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MAX4200–MAX4205
Ultra-High-Speed, Low-Noise, Low-Power,
SOT23 Open-Loop Buffers
General Description
The MAX4200–MAX4205 are ultra-high-speed, openloop buffers featuring high slew rate, high output current,
low noise, and excellent capacitive-load-driving capability.
The MAX4200/MAX4201/MAX4202 are single buffers,
while the MAX4203/MAX4204/MAX4205 are dual buffers.
The MAX4201/MAX4204 have integrated 50Ω termination
resistors, making them ideal for driving 50Ω transmission
lines. The MAX4202/MAX4205 include 75Ω backtermination resistors for driving 75Ω transmission lines.
The MAX4200/MAX4203 have no internal termination
resistors.
The MAX4200–MAX4205 use a proprietary architecture
to achieve up to 780MHz -3dB bandwidth, 280MHz 0.1dB
gain flatness, 4200V/μs slew rate, and ±90mA output current
drive capability. They operate from ±5V supplies and draw
only 2.2mA of quiescent current. These features, along
with low-noise performance, make these buffers suitable
for driving high-speed analog-to-digital converter (ADC)
inputs or for data-communications applications.
Features
●● 2.2mA Supply Current
●● High Speed
• 780MHz -3dB Bandwidth (MAX4201/MAX4202)
• 280MHz 0.1dB Gain Flatness (MAX4201/MAX4202)
• 4200V/μs Slew Rate
●● Low 2.1nV/√Hz Voltage-Noise Density
●● Low 0.8pA/√Hz Current-Noise Density
●● High ±90mA Output Drive (MAX4200/MAX4203)
●● Excellent Capacitive-Load-Driving Capability
●● Available in Space-Saving SOT23 or μMAX®
Packages
Applications
●●
●●
●●
●●
●●
High-Speed DAC Buffers
Wireless LANs
Digital-Transmission Line Drivers
High-Speed ADC Input Buffers
IF/Communications Systems
Typical Application Circuit
RT*
50Ω
50Ω CABLE
IN
OUT
MAX4201
*RL = RT + REXT
COAXIAL CABLE DRIVER
μMAX is a registered trademark of Maxim Integrated Products, Inc.
19-1338; Rev 4; 12/17
REXT*
50Ω
MAX4200–MAX4205
Ultra-High-Speed, Low-Noise, Low-Power,
SOT23 Open-Loop Buffers
Absolute Maximum Ratings
Supply Voltage (VCC to VEE)...............................................+12V
Voltage on Any Pin to GND............ (VEE - 0.3V) to (VCC + 0.3V)
Output Short-Circuit Duration to GND........................Continuous
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW
8-Pin μMAX (derate 4.1mW/°C above +70°C).............330mW
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
Operating Temperature Range............................ -40°C to +85°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)����������������������������������������+260°C
Junction Temperature.......................................................+150°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 = -5V, RL = ∞, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Operating Supply Voltage
Quiescent Supply Current
Input Offset Voltage
Input Offset Voltage Drift
SYMBOL
VS
Guaranteed by PSR test
IS
Per buffer, VIN = 0V
Input Resistance
Voltage Gain
Power-Supply Rejection
Output Resistance
Output Current
Short-Circuit Output Current
www.maximintegrated.com
TYP
±4
MAX
UNITS
±5.5
V
2.2
4
mA
VIN = 0V
1
15
mV
TCVOS
VIN = 0V
20
μV/°C
MAX4203/MAX4204/MAX4205
0.4
mV
RIN
(Note 1)
500
AV
-3.0V ≤
VOUT ≤
3.0V
IB
PSR
ROUT
IOUT
ISC
0.8
10
0.9
0.96
1.1
MAX4201/MAX4204, REXT = 50Ω
0.42
0.50
0.58
MAX4202/MAX4205, REXT = 75Ω
0.41
0.50
0.59
55
72
VS = ±4V to ±5.5V
f = DC
RL = 30Ω
Sinking or sourcing
VOUT
MAX4200/MAX4203
8
MAX4201/MAX4204
50
MAX4202/MAX4205
75
MAX4200/MAX4203
±90
MAX4201/MAX4204
±52
MAX4202/MAX4205
±44
MAX4200/MAX4203
150
MAX4201/MAX4204
90
MAX4202/MAX4205
75
RL = 150Ω
±3.3
±3.8
RL = 100Ω
±3.2
±3.7
RL = 37.5Ω
±3.3
MAX4201/MAX4204
RL = 50Ω
±1.9
±2.1
MAX4202/MAX4205
RL = 75Ω
±2.0
±2.3
μA
kΩ
MAX4200/MAX4203, REXT = 150Ω
MAX4200/MAX4203
Output-Voltage Swing
MIN
VOS
Input Offset Voltage
Matching
Input Bias Current
CONDITIONS
V/V
dB
Ω
mA
mA
V
Maxim Integrated │ 2
MAX4200–MAX4205
Ultra-High-Speed, Low-Noise, Low-Power,
SOT23 Open-Loop Buffers
AC Electrical Characteristics (continued)
(VCC = +5V, VEE = -5V, RL = 100Ω for MAX4200/MAX4201/MAX4203/MAX4204, RL = 150Ω for MAX4202/MAX4205, TA = TMIN to
TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
-3dB Bandwidth
0.1dB Bandwidth
Full-Power Bandwidth
Slew Rate
SYMBOL
BW(-3dB)
BW(0.1dB)
FPBW
SR
CONDITIONS
VOUT ≤ 100mVRMS
VOUT ≤ 100mVRMS
VOUT ≤ 2VP-P
MIN
MAX4200
660
MAX4201/MAX4202
780
MAX4203
530
MAX4204/MAX4205
720
MAX4200
220
MAX4201/MAX4202
280
MAX4203
130
MAX4204/MAX4205
230
MAX4200/MAX4201/MAX4202
490
MAX4203/MAX4204/MAX4205
310
VOUT = 2V step
Group Delay Time
Settling Time to 0.1%
Spurious-Free Dynamic
Range
Harmonic Distortion
tS
SFDR
HD
VOUT = 2V step
VOUT =
2VP-P
TYP
MAX4200/MAX4201/
MAX4202
MAX4203/MAX4204/
MAX4205
MAX
UNITS
MHz
MHz
MHz
4200
V/μs
405
ps
12
ns
f = 5MHz
-48
f = 20MHz
-45
f = 100MHz
-34
f = 5MHz
-47
f = 20MHz
-44
f = 100MHz
-32
MAX4200/MAX4201/
MAX4202, f = 500kHz,
VOUT = 2VP-P
Second harmonic
-72
Third harmonic
-48
Total harmonic
-48
MAX4203/MAX4204/
MAX4205, f = 500kHz,
VOUT = 2VP-P
Second harmonic
-83
Third harmonic
-47
Total harmonic
-47
dBc
dBc
Differential Gain Error
DG
NTSC, RL = 150Ω
1.3
%
Differential Phase Error
DP
NTSC, RL = 150Ω
0.15
degrees
Input Voltage-Noise Density
en
f = 1MHz
2.1
nV/√Hz
Input Current-Noise Density
in
f = 1MHz
0.8
pA/√Hz
2
pF
6
Ω
Input Capacitance
CIN
Output Impedance
ZOUT
Amplifier Crosstalk
XTALK
f = 10MHz
VOUT = 2VP-P
f = 10MHz
-87
f = 100MHz
-65
dB
Note 1: Tested with no load; increasing load will decrease input impedance.
www.maximintegrated.com
Maxim Integrated │ 3
MAX4200–MAX4205
Ultra-High-Speed, Low-Noise, Low-Power,
SOT23 Open-Loop Buffers
Typical Operating Characteristics
(VCC = +5V, VEE = -5V, RL = 100Ω for MAX4200/MAX4201/MAX4203/MAX4204, RL = 150Ω for MAX4202/MAX4205, unless otherwise
noted.)
0
-1
-2
-3
4
MAX4200/25-02
VOUT = 100mVP-P
2
1
0
-1
-2
-3
2
1
0
-1
-2
-3
-4
-4
-4
-5
-5
10M
100M
-6
1G
100k
1M
10M
100M
-6
1G
10M
100M
1G
MAX4203
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4204/MAX4205
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4203/MAX4204/MAX4205
LARGE-SIGNAL GAIN vs. FREQUENCY
-2
-3
4
2
1
0
-1
-2
-3
2
1
0
-1
-2
-3
-4
-4
-4
-5
-5
-5
1M
100M
10M
-6
1G
100k
1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
GROUP DELAY vs. FREQUENCY
POWER-SUPPLY REJECTION
vs. FREQUENCY
0
MAX4200/25-07
4
3
-10
-20
-30
1
-40
PSR (dB)
2
0
-1
-50
-60
5000
4000
3000
2000
-4
-90
1000
FREQUENCY (Hz)
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1G
10G
-100
100k
1M
10M
100M
FREQUENCY (Hz)
1G
6000
-80
100M
100M
7000
-3
10M
10M
8000
-70
1M
1M
1G
10G
SLEW RATE vs. OUTPUT VOLTAGE
9000
-2
100k
100k
FREQUENCY (Hz)
SLEW RATE (V/µs)
5
-6
10G
MAX4200/25-08
100k
VOUT = 2VP-P
3
NORMALIZED GAIN (dB)
0
-1
VOUT = 100mVP-P
MAX4200/4205-09
4
3
MAX4200/25-05
VOUT = 100mVP-P
MAX4200/25-06
FREQUENCY (Hz)
2
-5
1M
FREQUENCY (Hz)
1
-6
100k
FREQUENCY (Hz)
MAX4200/25-04
4
1M
VOUT = 2VP-P
3
-5
100k
MAX4200/MAX4201/MAX4202
LARGE-SIGNAL GAIN vs. FREQUENCY
MAX4200/25-03
MAX4201/MAX4202
SMALL-SIGNAL GAIN vs. FREQUENCY
NORMALIZED GAIN (dB)
NORMALIZED GAIN (dB)
3
NORMALIZED GAIN (dB)
NORMALIZED GAIN (dB)
2
3
NORMALIZED GAIN (dB)
VOUT = 100mVP-P
1
-6
GROUP DELAY (ns)
4
MAX4200/25-01
4
3
MAX4200
SMALL-SIGNAL GAIN vs. FREQUENCY
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
OUTPUT VOLTAGE (Vp-p)
Maxim Integrated │ 4
MAX4200–MAX4205
Ultra-High-Speed, Low-Noise, Low-Power,
SOT23 Open-Loop Buffers
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RL = 100Ω for MAX4200/MAX4201/MAX4203/MAX4204, RL = 150Ω for MAX4202/MAX4205, unless otherwise
noted.)
-30
-40
THIRD HARMONIC
-50
-60
-70
SECOND HARMONIC
-80
-90
100k
1M
10M
-40
THIRD HARMONIC
-50
-60
-70
-80
-100
100M
MAX4200/MAX4203
OUTPUT IMPEDANCE vs. FREQUENCY
100
MAX4200/4205-12
MAX4200/4205-11
-30
10
SECOND HARMONIC
-90
100k
1M
1
100M
10M
100k
10M
1M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4201/MAX4204
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4202/MAX4205
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4203/MAX4204/MAX4205
CROSSTALK vs. FREQUENCY
0
1G
MAX4200/4205-15
100
-10
-20
-30
CROSSTALK (dB)
MAX4200/4205-13
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
100
-20
OUTPUT IMPEDANCE (Ω)
-100
VOUT = 2Vp-p
-10
OUTPUT IMPEDANCE (Ω)
-20
0
MAX4203/MAX4204/MAX4205
HARMONIC DISTORTION vs. FREQUENCY
MAX4200/4205-14
HARMONIC DISTORTION (dBc)
MAX4200/4205-10
VIN = 2Vp-p
-10
HARMONIC DISTORTION (dBc)
0
MAX4200/MAX4201/MAX4202
HARMONIC DISTORTION vs. FREQUENCY
-40
-50
-60
-70
-80
-90
100k
100M
1
100k
10M
1M
100M
1G
-100
100k
1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
INPUT VOLTAGE-NOISE DENSITY
vs. FREQUENCY
INPUT CURRENT-NOISE DENSITY
vs. FREQUENCY
DIFFERENTIAL GAIN AND PHASE
(RL = 150Ω)
10
100
1k
10k 100k 1M
FREQUENCY (Hz)
www.maximintegrated.com
10M
1.5
1.0
0.5
0
-0.5
DIFF PHASE (deg)
1.0
0.1
1
10
100
1k
10k 100k
FREQUENCY (Hz)
1M
10M
10G
MAX4200/4205-18
MAX4200/4205-17
10
DIFF GAIN (%)
FREQUENCY (Hz)
10
1
10
1G
MAX4200/4205-16
VOLTAGE NOISE DENSITY (nV/√Hz)
100
10M
1M
CURRENT NOISE DENSITY (pA/√Hz)
10
0
100
0.20
0.15
0.10
0.05
0
-0.05
100
0
IRE
Maxim Integrated │ 5
MAX4200–MAX4205
Ultra-High-Speed, Low-Noise, Low-Power,
SOT23 Open-Loop Buffers
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RL = 100Ω for MAX4200/MAX4201/MAX4203/MAX4204, RL = 150Ω for MAX4202/MAX4205, unless otherwise
noted.)
OUTPUT VOLTAGE SWING vs.
EXTERNAL LOAD RESISTANCE
GAIN ERROR vs. INPUT VOLTAGE
10
8
6
RL = 100Ω
4
RL = 150Ω
2
0
-5
-4
-3
-2
-1
0
1
9
MAX4200/4203
8
7
6
4
MAX4202/4205
3
2
3
4
1
5
0
50
OUT
GND
100 150 200 250 300 350 400
MAX4201/MAX4202/MAX4204/MAX4205
SMALL-SIGNAL PULSE RESPONSE
MAX4200-22
TIME (5ns/div)
LARGE-SIGNAL PULSE RESPONSE
MAX4200-23
GND
IN
GND
MAX4200-24
GND
VOLTAGE
50mV/div
CLOAD = 15pF
GND
2
MAX4200/MAX4203
SMALL-SIGNAL PULSE RESPONSE
OUT
IN
VOLTAGE
50mV/div
5
EXTERNAL LOAD RESISTANCE (Ω)
VOLTAGE
50mV/div
MAX4200-21
MAX4201/4204
INPUT VOLTAGE (V)
IN
SMALL-SIGNAL PULSE RESPONSE
MAX4200-20
OUTPUT VOLTAGE SWING (Vp-p)
12
GAIN ERROR (%)
10
MAX4200-19
14
IN
GND
OUT
GND
VOLTAGE
1V/div
OUT
GND
CLOAD = 22pF
TIME (5ns/div)
www.maximintegrated.com
TIME (5ns/div)
TIME (5ns/div)
Maxim Integrated │ 6
MAX4200–MAX4205
Ultra-High-Speed, Low-Noise, Low-Power,
SOT23 Open-Loop Buffers
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RL = 100Ω for MAX4200/MAX4201/MAX4203/MAX4204, RL = 150Ω for MAX4202/MAX4205, unless otherwise
noted.)
MAX4200-26
IN
GND
VOLTAGE
1V/div
4.0
GND
VOLTAGE
1V/div
OUT
GND
GND
OUT
3.5
SUPPLY CURRENT (mA)
MAX4200-25
IN
SUPPLY CURRENT (PER BUFFER)
vs. TEMPERATURE
MAX4201/MAX4202/MAX4204/MAX4205
LARGE-SIGNAL PULSE RESPONSE
MAX4200-27
MAX4200/MAX4203
LARGE-SIGNAL PULSE RESPONSE
3.0
2.5
2.0
1.5
CLOAD = 15pF
CLOAD = 22pF
TIME (5ns/div)
1.0
TIME (5ns/div)
-40
-15
10
35
60
85
TEMPERATURE (°C)
1
0
-1
-2
-3
-4
3
VOLTAGE SWING (Vp-p)
2
4.0
MAX4200-29
3
4
INPUT BIAS CURRENT (µA)
INPUT OFFSET VOLTAGE (mV)
4
-5
5
MAX4200-28
5
MAX4200/MAX4203
OUTPUT VOLTAGE SWING
vs. TEMPERATURE
INPUT BIAS CURRENT
vs. TEMPERATURE
2
1
0
-1
-2
-3
MAX4200-30
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
RL = 150Ω
3.8
RL = 100Ω
3.6
3.4
3.2
-4
-40
-15
10
35
TEMPERATURE (°C)
www.maximintegrated.com
60
85
-5
-40
-15
10
35
TEMPERATURE (°C)
60
85
3.0
-40
-15
10
35
60
85
TEMPERATURE (°C)
Maxim Integrated │ 7
MAX4200–MAX4205
Ultra-High-Speed, Low-Noise, Low-Power,
SOT23 Open-Loop Buffers
Pin Configurations
TOP VIEW
N.C. 1
5 OUT
*RT
VEE 2
N.C. 1
8
N.C.
IN1 1
N.C. 2
7
VCC
OUT1 2
6
OUT
VEE1 3
5
N.C.
VEE2 4
*RT
IN 3
IN 3
MAX4203
MAX4204
MAX4205
MAX4200
MAX4201
MAX4202
MAX4200
MAX4201
MAX4202
4 VCC
VEE 4
*RT
VCC1
7
VCC2
6
OUT2
5
IN2
SO/µMAX
SO
SOT23-5
N.C. = NOT INTERNALLY CONNECTED
*RT
8
* RT = 0Ω (MAX4200/MAX4203)
RT = 50Ω (MAX4201/MAX4204)
RT = 75Ω (MAX4202/MAX4205)
Pin Description
PIN
MAX4200/MAX4201/MAX4202
MAX4203
MAX4204
MAX4205
NAME
FUNCTION
SOT23-5
SO
1
1, 2, 5, 8
—
N.C.
3
3
—
IN
Buffer Input
—
—
1
IN1
Buffer 1 Input
—
—
2
OUT1
2
4
—
VEE
Negative Power Supply
—
—
3
VEE1
Negative Power Supply for Buffer 1
—
—
4
VEE2
Negative Power Supply for Buffer 2
—
—
5
IN2
—
—
6
OUT2
Buffer 2 Output
5
6
—
OUT
Buffer Output
SO/µMAX
No Connection. Not Internally Connected
Buffer 1 Output
Buffer 2 Input
4
7
—
VCC
Positive Power Supply
—
—
7
VCC2
Positive Power Supply for Buffer 2
—
—
8
VCC1
Positive Power Supply for Buffer 1
www.maximintegrated.com
Maxim Integrated │ 8
MAX4200–MAX4205
Ultra-High-Speed, Low-Noise, Low-Power,
SOT23 Open-Loop Buffers
Detailed Description
The MAX4200–MAX4205 wide-band, open-loop buffers
feature high slew rates, high output current, low 2.1nV√Hz
voltage-noise density, and excellent capacitive-load-driving capability. The MAX4200/MAX4203 are single/dual
buffers with up to 660MHz bandwidth, 230MHz 0.1dB
gain flatness, and a 4200V/μs slew rate. The MAX4201/
MAX4204 single/dual buffers with integrated 50Ω output
termination resistors, up to 780MHz bandwidth, 280MHz
gain flatness, and a 4200V/μs slew rate, are ideally suited
for driving high-speed signals over 50Ω cables. The
MAX4202/MAX4205 provide bandwidths up to 720MHz,
230MHz gain flatness, 4200V/μs slew rate, and integrated
75Ω output termination resistors for driving 75Ω cables.
With an open-loop gain that is slightly less than +1V/V,
these devices do not have to be compensated with the
internal dominant pole (and its associated phase shift)
that is present in voltage-feedback devices. This feature
allows the MAX4200–MAX4205 to achieve a nearly constant group delay time of 405ps over their full frequency
range, making them well suited for a variety of RF and IF
signal-processing applications.
These buffers operate with ±5V supplies and consume
only 2.2mA of quiescent supply current per buffer while
providing up to ±90mA of output current drive capability.
●●
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.
Input Impedance
The MAX4200–MAX4205 input impedance looks like
a 500kΩ resistor in parallel with a 2pF capacitor. Since
these devices operate without negative feedback, there
is no loop gain to transform the input impedance upward,
as in closed-loop buffers. As a consequence, the input
impedance is directly related to the output impedance. If
the output load impedance decreases, the input impedance also decreases. Inductive input sources (such as an
unterminated cable) may react with the input capacitance
and produce some peaking in the buffer’s frequency
response. This effect can usually be minimized by using
a properly terminated transmission line at the buffer input,
as shown in Figure 1.
50Ω COAX
R T*
SOURCE
RL
50Ω
MAX42_ _
Applications Information
Power Supplies
The MAX4200–MAX4205 operate with dual supplies from
±4V to ±5.5V. Both VCC and VEE should be bypassed to
the ground plane with a 0.1μF capacitor located as close
to the device pin as possible.
Layout Techniques
Maxim 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 6GHz. 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:
●●
Do not use wire-wrap boards, because they are too
inductive.
●●
Do not use IC sockets, because they increase parasitic capacitance and inductance.
●●
Use surface-mount instead of through-hole components for better high-frequency performance.
www.maximintegrated.com
*MAX4201/4202/4204/4205 ONLY
Figure 1. Using a Properly Terminated Input Source
Output Current and Gain Sensitivity
The absence of negative feedback means that open-loop
buffers have no loop gain to reduce their effective output
impedance. As a result, open-loop devices usually suffer
from decreasing gain as the output current is decreased.
The MAX4200–MAX4205 include local feedback around
the buffer’s class-AB output stage to ensure low output
impedance and reduce gain sensitivity to load variations.
This feedback also produces demand-driven current bias
to the output transistors for ±90mA (MAX4200/MAX4203)
drive capability that is relatively independent of the output
voltage (see Typical Operating Characteristics).
Maxim Integrated │ 9
MAX4200–MAX4205
Ultra-High-Speed, Low-Noise, Low-Power,
SOT23 Open-Loop Buffers
Output Capacitive Loading and Stability
The MAX4200–MAX4205 provide maximum AC performance with no load capacitance. This is the case
when the load is a properly terminated transmission line.
However, these devices are designed to drive any load
capacitance without oscillating, but with reduced AC performance.
Since the MAX4200–MAX4205 operate in an openloop configuration, there is no negative feedback to be
transformed into positive feedback through phase shift
introduced by a capacitive load. Therefore, these devices
will not oscillate with capacitive loading, unlike similar
buffers operating in a closed-loop configuration. However,
a capacitive load reacting with the buffer’s output impedance can still affect circuit performance. A capacitive load
will form a lowpass filter with the buffer’s output resistance,
thereby limiting system bandwidth. With higher capacitive
loads, bandwidth is dominated by the RC network formed
by RT and CL; the bandwidth of the buffer itself is much
higher. Also note that the isolation resistor forms a divider
that decreases the voltage delivered to the load.
Another concern when driving capacitive loads results
from the amplifier’s output impedance, which looks inductive at high frequency. This inductance forms an L-C resonant circuit with the capacitive load and causes peaking in
the buffer’s frequency response.
www.maximintegrated.com
Figure 2 shows the frequency response of the MAX4200/
MAX4203 under different capacitive loads. To settle
out some of the peaking, the output requires an isolation resistor like the one shown in Figure 3. Figure 4 is
a plot of the MAX4200/MAX4203 frequency response
with capacitive loading and a 10Ω isolation resistor.
In many applications, the output termination resistors
included in the MAX4201/MAX4202/ MAX4204/MAX4205
will serve this purpose, reducing component count and
board space. Figure 5 shows the MAX4201/MAX4202/
MAX4204/MAX4205 frequency response with capacitive
loads of 47pF, 68pF, and 120pF.
Coaxial Cable Drivers
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.
The MAX4201/MAX4204, with their integrated 50Ω output
termination resistors, are ideal for driving 50Ω cables.
The MAX4202/MAX4205 include integrated 75Ω termination resistors for driving 75Ω cables. Note that the output
termination resistor forms a voltage divider with the load
resistance, thereby decreasing the amplitude of the signal at the receiving end of the cable by one half (see the
Typical Application Circuit).
Maxim Integrated │ 10
5
4
VOUT = 100mVP-P
CL = 47pF
CL = 68pF
3
2
GAIN (dB)
Ultra-High-Speed, Low-Noise, Low-Power,
SOT23 Open-Loop Buffers
MAX4200-FIG02
MAX4200–MAX4205
CL = 120pF
1
RISO
VIN
0
VOUT
CL
-1
-2
-3
MAX4200
MAX4203
CL = 220pF
-4
-5
100k
10M
1M
100M
1G
FREQUENCY (Hz)
3
GAIN (dB)
2
CL = 68pF
0
-1
-2
3
CL = 47pF
1
CL = 68pF
0
-1
CL = 120pF
-2
CL = 120pF
-3
VOUT = 100mVP-P
2
CL = 47pF
1
-3
-4
-5
5
4
MAX4200-FIG05
RISO = 10Ω
VOUT = 100mVP-P
GAIN (dB)
5
4
Figure 3. Driving a Capacitive Load Through an Isolation
Resistor
MAX4200-FIG04
Figure 2. MAX4200/MAX4203 Small-Signal Gain vs.
Frequency with Load Capacitance and No Isolation Resistor
-4
100k
1M
10M
100M
1G
FREQUENCY (Hz)
Figure 4. MAX4200/MAX4203 Small-Signal Gain vs.
Frequency with Load Capacitance and 10Ω Isolation Resistor
www.maximintegrated.com
-5
100k
1M
10M
100M
1G
FREQUENCY (Hz)
Figure 5. MAX4201/MAX4202/MAX4204/MAX4205 SmallSignal Gain vs. Frequency with Capacitive Load and No
External Isolation Resistor
Maxim Integrated │ 11
MAX4200–MAX4205
Ultra-High-Speed, Low-Noise, Low-Power,
SOT23 Open-Loop Buffers
Selector Guide
Ordering Information
PART
PIN-PACKAGE
TOP
MARK
PKG
CODE
—
S8-2
AABZ
U5-1
—
S8-2
ABAA
U5-1
—
S8-2
ABAB
U5-1
MAX4200ESA
8 SO
MAX4200EUK-T
5 SOT23-5
MAX4201ESA
8 SO
MAX4201EUK-T
5 SOT23-5
MAX4202ESA
8 SO
MAX4202EUK-T
5 SOT23-5
MAX4203ESA
8 SO
—
S8-2
MAX4203EUA-T
8 µMAX-8
—
U8-1
MAX4204ESA
8 SO
—
S8-2
MAX4204EUA-T
8 µMAX-8
—
U8-1
MAX4205ESA
8 SO
—
S8-2
MAX4205EUA-T
8 µMAX-8
—
U8-1
Note: All devices are specified over the -40°C to +85°C operating temperature range.
Chip Information
TRANSISTOR COUNTS:
INTERNAL
OUTPUT
TERMINATION
(Ω)
PIN-PACKAGE
PART
NO. OF
BUFFERS
MAX4200
1
—
8 SO, 5 SOT23
MAX4201
1
50
8 SO, 5 SOT23
MAX4202
1
70
8 SO, 5 SOT23
MAX4203
2
—
8 SO/μMAX
MAX4204
2
50
8 SO/μMAX
MAX4205
2
75
8 SO/μMAX
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.
PACKAGE PACKAGE
TYPE
CODE
OUTLINE NO.
LAND PATTERN
NO.
8-SOIC
S8-2
21-0041
90-0096
MAX4200/MAX4201/MAX4202: 33
5-SOT23
U5-1
21-0052
90-0174
MAX4203/MAX4204/MAX4205: 67
8-µMAX
U8-1
21-0036
90-0092
SUBSTRATE CONNECTED TO VEE
www.maximintegrated.com
Maxim Integrated │ 12
MAX4200–MAX4205
Ultra-High-Speed, Low-Noise, Low-Power,
SOT23 Open-Loop Buffers
Revision History
REVISION
NUMBER
REVISION
DATES
4
12/17
DESCRIPTION
Updated Absolute Maximum Ratings section
PAGES
CHANGED
2
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2017 Maxim Integrated Products, Inc. │ 13