MAX4175BLEUK-T [MAXIM]
Application Specific Amplifier ; 专用放大器\n
| 型号： | MAX4175BLEUK-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Application Specific Amplifier
|
| 文件： | 总20页 (文件大小：348K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1407; Rev 3; 8/99
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
75,MAX812/4
General Description
Features
♦ GainAmp Family Provides Internal Precision
Gain-Setting Resistors in SOT23 (MAX4174/5)
♦ 0.1% Gain Accuracy (R /R ) (MAX4174/5,
The MAX4174/MAX4175/MAX4274/MAX4275 Gain-
Amp™ family combines a low-cost Rail-to-Rail® op amp
with precision internal gain-setting resistors and V
/ 2
CC
F
G
biasing. Factory-trimmed on-chip resistors decrease
design size, cost, and layout, and provide 0.1% gain
accuracy. Fixed inverting gains from -0.25V/V to
-100V/V or noninverting gains from +1.25V/V to
+101V/V are available. These devices operate from a
single +2.5V to +5.5V supply and consume only 300µA.
GainAmp amplifiers are optimally compensated for
each gain version, achieving exceptional GBW prod-
MAX4274/5)
♦ 54 Standard Gains Available (MAX4174/5,
MAX4274/5)
♦ Open-Loop Unity-Gain-Stable Op Amps
(MAX4281/2/4)
♦ Rail-to-Rail Outputs Drive 1kΩ Load
♦ Internal V
/ 2 Biasing (MAX4175/MAX4275)
ucts up to 23MHz (A = +25V/V to +101V/V). High-volt-
V
CC
age fault protection withstands 17V at either input
without excessive current draw.
♦ +2.5V to +5.5V Single Supply
♦ 300µA Supply Current
Three versions are available in this amplifier family: single/
dual/quad open-loop, unity-gain stable (MAX4281/
MAX4282/MAX4284); single/dual fixed gain (MAX4174/
MAX4274); and single/dual fixed gain plus internal
♦ Up to 23MHz GBW Product
♦ Fault-Protected Inputs Withstand ±17V
♦ Stable with Capacitive Loads Up to 470pF with
V
/ 2 bias at the noninverting input (MAX4175/
CC
No Isolation Resistor
MAX4275), which simplifies input biasing in single-supply
designs. The input common-mode voltage range of the
open-loop amplifiers extends from 150mV below the
negative supply to within 1.2V of the positive supply.
The outputs can swing rail-to-rail and drive a 1kΩ load
while maintaining excellent DC accuracy. The amplifier
is stable for capacitive loads up to 470pF.
Ordering Information
PIN-
TOP
PART*
TEMP. RANGE
PACKAGE MARK
††
MAX4174_EUK-T -40°C to +85°C
MAX4175_EUK-T -40°C to +85°C
5 SOT23-5
††
5 SOT23-5
Applications
Ordering Information continued at end of data sheet.
* Insert the desired gain code (from the Gain Selection Guide)
in the blank to complete the part number.
Refer to the Gain Selection Guide for a list of preferred gains
and SOT Top Marks.
Portable Instruments
Instruments, Terminals,
and Bar-Code Readers
Keyless Entry
Photodiode Preamps
Smart-Card Readers
Infrared Receivers for
Remote Controls
Low-Side Current-Sense
Amplifiers
††
Selector Guide appears at end of data sheet.
Pin Configurations
Typical Operating Circuit
TOP VIEW
+5V
V
MAX4174
5
CC
0.1µF
V
CC
1
OUT
V
CC
MAX4175
R
B
R
F
+
IN+
IN-
V
2
3
EE
0.1µF
R
G
R
B
OUT
V
EE
IN+
4
IN-
INPUT
R
G
R
F
SOT23-5
0.1µF
V
EE
Pin Configurations continued at end of data sheet.
†
Patent pending
GainAmp is a trademark of Maxim Integrated Products. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
Voltage Inputs (IN_)
MAX4281/4282/4284.....................(V - 0.3V) to (V
MAX4174/4175/4274/4275 (with respect to GND) ........... 17V
Output Short-Circuit Duration
(OUT_).....................................Continuous to Either V or V
Continuous Power Dissipation (T = +70°C)
to V ) ....................................-0.3V to +6V
8-Pin µMAX (derate 4.1mW/°C above +70°C)............330mW
14-Pin SO (derate 8.3mW/°C above +70°C)...............667mW
16-Pin QSOP (derate 8.3mW/°C above +70°C)..........667mW
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
CC
EE
+ 0.3V)
CC
EE
EE
CC
A
5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
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.
ELECTRICAL CHARACTERISTICS—MAX4174/MAX4175/MAX4274/MAX4275 Fixed-Gain
Amplifiers
(V
= +2.5V to +5.5V, V = 0, V
= V = V
/ 2, R to V
/ 2, R = open, T = T
to T , unless otherwise noted. Typical
MAX
CC
EE
IN+
IN-
CC
L
CC
L
A
MIN
values are at V
= +5V and T = +25°C.) (Note 1)
CC
A
PARAMETER
SYMBOL
CONDITIONS
Guaranteed by PSRR tests
MIN
2.5
TYP
MAX
5.5
UNITS
Supply Voltage Range
V
CC
V
V
= 3V
= 5V
= 3V
= 5V
300
330
320
355
0.5
460
510
480
530
2.5
CC
CC
CC
CC
MAX4174/MAX4274
V
V
V
Supply Current
(per Amplifier)
I
µA
CC
MAX4175/MAX4275,
includes V / 2 bias resistors
CC
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
V
R = 100kΩ
L
mV
µV/°C
nA
OS
5
I
IN_+, MAX4174/MAX4274 (Note 2)
0.05
150
40
10
BIAS
A < 25V/V
V
Inverting Input Resistance
kΩ
A > 25V/V
V
MAX4174/MAX4274
MAX4175/MAX4275
1000
75
MΩ
kΩ
Noninverting Input
Resistance
V
/ 2
V
/ 2
CC
CC
IN_+ Bias Voltage
MAX4175/MAX4275, V + = V
-
V
IN
IN
- 0.25
+ 0.25
- 1.2
CC
75,MAX812/4
IN_+ Input Voltage Range
IN_- Input Voltage Range
Guaranteed by functional test (Note 3)
Guaranteed by functional test
V
V
V
V
V
EE
V
EE
CC
Power-Supply Rejection
Ratio
PSRR
V
CC
= 2.5V to 5.5V
70
90
dB
Ω
Closed-Loop Output
Impedance
R
OUT
0.02
Shorted to V
Shorted to V
10
65
2
EE
Short-Circuit Current
mA
CC
V
CC
V
OL
V
CC
V
OL
- V
8
8
OH
R = 100kΩ
L
- V
- V
2
Output Voltage Swing
(Note 4)
EE
V /V
OH OL
mV
150
60
250
150
OH
EE
R = 1kΩ
L
- V
2
_______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
75,MAX812/4
ELECTRICAL CHARACTERISTICS—MAX4174/MAX4175/MAX4274/MAX4275 Fixed-Gain
Amplifiers (continued)
(V
CC
= +2.5V to +5.5V, V = 0, V
= V = V
/ 2, R to V
/ 2, R = open, T = T
to T , unless otherwise noted. Typical
MAX
EE
IN+
IN-
CC
L
CC
L
A
MIN
PARAMETER
SYMBOL
CONDITIONS
Output settling to 1%
MIN
TYP
1
MAX
UNITS
ms
Power-Up Time
Slew Rate
SR
V
CC
= 5V, V
= 4V step
0.7
V/µs
OUT
Settling Time to Within
0.01%
V
CC
= 5V, V
= 4V step
7
µs
OUT
Input Noise Voltage Density
Input Noise Current Density
Capacitive Load Stability
e
n
f = 10kHz (Note 5)
f = 10kHz
90
4
nV/√Hz
fA/√Hz
pF
i
n
C
No sustained oscillations
470
LOAD
(V + 25mV) < V
R = 100kΩ (Note 6)
L
< (V
- 25mV),
EE
OUT
CC
DC Gain Accuracy
0.1
0.5
%
Gain = +1.25V/V
Gain = +3V/V
Gain = +5V/V
Gain = +10V/V
Gain = +25V/V
Gain = +51V/V
1700
970
970
640
590
330
-3dB Bandwidth
BW
kHz
-3dB
ELECTRICAL CHARACTERISTICS—MAX4281/MAX4282/MAX4284 Open-Loop Op Amps
(V
= +2.5V to +5.5V, V = 0, V
= V = V
/ 2, R to V
/ 2, R = open, T = T
to T , unless otherwise noted. Typical
MAX
CC
EE
IN+
IN-
CC
L
CC
L
A
MIN
values are at V
= +5V and T = +25°C.) (Note 1)
CC
A
PARAMETER
SYMBOL
CONDITIONS
Guaranteed by PSRR tests
MIN
TYP
MAX
5.5
450
500
2
UNITS
V
Supply Voltage Range
V
CC
2.5
V
CC
V
CC
= 3V
= 5V
290
320
0.5
5
µA
Supply Current
(per Amplifier)
I
CC
µA
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
Input Resistance
V
OS
R = 100kΩ
L
mV
µV/°C
nA
I
0.05
10
10
BIAS
I
1000
pA
OS
R
C
Differential or common mode
Guaranteed by CMRR test
1000
2.5
MΩ
pF
IN
Input Capacitance
IN
Common-Mode Input
Voltage Range
CMVR
CMRR
PSRR
V
- 0.15
V
- 1.2
V
EE
CC
Common-Mode Rejection
Ratio
V
V
- 0.15V ≤ V
≤ V - 1.2V
CC
60
70
90
90
dB
dB
Ω
EE
CM
Power-Supply Rejection
Ratio
= 2.5V to 5.5V
CC
Closed-Loop Output
Impedance
R
OUT
A = 1V/V
V
0.02
_______________________________________________________________________________________
3
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
ELECTRICAL CHARACTERISTICS—MAX4281/MAX4282/MAX4284 Open-Loop Op Amps
(continued)
(V
= +2.5V to +5.5V, V = 0, V
= V = V
/ 2, R to V
/ 2, R = open, T = T
to T , unless otherwise noted. Typical
MAX
CC
EE
IN+
IN-
CC
L
CC
L
A
MIN
values are at V
= +5V and T = +25°C.) (Note 1)
CC
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
10
65
120
100
2
MAX
UNITS
mA
mA
dB
dB
Shorted to V
Shorted to V
EE
Short-Circuit Current
CC
V
EE
V
EE
+ 0.05V < V
+ 0.25V < V
< V - 0.1V, R = 100kΩ
90
80
OUT
CC
L
Large-Signal Voltage Gain
Output Voltage Swing
A
VOL
< V - 0.3V, R = 1kΩ
OUT
CC
L
OH
EE
V
- V
8
CC
OL
CC
OL
R = 100kΩ
L
V
V
V
- V
- V
2
8
V /V
OH OL
mV
160
60
2
250
100
OH
EE
R = 1kΩ
L
- V
Gain Bandwidth Product
Slew Rate
GBW
SR
MHz
V/µs
µs
V
V
= 5V, V
= 5V, V
= 4V step
= 4V step
0.7
7
CC
OUT
Settling Time to within 0.01%
Input Noise Voltage Density
Input Noise Current Density
Capacitive Load Stability
Power-Up Time
CC
OUT
e
n
f = 10kHz
f = 10kHz
60
1.8
470
1
nV/√Hz
fA/√Hz
pF
i
n
C
LOAD
No sustained oscillations, A = 1V/V
V
Output settling to 1%
ms
Note 1: MAX4174/MAX4175/MAX4281 and MAX4274/MAX4275/MAX4282 and MAX4284 are 100% production tested at
= +25°C. All temperature limits are guaranteed by design.
T
A
Note 2: Guaranteed by design.
Note 3: The input common-mode range for IN_+ is guaranteed by a functional test. A similar test is done on the IN_- input. See the
Applications Information section for more information on the input voltage range of the GainAmp.
Note 4: For A = -0.5V/V and A = -0.25V/V, the output voltage swing is limited by the input voltage range.
V
V
Note 5: Includes noise from on-chip resistors.
Note 6: The gain accuracy test is performed with the GainAmp in noninverting configuration. The output voltage swing is limited by
the input voltage range for certain gains and supply voltage conditions. For situations where the output voltage swing is lim-
ited by the valid input range, the output limits are adjusted accordingly.
Typical Operating Characteristics
(V = +5V, R = 100kΩ to V / 2, small-signal V
= 100mVp-p, large-signal V
= 1Vp-p, T = +25°C, unless otherwise noted.)
A
OUT
CC
L
CC
OUT
75,MAX812/4
LARGE-SIGNAL GAIN
vs. FREQUENCY
LARGE-SIGNAL GAIN
vs. FREQUENCY
LARGE-SIGNAL GAIN
vs. FREQUENCY
4
3
4
4
3
3
2
2
2
A
V
= +5V/V
A
V
= +2.5V/V
A
V
= +1.25V/V
1
1
0
1
0
0
-1
-2
-3
-4
-5
-6
-1
-2
-3
-4
-5
-6
-1
-2
-3
-4
-5
-6
A
= +4V/V
V
A
= +9V/V
V
A
= +2.25V/V
100k
V
1k
10k
1M
10M
1k
10k
100k
1M
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
4
_______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
75,MAX812/4
Typical Operating Characteristics (continued)
(V = +5V, R = 100kΩ to V / 2, small-signal V
= 100mVp-p, large-signal V
= 1Vp-p, T = +25°C, unless otherwise noted.)
A
OUT
CC
L
CC
OUT
MAX4174/MAX4175
LARGE-SIGNAL GAIN
vs. FREQUENCY
LARGE-SIGNAL GAIN
vs. FREQUENCY
LARGE-SIGNAL GAIN
vs. FREQUENCY
4
4
3
2
1
0
4
3
3
2
2
A = +25V/V
V
A
V
= +51V/V
A
V
= +10V/V
1
0
1
0
-1
-2
-3
-4
-5
-6
-1
-2
-3
-4
-5
-6
-1
-2
-3
-4
-5
-6
A
V
= +50V/V
A
= +21V/V
V
A
V
= +100V/V
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
SMALL-SIGNAL GAIN
vs. FREQUENCY
SMALL-SIGNAL GAIN
vs. FREQUENCY
SMALL-SIGNAL GAIN
vs. FREQUENCY
4
3
4
3
4
3
2
2
2
A
V
= +5V/V
A
V
= +1.25V/V
A
V
= +2.5V/V
1
1
1
0
0
0
-1
-2
-3
-4
-5
-6
-1
-2
-3
-4
-5
-6
-1
-2
-3
-4
-5
-6
A
= +9V/V
V
A
= +4V/V
V
A
= +2.25V/V
100k
V
1k
10k
1M
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
FREQUENCY (Hz)
SMALL-SIGNAL GAIN
vs. FREQUENCY
SMALL-SIGNAL GAIN
vs. FREQUENCY
SMALL-SIGNAL GAIN
vs. FREQUENCY
4
3
4
3
4
3
2
2
2
A
V
= +51V/V
A
V
= +10V/V
A
V
= +25V/V
1
1
1
0
0
0
-1
-2
-3
-4
-5
-6
-1
-2
-3
-4
-5
-6
-1
-2
-3
-4
-5
-6
A
V
= +100V/V
100k
A
V
= +21V/V
100k
A
V
= +50V/V
100k
1k
10k
1M
10M
1k
10k
1M
10M
1k
10k
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
_______________________________________________________________________________________
5
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
Typical Operating Characteristics (continued)
(V = +5V, R = 100kΩ to V / 2, small-signal V
= 100mVp-p, large-signal V
= 1Vp-p, T = +25°C, unless otherwise noted.)
A
CC
L
CC
OUT
OUT
MAX4174/MAX4175
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
0
0
V = 1Vp-p
OUT
V
= 1Vp-p
OUT
-20
-20
-40
-40
-60
-60
A
V
= +51V/V
A
V
= +10V/V
A
V
= +1.25V/V
-80
-80
-100
-120
A
V
= +25V/V
100k
-100
-120
A
V
= +3V/V
1k
10k
1M
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
vs. OUTPUT VOLTAGE SWING
TOTAL HARMONIC DISTORTION
vs. OUTPUT VOLTAGE SWING
-60
-60
f = 10kHz
f = 10kHz
-70
-80
-70
-80
A
V
= +51V/V
A
= +10V/V
V
-90
-90
A
V
= +25V/V
A
V
= +1.25V/V
-100
-110
-120
-100
-110
-120
A
= +3V/V
V
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VOLTAGE SWING (Vp-p)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VOLTAGE SWING (Vp-p)
75,MAX812/4
VOLTAGE NOISE DENSITY vs. FREQUENCY
CURRENT NOISE DENSITY vs.
FREQUENCY
VOLTAGE NOISE DENSITY vs. FREQUENCY
(A = +25, +51)
V
(A = +1.25, +3, +10)
V
1000
100
10
1000
A
V
= +10V/V
A
V
= +3V/V
A
V
= +25V/V
100
A
V
= +51V/V
10k
A
V
= +1.25V/V
10k
INCLUDES RESISTOR NOISE
10
1
10
1
10
100
1k
100k
1
10
100
1k
10k
100k
1
10
100
1k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
6
_______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
75,MAX812/4
Typical Operating Characteristics (continued)
(V = +5V, R = 100kΩ to V / 2, small-signal V
= 100mVp-p, large-signal V
= 1Vp-p, T = +25°C, unless otherwise noted.)
A
OUT
CC
L
CC
OUT
MAX4174/MAX4175
LARGE-SIGNAL PULSE RESPONSE
SMALL-SIGNAL PULSE RESPONSE
INPUT
VOLTAGE
INPUT
VOLTAGE
A
= +1.25V/V
OUTPUT
50mV/div
V
A = +1.25V/V
V
OUTPUT
500mV/div
A
= +3V/V
OUTPUT
V
A = +3V/V
V
OUTPUT
50mV/div
50mV/div
A
= +5V/V
OUTPUT
V
A = +5V/V
V
50mV/div
OUTPUT
500mV/div
A
V
= +10V/V
OUTPUT
50mV/div
A = +10V/V
V
OUTPUT
500mV/div
A
V
= +25V/V
OUTPUT
50mV/div
A = +25V/V
V
OUTPUT
500mV/div
A
V
= +51V/V
OUTPUT
50mV/div
A = +51V/V
V
OUTPUT
500mV/div
2µs/div
C = 0
L
2µs/div
C = 0
L
_______________________________________________________________________________________
7
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
Typical Operating Characteristics (continued)
(V = +5V, R = 100kΩ to V / 2, small-signal V
= 100mVp-p, large-signal V
= 1Vp-p, T = +25°C, unless otherwise noted.)
A
OUT
CC
L
CC
OUT
MAX4174/MAX4175/MAX4281/MAX4282/MAX4284
POWER-SUPPLY REJECTION
vs. FREQUENCY
OUTPUT VOLTAGE SWING
OUTPUT IMPEDANCE
vs. FREQUENCY
vs. R
LOAD
-70
-75
-80
-85
-90
-95
5.0
100
10
1
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4.0
0.1
0.01
100
1k
10k
100k
1M
1
10
100
100
1k
10k
100k
1M
FREQUENCY (Hz)
R
LOAD
(kΩ)
FREQUENCY (Hz)
INPUT BIAS CURRENT
vs. TEMPERATURE
INPUT OFFSET VOLTAGE vs.
TEMPERATURE
200
150
100
50
1000
800
600
400
200
0
V
CC
= 5.5V
V
= 2.5V
= 5.5V
CC
0
V
-50
-100
-150
-200
CC
V
CC
= 2.5V
-200
-50 -35 -20 -5 10 25 40 55 70 85
TEMPERATURE (°C)
-45 -30 -15
0
15 30 45 60 75 90
75,MAX812/4
TEMPERATURE (°C)
V
AND V vs. TEMPERATURE
OL
V
AND V vs. TEMPERATURE
OH
OH
OL
(V = 2.5V)
CC
SUPPLY CURRENT vs. TEMPERATURE
(V = 5.5V)
CC
100
80
380
200
180
160
140
120
100
80
V
= 5.5V
CC
V
, R = 1kΩ
L
OH
360
340
320
300
280
260
240
V
, R = 1kΩ
L
OH
V
CC
= 5V
60
V , R = 100kΩ
OH L
V
CC
= 4V
40
V , R = 10kΩ
OH L
20
V , R = 100kΩ
OH L
60
V
, R = 10kΩ
L
0
OH
V
, R = 100kΩ
L
40
OL
-20
-40
-60
-80
-100
20
0
V
, R = 100kΩ
L
OL
V , R = 10kΩ
OL L
-20
-40
-60
-80
-100
V
= 3V
CC
V
OL
, R = 1kΩ
L
V
, R = 100kΩ
L
OL
V
CC
= 2.5V
V
, R = 1kΩ
OL L
-50 -35 -20 -5 10 25 40 55 70 85
TEMPERATURE (°C)
-50 -35 -20 -5 10 25 40 55 70 85
TEMPERATURE (°C)
-50 -35 -20 -5 10 25 40 55 70 85
TEMPERATURE (°C)
8
_______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
75,MAX812/4
Typical Operating Characteristics
(V = +5V, R = 100kΩ to V / 2, small-signal V
= 100mVp-p, large-signal V
= 1Vp-p, T = +25°C, unless otherwise noted.)
A
OUT
CC
L
CC
OUT
MAX4281/MAX4282/MAX4284
OPEN-LOOP GAIN AND PHASE
vs. FREQUENCY
SMALL-SIGNAL GAIN
vs. FREQUENCY
LARGE-SIGNAL GAIN
vs. FREQUENCY
4
4
3
160
140
120
100
80
3
2
2
1
1
60
40
20
0
-20
-40
0
0
-1
-2
-3
-4
-5
-1
-2
-3
-4
-5
-6
0
-45
-90
-135
-180
-225
-270
-315
-6
1
10
100 1k
10k 100k 1M 10M
1k
10k
100k
1M
10M
100k
10M
1k
10k
100k
1M
10M
100k
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
CURRENT NOISE DENSITY
vs. FREQUENCY
COMMON-MODE REJECTION
vs. FREQUENCY
VOLTAGE NOISE DENSITY
vs. FREQUENCY
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
1000
100
10
10
1
100
1k
10k
100k
1M
10M
1
10
100
1k
10k
1
10
100
1k
10k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
MAX4282
CROSSTALK vs. FREQUENCY
MAX4284
CROSSTALK vs. FREQUENCY
-50
-55
-60
-65
-70
-75
-80
-85
-90
-95
-50
-55
-60
0
THREE AMPLIFIERS DRIVEN,
ONE OUTPUT MEASURED
A
V
= 1
OUT
V
-10
-20
-30
-40
-50
-60
-70
-80
-90
= 1Vp-p
-65
-70
-75
-100
-110
-120
1k
10k
100k
1M
1k
10k
100k
1M
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
_______________________________________________________________________________________
9
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
Pin Description
PIN
NAME
FUNCTION
FUNCTION
MAX4174/
MAX4175
MAX4274/
MAX4275
MAX4281
MAX4282
MAX4284
5 SOT23 8 SO
5 SOT23
8 SO/µMAX
8 SO/µMAX 14 SO/TSSOP 16 QSOP
NAME
OUT, OUTA,
OUTB,
1, 7,
8, 14
1, 7,
10, 16
1
2
6
4
1
1, 7
4
1, 7
4
Amplifier Output
OUTC,
OUTD
Negative Supply or
Ground
2
3
11
13
V
EE
Noninverting
Amplifier Input.
Internally biased to
IN+, INA+,
INB+, INC+,
IND+
3, 5,
10, 12
3, 5,
12, 14
3
4
3
3, 5
2, 6
3, 5
2, 6
V
CC
/ 2 for
MAX4175/MAX4275
Inverting Amplifier
Input. Connects to
IN-, INA-,
INB-, INC-,
IND-
2, 6,
9, 13
2, 6,
11, 15
2
7
4
R for MAX4174/
G
4175/4274/4275.
Positive Supply
5
5
8
8
4
4
V
CC
No Connection.
Not internally
connected.
1, 5,
8
—
—
8, 9
N.C.
—
—
—
Functional Diagrams
V
CC
V
CC
75,MAX812/4
V
CC
V
CC
150k
150k
R
B
MAX4175
MAX4174
IN+
MAX4281
IN+
IN-
IN+
OUT
OUT
OUT
R
B
R
G
R
F
V
G
EE
IN-
R
R
F
IN-
V
EE
V
EE
V
EE
10 ______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
75,MAX812/4
ly increases usable bandwidth, while decompensation
above gains of +25V/V offers diminished returns.
Detailed Description
Maxim’s GainAmp fixed-gain amplifiers combine a low-
cost rail-to-rail op amp with internal gain-setting resis-
tors. Factory-trimmed on-chip resistors provide 0.1%
gain accuracy while decreasing design size, cost, and
layout. Three versions are available in this amplifier
family: single/dual/quad open-loop, unity-gain-stable
devices (MAX4281/MAX4282/MAX4284); single/dual
fixed-gain devices (MAX4174/MAX4274); and single/
V
/ 2 Internal Bias
CC
The MAX4175/MAX4275 GainAmp fixed-gain amplifiers
with the V / 2 bias option are identical to standard
CC
GainAmp fixed-gain amplifiers, with the added feature
of V / 2 internal bias at the noninverting inputs. Two
CC
150kΩ resistors form a voltage-divider for self-biasing
the noninverting input, eliminating external bias resis-
tors for AC-coupled applications, and allowing maxi-
mum signal swing at the op amp’s rail-to-rail output for
single-supply systems (see Typical Operating Circuit).
For DC-coupled applications, use the MAX4174/
MAX4274.
dual devices with fixed gain plus internal V
/ 2 bias
CC
at the noninverting input (MAX4175/MAX4275). All
amplifiers feature rail-to-rail outputs and drive a 1kΩ
load while maintaining excellent DC accuracy.
Open-Loop Op Amps
The single/dual/quad MAX4281/MAX4282/MAX4284
are high-performance, open-loop op amps with rail-to-
rail outputs. These devices are compensated for unity-
gain stability, and feature a gain bandwidth (GBW) of
2MHz. The op amps in these ICs feature an input com-
mon-mode range that extends from 150mV below the
negative rail to within 1.2V of the positive rail. These
high performance op amps serve as the core for this
family of GainAmp fixed-gain amplifiers. Although the
-3dB bandwidth will not correspond to that of a fixed-
gain amplifier in higher gain configurations, these
open-loop op-amps can be used to prototype designs.
High-Voltage ( 17V) Input Fault Protection
The MAX4174/MAX4175/MAX4274/MAX4275 include
17V input fault protection. For normal operation, see
the input voltage range specification in the Electrical
Characteristics. Overdriven inputs up to 17V will not
V
CC
-R
R
F
A =
V
G
R
R
F
R
R
A = 1 +
V
F
G
G
IN-
Internal Gain-Setting Resistors
Maxim’s proprietary laser trimming techniques produce
V
EE
the necessary R /R values (Figure 1), so many gain
F
G
offerings are easily available. These GainAmp fixed-gain
amplifiers feature a negative-feedback resistor network
that is laser trimmed to provide a gain-setting feedback
OUT
IN+
ratio (R /R ) with 0.1% typical accuracy. The standard
F
G
Figure 1. Internal Gain-Setting Resistors
op amp pinouts allow the GainAmp fixed-gain amplifiers
to drop in directly to existing board designs, easily
replacing op-amp-plus-resistor gain blocks.
60
MAX4281, A = 100
V
2MHz GBW
GainAmp Bandwidth
GainAmp fixed-gain amplifiers feature factory-trimmed
precision resistors to provide fixed inverting gains from
-0.25V/V to -100V/V or noninverting gains from
+1.25V/V to +101V/V. The op-amp core is decompen-
sated strategically over the gain-set options to maxi-
mize bandwidth. Open-loop decompensation increases
GBW product, ensuring that usable bandwidth is main-
tained with increasing closed-loop gains. A GainAmp
50
MAX4174,
A = 100
V
40
23MHz GBW
-3dB
20kHz
230kHz
30
20
10
0
with a fixed gain of A = 100V/V has a -3dB bandwidth
V
of 230kHz. By comparison, a unity-gain-stable op amp
configured for A = 100V/V would yield a -3dB band-
V
10 100
1k 10k 100k 1M 10M
FREQUENCY (Hz)
width of only 20kHz (Figure 2). Decompensation is per-
formed at five intermediate gain sets, as shown in the
Gain Selection Guide. Low gain decompensation great-
Figure 2. Gain-Bandwidth Comparison
______________________________________________________________________________________ 11
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
cause output phase reversal. A back-to-back SCR
GainAmp Input Voltage Range
The MAX4174/MAX4175/MAX4274/MAX4275 combine
both an op amp and gain-setting feedback resistors on
the same chip. Because the inverting input pin is actu-
structure at the input pins allows either input to safely
swing 17V relative to V (Figure 3). Additionally, the
EE
internal op-amp inputs are diode clamped to either
supply rail for the protection of sensitive input stage cir-
cuitry. Current through the clamp diodes is limited by a
ally tied to the R input series resistor, the inverting
G
input voltage range is different from the noninverting
input voltage range. Just as with a discrete design,
care must be taken not to saturate the inputs/output of
the core op amp, to avoid signal distortions or clipping.
5kΩ resistor at the noninverting input, and by R at the
G
inverting input. An IN+ or IN- fault voltage as high as
17V will cause less than 3.5mA of current to flow
through the input pin, protecting both the GainAmp and
the signal source from damage.
The inverting inputs (IN_-) of the MAX4174/MAX4175/
MAX4274/MAX4275 must be within the supply rails or
signal distortion may result. The GainAmp’s inverting
input structure includes diodes to both supplies, such
that driving the inverting input beyond the rails may
cause signal distortions (Figure 1). For applications that
require sensing voltages beyond the rails, use the
MAX4281/MAX4282/MAX4284 open-loop op amps
(Figure 4).
Applications Information
GainAmp fixed-gain amplifiers offer a precision, fixed
gain amplifier in a small package that can be used in a
variety of circuit board designs. GainAmp fixed-gain
amplifiers can be used in many op amp circuits that use
resistive negative feedback to set gain, and that do not
require other connections to the op-amp inverting input.
Both inverting and noninverting op-amp configurations
can be implemented easily using a GainAmp.
R
F
R
G
IN-
17V
SCR
75,MAX812/4
OUT
MAX4174
MAX4175
MAX4274
MAX4275
V
CC
V
CC
V
EE
5k
IN+
17V
SCR
NOTE: INPUT STAGE PROTECTION INCLUDES
V
EE
V
EE
V
EE
TWO 17V SCRs AND TWO DIODES AT THE INPUT STAGE.
BIAS RESISTORS (MAX4175/MAX4275 ONLY)
Figure 3. Input Protection
12 ______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
75,MAX812/4
MAX4281
V
CC
MAX4175
V
CC
R
R
B
B
V
2
R
F
R
G
CC
V
OUT
=
- V
IN
(
)
V
CC
0.1µF
V
IN
R
G
R
F
-R
F
V
OUT
=
(V )
IN
V
IN
R
G
R
G
R
F
Figure 4. Single-Supply, DC-Coupled Inverting Amplifier with
Negative Input Voltage
Figure 6. Single-Supply, AC-Coupled Inverting Amplifier
MAX4174
MAX4174
V
CC
V
CC
V
IN
R
R
F
V
OUT
= V 1+
IN
(
)
R
R
F
G
V
OUT
= - V
IN
(
)
G
V
EE
V
EE
R
F
V
IN
R
G
R
F
R
G
Figure 5. Dual-Supply, DC-Coupled Inverting Amplifier
Figure 7. Dual-Supply, AC-Coupled Noninverting Amplifier
GainAmp Signal Coupling
and Configurations
IN_+ Filter on MAX4175/MAX4275
Internal resistor biasing of the V / 2 bias options cou-
CC
Common op-amp configurations include both nonin-
verting and inverting amplifiers. Figures 5–8 show vari-
ous single and dual-supply circuit configurations.
Single-supply systems benefit from a midsupply bias
on the noninverting input (provided internally on
MAX4175/MAX4275), as this produces a quiescent DC
level at the center of the rail-to-rail output stage signal
swing. For dual-supply systems, ground-referenced
signals may be DC-coupled into the inverting or non-
inverting inputs.
ples power-supply noise directly to the op amp’s nonin-
verting input. To minimize high-frequency power-supply
noise coupling, add a 1µF to 0.1µF capacitor from IN+
to ground to create a lowpass filter (Figure 6). The low-
pass filter resulting from the internal bias resistors and
added capacitor can help eliminate higher frequency
power-supply noise coupling through the noninverting
input.
______________________________________________________________________________________ 13
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
gain amplifiers of this GainAmp family are stable with
Supply Bypassing and Board Layout
All devices in the GainAmp family operate from a +2.5V
to +5.5V single supply or from 1.25V to 2.75V dual
supplies. For single-supply operation, bypass the
power supply with a 0.1µF capacitor to ground. For
dual supplies, bypass each supply to ground. Bypass
with capacitors as close to the device as possible, to min-
imize lead inductance and noise. A printed circuit board
with a low-inductance ground plane is recommended.
capacitive loads up to 470pF. Stability with higher
capacitive loads can be improved by adding an isolation
resistor in series with the op-amp output, as shown in
Figure 9. This resistor improves the circuit’s phase mar-
gin by isolating the load capacitor from the amplifier’s
output. In Figure 10, a 1000pF capacitor is driven with a
100Ω isolation resistor exhibiting some overshoot but no
oscillation. Figures 11 and 12 show the typical small-sig-
nal pulse responses of GainAmp fixed-gain amplifiers
with 250pF and 470pF capacitive loads and no isolation
resistor.
Capacitive-Load Stability
Driving large capacitive loads can cause instability in
most low-power, rail-to-rail output amplifiers. The fixed-
MAX4174
INPUT
V
CC
V
IN
R
R
F
V
OUT
= V 1+
IN
(
)
G
A = +5V/V
V
OUTPUT
OUTPUT
50mV/div
V
EE
R
F
A = +5V/V
V
500mV/div
R
G
Figure 8. Dual-Supply, DC-Coupled Noninverting Amplifier
Figure 10. Small-Signal/Large-Signal Transient Response with
Excessive Capacitive Load with Isolation Resistor
75,MAX812/4
MAX4174
R
G
R
F
V
CC
R
ISO
OUTPUT
INPUT
C
L
R
L
V
EE
Figure 9. Dual-Supply, Capacitive-Load Driving Circuit
14 ______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
75,MAX812/4
INPUT
INPUT
A = +1.25V/V
V
A = +1.25V/V
V
OUTPUT
OUTPUT
50mV/div
50mV/div
A = +3V/V
V
A = +3V/V
V
OUTPUT
OUTPUT
50mV/div
50mV/div
A = +5V/V
V
A = +5V/V
V
OUTPUT
OUTPUT
50mV/div
50mV/div
A = +10V/V
V
A = +10V/V
V
OUTPUT
OUTPUT
50mV/div
50mV/div
A = +25V/V
V
OUTPUT
50mV/div
A = +25V/V
V
OUTPUT
50mV/div
A = +51V/V
V
A = +51V/V
V
OUTPUT
OUTPUT
50mV/div
50mV/div
2µs/div
2µs/div
Figure 11. MAX4174/MAX4175 Small-Signal Pulse Response
(C = 250pF, R = 100kΩ)
Figure 12. MAX4174/MAX4175 Small-Signal Pulse Response
(C = 470pF, R = 100kΩ)
L
L
L
L
______________________________________________________________________________________ 15
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
Gain Selection Guide
R /R
INVERTING
GAIN
1+ (R /R )
F G
NONINVERTING
GAIN
F
G
TOP MARK
GAIN
CODE
-3dB BW
(kHz)
†
MAX4174
MAX4175
AB*
AC
AD*
AE
0.25
0.5
1
1.25
1.5
2
1700
1280
590
450
1180
970
820
690
970
790
640
480
640
560
460
390
300
590
580
510
390
310
330
310
260
230
230
ACDS
ACDT
ACDU
ACDV
ACDW
ACDX
ACDY
ACDZ
ACEA
ACEB
ACEC
ACED
ACEE
ACEF
ACEG
ACEH
ACEI
ACET
ACEU
ACEV
ACEW
ACEX
ACEY
ACEZ
ACFA
ACFB
ACFC
ACFD
ACFE
ACFF
ACFG
ACFH
ACFI
1.25
1.5
2
2.25
2.5
3
AF
AG*
AH
AJ
2.5
3
3.5
4
AK*
AL
4
5
5
6
AM
AN
AO*
BA*
BB
6
7
8
9
9
10
11
13.5
16
21
25
26
31
41
50
51
61
81
100
101
10
12.5
15
20
24
25
30
40
49
50
60
80
99
100
BC
BD
BE*
BF
ACFJ
ACFK
ACFL
ACFM
ACFN
ACFO
ACFP
ACFQ
ACFR
ACFS
ACFT
ACEJ
ACEK
ACEL
ACEM
ACEN
ACEO
ACEP
ACEQ
ACER
ACES
BG
BH
BJ*
BK*
BL
BM
BN*
CA*
75,MAX812/4
Note: Gains in the noninverting configuration are 1+ (R /R ) and range from +1.25V/V to +101V/V. For a +1V/V gain, use the
F
G
MAX4281/MAX4282/MAX4284.
* Preferred Gains. These gain versions are available as samples and in small quantities.
†
The -3dB bandwidth is the same for inverting and noninverting configurations.
16 ______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
75,MAX812/4
Pin Configurations (continued)
TOP VIEW
MAX4175
+ -
MAX4281
1
2
3
5
4
1
2
3
OUT
5
4
V
CC
OUT
V
CC
R
R
F
V
V
EE
EE
+ -
R
G
R
IN+
IN+
IN-
V
CC
SOT23-5
SOT23-5
MAX4281
MAX4282
MAX4274
N.C.
OUTA
INA-
1
2
3
4
8
7
6
5
V
OUTA
1
8
7
6
V
CC
N.C.
IN-
1
2
3
4
8
CC
R
F
- +
- +
+ -
V
CC
OUTB
INB-
INA-
INA+
2
3
4
OUTB
INB-
7
6
R
G
R
F
+ -
INA+
IN+
OUT
N.C.
R
G
V
EE
INB+
V
EE
5
INB+
V
EE
5
µMAX/SO
MAX4284
µMAX/SO
SO
MAX4284
MAX4275
OUTA
INA-
1
14 OUTD
13 IND-
12 IND+
OUTA
INA-
1
16 OUTD
15 IND-
14 IND+
OUTA
INA-
1
2
3
4
8
7
6
V
CC
R
F
- + + -
+
+
+
+
-
-
-
-
- +
2
3
4
5
6
2
3
4
5
6
R
G
OUTB
V
CC
R
F
INA+
INA+
+ -
R
R
R
G
INA+
INB-
INB+
V
EE
V
EE
11
13
12
V
CC
V
CC
V
CC
R
R
INC+
INC-
INC+
INB+
INB-
10
9
INB+
INB-
V
EE
5
11 INC-
µMAX/SO
- +
+ -
8
OUTB
7
OUTC
OUTB
N.C.
7
8
10 OUTC
SO/TSSOP
9
N.C.
QSOP
______________________________________________________________________________________ 17
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
Chip Information
Ordering Information (continued)
PIN-
PACKAGE
TOP
MARK
TRANSISTOR COUNTS:
MAX4174: 178
MAX4175: 178
MAX4274: 332
MAX4275: 332
MAX4281: 178
MAX4282: 332
MAX4284: 328
PART*
TEMP. RANGE
MAX4274_EUA
MAX4274_ESA
MAX4275_EUA
MAX4275_ESA
MAX4281EUK-T
MAX4281ESA
MAX4282EUA
MAX4282ESA
MAX4284EUD
MAX4284ESD
MAX4284EEE
-40°C to +85°C 8 µMAX
-40°C to +85°C 8 SO
-40°C to +85°C 8 µMAX
—
—
—
—
ACDR
—
—
—
—
—
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
8 SO
5 SOT23-5
8 SO
-40°C to +85°C 8 µMAX
-40°C to +85°C 8 SO
-40°C to +85°C 14 TSSOP
SUBSTRATE CONNECTED TO V
EE
-40°C to +85°C
-40°C to +85°C
14 SO
16 QSOP
—
Note: Refer to Gain Selection Guide for SOT top marks.
*Insert the desired gain code (from the Gain Selection Guide) in
the blank to complete the part number. Refer to Gain Selection
Guide for a list of preferred gains.
Selector Guide
INVERTING GAINS
AVAILABLE (V/V)
NONINVERTING
GAIN
NO. OF
AMPS PER
PACKAGE
INTERNAL
RESISTORS
INTERNAL
PART*
PIN-PACKAGE
V
/2 BIAS
CC
(INVERTING, R /R )
(V/V)
F
-0.25 to -100
-0.25 to -100
-0.25 to -100
-0.25 to -100
G
MAX4174_
MAX4175_
MAX4274_
MAX4275_
+1.25 to +101
+1.25 to +101
+1.25 to +101
+1.25 to +101
Yes
Yes
Yes
Yes
No
Yes
No
1
1
2
2
5-pin SOT23
5-pin SOT23
75,MAX812/4
8-pin µMAX/SO
8-pin µMAX/SO
Yes
Open Loop,
Unity-Gain Stable
5-pin SOT23,
8-pin SO
MAX4281_
MAX4282_
MAX4284_
No
No
No
No
No
No
1
2
4
Open Loop,
Unity-Gain Stable
8-pin µMAX/SO
Open Loop,
Unity-Gain Stable
14-pin SO/TSSOP,
16-pin QSOP
* Insert the desired gain code (from the Gain Selection Guide) in the blank to complete the part number.
18 ______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
75,MAX812/4
Package Information
______________________________________________________________________________________ 19
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
Package Information
75,MAX812/4
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.
20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
相关型号：
MAX4175CAEUK+T
Operational Amplifier, 1 Func, 2000uV Offset-Max, BIPolar, PDSO5, SOT-23, 5 PIN
MAXIM
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