19-1407; Rev 3; 8/99
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
General Description
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
CC
/ 2
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-
ucts up to 23MHz (A
V
= +25V/V to +101V/V). High-volt-
age fault protection withstands ±17V at either input
without excessive current draw.
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
V
CC
/ 2 bias at the noninverting input (MAX4175/
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 1k
Ω
load
while maintaining excellent DC accuracy. The amplifier
is stable for capacitive loads up to 470pF.
Features
o
GainAmp Family Provides Internal Precision
Gain-Setting Resistors in SOT23 (MAX4174/5)
o
0.1% Gain Accuracy (R
F
/R
G
) (MAX4174/5,
MAX4274/5)
o
54 Standard Gains Available (MAX4174/5,
MAX4274/5)
o
Open-Loop Unity-Gain-Stable Op Amps
(MAX4281/2/4)
o
Rail-to-Rail Outputs Drive 1kΩ Load
o
Internal V
CC
/ 2 Biasing (MAX4175/MAX4275)
o
+2.5V to +5.5V Single Supply
o
300µA Supply Current
o
Up to 23MHz GBW Product
o
Fault-Protected Inputs Withstand ±17V
o
Stable with Capacitive Loads Up to 470pF with
No Isolation Resistor
MAX4174/5, MAX4274/5, MAX4281/2/4
†
Ordering Information
PART*
TEMP. RANGE
PIN-
PACKAGE
5 SOT23-5
5 SOT23-5
TOP
MARK
††
††
Applications
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
MAX4174_EUK-T
-40°C to +85°C
MAX4175_EUK-T
-40°C to +85°C
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.
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
Typical Operating Circuit
+5V
V
CC
0.1µF
MAX4174
OUT 1
R
F
+
V
EE
2
R
G
IN+ 3
4
IN-
0.1µF
R
B
INPUT
0.1µF
IN-
R
G
IN+
5 V
CC
R
B
V
CC
MAX4175
OUT
V
EE
R
F
V
EE
SOT23-5
Pin Configurations continued at end of data sheet.
†
Pg
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
MAX4174/5, MAX4274/5, MAX4281/2/4
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
to V
EE
) ....................................-0.3V to +6V
Voltage Inputs (IN_)
MAX4281/4282/4284.....................(V
EE
- 0.3V) to (V
CC
+ 0.3V)
MAX4174/4175/4274/4275 (with respect to GND) ...........±17V
Output Short-Circuit Duration
(OUT_).....................................Continuous to Either V
EE
or V
CC
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
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
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress rating s only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns 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
CC
= +2.5V to +5.5V, V
EE
= 0, V
IN+
= V
IN-
= V
CC
/ 2, R
L
to V
CC
/ 2, R
L
= open, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical
values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current
(per Amplifier)
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Inverting Input Resistance
Noninverting Input
Resistance
IN_+ Bias Voltage
IN_+ Input Voltage Range
IN_- Input Voltage Range
Power-Supply Rejection
Ratio
Closed-Loop Output
Impedance
Short-Circuit Current
PSRR
R
OUT
Shorted to V
EE
Shorted to V
CC
R
L
= 100kΩ
V
OH
/V
OL
R
L
= 1kΩ
V
CC
- V
OH
V
OL
- V
EE
V
CC
- V
OH
V
OL
- V
EE
I
BIAS
IN_+, MAX4174/MAX4274 (Note 2)
A
V
< 25V/V
A
V
> 25V/V
MAX4174/MAX4274
MAX4175/MAX4275
MAX4175/MAX4275, V
IN
+ = V
IN
-
Guaranteed by functional test (Note 3)
Guaranteed by functional test
V
CC
= 2.5V to 5.5V
V
CC
/ 2
- 0.25
V
EE
V
EE
70
90
0.02
10
65
2
2
150
60
8
8
250
150
mV
SYMBOL
V
CC
CONDITIONS
Guaranteed by PSRR tests
MAX4174/MAX4274
I
CC
MAX4175/MAX4275,
includes V
CC
/ 2 bias resistors
R
L
= 100kΩ
V
CC
= 3V
V
CC
= 5V
V
CC
= 3V
V
CC
= 5V
MIN
2.5
300
330
320
355
±0.5
±5
±0.05
150
40
1000
75
V
CC
/ 2
+ 0.25
V
CC
- 1.2
V
CC
±10
TYP
MAX
5.5
460
510
480
530
±2.5
mV
µV/°C
nA
kΩ
MΩ
kΩ
V
V
V
dB
Ω
mA
µA
UNITS
V
V
OS
Output Voltage Swing
(Note 4)
2
_______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
ELECTRICAL CHARACTERISTICS—MAX4174/MAX4175/MAX4274/MAX4275 Fixed-Gain
Amplifiers (continued)
(V
CC
= +2.5V to +5.5V, V
EE
= 0, V
IN+
= V
IN-
= V
CC
/ 2, R
L
to V
CC
/ 2, R
L
= open, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical
PARAMETER
Power-Up Time
Slew Rate
Settling Time to Within
0.01%
Input Noise Voltage Density
Input Noise Current Density
Capacitive Load Stability
DC Gain Accuracy
e
n
i
n
C
LOAD
SR
SYMBOL
CONDITIONS
Output settling to 1%
V
CC
= 5V, V
OUT
= 4V step
V
CC
= 5V, V
OUT
= 4V step
f = 10kHz (Note 5)
f = 10kHz
No sustained oscillations
(V
EE
+ 25mV) < V
OUT
< (V
CC
- 25mV),
R
L
= 100kΩ (Note 6)
Gain = +1.25V/V
Gain = +3V/V
-3dB Bandwidth
BW
-3dB
Gain = +5V/V
Gain = +10V/V
Gain = +25V/V
Gain = +51V/V
MIN
TYP
1
0.7
7
90
4
470
0.1
1700
970
970
640
590
330
kHz
0.5
MAX
UNITS
ms
V/µs
µs
nV/√Hz
fA/√Hz
pF
%
MAX4174/5, MAX4274/5, MAX4281/2/4
ELECTRICAL CHARACTERISTICS—MAX4281/MAX4282/MAX4284 Open-Loop Op Amps
(V
CC
= +2.5V to +5.5V, V
EE
= 0, V
IN+
= V
IN-
= V
CC
/ 2, R
L
to V
CC
/ 2, R
L
= open, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical
values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current
(per Amplifier)
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
Input Resistance
Input Capacitance
Common-Mode Input
Voltage Range
Common-Mode Rejection
Ratio
Power-Supply Rejection
Ratio
Closed-Loop Output
Impedance
I
BIAS
I
OS
R
IN
C
IN
CMVR
CMRR
PSRR
R
OUT
Guaranteed by CMRR test
V
EE
- 0.15V
≤
V
CM
≤
V
CC
- 1.2V
V
CC
= 2.5V to 5.5V
A
V
= 1V/V
V
EE
- 0.15
60
70
90
90
0.02
Differential or common mode
SYMBOL
V
CC
I
CC
V
OS
V
CC
= 3V
V
CC
= 5V
R
L
= 100kΩ
CONDITIONS
Guaranteed by PSRR tests
MIN
2.5
290
320
±0.5
±5
±0.05
±10
1000
2.5
V
CC
- 1.2
±10
±1000
TYP
MAX
5.5
450
500
±2
UNITS
V
µA
µA
mV
µV/°C
nA
pA
MΩ
pF
V
dB
dB
Ω
_______________________________________________________________________________________
3
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
MAX4174/5, MAX4274/5, MAX4281/2/4
ELECTRICAL CHARACTERISTICS—MAX4281/MAX4282/MAX4284 Open-Loop Op Amps
(continued)
(V
CC
= +2.5V to +5.5V, V
EE
= 0, V
IN+
= V
IN-
= V
CC
/ 2, R
L
to V
CC
/ 2, R
L
= open, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical
values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
Short-Circuit Current
Large-Signal Voltage Gain
A
VOL
SYMBOL
CONDITIONS
Shorted to V
EE
Shorted to V
CC
V
EE
+ 0.05V < V
OUT
< V
CC
- 0.1V, R
L
= 100kΩ
V
EE
+ 0.25V < V
OUT
< V
CC
- 0.3V, R
L
= 1kΩ
R
L
= 100kΩ
Output Voltage Swing
V
OH
/V
OL
R
L
= 1kΩ
Gain Bandwidth Product
Slew Rate
Settling Time to within 0.01%
Input Noise Voltage Density
Input Noise Current Density
Capacitive Load Stability
Power-Up Time
e
n
i
n
C
LOAD
GBW
SR
V
CC
= 5V, V
OUT
= 4V step
V
CC
= 5V, V
OUT
= 4V step
f = 10kHz
f = 10kHz
No sustained oscillations, A
V
= 1V/V
Output settling to 1%
V
CC
- V
OH
V
OL
- V
EE
V
CC
- V
OH
V
OL
- V
EE
MIN
TYP
10
65
120
100
2
2
160
60
2
0.7
7
60
1.8
470
1
8
8
250
100
MHz
V/µs
µs
nV/√Hz
fA/√Hz
pF
ms
mV
MAX
UNITS
mA
mA
dB
dB
90
80
Note 1:
MAX4174/MAX4175/MAX4281 and MAX4274/MAX4275/MAX4282 and MAX4284 are 100% production tested at
T
A
= +25°C. All temperature limits are guaranteed by design.
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
V
= -0.5V/V and A
V
= -0.25V/V, the output voltage swing is limited by the input voltage range.
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
CC
= +5V, R
L
= 100kΩ to V
CC
/ 2, small-signal V
OUT
= 100mVp-p, large-signal V
OUT
= 1Vp-p, T
A
= +25°C, unless otherwise noted.)
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX4174 TOC01
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX4174 TOC02
LARGE-SIGNAL GAIN
vs. FREQUENCY
3
2
NORMALIZED GAIN (dB)
1
0
-1
-2
-3
-4
-5
-6
A
V
= +9V/V
A
V
= +5V/V
MAX4174 TOC03
4
3
2
NORMALIZED GAIN (dB)
1
0
-1
-2
-3
-4
-5
-6
1k
10k
100k
FREQUENCY (Hz)
1M
A
V
= +2.25V/V
A
V
= +1.25V/V
4
3
2
NORMALIZED GAIN (dB)
1
0
-1
-2
-3
-4
-5
-6
A
V
= +4V/V
A
V
= +2.5V/V
4
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
4
_______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
MAX4174/5, MAX4274/5, MAX4281/2/4
Typical Operating Characteristics (continued)
(V
CC
= +5V, R
L
= 100kΩ to V
CC
/ 2, small-signal V
OUT
= 100mVp-p, large-signal V
OUT
= 1Vp-p, T
A
= +25°C, unless otherwise noted.)
MAX4174/MAX4175
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX4174 TOC04
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX4174 TOC05
LARGE-SIGNAL GAIN
vs. FREQUENCY
3
2
NORMALIZED GAIN (dB)
1
0
-1
-2
-3
-4
-5
-6
A
V
= +100V/V
A
V
= +51V/V
MAX4174 TOC06
4
3
2
NORMALIZED GAIN (dB)
1
0
-1
-2
-3
-4
-5
-6
1k
10k
100k
FREQUENCY (Hz)
1M
A
V
= +21V/V
A
V
= +10V/V
4
3
2
NORMALIZED GAIN (dB)
1
0
-1
-2
-3
-4
-5
-6
A
V
= +50V/V
A
V
= +25V/V
4
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX4174 TOC07
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX4174 TOC08
SMALL-SIGNAL GAIN
vs. FREQUENCY
3
2
NORMALIZED GAIN (dB)
1
0
-1
-2
-3
-4
-5
-6
A
V
= +9V/V
A
V
= +5V/V
MAX4174 TOC09
4
3
2
NORMALIZED GAIN (dB)
1
0
-1
-2
-3
-4
-5
-6
1k
10k
100k
FREQUENCY (Hz)
1M
A
V
= +2.25V/V
A
V
= +1.25V/V
4
3
2
NORMALIZED GAIN (dB)
1
0
-1
-2
-3
-4
-5
-6
A
V
= +4V/V
A
V
= +2.5V/V
4
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX4174 TOC10
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX4174 TOC11
SMALL-SIGNAL GAIN
vs. FREQUENCY
3
2
NORMALIZED GAIN (dB)
1
0
-1
-2
-3
-4
-5
-6
A
V
= +100V/V
A
V
= +51V/V
MAX4174 TOC12
4
3
2
NORMALIZED GAIN (dB)
1
0
-1
-2
-3
-4
-5
-6
1k
10k
100k
FREQUENCY (Hz)
1M
A
V
= +21V/V
A
V
= +10V/V
4
3
2
NORMALIZED GAIN (dB)
1
0
-1
-2
-3
-4
-5
-6
A
V
= +50V/V
A
V
= +25V/V
4
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
_______________________________________________________________________________________
5
51单片机
