19-1831; Rev 1; 1/09
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
The MAX4412 single and MAX4413 dual operational
amplifiers are unity-gain-stable devices that combine
high-speed performance, low supply current, and ultrasmall packaging. Both devices operate from a single
+2.7V to +5.5V supply, have rail-to-rail outputs, and
exhibit a common-mode input voltage range that
extends from 100mV below ground to within +1.5V of
the positive supply rail.
The MAX4412/MAX4413 achieve a 500MHz -3dB bandwidth and a 140V/µs slew rate while consuming only
1.7mA of supply current per amplifier. This makes the
MAX4412/MAX4413 ideal for low-power/low-voltage,
high-speed portable applications such as video, communications, and instrumentation.
For systems requiring tighter specifications, Maxim
offers the MAX4414–MAX4419 family of operational
amplifiers. The MAX4414–MAX4419 are laser trimmed
versions of the MAX4412/MAX4413 and include compensated and uncompensated devices.
The MAX4412 is available in ultra-small 5-pin SC70 and
SOT23 packages, while the MAX4413 is available in a
space-saving 8-pin SOT23.
Features
♦ Ultra-Low 1.7mA Supply Current
♦ Low Cost
♦ Single +3V/+5V Operation
♦ High Speed
500MHz -3dB Bandwidth
50MHz 0.1dB Gain Flatness
140V/µs Slew Rate
♦ Rail-to-Rail Outputs
♦ Input Common-Mode Range Extends Beyond VEE
♦ Low Differential Gain/Phase: 0.01%/0.03°
♦ Low Distortion at 5MHz
-93dBc SFDR
0.003% Total Harmonic Distortion
♦ Ultra-Small SC70 and SOT23 Packages
Ordering Information
________________________Applications
Battery-Powered Instruments
TOP
MARK
PINPACKAGE
PART
TEMP RANGE
Keyless Entry Systems
MAX4412EXK-T
-40°C to +85°C
5 SC70
ABH
Cellular Telephones
MAX4412EUK-T
-40°C to +85°C
5 SOT23
ADOL
MAX4413EKA-T
-40°C to +85°C
8 SOT23
AADR
Portable Communications
Video Line Drivers
-Denotes a package containing lead(Pb).
Baseband Applications
T = Tape and reel.
Pin Configurations
Typical Operating Characteristic
SUPPLY CURRENT vs.
SUPPLY VOLTAGE (PER AMPLIFER)
1.9
SUPPLY CURRENT (mA)
TOP VIEW
MAX4412 toc01
2.0
OUT
1.8
1.7
1
VEE 2
1.6
IN+
5
OUTA
1
INA-
2
7
OUTB
IN-
INA+
3
3
8
VCC
6
INB-
VEE 4
5
INB+
MAX4413
MAX4412
4
1.5
1.4
VCC
SC70/SOT23
1.3
SOT23
1.2
2.7
3.1
3.5
3.9 4.3
4.7
SUPPLY VOLTAGE (V)
5.1
5.5
________________________________________________________________ Maxim Integrated Products
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.
1
MAX4412/MAX4413
General Description
MAX4412/MAX4413
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE)..................................................+6V
Differential Input Voltage ....................................................±2.5V
IN_-, IN_+, OUT_..............................(VCC + 0.3V) to (VEE - 0.3V)
Current into Input Pins ......................................................±20mA
Output Short-Circuit Duration to VCC or VEE ..............Continuous
Continuous Power Dissipation (TA = +70°C)
5-Pin SC70 (derate 3.1mW/°C above +70°C) ..............247mW
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
8-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW
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
(VCC = +2.7V to +5.5V, VCM = VCC /2 - 0.75V, VEE = 0, 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
Operating Supply Voltage Range
VS
Quiescent Supply Current
(per amplifier)
IS
CONDITIONS
Guaranteed by PSRR test
MIN
TYP
2.7
VCC = +5V
1.7
VCC = +3V
1.5
UNITS
5.5
V
3.5
mA
Input Common Mode Voltage
Range
VCM
Input Offset Voltage
VOS
0.4
TCVOS
3
μV/°C
±1
mV
Input Offset Voltage Temperature
Coefficient
Input Offset Voltage Matching
Input Bias Current
Input Offset Current
Input Resistance
Common Mode Rejection Ratio
Guaranteed by CMRR test
MAX4413
V
9
mV
IB
1.6
4
μA
0.1
0.7
μA
RIN
CMRR
Differential mode,
-0.04V ≤ (VIN+ - VIN-) ≤ +0.04V
60
kΩ
Common mode,
VEE - 0.1V < VCM < VCC - 1.5V
16
MΩ
dB
VEE - 0.1V < VCM < VCC - 1.5V
AVOL
VCC = +3V
2
VCC 1.5
IOS
VCC = +5V
Open-Loop Gain
VEE 0.1
MAX
60
94
+0.2V ≤ VOUT ≤ +4.8V,
RL = 10kΩ
78
93
+0.4V ≤ VOUT ≤ +4.6V,
RL = 1kΩ
68
80
+1V ≤ VOUT ≤ +4V,
RL = 150Ω
65
+0.2V ≤ VOUT ≤ +2.8V,
RL = 10kΩ
90
+0.25V ≤ VOUT ≤ +2.75V
RL = 1kΩ
78
+0.5V ≤ VOUT ≤ +2.5V,
RL = 150Ω
62
dB
_______________________________________________________________________________________
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
(VCC = +2.7V to +5.5V, VCM = VCC /2 - 0.75V, VEE = 0, 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
RL = 10kΩ
VCC = +5V
Output Voltage Swing
RL = 1kΩ
RL =
150Ω
VOUT
RL = 10kΩ
VCC = +3V
RL = 1kΩ
RL =
150Ω
Output Current
IOUT
Output Short-Circuit Current
Power Supply Rejection Ratio
ISC
PSRR
MIN
TYP
MAX
VCC - VOH
0.085
VOL - VEE
0.015
VCC - VOH
0.105
0.275
VOL - VEE
0.035
0.125
VCC - VOH
0.385
VOL - VEE
0.150
VCC - VOH
0.06
VOL - VEE
0.01
VCC - VOH
0.075
VOL - VEE
0.025
VCC - VOH
0.275
VOL - VEE
RL = 20Ω connected to VCC or VEE, VCC = +5V
V
0.070
±25
Sinking or sourcing
VCC = +2.7V to +5.5V, VCM = 0, VOUT = 2V
UNITS
60
±75
mA
±85
mA
77
dB
AC ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = 0, VCM = +1.75V, RL = 1kΩ connected to VCC /2, CL = 5pF, AVCL = +1V/ V , TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Small Signal -3dB Bandwidth
BWSS
VOUT = 100mVp-p
500
MHz
Large Signal -3dB Bandwidth
BWLS
VOUT = 2Vp-p
30
MHz
Bandwidth for 0.1dB Flatness
BW0.1dB
VOUT = 100mVp-p
50
VOUT = 2Vp-p
16
Slew Rate
SR
MHz
VOUT = 2V step
140
V/µs
Rise/Fall Time
tR, tF
VOUT = 2V step, 10% to 90%
14
ns
Settling Time to 0.1%
tS 1%
VOUT = 2V step
100
ns
Spurious-Free Dynamic Range
SFDR
VCC = +5V, fC = 5MHz, VOUT = 1Vp-p
-84
VCC = +3V, fC = 5MHz, VOUT = 1Vp-p
-93
dBc
_______________________________________________________________________________________
3
MAX4412/MAX4413
DC ELECTRICAL CHARACTERISTICS (continued)
MAX4412/MAX4413
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = 0, VCM = +1.75V, RL = 1kΩ connected to VCC /2, CL = 5pF, AVCL = +1V/ V , TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
2nd Harmonic Distortion
3rd Harmonic Distortion
CONDITIONS
MIN
TYP
VCC = +5V, fC = 5MHz, VOUT = 1Vp-p
-84
VCC = +3V, fC = 5MHz, VOUT = 1Vp-p
-93
VCC = +5V, fC = 5MHz, VOUT = 1Vp-p
-95
VCC = +3V, fC = 5MHz, VOUT = 1Vp-p
-95
VCC = +5V, fC = 5MHz, VOUT = 1Vp-p
0.007
VCC = +3V, fC = 5MHz, VOUT = 1Vp-p
0.003
Total Harmonic Distortion
THD
Two-Tone, Third-Order
Intermodulation Distortion
IP3
f1 = 10MHz, f2 = 9.9MHz
Differential Gain Error
DG
RL = 150Ω, NTSC
Differential Phase Error
DP
RL = 150Ω, NTSC
MAX
dBc
dBc
%
-67
AV = +1V/V
0.03
AV = +2V/V
0.01
AV = +1V/V
0.13
AV = +2V/V
0.03
UNITS
dBc
%
degrees
Gain Matching
MAX4413, VOUT = 100mVp-p, f ≤ 10MHz
0.1
dB
Phase Matching
MAX4413, VOUT = 100mVp-p f ≤ 10MHz
0.1
degrees
Input Noise-Voltage Density
en
f = 10kHz
13
nV/√Hz
Input Noise-Current Density
In
f = 10kHz
0.7
pA/√ Hz
Input Capacitance
CIN
Output Impedance
ZOUT
Capacitive Load Drive
1.8
f = 1MHz
0.7
Ω
No sustained oscillations
120
pF
Power-Up 1% Settling Time
(Note 2)
Crosstalk
1.2
XTALK
pF
MAX4413, f = 10MHz, VOUT = 2Vp-p
100
-82
Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design.
Note 2: Guaranteed by design.
4
_______________________________________________________________________________________
µs
dB
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
1.7
1.6
1.5
1.4
22pF
0
-1
-2
-3
-4
3.1
3.5
3.9
4.7
4.3
SUPPLY VOLTAGE (V)
5.1
SMALL-SIGNAL GAIN WITH CAPACITIVE LOAD
and 22Ω ISOLATION RESISTOR vs. FREQUENCY
15pF
1
0
-1
5pF
-2
-2
1G
100k
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
0.5
0.3
0.4
0.2
0.1
0
-0.1
-0.2
0.3
0.1
-0.1
-0.4
-0.5
100k
-0.5
1M
FREQUENCY (Hz)
100M
100k
1G
135
60
VOUT = 2VP-P
-2
-3
90
GAIN
40
45
PHASE
20
0
0
-45
-20
-90
-6
-40
-135
-7
-60
-180
-4
-5
100k
1M
10M
FREQUENCY (Hz)
100M
1G
10k
100K
1M
10M
FREQUENCY (Hz)
100M
1G
PHASE (deg)
GAIN (dB)
0
DIFFERENTIAL GAIN (%)
180
AVCL = +1000V/V
80
DIFFERENTIAL PHASE (deg)
VOUT = 1VP-P
MAX4412 toc07
2
MAX4412 toc09
100
1M
10M
100M
1G
FREQUENCY (Hz)
GAIN AND PHASE vs. FREQUENCY
LARGE-SIGNAL GAIN vs. FREQUENCY
-1
10M
FREQUENCY (Hz)
3
1
VOUT = 2VP-P
-0.2
-0.4
1G
VOUT = 1VP-P
0
-4
100M
1G
0.2
-0.3
10M
100M
SMALL-SIGNAL
GAIN FLATNESS vs. FREQUENCY
-0.3
1M
10M
FREQUENCY (Hz)
-3
-5
100k
1M
FREQUENCY (Hz)
0.4
GAIN FLATNESS (dB)
22pF
2
100M
LARGE-SIGNAL GAIN (dB)
3
10M
MAX4412 toc05
4
0
-6
1M
0.5
MAX4412 toc04
5
15pF
2
5pF
-7
100k
5.5
4
DIFFERENTIAL GAIN AND PHASE
MAX4412 toc10
2.7
6
-4
-6
1.2
SMALL-SIGNAL GAIN (dB)
8
-5
1.3
MAX4412 toc03
1
SMALL-SIGNAL GAIN (dB)
1.8
10
MAX4412 toc02
2
SMALL-SIGNAL GAIN (dB)
1.9
SUPPLY CURRENT (mA)
3
MAX4412 toc01
2.0
LARGE-SIGNAL GAIN (dB)
SMALL-SIGNAL GAIN WITH CAPACATIVE LOAD
vs. FREQUENCY
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4412 toc06
SUPPLY CURRENT vs.
SUPPLY VOLTAGE (PER AMPLIFER)
0.04
0.03
0.02
0.01
0
0
10 20 30 40 50 60 70 80 90 100
IRE
0
10 20 30 40 50 60 70 80 90 100
0.15
0.10
0.05
0
IRE
_______________________________________________________________________________________
5
MAX4412/MAX4413
Typical Operating Characteristics
(VCC = +5V, VEE = 0, VCM = +1.75V, AVCL = +1V/V, RF = 24Ω, RL = 1kΩ to VCC/2, CL = 5pF, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = 1.75V, AVCL = +1V/V, RF = 24Ω, RL = 1kΩ to VCC/2, CL = 5pF, TA = +25°C, unless otherwise noted.)
SMALL-SIGNAL PULSE RESPONSE
LARGE-SIGNAL PULSE RESPONSE
OUTPUT
50mV/div
INPUT
500mV/div
OUTPUT
500mV/div
MAX4412 toc13
LARGE-SIGNAL PULSE RESPONSE
MAX4412 toc12
MAX4412 toc11
INPUT
50mV/div
INPUT
1V/div
OUTPUT
1V/div
RL = 1kΩ
RL = 1kΩ
RL = 1kΩ
SMALL-SIGNAL PULSE RESPONSE
LARGE-SIGNAL PULSE RESPONSE
SMALL-SIGNAL PULSE RESPONSE
(CL = 15pF)
INPUT
500mV/div
RL = 150Ω
INPUT
50mV/div
OUTPUT
50mV/div
OUTPUT
500mV/div
OUTPUT
50mV/div
MAX4412 toc16
50ns/div
MAX4412 toc15
50ns/div
MAX4412 toc14
50ns/div
INPUT
50mV/div
RL = 150Ω
50ns/div
50ns/div
50ns/div
MAX4412/MAX4413
CLOSED-LOOP OUTPUT IMPEDANCE
vs. FREQUENCY
MAX4413
CROSSTALK vs. FREQUENCY
MAX4412/MAX4413
SMALL SIGNAL BANDWIDTH
vs. LOAD RESISTANCE
CROSSTALK (dB)
10
-30
-40
-50
-60
-70
1
500
BANDWIDTH (MHz)
-20
-80
MAX4412 toc19
-10
100
600
MAX4412 toc18
0
MAX4412 toc17
1000
OUTPUT IMPEDANCE (Ω)
MAX4412/MAX4413
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
400
300
200
100
-90
100k
1M
10M
FREQUENCY (Hz)
6
0
-100
0.1
100M
1G
100k
1M
10M
FREQUENCY (Hz)
100M
1G
100
1000
RLOAD (Ω)
_______________________________________________________________________________________
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
OUTPUT VOLTAGE SWING vs.
LOAD RESISTANCE
60
40
-10
-20
-30
300
250
200
VOH
-70
VOL
-90
-80
0
0
1k
10k
-100
100
100k
1k
10k
100k
10M
100M
RLOAD (Ω)
FREQUENCY (Hz)
COMMON-MODE REJECTION vs.
FREQUENCY
VOLTAGE NOISE DENSITY vs.
FREQUENCY
CURRENT NOISE DENSITY vs.
FREQUENCY
-70
-80
-90
-100
10M
100M
1G
1
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
HARMONIC DISTORTION vs. FREQUENCY
HARMONIC DISTORTION vs.
OUTPUT VOLTAGE
-60
MAX4412 toc26
VOUT = 1Vp-p
-20
10
1
0
10
1M
MAX4412 toc25
MAX4412 toc24
100
1G
100
CURRENT NOISE DENSITY pA/√Hz
-60
1000
VOLTAGE NOISE DENSITY nV/√Hz
MAX4412 toc23
-50
0
1M
RLOAD (Ω)
-40
100k
-50
100
50
100
-40
-60
150
20
CMR (dB)
MAX4412 toc21
350
1
1M
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
HARMONIC DISTORTION vs.
LOAD RESISTANCE
f = 5MHz
0
-65
MAX4412 toc28
80
400
PSR (dB)
100
0
MAX4412 toc27
OPEN-LOOP GAIN (dB)
120
450
OUTPUT VOLTAGE SWING (mV)
MAX4412 toc20
140
POWER SUPPLY REJECTION
vs. FREQUENCY
MAX4412 toc22
OPEN-LOOP GAIN vs. LOAD RESISTANCE
VOUT = 1Vp-p, f = 5MHz
-20
-60
2nd HARMONIC
-80
DISTORTION (dBc)
-40
DISTORTION (dBc)
DISTORTION (dBc)
-70
-75
2nd HARMONIC
-80
-85
-40
-60
2nd HARMONIC
-80
-90
-100
-100
3rd HARMONIC
-95
3rd HARMONIC
3rd HARMONIC
-100
-120
100K
1M
10M
FREQUENCY (Hz)
100M
-120
0
0.5
1.0
1.5 2.0
2.5
OUTPUT VOLTAGE (Vp-p)
3.0
3.5
100
1K
10K
RLOAD (Ω)
________________________________________________________________________________________
7
MAX4412/MAX4413
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = 1.75V, AVCL = +1V/V, RF = 24Ω, RL = 1kΩ to VCC/2, CL = 5pF, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = 1.75V, AVCL = +1V/V, RF = 24Ω, RL = 1kΩ to VCC/2, CL = 5pF, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT (PER AMPLIFIER) vs.
TEMPERATURE
POWER-UP RESPONSE TIME
26
2.5
VSUPPLY
2.0V/div
24
0
22
20
18
+1.5V
16
VOUT
750mV/div
14
3.0
+5V
SUPPLY CURRENT (mA)
28
MAX4412 toc30
MAX4412 toc29
30
2.0
1.5
1.0
0.5
0
12
MAX4412 toc31
ISOLATION RESISTANCE vs.
CAPACITIVE LOAD
RISO (Ω)
10
0
0
200
400
600
800
1000
500ns/div
-50
-25
CLOAD (pF)
25
50
INPUT OFFSET CURRENT vs.
TEMPERATURE
2.0
1.5
1.0
MAX4412 toc33
2.5
100
90
INPUT OFFSET CURRENT (nA)
MAX4412 toc32
3.0
INPUT BIAS CURRENT (μA)
0
TEMPERATURE (°C)
INPUT BIAS CURRENT vs.
TEMPERATURE
0.5
80
70
60
50
40
30
20
10
0
0
-25
0
25
50
75
-25
0
25
50
75
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT OFFSET VOLTAGE vs.
TEMPERATURE
OUTPUT VOLTAGE SWING vs.
TEMPERATURE
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
250
100
MAX4412 toc35
MAX4412 toc34
1.0
225
200
175
150
VOH = VCC - VOUT
125
100
75
VOL = VOUT - VEE
50
25
0.1
0
0
-50
-25
0
25
50
TEMPERATURE (°C)
8
-50
100
OUTPUT VOLTAGE SWING (mV)
-50
INPUT OFFSET VOLTAGE (mV)
MAX4412/MAX4413
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
75
100
-50
-25
0
25
50
TEMPERATURE (°C)
_______________________________________________________________________________________
75
100
75
100
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
PIN
MAX4412
MAX4413
NAME
FUNCTION
1
⎯
OUT
⎯
1
OUTA
Amplifier A Output
⎯
7
OUTB
Amplifier B Output
2
4
VEE
Negative Power Supply
3
⎯
IN+
Amplifier Noninverting Input
⎯
3
INA+
⎯
5
INB+
4
⎯
IN-
⎯
2
INA-
⎯
6
INB-
Amplifier B Inverting Input
5
8
VCC
Positive Power Supply
Amplifier Output
Amplifier A Noninverting Input
Amplifier B Noninverting Input
Amplifier Inverting Input
Amplifier A Inverting Input
Detailed Description
The MAX4412/MAX4413 single-supply, rail-to-rail, voltage-feedback amplifiers achieve 140V/µs slew rates
and 500MHz -3dB bandwidths, while consuming only
1.7mA of supply current per amplifier. 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.
Internal feedback around the output stage ensures low
open-loop output impedance, reducing gain sensitivity
to load variations. This feedback also produces
demand-driven current bias to the output transistors.
Rail-to-Rail Outputs,
Ground-Sensing Input
The MAX4412/MAX4413 input common-mode range
extends from (VEE - 0.1V) to (VCC - 1.5V) 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.
The output swings to within 105mV of either power-supply rail with a 1kΩ load. Input ground sensing and railto-rail outputs substantially increase the dynamic
range. With a symmetric input in a single +5V application, the input can swing 3.6Vp-p, and the output can
swing 4.6Vp-p with minimal distortion.
Output Capacitive Loading
and Stability
The MAX4412/MAX4413 are optimized for AC performance. They are not designed to drive highly reactive
loads. Such loads decrease phase margin and may
produce excessive ringing and oscillation. The use of
an isolation resistor eliminates this problem (Figure 1).
Figure 2 is a graph of the Optimal Isolation Resistor
(RISO) vs. Capacitive Load.
The Small Signal Gain vs. Frequency with Capacitive
Load and No Isolation Resistor graph in the Typical
Operating Characteristics 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. The Small-Signal
Gain vs. Frequency with Capacitive Load and 22Ω
Isolation Resistor graph shows the effect of a 22Ω 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.
___________Applications Information
Choosing Resistor Values
Unity-Gain Configuration
The MAX4412/MAX4413 are internally compensated for
unity gain. When configured for unity gain, the devices
require a 24Ω feedback resistor (R F ). This resistor
improves AC response by reducing the Q of the parallel LC circuit formed by the parasitic feedback capacitance and inductance.
_______________________________________________________________________________________
9
MAX4412/MAX4413
Pin Description
Inverting and Noninverting Configurations
Select the gain-setting feedback (RF) and input (RG)
resistor values that best fit the 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-of-two configuration (RF = RG) using 1kΩ
resistors, combined with 1.8pF of amplifier input capacitance and 1pF of PC board capacitance, causes a
pole at 114MHz. Since this pole is within the amplifier
bandwidth, it jeopardizes stability. Reducing the 1kΩ
resistors to 100Ω extends the pole frequency to
1.14GHz, but could limit output swing by adding 200Ω
in parallel with the amplifier’s load resistor.
Note: For high-gain applications where output offset
voltage is a consideration, choose RS to be equal to the
parallel combination of RF and RG (Figures 3a and 3b):
RG
RS =
RF × RG
RF + RG
Video Line Driver
The MAX4412/MAX4413 are designed to minimize differential gain error and differential phase error to 0.01%/
0.03° respectively, making them ideal for driving video
loads.
Active Filters
The low distortion and high bandwidth of the
MAX4412/MAX4413 make them ideal for use in active
filter circuits. Figure 4 is a 15MHz lowpass, multiplefeedback active filter using the MAX4412.
GAIN =
R2
R1
RF
RISO
VIN
RF
RG
VOUT
CL
VOUT
RBIN
RS
R0
IN
VOUT = [1+ (RF / RG)] VIN
Figure 1. Driving a Capacitive Load Through an Isolation
Resistor
ISOLATION RESISTANCE vs.
CAPACITIVE LOAD
Figure 3a. Noninverting Gain Configuration
MAX4412 toc29
30
28
26
RG
RF
IN
24
RISO (Ω)
MAX4412/MAX4413
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
22
20
VOUT
18
16
RO
VOUT = (RF / RG) VIN
14
RS
12
10
0
200
400
600
800
1000
CLOAD (pF)
Figure 2. Isolation Resistance vs. Capacitive Load
10
Figure 3b. Inverting Gain Configuration
______________________________________________________________________________________
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
1
×
2π
1
R2 × R3 × C1 × C2
C2
Q =
C1 × C2 × R2 × R3
1
1
1
+
+
R1
R2
R3
ADC Input Buffer
Input buffer amplifiers can be a source of significant
errors in high-speed analog-to-digital converter (ADC)
applications. The input buffer is usually required to
rapidly charge and discharge the ADC’s input, which is
often capacitive (see Output Capacitive Loading and
Stability). In addition, since a high-speed ADC’s input
impedance often changes very rapidly during the conversion cycle, measurement accuracy must be maintained using an amplifier with very low output
impedance at high frequencies. The combination of
high speed, fast slew rate, low noise, and a low and
stable distortion overload makes the MAX4412/
MAX4413 ideally suited for use as buffer amplifiers in
high-speed ADC applications.
Layout and Power-Supply Bypassing
These amplifiers operate from a single +2.7V to +5.5V
power supply. Bypass V CC to ground with a 0.1µF
capacitor as close to the pin as possible.
Maxim recommends using microstrip and stripline techniques to obtain full bandwidth. Design the PC board
for a frequency greater than 1GHz to prevent amplifier
performance degradation due to board parasitics.
Avoid large parasitic capacitances at inputs and outputs. Whether or not a constant-impedance board is
used, observe the following guidelines:
• Do not use wire-wrap boards due to their high inductance.
• Do not use IC sockets because of the increased 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.
______________________________________________________________________________________
11
MAX4412/MAX4413
f0 =
MAX4412/MAX4413
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
+5.0V
C2
15pF
R2
150Ω
R3
511Ω
R1
150Ω
10k
VIN
VOUT
C1
100pF
MAX4412
10k
Figure 4. Multiple-Feedback Lowpass Filter
Chip Information
_
MAX4412 TRANSISTOR COUNT: 99
MAX4413 TRANSISTOR COUNT: 192
PROCESS: Bipolar
12
______________________________________________________________________________________
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
PACKAGE CODE
5 SC70
X5-1
DOCUMENT NO.
21-0076
5 SOT23
U5-2
21-0057
8 SOT23
K8-5
21-0078
SC70, 5L.EPS
PACKAGE TYPE
PACKAGE OUTLINE, 5L SC70
21-0076
E
1
1
______________________________________________________________________________________
13
MAX4412/MAX4413
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
SOT-23 5L .EPS
MAX4412/MAX4413
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
14
______________________________________________________________________________________
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
SOT23, 8L.EPS
MARKING
0
0
PACKAGE OUTLINE, SOT-23, 8L BODY
21-0078
H
1
1
______________________________________________________________________________________
15
MAX4412/MAX4413
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
MAX4412/MAX4413
Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz
Single-Supply Op Amps with Rail-to-Rail Outputs
Revision History
REVISION
NUMBER
REVISION
DATE
0
11/00
Initial release
1
1/09
Corrected slew rate value
DESCRIPTION
PAGES
CHANGED
—
1, 3, 9
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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2009 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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