (Note 6)
V
THD + N
%
(MAX4488/MAX4489),
R = 1kΩ to GND
L
f = 20kHz
0.008
Capacitive-Load Stability
Gain Margin
No sustained oscillations
200
12
pF
dB
GM
MAX4475–MAX4478, A = +1V/V
70
V
Phase Margin
ΦM
degrees
MAX4488/MAX4489, A = +5V/V
80
V
Settling Time
To 0.01%, V
= 2V step
2
µs
µs
µs
µs
OUT
Delay Time to Shutdown
Enable Delay Time from Shutdown
Power-Up Delay Time
t
t
1.5
10
13
SH
V
V
= 2.5V, V
settles to 0.1%
EN
OUT
OUT
= 0 to 5V step, V
stable to 0.1%
OUT
DD
Note 1: All devices are 100% tested at T = +25°C. Limits over temperature are guaranteed by design.
A
Note 2: SHDN is available on the MAX4475/MAX4488 only.
Note 3: Guaranteed by the PSRR test.
Note 4: Guaranteed by design.
Note 5: 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 = 4V
.
OUT
P-P
Note 6: Lowpass-filter bandwidth is 22kHz for f = 1kHz and 80kHz for f = 20kHz. Noise floor of test equipment = 10nV/√Hz.
Typical Operating Characteristics
(V
= +5V, V = 0V, V
= 0V, V
= V /2, R tied to V /2, input noise floor of test equipment =10nV/√Hz for all distortion
DD
SS
CM
OUT DD L DD
measurements, T = +25°C, unless otherwise noted.)
A
INPUT OFFSET VOLTAGE
vs. INPUT COMMON-MODE VOLTAGE
INPUT OFFSET VOLTAGE DISTRIBUTION
OFFSET VOLTAGE vs. TEMPERATURE
18
250
50
40
30
20
V
COM
= 0V
16
14
12
10
8
200
150
100
50
0
-50
6
V
= 3V
-100
-150
-200
-250
DD
4
10
0
V
= 5V
DD
2
0
-50 -40 -30 -20 -10
0
10 20 30 40 50
(µV)
-50 -25
0
25
50
75 100 125
-0.5
0.5
1.5
2.5
3.5
4.5
V
TEMPERATURE (°C)
INPUT COMMON-MODE VOLTAGE (V)
OS
4
_______________________________________________________________________________________
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Typical Operating Characteristics (continued)
(V
DD
= +5V, V = 0V, V
= 0V, V
= V /2, R tied to V /2, input noise floor of test equipment =10nV/√Hz for all distortion
OUT DD L DD
SS
CM
measurements, T = +25°C, unless otherwise noted.)
A
OUTPUT VOLTAGE SWING (V
)
OL
OUTPUT VOLTAGE
vs. OUTPUT LOAD CURRENT
OUTPUT VOLTAGE SWING (V
vs. TEMPERATURE
)
OH
vs. TEMPERATURE
70
60
50
40
30
20
10
0
0.25
0.20
0.15
0.10
0.05
0
70
60
50
40
30
20
10
0
V
V
= 3V OR 5V
DD
=
10mV
DIFF
V
- V
OH
DD
R = 1kΩ
V
L
OL
R = 1kΩ
L
R = 10kΩ
L
R = 10kΩ
L
-50 -25
0
25
50
75 100 125
0
1
2
3
4
5
6
7
8
9
10
-50 -25
0
25
50
75 100 125
TEMPERATURE (°C)
OUTPUT LOAD CURRENT (mA)
TEMPERATURE (°C)
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
130
120
110
100
90
130
120
110
100
90
130
120
110
100
90
R = 200kΩ
R = 20kΩ
L
R = 2kΩ
L
R = 2kΩ R = 20kΩ R = 200kΩ
L
L
L
L
R = 20kΩ R = 200kΩ
L
L
R = 2kΩ
L
80
80
80
70
70
70
V
= 3V
V
= 3V
DD
V
= 5V
DD
DD
DD
60
60
60
R REFERENCED TO GND
R REFERENCED TO V
R REFERENCED TO GND
L
L
L
50
50
50
0
50
100
150
200
250
0
50
100
150
200
250
0
50
100
150
200
250
V
SWING FROM EITHER SUPPLY (mV)
V
OUT
SWING FROM EITHER SUPPLY (mV)
V
OUT
SWING FROM EITHER SUPPLY (mV)
OUT
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
LARGE-SIGNAL VOLTAGE GAIN
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
3.0
2.5
2.0
1.5
1.0
0.5
0
130
120
110
100
90
140
130
120
110
100
90
PER AMPLIFIER
R = 200kΩ
L
R = 100kΩ
L
R = 10kΩ
L
R = 20kΩ
L
R = 2kΩ
L
80
80
70
70
V
= 5V
DD
DD
60
60
R REFERENCED TO V
L
V
= 150mV TO 4.75V
OUT
50
50
-50 -25
0
25
50
75 100 125
0
50
100
150
200
250
-50 -25
0
25
50
75 100 125
TEMPERATURE (°C)
V
SWING FROM EITHER SUPPLY (mV)
TEMPERATURE (°C)
OUT
_______________________________________________________________________________________
5
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Typical Operating Characteristics (continued)
(V
DD
= +5V, V = 0V, V
= 0V, V
= V /2, R tied to V /2, input noise floor of test equipment =10nV/√Hz for all distortion
OUT DD L DD
SS
CM
measurements, T = +25°C, unless otherwise noted.)
A
INPUT OFFSET VOLTAGE
vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. OUTPUT VOLTAGE
3.0
2.5
2.0
1.5
1.0
0.5
0
3.0
2.5
2.0
1.5
1.0
0.5
0
20
15
10
5
PER AMPLIFIER
V
= 5V
DD
V
DD
= 3V
0
-5
-10
-15
-20
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0
1
2
3
4
5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
SUPPLY VOLTAGE (V)
MAX4475–MAX4478
GAIN AND PHASE vs. FREQUENCY
MAX4488/MAX4489
GAIN AND PHASE vs. FREQUENCY
MAX4475 toc16
MAX4475 toc17
60
50
180
60
180
144
108
72
V
= 3V OR 5V
DD
144
GAIN
50
40
30
20
10
0
R = 50kΩ
L
GAIN
C = 20pF
L
40
108
72
A
= +1000V/V
V
30
20
36
36
10
0
0
0
-36
-72
-108
-144
-180
-36
-72
-108
-144
-180
-10
-20
-30
-40
-10
-20
V
= 3V OR 5V
DD
L
L
V
R = 50kΩ
C = 20pF
A
PHASE
PHASE
-30
-40
= +1000V/V
100
1k
10k
100k
1M
10M 100M
100
1k
10k
100k
1M
10M 100M
INPUT FREQUENCY (Hz)
INPUT FREQUENCY (Hz)
MAX4475–MAX4478
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
OUTPUT IMPEDANCE vs. FREQUENCY
1000
100
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
V
= 3V OR 5V
DD
A
V
= +5
1
A
V
= +1
1k
-100
-110
-120
-130
0.1
0.01
1
10
100
FREQUENCY (Hz)
10k
0.001
0.1
10
FREQUENCY (kHz)
1000
100,000
6
_______________________________________________________________________________________
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Typical Operating Characteristics (continued)
(V
DD
= +5V, V = 0V, V
= 0V, V
= V /2, R tied to V /2, input noise floor of test equipment =10nV/√Hz for all distortion
OUT DD L DD
SS
CM
measurements, T = +25°C, unless otherwise noted.)
A
MAX4475
INPUT VOLTAGE-NOISE DENSITY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT VOLTAGE SWING
0.1Hz TO 10Hz NOISE
P-P
vs. FREQUENCY
MAX4475 toc21
25
10
A
= +1
V
V
= 3V OR 5V
V
DD
P-P
R = 100kΩ
L
NOISE = 260nV
P-P
20
1
15
0.1
0.01
200nV/div
10
5
f
= 20kHz, FILTER BW = 80kHz
O
0.001
f
= 3kHz, FILTER BW = 30kHz
O
0.0001
0
1s/div
10
100
1k
10k
100k
0
1
2
3
)
4
FREQUENCY (Hz)
OUTPUT VOLTAGE (V
P-P
MAX4488/MAX4489
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX4488/MAX4489
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT VOLTAGE SWING
MAX4475–MAX4478
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
0.01
0.01
10
A
= +5
FILTER BW = 80kHz
V
R = 100kΩ
L
V
= 2V
= +1
OUT P-P
A
V
1
0.1
R = 1kΩ
L
V
= +3V, f = 20kHz
O
0.001
0.01
0.001
DD
A
V
= +10, V = 3V
DD
V
FILTER BW = 80kHz
A
= +10, V = 5V
DD
FILTER BW = 22kHz
R TO V /2
L
DD
R TO GND
L
R = 10kΩ TO GND
L
V
= 3V, f = 3kHz
O
DD
0.0001
R1 = 5.6kΩ, R2 = 53kΩ
FILTER BW = 30kHz
V
OUT
= 2V
P-P
R TO V
L
DD
0.001
0.0001
0.00001
0
1
2
3
0
5k
10k
FREQUENCY (Hz)
15k
20k
0
5k
10k
FREQUENCY (Hz)
15k
20k
OUTPUT VOLTAGE (V
)
P-P
MAX4488/MAX4489
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4475–MAX4478
LARGE-SIGNAL PULSE RESPONSE
MAX4475–MAX4478
SMALL-SIGNAL PULSE RESPONSE
MAX4475 toc27
MAX4475 toc28
1
FILTER BW = 80kHz
R = 10kΩ TO GND
L
0.6V
R = 2.43kΩ, R = 10kΩ
1
2
2.5V
0.5V
V
OUT
= 2.75V
P-P
0.1
0.01
20mV/div
0.5V
A
= +5, V = 3V
DD
V
0.001
0.0001
A
V
= +5, V = 5V
DD
0
5k
10k
FREQUENCY (Hz)
15k
20k
1µs/div
4µs/div
V
V
= 3V, R = 10kΩ, C = 100pF
V
= 3V, R = 10kΩ, C = 100pF
DD
L
L
DD
IN
L
L
= 2V
V = 100mV PULSE
IN
_______________________________________________________________________________________
7
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Typical Operating Characteristics (continued)
(V
DD
= +5V, V = 0V, V
= 0V, V
= V /2, R tied to V /2, input noise floor of test equipment =10nV/√Hz for all distortion
OUT DD L DD
SS
CM
measurements, T = +25°C, unless otherwise noted.)
A
MAX4488/MAX4489
SMALL-SIGNAL PULSE RESPONSE
MAX4488/MAX4489
LARGE-SIGNAL PULSE RESPONSE
MAX4477/MAX4478/MAX4489
CROSSTALK vs. FREQUENCY
MAX4475 toc30
MAX4475 toc29
-20
-30
-40
-50
1.6V
V
OUT
50mV/div
V
OUT
1.5V
200mV/div
-60
-70
-80
-90
1µs/div
1µs/div
10 100 1000 10k 100k 1M 10M 100M
FREQUENCY (Hz)
V
V
= 3V, R = 10kΩ, C = 50pF
V
V
= 3V, R = 10kΩ, C = 50pF
DD
IN
L
L
DD
IN
L
L
= 20mV PULSE, A = +5V/V
= 20mV PULSE, A = +5V/V
V
V
Pin Description
PIN
MAX4475/
MAX4488
MAX4475/
MAX4488
MAX4477/
MAX4489
NAME
FUNCTION
MAX4476
MAX4478
SOT23/TDFN
SO/µMAX
SOT23/TDFN
SO/µMAX
SO/TSSOP
OUT, OUTA,
OUTB, OUTC,
OUTD
1
6
1
1, 7
1, 7, 8, 14
Amplifier Output
Negative Supply. Connect
to ground for single-
supply operation
V
2
3
4
3
2
3
4
11
SS
IN+, INA+,
INB+, INC+,
IND+
Noninverting Amplifier
Input
3, 5
3, 5, 10, 12
IN-, INA-, INB-,
INC-, IND-
4
6
2
7
4
6
2, 6
8
2, 6, 9, 13
4
Inverting Amplifier Input
V
Positive Supply
DD
Shutdown Input. Connect
to V
for normal
DD
5
8
—
—
—
SHDN
operation (amplifier(s)
enabled).
No Connection. Not
internally connected.
—
1, 5
—
5
—
—
—
—
N.C.
EP
Exposed Paddle. Connect
EP (TDFN
only)
EP (TDFN
only)
to V
.
SS
8
_______________________________________________________________________________________
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Detailed Description
The MAX4475–MAX4478/MAX4488/MAX4489 single-
supply operational amplifiers feature ultra-low noise
C
Z
and distortion. Their low distortion and low noise make
them ideal for use as preamplifiers in wide dynamic-
range applications, such as 16-bit analog-to-digital
converters (see Typical Operating Circuit). Their high-
input impedance and low noise are also useful for sig-
nal conditioning of high-impedance sources, such as
piezoelectric transducers.
R
F
R
G
V
OUT
These devices have true rail-to-rail ouput operation,
drive loads as low as 1kΩ while maintining DC accura-
cy, and can drive capactive loads up to 200pF without
oscillation. The input common-mode voltage range
V
IN
extends from (V
- 1.6V) to 200mV below the negative
DD
Figure 1. Adding Feed-Forward Compensation
rail. The push-pull output stage maintains excellent DC
characteristics, while delivering up to 5mA of current.
The MAX4475–MAX4478 are unity-gain stable, while
the MAX4488/MAX4489 have a higher slew rate and
are stable for gains ≥ 5V/V. The MAX4475/MAX4488
feature a low-power shutdown mode, which reduces
the supply current to 0.01µA and disables the outputs.
A = +2
V
R = R = 100kΩ
F
G
V
IN
100mV
0V
100mV/div
Low Distortion
Many factors can affect the noise and distortion that the
device contributes to the input signal. The following
guidelines offer valuable information on the impact of
design choices on Total Harmonic Distortion (THD).
V
OUT
100mV/div
Choosing proper feedback and gain resistor values for
a particular application can be a very important factor
in reducing THD. In general, the smaller the closed-
loop gain, the smaller the THD generated, especially
when driving heavy resistive loads. The THD of the part
normally increases at approximately 20dB per decade,
as a function of frequency. Operating the device near
or above the full-power bandwidth significantly
degrades distortion.
2µs/div
Figure 2a. Pulse Response with No Feed-Forward
Compensation
A = +2
V
R = R = 100kΩ
F
G
V
Referencing the load to either supply also improves the
part’s distortion performance, because only one of the
MOSFETs of the push-pull output stage drives the out-
put. Referencing the load to midsupply increases the
part’s distortion for a given load and feedback setting.
(See the Total Harmonic Distortion vs. Frequency graph
in the Typical Operating Characteristics.)
IN
100mV/div
V
OUT
100mV/div
For gains ≥ 5V/V, the decompensated devices
MAX4488/MAX4489 deliver the best distortion perfor-
mance, since they have a higher slew rate and provide
a higher amount of loop gain for a given closed-loop
gain setting. Capacitive loads below 100pF do not sig-
nificantly affect distortion results. Distortion perfor-
mance is relatively constant over supply voltages.
2µs/div
Figure 2b. Pulse Response with 10pF Feed-Forward
Compensation
_______________________________________________________________________________________
9
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Low Noise
The amplifier’s input-referred noise-voltage density is
A = +1
V
dominated by flicker noise at lower frequencies, and by
thermal noise at higher frequencies. Because the ther-
mal noise contribution is affected by the parallel combi-
V
= +5V
DD
R = 10kΩ
L
V
IN
2V/div
nation of the feedback resistive network (R || R ,
F
G
Figure 1), these resistors should be reduced in cases
where the system bandwidth is large and thermal noise
is dominant. This noise contribution factor decreases,
however, with increasing gain settings.
0V
V
OUT
2V/div
For example, the input noise-voltage density of the cir-
cuit with R = 100kΩ, R = 11kΩ (A = +5V/V) is
F
G
V
e
= 14nV/√Hz, e can be reduced to 6nV/√Hz by
n
n
choosing R = 10kΩ, R = 1.1kΩ (A = +5V/V), at the
F
G
V
40µs/div
expense of greater current consumption and potentially
higher distortion. For a gain of 100V/V with R = 100kΩ,
F
Figure 3. Overdriven Input Showing No Phase Reversal
R
= 1.1kΩ, the e is still a low 6nV/√Hz.
G
n
Using a Feed-Forward Compensation
Capacitor, C
Z
The amplifier’s input capacitance is 10pF. If the resis-
tance seen by the inverting input is large (feedback
network), this can introduce a pole within the amplifier’s
bandwidth resulting in reduced phase margin.
Compensate the reduced phase margin by introducing
5V
V
OUT
a feed-forward capacitor (C ) between the inverting
Z
1V/div
input and the output (Figure 1). This effectively cancels
the pole from the inverting input of the amplifier.
0V
Choose the value of C as follows:
Z
C = 10 x (R / R ) [pF]
Z
F
G
20µs/div
In the unity-gain stable MAX4475–MAX4478, the use of
a proper C is most important for A = +2V/V, and
V
Z
V
Figure 4. Rail-to-Rail Output Operation
A
= -1V/V. In the decompensated MAX4488/
MAX4489, C is most important for A = +10V/V.
Z
V
Figures 2a and 2b show transient response both with
and without C .
Ground-Sensing and Rail-to-Rail Outputs
Z
The common-mode input range of these devices
extends below ground, and offers excellent common-
mode rejection. These devices are guaranteed not to
undergo phase reversal when the input is overdriven
(Figure 3).
Using a slightly smaller C than suggested by the for-
Z
mula above achieves a higher bandwidth at the
expense of reduced phase and gain margin. As a gen-
eral guideline, consider using C for cases where R ||
Z
G
R
is greater than 20kΩ (MAX4475–MAX4478) or
greater than 5kΩ (MAX4488/MAX4489).
F
Figure 4 showcases the true rail-to-rail output operation
of the amplifier, configured with A = 5V/V. The output
V
swings to within 8mV of the supplies with a 10kΩ load,
making the devices ideal in low-supply voltage applica-
tions.
Applications Information
The MAX4475–MAX4478/MAX4488/MAX4489 combine
good driving capability with ground-sensing input and
rail-to-rail output operation. With their low distortion and
low noise, they are ideal for use in ADC buffers, med-
ical instrumentation systems and other noise-sensitive
applications.
Power Supplies and Layout
The MAX4475–MAX4478/MAX4488/MAX4489 operate
from a single +2.7V to +5.5V power supply or from dual
supplies of 1.35V to 2.75V. For single-supply opera-
tion, bypass the power supply with a 0.1µF ceramic
10 ______________________________________________________________________________________
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Typical Application Circuit
+5V
+2.5V
+5V
7
V
DD
U2
CS
REF
U1
3
2
SERIAL
INTERFACE
MAX4475AUA
SCLK
DIN
OUT
0 to +2.5V
OUTPUT
MAX5541ESA
6
AGND
DGND
8
4
SHDN
Typical Operating Circuit
5V
470pF
0.1µF
220pF
3.09kΩ
1%
7.87kΩ
1%
3
2
8
3.83kΩ
1%
13.7kΩ
1%
5
6
220pF
1
7.15kΩ
MAX4477
1/2
1%
220pF
7
1/2 MAX4477
4
220pF
10.0kΩ
1%
10.0kΩ
1%
15.0kΩ
1%
10.0kΩ
1%
capacitor placed close to the V
pin. If operating from
of error. In addition, the MAX4475 has excellent open-
loop gain and common-mode rejection, making this an
excellent ouput buffer amplifier.
DD
dual supplies, bypass each supply to ground.
Good layout improves performance by decreasing the
amount of stray capacitance and noise at the op amp’s
inputs and output. To decrease stray capacitance, min-
imize PC board trace lengths and resistor leads, and
place external components close to the op amp’s pins.
DC-Accurate Lowpass Filter
The MAX4475–MAX4478/MAX4488/MAX4489 offer a
unique combination of low noise, wide bandwidth, and
high gain, making them an excellent choice for active
filters up to 1MHz. The Typical Operating Circuit shows
the dual MAX4477 configured as a 5th order
Chebyschev filter with a cutoff frequency of 100kHz.
The circuit is implemented in the Sallen-Key topology,
making this a DC-accurate filter.
Typical Application Circuit
The Typical Application Circuit shows the single
MAX4475 configured as an output buffer for the
MAX5541 16-bit DAC. Because the MAX5541 has an
unbuffered voltage output, the input bias current of the
op amp used must be less than 6nA to maintain 16-bit
accuracy. The MAX4475 has an input bias current of
only 150pA (max), virtually eliminating this as a source
______________________________________________________________________________________ 11
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Pin Configurations
TOP VIEW
TOP VIEW
V
SHDN
N.C.
1
2
3
4
8
7
6
5
OUTA
INA-
1
2
3
4
8
7
6
5
DD
V
OUTB
INB-
INA-
INA+
DD
MAX4475
MAX4488
MAX4477
MAX4489
OUT
N.C.
INA+
V
SS
V
SS
INB+
SO/µMAX
SO/µMAX
TOP VIEW
OUT
TOP VIEW
TOP VIEW
6
5
4
OUTA
1
2
3
4
5
6
7
14 OUTD
1
2
3
6
5
4
V
DD
INA-
INA+
13 IND-
12 IND+
MAX4475
MAX4488
V
SS
SHDN
IN-
MAX4475
MAX4488
V
DD
11
V
SS
MAX4478
INB+
INB-
10 INC+
IN+
*EP
1
9
8
INC-
SOT23-6
+
OUTB
OUTC
2
3
SO/TSSOP
TDFN
*EP = EXPOSED PADDLE.
TOP VIEW
OUT
TOP VIEW
6
5
4
1
2
3
6
5
4
V
DD
MAX4476
N.C.
IN-
V
SS
MAX4476
IN+
*EP
SOT23-6
+
1
2
3
TDFN
*EP = EXPOSED PADDLE.
12 ______________________________________________________________________________________
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Ordering Information (continued)
Chip Information
MAX4475/MAX4476 TRANSISTOR COUNT: 1095
MAX4477 TRANSISTOR COUNT: 2132
MAX4478 TRANSISTOR COUNT: 4244
MAX4488 TRANSISTOR COUNT: 1095
MAX4489 TRANSISTOR COUNT: 2132
PROCESS: BiCMOS
PIN-
PACKAGE
TOP
MARK
PART
TEMP RANGE
-40°C to +125°C 6 SOT23-6
AAZX
+ADF
—
MAX4476AUT-T
MAX4476ATT+T -40°C to +125°C 6 TDFN-EP*
-40°C to +125°C 8 µMAX
-40°C to +125°C 8 µMAX
-40°C to +125°C 8 SO
MAX4477AUA
MAX4477AUA
MAX4477ASA
MAX4478AUD
MAX4478ASD
MAX4488AUT-T
MAX4488AUA
MAX4488ASA
—
—
-40°C to +125°C 14 TSSOP
-40°C to +125°C 14 SO
-40°C to +125°C 6 SOT23-6
-40°C to +125°C 8 µMAX
-40°C to +125°C 8 SO
—
—
AAZW
—
—
MAX4488ATT+T -40°C to +125°C 6 TDFN-EP*
+ADE
—
-40°C to +125°C 8 µMAX
-40°C to +125°C 8 SO
MAX4489AUA
MAX4489ASA
—
+Denotes lead-free package.
*EP = Exposed paddle (connect to V ).
SS
______________________________________________________________________________________ 13
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, SOT 6L BODY
1
21-0058
G
1
4X S
8
8
MILLIMETERS
INCHES
DIM MIN
MAX
MAX
MIN
-
-
0.043
0.006
0.037
0.014
0.007
0.120
1.10
0.15
0.95
0.36
0.18
3.05
A
0.002
0.030
0.010
0.005
0.116
0.05
0.75
0.25
0.13
2.95
A1
A2
b
E
H
Ø0.50 0.1
c
D
e
0.0256 BSC
0.65 BSC
0.6 0.1
E
H
0.116
0.188
0.016
0°
0.120
2.95
4.78
0.41
0°
3.05
5.03
0.66
6°
0.198
0.026
6°
L
1
1
α
S
0.6 0.1
0.0207 BSC
0.5250 BSC
D
BOTTOM VIEW
TOP VIEW
A1
A2
A
c
α
e
L
b
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0036
J
1
14 ______________________________________________________________________________________
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, TSSOP 4.40mm BODY
1
21-0066
G
1
e
4X S
10
10
INCHES
DIM MIN
MAX
MILLIMETERS
MIN
-
MAX
1.10
0.15
0.95
3.05
3.00
3.05
3.00
5.05
0.70
A
-
0.043
0.006
0.037
0.120
0.118
0.120
0.118
0.199
A1
A2
D1
D2
E1
E2
H
0.002
0.030
0.116
0.114
0.116
0.114
0.187
0.05
0.75
2.95
2.89
2.95
2.89
4.75
0.40
H
Ø0.50 0.1
0.6 0.1
L
0.0157 0.0275
0.037 REF
L1
b
0.940 REF
0.007
0.0106
0.177
0.090
0.270
1
1
e
0.0197 BSC
0.500 BSC
0.6 0.1
c
0.0035 0.0078
0.0196 REF
0.200
BOTTOM VIEW
0.498 REF
S
TOP VIEW
α
0°
6°
0°
6°
D2
E2
GAGE PLANE
A2
c
A
E1
b
L
α
A1
D1
L1
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 10L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0061
1
______________________________________________________________________________________ 15
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
INCHES
MILLIMETERS
DIM
A
MIN
MAX
0.069
0.010
0.019
0.010
MIN
1.35
0.10
0.35
0.19
MAX
1.75
0.25
0.49
0.25
0.053
0.004
0.014
0.007
N
A1
B
C
e
0.050 BSC
1.27 BSC
E
0.150
0.228
0.016
0.157
0.244
0.050
3.80
5.80
0.40
4.00
6.20
1.27
E
H
H
L
VARIATIONS:
INCHES
1
MILLIMETERS
DIM
D
MIN
MAX
0.197
0.344
0.394
MIN
4.80
8.55
9.80
MAX
5.00
N
8
MS012
AA
TOP VIEW
0.189
0.337
0.386
D
8.75 14
10.00 16
AB
D
AC
D
C
A
B
0∞-8∞
e
A1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0041
B
1
16 ______________________________________________________________________________________
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
D2
D
A2
PIN 1 ID
N
0.35x0.35
b
[(N/2)-1] x e
REF.
PIN 1
INDEX
AREA
E
E2
DETAIL A
e
A1
k
C
C
L
L
A
L
L
e
e
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
1
-DRAWING NOT TO SCALE-
21-0137
G
2
COMMON DIMENSIONS
SYMBOL
MIN.
0.70
2.90
2.90
0.00
0.20
MAX.
0.80
3.10
3.10
0.05
0.40
A
D
E
A1
L
k
0.25 MIN.
0.20 REF.
A2
PACKAGE VARIATIONS
DOWNBONDS
ALLOWED
PKG. CODE
T633-1
N
6
D2
E2
e
JEDEC SPEC
b
[(N/2)-1] x e
1.90 REF
1.90 REF
1.95 REF
1.95 REF
1.95 REF
2.00 REF
2.40 REF
2.40 REF
1.50 0.10 2.30 0.10 0.95 BSC
1.50 0.10 2.30 0.10 0.95 BSC
1.50 0.10 2.30 0.10 0.65 BSC
1.50 0.10 2.30 0.10 0.65 BSC
1.50 0.10 2.30 0.10 0.65 BSC
MO229 / WEEA
MO229 / WEEA
MO229 / WEEC
MO229 / WEEC
MO229 / WEEC
0.40 0.05
0.40 0.05
0.30 0.05
0.30 0.05
0.30 0.05
NO
NO
T633-2
6
T833-1
8
NO
T833-2
8
NO
T833-3
8
YES
NO
T1033-1
T1433-1
T1433-2
10
14
14
1.50 0.10 2.30 0.10 0.50 BSC MO229 / WEED-3 0.25 0.05
1.70 0.10 2.30 0.10 0.40 BSC
1.70 0.10 2.30 0.10 0.40 BSC
- - - -
- - - -
0.20 0.05
0.20 0.05
YES
NO
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
2
-DRAWING NOT TO SCALE-
21-0137
G
2
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
相关型号：
SI9130DB
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