19-1649; Rev 0; 4/00
Low-Cost, Low-Voltage, Rail-to-Rail,
Input/Output, SOT23 5MHz Op Amp
General Description
The MAX4321 operational amplifier (op amp) combines
a 5MHz gain-bandwidth product and excellent DC
accuracy with Rail-to-Rail
®
operation at both the inputs
and the output. This device requires only 650µA and
operates from either a single +2.4V to +6.5V supply or
dual ±1.2V to ±3.25V supplies, although the MAX4321
typically operates down to +1.8V (±0.9V). The
MAX4321 remains unity-gain stable with capacitive
loads up to 500pF and is capable of driving 250Ω loads
to within 200mV of either rail.
With rail-to-rail input common-mode range and output
swing, the MAX4321 is ideal for low-voltage, single-sup-
ply applications. In addition, low ±1.2mV input offset volt-
age and high 2V/µs slew rate make this device ideal for
signal-conditioning stages for precision, low-voltage data-
acquisition systems. The MAX4321 comes in a space-
saving 5-pin SOT23 package and is guaranteed over the
extended (-40°C to +85°C) temperature range.
The MAX4321 is a low-voltage, pin-for-pin compatible
upgrade for the LMC7101 that offers five-times higher
bandwidth, two-times faster slew rate, and about half the
input voltage noise density.
Features
♦
Low-Voltage, Pin-for-Pin Upgrade for LMC7101
♦
Guaranteed +2.4V to +6.5V Single-Supply
Operation
♦
Typically Operates Down to +1.8V
♦
5MHz Gain-Bandwidth Product
♦
650µA Quiescent Current
♦
Rail-to-Rail Common-Mode Input Voltage Range
♦
Rail-to-Rail Output Voltage Range
♦
Drives 250Ω Loads
♦
Unity-Gain Stable for Capacitive Loads up to
500pF
♦
No Phase Reversal for Overdriven Inputs
♦
Low-Cost Solution in SOT23-5 Package
MAX4321
________________________Applications
Battery-Powered Instruments
Portable Equipment
Data-Acquisition Systems
Sensor and Signal Conditioning
Low-Power, Low-Voltage Applications
General-Purpose Low-Voltage Applications
PART
MAX4321EUK-T
Ordering Information
TEMP.
RANGE
-40°C to +85°C
PIN-
PACKAGE
5 SOT23-5
TOP
MARK
ADOA
Typical Operating Circuit
+5V
Pin Configuration/
Functional Diagram
TOP VIEW
MAX187
3
6
SERIAL
INTERFACE
8
7
SHDN
DOUT
SCLK
CS
V
DD
AIN
VREF
GND
1
2
MAX4321
4
5
OUT
1
5
V
EE
V
CC
2
IN+
3
4
IN-
MAX4321
SOT23
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
Low-Cost, Low-Voltage, Rail-to-Rail,
Input/Output, SOT23 5MHz Op Amp
MAX4321
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
to V
EE
) ....................................-0.3V to +7V
All Other Pins ..................................(V
EE
- 0.3V) to (V
CC
+ 0.3V)
Output Short-Circuit Duration.....................................Continuous
(short to either supply)
Continuous Power Dissipation (T
A
= +70°C)
5-pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW
Operating Temperature Range ...........................-40°C to +85°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
CC
= +5.0V, V
EE
= 0, V
CM
= 0, V
OUT
= V
CC
/2, R
L
=
∞
connected to V
CC
/2, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Supply Voltage Range
Supply Current
Input Offset Voltage
Input Bias Current
Input Offset Current
Differential Input
Resistance
Common-Mode Input Voltage
Range
Common-Mode Rejection
Ratio
Power-Supply Rejection Ratio
Output Resistance
Large-Signal Voltage Gain
SYMBOL
V
CC -
V
EE
CONDITIONS
V
CC
= +2.4V
V
CC
= +6.5V
MIN
2.4
TYP
650
725
±1.2
±50
±4
500
MAX
6.5
UNITS
V
µA
V
CM
= V
OUT
= V
CC
/2
V
OS
I
BIAS
I
OFFSET
R
IN
V
CM
CMRR
PSRR
R
OUT
A
V
V
CM
= V
EE
or V
CC
V
CM
= V
EE
or V
CC
V
CM
= V
EE
or V
CC
-1.5V < V
DIFF
<+1.5V
±3.5
±150
±25
mV
nA
nA
kΩ
Inferred from CMRR test
V
EE
≤
V
CM
≤
V
CC
2.4V < V
CC
< 6.5V
A
V
= +1V/V
V
OUT
= 0.25V to 4.75V, R = 100kΩ
L
V
OUT
= 0.40V to 4.60V, R = 600Ω
L
V
OUT
= 0.40V to 4.60V, R = 250Ω
L
V
CC
- V
OH
R
L
= 100kΩ
V
OL
- V
EE
V
EE
60
66
91
100
0.1
103
100
70
86
25
20
135
60
200
100
50
V
CC
V
dB
dB
Ω
dB
Output Voltage Swing
V
OUT
R
L
= 600Ω
R
L
= 250Ω
V
CC
- V
OH
V
OL
- V
EE
V
CC
- V
OH
V
OL
- V
EE
mV
300
200
mA
Output Short-Circuit Current
2
_______________________________________________________________________________________
Low-Cost, Low-Voltage, Rail-to-Rail,
Input/Output, SOT23 5MHz Op Amp
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +5.0V, V
EE
= 0, V
CM
= 0, V
OUT
= V
CC
/2, R
L
=
∞
connected to V
CC
/2,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
MAX4321
PARAMETER
Supply Voltage Range
Supply Current
Input Offset Voltage
Input Offset Voltage
Temperature Coefficient
Input Bias Current
Input Offset Current
Common-Mode Input Voltage
Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Large-Signal Voltage Gain
Output Voltage Swing
SYMBOL
V
CC
- V
EE
I
CC
V
OS
CONDITIONS
V
CM
= V
OUT
= V
CC
/2
V
CM
= V
EE
or V
CC
MIN
2.4
TYP
MAX
6.5
1200
±6
UNITS
V
μA
mV
μV/°C
±2
I
BIAS
I
OFFSET
V
CM
CMRR
PSRR
A
V
V
OUT
V
CM
= V
EE
or V
CC
V
CM
= V
EE
or V
CC
Inferred from CMRR test
V
EE
≤
V
CM
≤
V
CC
2.4V < V
CC
< 6.5V
V
OUT
= 0.40V to 4.60V, R
L
= 250Ω
R = 250Ω
V
CC
- V
OH
V
OL
- V
EE
V
EE
54
62
66
350
250
±180
±50
V
CC
nA
nA
V
dB
dB
dB
mV
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +5.0V, V
EE
= 0, V
CM
= 0, V
OUT
= V
CC
/2, R
L
= 250Ω connected to V
CC
/2,
TA = +25°C,
unless otherwise noted.)
PARAMETER
Gain-Bandwidth Product
Phase Margin
Gain Margin
Total Harmonic Distortion
and Noise
Slew Rate
Settling Time to 0.01%
Turn-On Time
Input Capacitance
Input Noise Voltage Density
Input Noise Current Density
SYMBOL
GBP
CONDITIONS
MIN
TYP
5
64
12
MAX
UNITS
MHz
degrees
dB
%
V/μs
μs
μs
pF
nV/√
Hz
pA/√Hz
THD+N
SR
t
SETTLE
t
ON
C
IN
10kHz tone, V
OUT
= 2Vpp,
A
V
= +1V/V
V
OUT
= 1V step
V
OUT
= 2V step, A
V
= +1V/V
V
CC
= 0 to 3V step
f = 1kHz
f = 1kHz
0.003
2
2
1
3
22
0.4
Note 1:
All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design and characterization.
_______________________________________________________________________________________
3
Low-Cost, Low-Voltage, Rail-to-Rail,
Input/Output, SOT23 5MHz Op Amp
MAX4321
Typical Operating Characteristics
(V
CC
= +5V, V
EE
= 0, V
CM
= V
CC
/2, T
A
= +25°C, unless otherwise noted.)
GAIN AND PHASE vs. FREQUENCY
(WITH C
LOAD
)
180
144
40
GAIN
GAIN (dB)
20
108
PHASE (DEGREES)
72
36
0
0
PHASE
-36
-72
-20
A
V
= +1000
NO LOAD
1k
10k
100k
1M
10M
-108
-144
-180
100M
-40
100
-20
A
V
= +1000
R
L
=
∞
C
L
= 500pF
1k
10k
100k
1M
10M
40
GAIN
60
GAIN AND PHASE vs. FREQUENCY
60
MAX4321-01
POWER-SUPPLY REJECTION
vs. FREQUENCY
144
108
PHASE (DEGREES)
72
36
0
0
-20
PSR (dB)
-40
-60
-80
-100
10
100
1k
10k
100k
1M
10M 100M
A
V
= +1
MAX4321-03
MAX4321-02
180
GAIN (dB)
20
0
PHASE
-36
-72
-108
-144
-180
100M
-40
100
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
OUTPUT IMPEDANCE
vs. FREQUENCY
MAX4321-04
SUPPLY CURRENT vs. TEMPERATURE
MAX4321-05
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
2.25
1.50
VOLTAGE (mV)
0.75
0
-0.75
-1.50
-2.25
-3.00
-40 -25 -10
5
20
35
50
65
80
95
MAX4321-06
100
A
V
= +1
OUTPUT IMPEDANCE (Ω)
10
900
850
SUPPLY CURRENT (μA)
800
750
700
650
600
550
V
CC
= 2.7V
V
CC
= 6.5V
3.00
1
0.1
0.01
100
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
500
-40 -25 -10
5
20
35
50
65
80
95
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
MAX4321-07
INPUT BIAS CURRENT
vs. TEMPERATURE
MAX4321-08
COMMON-MODE REJECTION
vs. TEMPERATURE
115
110
105
100
95
90
85
80
V
CM
= -0.2V TO 5.2V
V
CM
= 0 TO 5.0V
MAX4321-09
50
40
INPUT BIAS CURRENT (nA)
30
20
10
0
-10
-20
-30
-40
-50
0
1
2
3
4
5
6
COMMON-MODE VOLTAGE (V)
V
CC
= 2.7V
V
CC
= 6.5V
50
40
INPUT BIAS CURRENT (nA)
30
20
10
0
-10
-20
-30
-40
-50
-60
-40 -25 -10
5
20
35
50
65
80
95
TEMPERATURE (°C)
V
CC
= 6.5V, V
CM
= V
EE
V
CC
= 2.7V, V
CM
= V
EE
V
CC
= 6.5V, V
CM
= V
CC
V
CC
= 2.7V, V
CM
= V
CC
120
COMMON-MODE REJECTION (dB)
-40 -25 -10
5
20
35
50
65
80
95
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Low-Cost, Low-Voltage, Rail-to-Rail,
Input/Output, SOT23 5MHz Op Amp
MAX4321
Typical Operating Characteristics (continued)
(V
CC
= +5V, V
EE
= 0, V
CM
= V
CC
/2, T
A
= +25°C, unless otherwise noted.)
MINIMUM OUTPUT VOLTAGE
vs. TEMPERATURE
MAX4321-10
MAXIMUM OUTPUT VOLTAGE
vs. TEMPERATURE
MAX4321-11
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
V
CC
= 2.7V
R
L
TO V
EE
R
L
= 100kΩ
MAX4321-12
250
R
L
TO V
CC
200
V
OUT
- V
EE
(mV)
V
CC
= 6.5V, R
L
= 500Ω
300
R
L
TO V
EE
250
V
CC
- V
OUT
(mV)
200
V
CC
= 6.5V, R
L
= 500Ω
120
110
100
GAIN (dB)
150
V
CC
= 2.7V, R
L
= 500Ω
100
R
L
= 10kΩ
R
L
= 2kΩ
R
L
= 500Ω
150
100
V
CC
= 2.7V, R
L
= 500Ω
90
80
50
V
CC
= 6.5V, R
L
= 100kΩ
V
CC
= 2.7V, R
L
= 100kΩ
-40 -25 -10
5
20
35
50
65
80
95
TEMPERATURE (°C)
50
0
V
CC
= 6.5V, R
L
= 100kΩ (TOP)
V
CC
= 2.7V, R
L
= 100kΩ (BOTTOM)
70
60
0
-40 -25 -10
5
20
35
50
65
80
95
0
100
200
300
400
500
600
TEMPERATURE (°C)
OUTPUT VOLTAGE: FROM V
CC
(mV)
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
MAX4321-13
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
MAX4321-14
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
V
CC
= 6.5V
R
L
TO V
CC
R
L
= 100kΩ
R
L
= 10kΩ
R
L
= 2kΩ
MAX4321-15
120
110
100
GAIN (dB)
90
80
V
CC
= 6.5V
R
L
TO V
EE
R
L
= 100kΩ
120
110
100
GAIN (dB)
90
80
R
L
= 2kΩ
R
L
= 500Ω
V
CC
= 2.7V
R
L
TO V
CC
R
L
= 100kΩ
R
L
= 10kΩ
120
110
100
GAIN (dB)
90
R
L
= 10kΩ
R
L
= 2kΩ
R
L
= 500Ω
80
70
60
R
L
= 500Ω
70
60
0
100
200
300
400
500
600
OUTPUT VOLTAGE: FROM V
CC
(mV)
70
60
0
100
200
300
400
500
600
OUTPUT VOLTAGE: FROM V
EE
(mV)
0
100
200
300
400
500
600
OUTPUT VOLTAGE: FROM V
EE
(mV)
LARGE-SIGNAL GAIN
vs. TEMPERATURE
MAX4321-16
LARGE-SIGNAL GAIN
vs. TEMPERATURE
V
CC
= 6.5V, R
L
TO V
EE
V
CC
= 6.5V, R
L
TO V
CC
120
115
MAX4321-17
MINIMUM OPERATING VOLTAGE
vs. TEMPERATURE
MINIMUM OPERATING VOLTAGE (V)
MAX4321-18
125
120
115
110
GAIN (dB)
105
100
95
90
85
80
75
R
L
= 500Ω
V
OUT
(p-p) = V
CC
- 1V
125
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
V
CC
= 6.5V,
R
L
TO V
EE
V
CC
= 2.7V,
R
L
TO V
EE
110
GAIN (dB)
105
100
95
90
85
V
CC
= 2.7V, R
L
TO V
EE
V
CC
= 2.7V, R
L
TO V
CC
V
CC
= 6.5V, R
L
TO V
CC
V
CC
= 2.7V, R
L
TO V
CC
-40 -25 -10
5
20
35
50
65
80
95
80
75
V
OUT
(p-p) = V
CC
- 600mV
R
L
= 100kΩ
-40 -25 -10
5
20
35
50
65
80
95
-40 -25 -10
5
20
35
50
65
80
95
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
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