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19-0468; Rev 2; 11/99
EVAALVUAAILTAIOBNLEKIT
330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
General Description
The MAX4178/MAX4278 are ±5V, wide-bandwidth, fast-
settling, closed-loop buffers featuring high slew rate, high
precision, high output current, low noise, and low differen-
tial gain and phase errors. The MAX4178, with a -3dB
bandwidth of 330MHz, is preset for unity voltage gain
(0dB). The MAX4278 is preset for a voltage gain of +2
(6dB) and has a 310MHz -3dB bandwidth.
The MAX4178/MAX4278 feature the high slew rate and
low power that are characteristic of current-mode feed-
back amplifiers. However, unlike conventional current-
mode feedback amplifiers, these devices have a
unique input stage that combines the benefits of cur-
rent-feedback topology with those of the traditional volt-
age-feedback topology. This combination results in low
input offset voltage and bias current, low noise, and
high gain precision and power-supply rejection.
The MAX4178/MAX4278 are ideally suited for driving
50or 75loads. They are the perfect choice for high-
speed cable-driving applications, such as video routing.
The MAX4178/MAX4278 are available in DIP, SO,
space-saving µMAX, and SOT23 packages.
________________________Applications
Broadcast and High-Definition TV Systems
Video Switching and Routing
High-Speed Cable Drivers
Communications
Medical Imaging
Precision High-Speed DAC/ADC Buffers
____________________________Features
o High Speed
330MHz -3dB Bandwidth (MAX4178)
310MHz -3dB Bandwidth (MAX4278)
250MHz Full-Power Bandwidth (VOUT = 2Vp-p)
150MHz 0.1dB Flatness Bandwidth
1300V/µs Slew Rate (MAX4178)
1600V/µs Slew Rate (MAX4278)
o Low Differential Phase/Gain Error: 0.01°/0.04%
o 8mA Supply Current
o 1µA Input Bias Current
o 0.5mV Input Offset Voltage
o 5nV/Hz Input-Referred Voltage Noise
o 2pA/Hz Input-Referred Current Noise
o 1.0% Max Gain Error with 100Load
o Short-Circuit Protected
o 8000V ESD Protection
o Available in Space-Saving SOT23 Package
Ordering Information
PART
TEMP. RANGE
PIN-
PACKAGE
SOT
TOP MARK
MAX4178EPA -40°C to +85°C 8 Plastic DIP
MAX4178ESA -40°C to +85°C 8 SO
MAX4178EUA -40°C to +85°C 8 µMAX
MAX4178EUK-T -40°C to +85°C 5 SOT23-5
ABYX
MAX4178MJA -55°C to +125°C 8 CERDIP
Ordering Information continued at end of data sheet.
Typical Operating Circuit
TOP VIEW
Pin Configurations
VIN
75
MAX4278
75
VIDEO/RF CABLE DRIVER
VOUT
75
OUT 1
VEE 2
IN 3
MAX4178
MAX4278
5 VCC N.C. 1
GND 2
IN 3
4 GND VEE 4
MAX4178
MAX4278
8 N.C.
7 VCC
6 OUT
5 N.C.
SOT23-5
DIP/SO/µMAX
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE) ..................................................12V
Input Voltage....................................(VCC + 0.3V) to (VEE - 0.3V)
Output Short-Circuit Duration (to GND) .....................Continuous
Continuous Power Dissipation (TA = +70°C)
SOT23 (derate 7.10mW/°C above +70°C) ..................571mW
Plastic DIP (derate 9.09mW/°C above +70°C) ...........727mW
SO (derate 5.88mW/°C above +70°C) ........................471mW
µMAX (derate 4.10mW/°C above +70°C) ...................330mW
CERDIP (derate 8.00mW/°C above +70°C) ................640mW
Operating Temperature Ranges (Note 1)
MAX4178E_A/MAX4278E_A ...........................-40°C to +85°C
MAX4178EUK/MAX4278EUK .........................-40°C to +85°C
MAX4178MJA/MAX4278MJA .......................-55°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: Specifications for the MAX4_78EUK (SOT23 packages) are 100% tested at TA = +25°C, and guaranteed by design over
temperature.
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, VOUT = 0, RL = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
MAX4178
VIN MAX4278
±2.5
±1.25
±3.0
±1.5
V
Input Offset Voltage
MAX4_78ESA/EPA/EUA/MJA
TA = +25°C MAX4_78EUK
VOS
TA =
MAX4_78ESA/EPA/EUA/MJA
TMIN to TMAX MAX4_78EUK
0.5 2.0
0.5 3.0
mV
3.0
5.0
Input Offset Voltage Drift
Input Bias Current
Input Resistance
TCVOS
IB
RIN
TA = +25°C
TA = TMIN to TMAX
2 µV/°C
13
µA
5
1 M
Power-Supply Rejection
Ratio
PSRR
VS = ±4.5V to ±5.5V
70 90
dB
Voltage Gain
Gain Linearity
Output Resistance
Minimum Output Current
Short-Circuit Output Current
Output Voltage Swing
Quiescent Supply Current
AV
AV(LIN)
ROUT
IOUT
ISC
VOUT
ISY
MAX4178 (Note 2)
MAX4278 (Note 3)
VOUT = ±1mV to ±2V
f = DC
TA = -40°C to +85°C
Short to GND
RL = 100
RL = 50
TA = +25°C
TA = TMIN to TMAX
RL = 100
RL = 50
RL = 100
RL = 50
MAX4_78E_ _
MAX4_78MJA
+0.990
+0.985
+1.98
+1.97
70
±2.5
±2.0
0.01
0.1
100
150
±3.0
±2.5
8
+1.000
+1.000
+2.01
+2.01
10
12
14
V/V
%
mA
mA
V
mA
Note 2: Voltage Gain = (VOUT - VOS) / VIN measured at VIN = ±2.5V.
Note 3: Voltage Gain = (VOUT - VOS) / VIN measured at VIN = ±1.25V.
2 ______________________________________________________________________________________

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330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
AC ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = -5V, RL = 100, TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Small-Signal, -3dB Bandwidth
BW VOUT 0.1Vp-p
MAX4178
MAX4278
330
MHz
310
Small-Signal, ±0.1dB Bandwidth BW(0.1dB) VOUT 0.1Vp-p
MAX4178
MAX4278
150
MHz
150
Full-Power Bandwidth
FPBW
VOUT = 2Vp-p
MAX4178
MAX4278
250
MHz
250
Slew Rate
SR VOUT = ±2Vp-p
MAX4178
MAX4278
1300
1600
V/µs
Settling Time
tS VOUT = 2V step
to 0.1%
to 0.01%
10
ns
12
Rise/Fall Times
Input Capacitance
Input Voltage Noise Density
tR, tF
CIN
en
VOUT = 2V step
f = 10MHz
2 ns
1 pF
5 nV/Hz
Input Current Noise Density
Differential Gain
(Note 4)
in f = 10MHz
DG f = 3.58MHz
MAX4178
MAX4278
2 pA/Hz
0.04
%
0.04
Differential Phase
(Note 4)
DP f = 3.58MHz
MAX4178
MAX4278
0.01
degrees
0.01
Total Harmonic Distortion
THD
fC = 10MHz,
VOUT = 2Vp-p
MAX4178
MAX4278
-58
dB
-59
Spurious-Free Dynamic Range
SFDR
MAX4178
f = 5MHz, VOUT = 2Vp-p MAX4278
-81
dBC
-74
Third-Order Intercept
IP3
fC = 10MHz,
VOUT = 2Vp-p
MAX4178
MAX4278
36
dBm
31
Note 4: Tested with a 3.58MHz video test signal with an amplitude of 40IRE superimposed on a linear ramp (0 to 100IRE). An IRE is
a unit of video signal amplitude developed by the Institute of Radio Engineers; 140IRE = 1V in color systems.
________________________________________________________________________________________ 3

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330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
__________________________________________Typical Operating Characteristics
(VCC = +5V, VEE = -5V, RL = 100, CL = 0pF, TA = +25°C, unless otherwise noted.)
MAX4178
SMALL-SIGNAL GAIN vs. FREQUENCY
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
1M
10M 100M
FREQUENCY (Hz)
1G
MAX4278
SMALL-SIGNAL GAIN vs. FREQUENCY
8
7
6
5
4
3
2
1
0
-1
-2
1M
10M 100M
FREQUENCY (Hz)
1G
MAX4178
SMALL-SIGNAL
PULSE RESPONSE (CL = 0pF)
MAX4178
GAIN FLATNESS vs. FREQUENCY
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-0.8
1M
10M 100M
FREQUENCY (Hz)
1G
MAX4278
GAIN FLATNESS vs. FREQUENCY
6.2
6.1
6.0
5.9
5.8
5.7
5.6
5.5
5.4
5.3
5.2
1M
10M 100M
FREQUENCY (Hz)
1G
MAX4178
LARGE-SIGNAL
PULSE RESPONSE (CL = 0pF)
MAX4178
LARGE-SIGNAL GAIN vs. FREQUENCY
3
2 VO = 2Vp-p
1
0
-1
-2
-3
-4
-5
-6
-7
1M
10M 100M
FREQUENCY (Hz)
1G
MAX4278
LARGE-SIGNAL GAIN vs. FREQUENCY
12
10 VO = 2Vp-p
8
6
4
2
0
-2
-4
-6
-8
1M
10M 100M
FREQUENCY (Hz)
1G
MAX4278
SMALL-SIGNAL
PULSE RESPONSE (CL = 0pF)
IN
IN GND IN GND (50mV/ GND
div)
OUT
OUT GND OUT GND (100mV/ GND
div)
TIME (10ns/div)
TIME (10ns/div)
TIME (10ns/div)
4 ______________________________________________________________________________________

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330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RL = 100, CL = 0pF, TA = +25°C, unless otherwise noted.)
MAX4278
LARGE-SIGNAL
PULSE RESPONSE (CL = 0pF)
MAX4178
SMALL-SIGNAL
PULSE RESPONSE (CL = 50pF)
MAX4178
LARGE-SIGNAL
PULSE RESPONSE (CL = 50pF)
IN
(1V/div)
GND IN
GND IN
GND
OUT
(2V/div)
GND OUT
GND OUT
GND
TIME (10ns/div)
MAX4178
SMALL-SIGNAL
PULSE RESPONSE (CL = 100pF)
TIME (20ns/div)
MAX4178
LARGE-SIGNAL
PULSE RESPONSE (CL = 100pF)
TIME (20ns/div)
MAX4278
SMALL-SIGNAL
PULSE RESPONSE (CL = 50pF)
IN
IN GND IN GND (50mV/ GND
div)
OUT
OUT GND OUT GND (100mV/ GND
div)
TIME (20ns/div)
MAX4278
LARGE-SIGNAL
PULSE RESPONSE (CL = 50pF)
TIME (20ns/div)
MAX4278
SMALL-SIGNAL
PULSE RESPONSE (CL = 100pF)
TIME (20ns/div)
MAX4278
LARGE-SIGNAL
PULSE RESPONSE (CL = 100pF)
IN
(1V/div)
OUT
(2V/div)
IN
GND (50mV/
div)
OUT
GND (100mV/
div)
IN
GND (1V/div)
OUT
GND (2V/div)
GND
GND
TIME (20ns/div)
TIME (20ns/div)
TIME (20ns/div)
_______________________________________________________________________________________ 5