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MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
General Description
The MAX4012 single, MAX4016 dual, MAX4018 triple, and
MAX4020 quad op amps are unity-gain-stable devices that
combine high-speed performance with Rail-to-Rail outputs.
The MAX4018 has a disable feature that reduces powersupply current to 400μA and places its outputs into a highimpedance state. These devices operate from a 3.3V to 10V
single supply or from ±1.65V to ±5V dual supplies. The common-mode input voltage range extends beyond the negative
power-supply rail (ground in single-supply applications).
These devices require only 5.5mA of quiescent supply
current while achieving a 200MHz -3dB bandwidth and a
600V/μs slew rate. These parts are an excellent solution
in low-power/low-voltage systems that require wide bandwidth, such as video, communications, and instrumentation. In addition, when disabled, their high-output impedance makes them ideal for multiplexing applications.
The MAX4012 comes in a miniature 5-pin SOT23 and 8-pin
SO package, while the MAX4016 comes in 8-pin μMAX®
and SO packages. The MAX4018/MAX4020 are available
in a space-saving 16-pin QSOP, as well as a 14-pin SO.
Applications
●
●
●
●
●
●
●
Set-Top Boxes
Surveillance Video Systems
Battery-Powered Instruments
Video Line Driver
Analog-to-Digital Converter Interface
CCD Imaging Systems
Video Routing and Switching Systems
Ordering Information
PART
TEMP
RANGE
PINPACKAGE
TOP
MARK
MAX4012EUK+T
-40°C to +85°C
5 SOT23-5
AMKD
MAX4012ESA+T
-40°C to +85°C
8 SO
—
MAX4016ESA+T
-40°C to +85°C
8 SO
—
MAX4016EUA+T
-40°C to +85°C
8 μMAX
—
Ordering Information continued at end of data sheet.
Typical Operating Circuit
Pin Configurations
RF
24Ω
MAX4012
Features
● Low-Cost
● High Speed:
• 200MHz -3dB Bandwidth (MAX4012)
• 150MHz -3dB Bandwidth
• (MAX4016/MAX4018/MAX4020)
• 30MHz 0.1dB Gain Flatness
• 600V/μs Slew Rate
● Single 3.3V/5.0V Operation
● Rail-to-Rail Outputs
● Input Common-Mode Range Extends Beyond VEE
● Low Differential Gain/Phase: 0.02%/0.02°
● Low Distortion at 5MHz:
• -78dBc SFDR
• -75dB Total Harmonic Distortion
● High-Output Drive: ±120mA
● 400μA Shutdown Capability (MAX4018)
● High-Output Impedance in Off State (MAX4018)
● Space-Saving SOT23, SO, μMAX, or QSOP Packages
TOP VIEW
MAX4012
RTO
50Ω
ZO = 50Ω
OUT 1
VOUT
VEE 2
RO
50Ω
IN
RTIN
50Ω
5
MAX4012
IN+ 3
4
SOT23-5
UNITY-GAIN LINE DRIVER
(RL = RO + RTO)
VCC
IN-
N.C. 1
8
N.C.
IN- 2
7
VCC
IN+ 3
6
OUT
VEE 4
5
N.C.
SO
Pin Configurations continued at end of data sheet.
μMAX is a registered trademark of Maxim Integrated Products, Inc.
19-1246; Rev 4; 8/22
© 2022 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
One Analog Way, Wilmington, MA 01887 U.S.A.
|
Tel: 781.329.4700
|
© 2022 Analog Devices, Inc. All rights reserved.
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
Absolute Maximum Ratings
Supply Voltage (VCC to VEE).................................................12V
IN_-, IN_+, OUT_, EN_.................. (VEE - 0.3V) to (VCC + 0.3V)
Output Short-Circuit Duration to VCC or VEE.............Continuous
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW
8-Pin SO (derate 5.9mW/°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
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
(VCC = 5V, VEE = 0, EN_ = 5V, RL = ∞ to VCC/2, VOUT = VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
VEE 0.20
MAX
UNITS
VCC 2.25
V
20
mV
Input Common-Mode
Voltage Range
VCM
Input Offset Voltage (Note 2)
VOS
4
TCVOS
8
μV/°C
Any channels for MAX4016/MAX4018/
MAX4020
±1
mV
Input Offset Voltage
Temperature Coefficient
Input Offset Voltage Matching
Guaranteed by CMRR test
IB
(Note 2)
5.4
20
μA
Input Offset Current
IOS
(Note 2)
0.1
20
μA
Input Resistance
RIN
Differential mode (-1V ≤ VIN ≤ +1V)
70
kΩ
Common mode (-0.2V ≤ VCM ≤ +2.75V)
3
MΩ
100
dB
Input Bias Current
Common-Mode Rejection Ratio
CMRR
(VEE - 0.2V) ≤ VCM ≤ (VCC - 2.25V)
Open-Loop Gain (Note 2)
AVOL
0.5V ≤ VOUT ≤ 4.5V, RL = 150Ω
70
0.25V ≤ VOUT ≤ 4.75V, RL = 2kΩ
61
52
1.0V ≤ VOUT ≤ 4V, RL = 50Ω
Output Current
Output Short-Circuit Current
Open-Loop Output Resistance
www.analog.com
57
VCC - VOH
0.06
VOL - VEE
0.06
VCC - VOH
0.30
VOL - VEE
0.30
VCC - VOH
0.6
1.5
VOL - VEE
0.6
1.5
RL = 75Ω
to ground
VCC - VOH
1.1
2.0
0.05
0.50
IOUT
RL = 20Ω to VCC or
VEE
TA = +25°C
±70
TA = TMIN to TMAX
±60
ISC
Sinking or sourcing
RL = 2kΩ
Output Voltage Swing
(Note 2)
dB
59
RL = 150Ω
VOUT
RL = 75Ω
ROUT
VOL - VEE
±120
V
mA
±150
mA
8
Ω
Analog Devices │ 2
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
DC Electrical Characteristics (continued)
(VCC = 5V, VEE = 0, EN_ = 5V, RL = ∞ to VCC/2, VOUT = VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
Power-Supply Rejection Ratio
(Note 3)
Operating Supply-Voltage
Range
Disabled Output Resistance
SYMBOL
PSRR
CONDITIONS
TYP
46
57
VCC = 5V, VEE = -5V, VCM = 0
54
VCC = 3.3V, VEE = 0, VCM = 0.90V
VS
ROUT (OFF)
EN_ Logic-Low Threshold
VIL
EN_ Logic-High Threshold
VIH
EN_ Logic Input Low Current
IIL
EN_ Logic Input High Current
IIH
Quiescent Supply Current
(per Amplifier)
IS
www.analog.com
MIN
VCC = 5V, VEE = 0, VCM = 2.0V
VCC to VEE
EN_ = 0, 0 ≤ VOUT ≤ 5V (Note 4)
MAX
UNITS
dB
66
45
3.15
28
11.0
35
V
kΩ
VCC 2.6
VCC 1.6
V
V
(VEE + 0.2V) ≤ EN_ ≤ VCC
0.5
EN_ = 0
200
400
EN_ = 5V
0.5
10
Enabled
5.5
7.0
MAX4018, disabled (EN_ = 0)
0.40
0.65
μA
μA
mA
Analog Devices │ 3
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
AC Electrical Characteristics
(VCC = 5V, VEE = 0, VCM = 2.5V, EN_ = 5V, RF = 24Ω, RL = 100Ω to VCC/2, VOUT = VCC/2, AVCL = 1, TA = +25°C, unless otherwise
noted.)
PARAMETER
SYMBOL
CONDITIONS
Small-Signal -3dB Bandwidth
BWSS
VOUT = 20mVP-P
Large-Signal -3dB Bandwidth
BWLS
VOUT = 2VP-P
Bandwidth for 0.1dB Gain
Flatness
BW0.1dB
MIN
TYP
MAX4012
200
MAX4016/MAX4018/
MAX4020
150
VOUT = 20mVP-P (Note 5)
6
MAX
UNITS
MHz
140
MHz
30
MHz
Slew Rate
SR
VOUT = 2V step
600
V/μs
Settling Time to 0.1%
tS
VOUT = 2V step
45
ns
1
ns
-78
dBc
Rise/Fall Time
tR, tF
VOUT = 100mVP-P
Spurious-Free Dynamic
Range
SFDR
fC = 5MHz, VOUT = 2VP-P
Harmonic Distortion
Two-Tone, Third-Order
Intermodulation Distortion
HD
IP3
Input 1dB Compression Point
2nd harmonic
-78
3rd harmonic
-82
Total harmonic
distortion
-75
dB
f1 = 10.0MHz, f2 = 10.1MHz, VOUT = 1VP-P
35
dBc
fC = 10MHz, AVCL = 2
11
dBm
fC = 5MHz,
VOUT = 2VP-P
dBc
Differential Phase Error
DP
NTSC, RL = 150Ω
0.02
degrees
Differential Gain Error
DG
NTSC, RL = 150Ω
0.02
%
Input Noise-Voltage Density
en
f = 10kHz
10
nV/√Hz
Input Noise-Current Density
in
f = 10kHz
1.3
nV/√Hz
1
pF
Input Capacitance
Disabled Output Capacitance
CIN
COUT (OFF)
MAX4018, EN_ = 0
2
pF
ZOUT
f = 10MHz
6
Ω
Amplifier Enable Time
tON
MAX4018
100
ns
Amplifier Disable Time
tOFF
MAX4018
1
μs
MAX4016/MAX4018/MAX4020,
f = 10MHz, VOUT = 20mVP-P
0.1
dB
MAX4016/MAX4018/MAX4020,
f = 10MHz, VOUT = 2VP-P, RS = 50Ω to ground
-95
dB
Output Impedance
Amplifier Gain Matching
Amplifier Crosstalk
XTALK
Note 1: The MAX4012EUT is 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by
design.
Note 2: Tested with VCM = 2.5V.
Note 3: PSR for single 5V supply tested with VEE = 0, VCC = 4.5V to 5.5V; for dual ±5V supply with VEE = -4.5V to -5.5V,
VCC = 4.5V to 5.5V; and for single 3.3V supply with VEE = 0, VCC = 3.15V to 3.45V.
Note 4: Does not include the external feedback network’s impedance.
Note 5: Guaranteed by design.
www.analog.com
Analog Devices │ 4
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
Typical Operating Characteristics
(VCC = 5V, VEE = 0, AVCL = 1, RF = 24Ω, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.)
1
9
8
7
-1
5
-1
-2
GAIN (dB)
6
0
GAIN (dB)
0
-2
-3
3
-4
2
-4
-5
1
-5
-6
0
-6
-7
-1
1M
10M
100M
1G
100k
1M
10M
100M
1G
10M
100M
MAX4016/MAX4018/MAX4020
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = 2)
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4012
GAIN FLATNESS vs. FREQUENCY
4
3
2
0.7
MAX4012-05
AVCL = 2
VOUT = 20mVP-P
VOUT = 2VP-P
VOUT BIAS = 1.75V
0.6
0.5
0.3
4
3
GAIN (dB)
0
GAIN (dB)
0.4
5
-1
-2
0.1
-3
0
1
-4
-0.1
0
-5
-0.2
-1
-6
10M
100M
1G
FREQUENCY (Hz)
MAX4016/MAX4018/MAX4020
GAIN FLATNESS vs. FREQUENCY
50
MAX4012-07
AVCL = 1
VOUT = 20mVP-P
1M
10M
100M
CROSSTALK (dB)
0.1
0
-0.1
-0.2
-50
-70
-90
-130
-150
0.1M
1M
10M
100M
FREQUENCY (Hz)
www.analog.com
1G
1G
1000
100
-30
-0.4
100M
CLOSED-LOOP OUTPUT IMPEDANCE
vs. FREQUENCY
-10
-0.5
10M
MAX4016/MAX4018/MAX4020
CROSSTALK vs. FREQUENCY
10
1
-110
-0.3
1M
FREQUENCY (Hz)
10
0.2
0.1M
FREQUENCY (Hz)
RS = 50Ω
30
-0.3
1G
IMPEDANCE (Ω)
0.5
100k
MAX4212-08
1M
AVCL = 1
VOUT = 20mVP-P
0.2
2
100k
1G
MAX4012-06
FREQUENCY (Hz)
1
0.3
1M
FREQUENCY (Hz)
6
0.4
100k
FREQUENCY (Hz)
MAX4012-09
7
100k
AVCL = 2
VOUT = 20mVP-P
4
-3
8
GAIN (dB)
AVCL = 1
VOUT = 20mVP-P
MAX4012
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = 2)
MAX4012-03
2
1
9
GAIN (dB)
3
MAX4012-04
GAIN (dB)
2
AVCL = 1
VOUT = 20mVP-P
MAX4016/MAX4018/MAX4020
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = 1)
MAX4012-02
3
MAX4012-01
4
MAX4012
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = 1)
100k
1M
10M
100M
FREQUENCY (Hz)
1G
0.1
0.1M
1M
10M
100M
FREQUENCY (Hz)
Analog Devices │ 5
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0, AVCL = 1, RF = 24Ω, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.)
3RD HARMONIC
-90
100k
1M
10M
0
2rd HARMONIC
-80
200
-30
800
MAX4012-16
-10
-20
-30
-40
-50
-60
-70
-80
-100
0.03
-60
2ND HARMONIC
-80
3RD HARMONIC
0.5
1.0
1.5
OUTPUT SWING (Vp-p)
-20
-30
-40
-50
-60
www.analog.com
1M
10M
FREQUENCY (Hz)
100M
RL to VCC/2
RL to GROUND
3.5
3.0
2.5
2.0
1.0
100k
100
OUTPUT SWING
vs. LOAD RESISTANCE
4.0
-80
100M
0
4.5
-100
10M
MAX4012-12
0.00
-0.01
IRE
0
-10
100
0.01
2.0
10
IRE
VCM = 1.35V
0.02
1.5
FREQUENCY (Hz)
0
0.03
-70
1M
100M
0.00
POWER-SUPPLY REJECTION
vs. FREQUENCY
20
10M
0.01
-0.01
-70
1M
VCM = 1.35V
0.02
-90
100k
100k
-50
1000
COMMON-MODE REJECTION
vs. FREQUENCY
-80
-40
-100
400
600
LOAD (Ω)
3RD
HARMONIC
-70
DIFFERENTIAL GAIN AND PHASE
-20
-90
3rd HARMONIC
-60
OUTPUT SWING (Vp-p)
-70
fO = 5MHz
-10
2ND HARMONIC
-50
FREQUENCY (Hz)
MAX4012-14
HARMONIC DISTORTION
vs. OUTPUT SWING
-40
-90
100M
HARMONIC DISTORTION
vs. LOAD
-60
0
100k
FREQUENCY (Hz)
-50
0
CMR (dB)
-100
100M
-40
-100
3RD HARMONIC
-90
-30
-90
-80
-30
MAX4012-17
-20
2ND HARMONIC
-70
FREQUENCY (Hz)
f = 5MHz
VOUT = 2VP-P
-10
HARMONIC DISTORTION (dBc)
10M
-60
HARMONIC DISTORTION (dBc)
0
1M
-50
MAX4012-13
-100
-40
-20
MAX4012-15
-80
-30
VOUT = 2VP-P
AVCL = 5
MAX4012-18
2ND HARMONIC
-70
HARMONIC DISTORTION (dBc)
-60
0
DIFF. GAIN (%)
-50
-20
HARMONIC DISTORTION
vs. FREQUENCY (AVCL = 5)
-10
DIFF. PHASE (deg)
-40
POWER-SUPPLY REJECTION (dB)
HARMONIC DISTORTION (dBc)
-30
VOUT = 2VP-P
AVCL = 2
-10
HARMONIC DISTORTION (dBc)
VOUT = 2VP-P
AVCL = 1
-20
0
MAX4012-10
0
-10
HARMONIC DISTORTION
vs. FREQUENCY (AVCL = 2)
MAX4012-11
HARMONIC DISTORTION
vs. FREQUENCY (AVCL = 1)
AVCL = 2
25
50
75
100
125
LOAD RESISTANCE (Ω)
150
Analog Devices │ 6
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0, AVCL = 1, RF = 24Ω, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.)
SMALL-SIGNAL PULSE RESPONSE
(AVCL = 2)
SMALL-SIGNAL PULSE RESPONSE
(AVCL = 1)
MAX4012-19
MAX4012-21
MAX4012-20
IN
(50mV/
div)
VOLTAGE
VOLTAGE
VOLTAGE
IN
(25mV/
div)
IN
(50mV/
div)
OUT
(25mV/
div)
OUT
(25mV/
div)
OUT
(25mV/
div)
20ns/div
20ns/div
20ns/div
VCM = 2.5V, RL = 100Ω to GROUND
VCM = 1.75V, RL = 100Ω to GROUND
VCM = 1.25V, RL = 100Ω to GROUND
LARGE-SIGNAL PULSE RESPONSE
(AVCL = 2)
LARGE-SIGNAL PULSE RESPONSE
(AVCL = 1)
MAX4012-22
LARGE-SIGNAL PULSE RESPONSE
(CL = 5pF, AVCL = 2)
MAX4012-24
MAX4012-23
IN
(1V/div)
IN
(1V/
div)
VOLTAGE
VOLTAGE
VOLTAGE
IN
(500mV/
div)
OUT
(1V/div)
OUT
(500mV/
div)
OUT
(500mV/
div)
20ns/div
VCM = 1.75V, RL = 100Ω to GROUND
VCM = 0.9V, RL = 100Ω to GROUND
10
ENABLE RESPONSE TIME
CURRENT-NOISE DENSITY
MAX4012-25
CURRENT-NOISE DENSITY
vs. FREQUENCY
10
MAX4012-27
MAX4012-26
VOLTAGE-NOISE DENSITY
vs. FREQUENCY
100
20ns/div
20ns/div
VCM = 1.75V, RL = 100Ω to GROUND
VOLTAGE-NOISE DENSITY
SMALL-SIGNAL PULSE RESPONSE
(CL = 5pF, AVCL = 1)
5.0V
(ENABLE)
EN_
0
(DISABLE)
OUT
1V
0
1
1
10
100
1k
10k 100k
FREQUENCY (Hz)
www.analog.com
1M
10M
1
1
10
100
1k
10k 100k
FREQUENCY (Hz)
1M
10M
1ms/div
VIN = 1.0V
Analog Devices │ 7
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0, AVCL = 1, RF = 24Ω, RL = 100Ω to VCC/2, TA = +25°C, unless otherwise noted.)
30
20
150
100
1k
INPUT BIAS CURRENT (mA)
5
4
100
200
300
400
500
LOAD RESISTANCE (Ω)
-25
0
25
50
TEMPERATURE (°C)
75
INPUT BIAS CURRENT
vs. TEMPERATURE
5.5
5.0
4.5
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
INPUT OFFSET VOLTAGE (mV)
8
6
4
2
-25
0
25
50
TEMPERATURE (°C)
75
3
4
www.analog.com
5
6
7
8
9
SUPPLY VOLTAGE (V)
10
11
10M
100M
0.16
0.12
0.08
0.04
100
4
3
2
1
-50
-25
0
25
50
TEMPERATURE (°C)
75
100
OUTPUT VOLTAGE SWING
vs. TEMPERATURE
5.0
RL = 150Ω TO VCC/2
4.8
4.6
4.4
4.2
4.0
0
0
1M
INPUT OFFSET CURRENT
vs. TEMPERATURE
0.20
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
5
MAX4012-34
10
100k
0
-50
100
-60
FREQUENCY (Hz)
OUTPUT VOLTAGE SWING (Vp-p)
-50
-50
600
4.0
3
-40
-80
6.0
MAX4012-31
6
-30
-90
0
SUPPLY CURRENT
vs. TEMPERATURE
-20
-70
50
INPUT OFFSET VOLTAGE
400
600
800
LOAD RESISTANCE (Ω)
MAX4012-30
MAX4012-29
200
MAX4012-32
200
7
SUPPLY CURRENT (mA)
250
0
0
SUPPLY CURRENT (mA)
300
MAX4012-33
40
0
-10
OFF-ISOLATION (dB)
50
350
OFF-ISOLATION vs. FREQUENCY
10
MAX4012-35
OPEN-LOOP GAIN (dB)
60
400
CLOSED-LOOP BANDWIDTH (MHz)
MAX4012-28
70
CLOSED-LOOP BANDWIDTH
vs. LOAD RESISTANCE
MAX4012-36
OPEN-LOOP GAIN
vs. LOAD RESISTANCE
-50
-25
0
25
50
TEMPERATURE (°C)
75
100
-50
-25
0
25
50
TEMPERATURE (°C)
75
100
Analog Devices │ 8
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
Pin Description
PIN
MAX4012
MAX4012
SO-8
MAX4018
MAX4020
NAME
FUNCTION
8, 9
N.C.
No Connection. Not internally connected. Tie
to ground or leave open.
—
—
OUT
Amplifier Output
11
13
VEE
Negative Power Supply or Ground (in singlesupply operation)
SOT23
MAX4016
SO/µMAX
SO
QSOP
SO
QSOP
1, 5, 8
—
—
—
8, 9
—
6
1
—
—
—
4
2
4
11
13
3
3
—
—
—
—
—
IN+
Noninverting Input
2
4
—
—
—
—
—
IN-
Inverting Input
7
5
8
4
4
4
4
—
—
1
7
7
1
1
VCC
OUTA
Positive Power Supply
Amplifier A Output
—
—
2
6
6
2
2
INA-
Amplifier A Inverting Input
—
—
3
5
5
3
3
INA+
Amplifier A Noninverting Input
Amplifier B Output
—
—
7
8
10
7
7
OUTB
—
—
6
9
11
6
6
INB-
Amplifier B Inverting Input
—
—
5
10
12
5
5
INB+
Amplifier B Noninverting Input
—
—
—
14
16
8
10
OUTC
Amplifier C Output
—
—
—
13
15
9
11
INC-
Amplifier C Inverting Input
—
—
—
12
14
10
12
INC+
Amplifier C Noninverting Input
—
—
—
—
—
14
16
OUTD
—
—
—
—
—
13
15
IND-
—
—
—
—
—
12
14
IND+
—
—
—
—
—
—
—
EN
Amplifier D Output
Amplifier D Inverting Input
Amplifier D Noninverting Input
Enable Amplifier
—
—
—
1
1
—
—
ENA
Enable Amplifier A
—
—
—
3
3
—
—
ENB
Enable Amplifier B
—
—
—
2
2
—
—
ENC
Enable Amplifier C
www.analog.com
Analog Devices │ 9
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
Detailed Description
The MAX4012/MAX4016/MAX4018/MAX4020 are single-supply, rail-to-rail, voltage-feedback amplifiers that
employ current-feedback techniques to achieve 600V/μs
slew rates and 200MHz bandwidths. Excellent harmonic
distortion and differential gain/phase performance make
these amplifiers an ideal choice for a wide variety of video
and RF signal-processing applications.
The output voltage swing comes to within 50mV of each
supply rail. Local feedback around the output stage
assures low open-loop output impedance to reduce gain
sensitivity to load variations. This feedback also produces
demand-driven current bias to the output transistors for
±120mA drive capability, while constraining total supply current to less than 7mA. The input stage permits
common-mode voltages beyond the negative supply and
to within 2.25V of the positive supply rail.
Applications Information
Choosing Resistor Values
The MAX4012/MAX4016/MAX4018/MAX4020 are internally compensated for unity gain. When configured for
unity gain, the devices require a 24Ω resistor (RF) in
series with the feedback path. This resistor improves
RF
MAX40_ _
IN
RTIN
Select the gain-setting feedback (RF) and input (RG)
resistor values to fit your application. Large resistor values increase voltage noise and interact with the amplifier’s input and PC board capacitance. This can generate
undesirable poles and zeros and decrease bandwidth or
cause oscillations. For example, a noninverting gain-oftwo configuration (RF = RG) using 1kΩ resistors, combined with 1pF of amplifier input capacitance and 1pF of
PC board capacitance, causes a pole at 159MHz. Since
this pole is within the amplifier bandwidth, it jeopardizes
stability. Reducing the 1kΩ resistors to 100Ω extends the
pole frequency to 1.59GHz, but could limit output swing
by adding 200Ω in parallel with the amplifier’s load resistor. Table 1 shows suggested feedback, gain resistors,
and bandwidth for several gain values in the configurations shown in Figures 1a and 1b.
These amplifiers operate from a single 3.3V to 11V power
supply or from dual supplies to ±5.5V. For single-supply
operation, bypass VCC to ground with a 0.1μF capacitor
as close to the pin as possible. If operating with dual supplies, bypass each supply with a 0.1μF capacitor.
IN
RTO
VOUT = [1+ (RF / RG)] VIN
Figure 1a. Noninverting Gain Configuration
www.analog.com
Inverting and Noninverting Configurations
Layout and Power-Supply Bypassing
Unity-Gain Configuration
RG
AC response by reducing the Q of the parallel LC circuit
formed by the parasitic feedback capacitance and inductance.
VOUT
RG
RTIN
RF
MAX40_ _
RO
RS
RTO
VOUT = -(RF / RG) VIN
VOUT
RO
Figure 1b. Inverting Gain Configuration
Analog Devices │ 10
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
Analog Devices recommends using microstrip and stripline techniques to obtain full bandwidth. To ensure that
the PC board does not degrade the amplifier’s performance, design it for a frequency greater than 1GHz.
Pay careful attention to inputs and outputs to avoid large
parasitic capacitance. Whether or not you use a constantimpedance board, observe the following guidelines when
designing the board:
●
Don’t use wire-wrap boards because they are too
inductive.
●
Don’t use IC sockets because they increase parasitic
capacitance and inductance.
●
Use surface-mount instead of through-hole components for better high-frequency performance.
●
Use a PC board with at least two layers; it should be
as free from voids as possible.
●
Keep signal lines as short and as straight as possible.
Do not make 90° turns; round all corners.
The output swings to within 60mV of either power-supply
rail with a 2kΩ load. The input ground-sensing and
the rail-to-rail output substantially increase the dynamic
range. With a symmetric input in a single 5V application,
the input can swing 2.95VP-P, and the output can swing
4.9VP-P with minimal distortion.
Enable Input and Disabled Output
The enable feature (EN_) allows the amplifier to be placed
in a low-power, high-output-impedance state. Typically,
the EN_ logic low input current (IIL) is small. However, as
the EN voltage (VIL) approaches the negative supply rail,
IIL increases (Figure 2). A single resistor connected as
shown in Figure 3 prevents the rise in the logic-low input
current. This resistor provides a feedback mechanism that
increases VIL as the logic input is brought to VEE. Figure
4 shows the resulting input current (IIL).
When the MAX4018 is disabled, the amplifier’s output
impedance is 35kΩ. This high resistance and the low
2pF output capacitance make this part ideal in RF/video
multiplexer or switch applications. For larger arrays, pay
careful attention to capacitive loading. See the Output
Capacitive Loading and Stability section for more information.
Rail-to-Rail Outputs,
Ground-Sensing Input
The input common-mode range extends from (VEE 200mV) to (VCC - 2.25V) with excellent common-mode
rejection. Beyond this range, the amplifier output is a nonlinear function of the input, but does not undergo phase
reversal or latchup.
Table 1. Recommended Component Values
GAIN (V/V)
COMPONENT
+1
-1
+2
-2
+5
-5
+10
-10
+25
-25
24
500
500
500
500
500
500
500
500
1200
RG (Ω)
∞
500
500
250
124
100
56
50
20
50
RS (Ω)
—
0
—
0
—
0
—
0
—
0
RTIN (Ω)
49.9
56
49.9
62
49.9
100
49.9
∞
49.9
∞
RTO (Ω)
49.9
49.9
49.9
49.9
49.9
49.9
49.9
49.9
49.9
49.9
Small-Signal -3dB Bandwidth (MHz)
200
90
105
60
25
33
11
25
6
10
RF (Ω)
Note: RL = RO + RTO; RTIN and RTO are calculated for 50Ω applications. For 75Ω systems, RTO = 75Ω; calculate RTIN from the
following equation:
=
R TIN
www.analog.com
75
Ω
75
1−
RG
Analog Devices │ 11
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
20
ENABLE
INPUT CURRENT (µA)
0
-20
10kΩ
-40
IN-
-60
EN_
MAX40_ _
-80
OUT
IN+
-100
-120
-140
-160
Figure 3. Circuit to Reduce Enable Logic-Low Input Current
0
50 100 150 200 250 300 350 400 450 500
mV ABOVE VEE
Figure 2. Enable Logic-Low Input Current vs. VIL
20
INPUT CURRENT (µA)
0
-20
-40
Output Capacitive Loading and Stability
-60
-80
-100
-120
-140
-160
To implement the mux function, the outputs of multiple
amplifiers can be tied together, and only the amplifier with
the selected input will be enabled. All of the other amplifiers will be placed in the low-power shutdown mode, with
their high output impedance presenting very little load to
the active amplifier output. For gains of +2 or greater, the
feedback network impedance of all the amplifiers used in
a mux application must be considered when calculating
the total load on the active amplifier output
0
50 100 150 200 250 300 350 400 450 500
mV ABOVE VEE
Figure 4. Enable Logic-Low Input Current vs. VIL with 10kΩ
Series Resistor
The MAX4012/MAX4016/MAX4018/MAX4020 are optimized for AC performance. They are not designed to drive
highly reactive loads, which decreases phase margin and
may produce excessive ringing and oscillation. Figure 5
shows a circuit that eliminates this problem. Figure 6 is
a graph of the optimal isolation resistor (RS) vs. capacitive load. Figure 7 shows how a capacitive load causes
excessive peaking of the amplifier’s frequency response if
the capacitor is not isolated from the amplifier by a resistor. A small isolation resistor (usually 20Ω to 30Ω) placed
before the reactive load prevents ringing and oscillation.
At higher capacitive loads, AC performance is controlled
by the interaction of the load capacitance and the isolation resistor. Figure 8 shows the effect of a 27Ω isolation
resistor on closed-loop response.
Coaxial cable and other transmission lines are easily
driven when properly terminated at both ends with their
characteristic impedance. Driving back-terminated transmission lines essentially eliminates the line’s capacitance.
www.analog.com
Analog Devices │ 12
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
RF
RG
MAX40_ _
RISO
VIN
RTIN
VOUT
CL
50Ω
ISOLATION RESISTANCE, RISO (Ω)
30
25
20
15
10
5
0
0
Figure 5. Driving a Capacitive Load through an Isolation Resistor
3
2
CL = 15pF
4
0
CL = 10pF
2
GAIN (dB)
GAIN (dB)
RISO = 27Ω
1
0
CL = 5pF
-1
250
CL = 47pF
1
3
-1
CL = 68pF
-2
CL = 120pF
-3
-4
-2
-5
-3
-6
-4
-7
100k
1M
10M
100M
1G
FREQUENCY (Hz)
Figure 7. Small-Signal Gain vs. Frequency with Load
Capacitance and No Isolation Resistor
www.analog.com
100
150
200
CAPACITIVE LOAD (pF)
Figure 6. Capacitive Load vs. Isolation Resistance
6
5
50
100k
1M
10M
100M
1G
FREQUENCY (Hz)
Figure 8. Small-Signal Gain vs. Frequency with Load
Capacitance and 27Ω Isolation Resistor
Analog Devices │ 13
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
Pin Configurations (continued)
TOP VIEW
ENA 1
14 OUTC
ENC 2
13 INC-
INA- 2
12 INC+
INA+ 3
11 VEE
VCC 4
INA+ 5
10 INB+
INB+ 5
10 INC+
INA- 6
9
INB-
INB- 6
9
INC-
OUTA 7
8
OUTB
OUTB 7
8
OUTC
ENB 3
VCC 4
MAX4018
SO
OUTA 1
INA-
2
INA+ 3
MAX4016
VEE 4
SO/µMAX
8
VCC
7
OUTB
6
INB-
5
INB+
13 IND12 IND+
MAX4020
11 VEE
SO
ENA 1
16 OUTC
ENC 2
15 INC-
INA- 2
14 INC+
INA+ 3
13 VEE
VCC 4
INA+ 5
12 INB+
INB+ 5
12 INC+
INA- 6
11 INB-
INB- 6
11 INC-
ENB 3
VCC 4
MAX4018
10 OUTB
OUTA 7
9 N.C.
N.C. 8
QSOP
www.analog.com
14 OUTD
OUTA 1
OUTA 1
16 OUTD
15 IND14 IND+
MAX4020
13 VEE
10 OUTC
OUTB 7
9 N.C.
N.C. 8
QSOP
Analog Devices │ 14
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
Ordering Information (continued)
PART
TEMP
RANGE
PINPACKAGE
MAX4018ESD+T
-40°C to +85°C
14 SO
MAX4018EEE+T
-40°C to +85°C
16 QSOP
MAX4020ESD+T
-40°C to +85°C
14 SO
MAX4020EEE+T
-40°C to +85°C
16 QSOP
TOP
MARK
—
—
—
—
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T Denotes tape-and-reel.
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
www.analog.com
Analog Devices │ 15
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
α
α
www.analog.com
Analog Devices │ 16
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
www.analog.com
Analog Devices │ 17
MAX4012/MAX4016/
MAX4018/MAX4020
Low-Cost, High-Speed, Single-Supply
Op Amps with Rail-to-Rail Outputs
Revision History
REVISION
NUMBER
REVISION
DATE
0
6/97
Initial release
—
1
8/01
Updated Electrical Characteristics table
2
2
10/03
Updated Electrical Characteristics table
3
DESCRIPTION
3
8/04
Added 8 SO package
4
8/22
Updated Ordering Information table, deleted Chip Information
PAGES
CHANGED
All
1, 15
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is
assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that
may result from its use. Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are
the property of their respective owners.
w w w . a n a l o g . c o m
Analog Devices │ 18
