_______________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
50
or 75
loads. They are the perfect choice for high-
speed cable-driving applications, such as video routing.
The MAX4178/MAX4278 are available in DIP, SO, and
space-saving MAX 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 (V
OUT
= 2Vp-p)
150MHz 0.1dB Flatness Bandwidth
1300V/s Slew Rate (MAX4178)
1600V/s Slew Rate (MAX4278)
o
Low Differential Phase/Gain Error: 0.01/0.04%
o
8mA Supply Current
o
1A Input Bias Current
o
0.5mV Input Offset Voltage
o
5nV/
H
Hzz
Input-Referred Voltage Noise
o
2pA/
H
Hzz
Input-Referred Current Noise
o
1.0% Max Gain Error with 100
Load
o
Short-Circuit Protected
o
8000V ESD Protection
o
Available in Space-Saving SOT23 Package
MAX4178/MAX4278
330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
________________________________________________________________
Maxim Integrated Products
1
19-0468; Rev 1; 5/97
PART
MAX4178
EPA
MAX4178ESA
MAX4178EUA
-40C to +85C
-40C to +85C
-40C to +85C
TEMP. RANGE
PIN-
PACKAGE
8 Plastic DIP
8 SO
8 MAX
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
______________Ordering Information
Ordering Information continued at end of data sheet.
DIP/SO/
MAX
TOP VIEW
OUT
IN
N.C.
V
EE
1
2
8
7
N.C.
V
CC
GND
N.C.
MAX4178
MAX4278
3
4
6
5
V
EE
GND
IN
1
5
V
CC
OUT
SOT23-5
2
3
4
MAX4178
MAX4278
MAX4278
V
IN
75
75
V
OUT
75
VIDEO/RF CABLE DRIVER
_________________Pin Configurations
__________Typical Operating Circuit
MAX4178MJA
-55C to +125C 8 CERDIP
MAX4178EUK-T
-40C to +85C
5 SOT23
SOT
TOP MARK
ABYX
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX4178/MAX4278
330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +5V, V
EE
= -5V, V
OUT
= 0V, R
L
=
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
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.
Supply Voltage (V
CC
to V
EE
) ..................................................12V
Input Voltage....................................(V
CC
+ 0.3V) to (V
EE
- 0.3V)
Output Short-Circuit Duration (to GND) .....................Continuous
Continuous Power Dissipation (T
A
= +70C)
Plastic DIP (derate 9.09mW/C above +70C) ...........727mW
SO (derate 5.88mW/C above +70C) ........................471mW
MAX (derate 4.10mW/C above +70C) ...................330mW
CERDIP (derate 8.00mW/C above +70C) ................640mW
SOT23 (derate 7.10mW/C above +70C) ..................571mW
Operating Temperature Ranges (Note 1)
MAX4178E_A/MAX4278E_A ...........................-40C to +85C
MAX4178EUK/MAX4278EUK .........................-40C to +85C
MAX4178MJA/MAX4278MJA .......................-55C to +125C
Storage Temperature Range .............................-65C to +160C
Lead Temperature (soldering, 10sec) .............................+300C
CONDITIONS
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
MAX4178
2.5
3.0
MAX4278
V
1.25
1.5
V
IN
Input Voltage Range
0.5
2.0
V/C
2
TCV
OS
Input Offset Voltage Drift
1
3
A
I
B
Input Bias Current
M
1
R
IN
Input Resistance
V
S
= 4.5V to 5.5V
dB
70
90
PSRR
Power-Supply Rejection
Ratio
0.990
1.000
MAX4178 (Note 2)
0.985
1.000
1.98
2.01
MAX4278 (Note 3)
V/V
1.97
2.01
A
V
Voltage Gain
V
OUT
= 1mV to 2V
%
0.01
A
V(LIN)
Gain Linearity
f = DC
0.1
R
OUT
Output Resistance
Short to GND
mA
150
I
SC
Short-Circuit Output Current
R
L
= 100
2.5
3.0
T
A
= +25C
R
L
= 100
R
L
= 50
R
L
= 100
R
L
= 50
R
L
= 50
V
2.0
2.5
V
OUT
Output Voltage Swing
T
A
= +25C
8
10
12
mA
14
T
A
= T
MIN
to T
MAX
I
SY
Quiescent Supply Current
MAX4_78E_ _
MAX4_78MJA
T
A
= -40C to +85C
mA
70
100
I
OUT
Minimum Output Current
3.0
T
A
= T
MIN
to T
MAX
5
Note 2:
Voltage Gain = (V
OUT
- V
OS
) / V
IN
measured at V
IN
= 2.5V.
Note 3:
Voltage Gain = (V
OUT
- V
OS
) / V
IN
measured at V
IN
= 1.25V.
T
A
= +25C
0.5
3.0
T
A
=
T
MIN
to T
MAX
5.0
mV
V
OS
Input Offset Voltage
MAX4_78ESA/EPA/EUA/MJA
MAX4_78EUK
MAX4_78ESA/EPA/EUA/MJA
MAX4_78EUK
Note 1:
Specifications for the MAX4_78EUK(SOT23 packages) are 100% tested at T
A
= +25C, and guaranteed by design over
temperature.
MHz
MAX4178/MAX4278
330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
_______________________________________________________________________________________
3
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +5V, V
EE
= -5V, R
L
= 100
, T
A
= +25C, unless otherwise noted.)
Note 4:
Minimum AC specifications are guaranteed by sample test on the MAX4_78ESA only.
Note 5:
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.
240
330
230
310
CONDITIONS
V
OUT
= 2V step
ns
2
t
R
, t
F
Rise/Fall Times
f = 10MHz
nV/
Hz
5
e
n
Input Voltage Noise Density
f = 10MHz
pA/
Hz
2
i
n
Input Current Noise Density
0.04
f = 3.58MHz
%
0.04
DG
Differential Gain
(Note 5)
f = 5MHz, V
OUT
= 2Vp-p
dB
C
-81
SFDR
Spurious-Free Dynamic Range
36
f
C
= 10MHz,
V
OUT
= 2Vp-p
dBm
31
IP3
Third-Order Intercept
UNITS
MIN
TYP
MAX
PARAMETER
MAX4278
30
150
MAX4178
MAX4278
250
V
OUT
= 2Vp-p
MHz
250
FPBW
Full-Power Bandwidth
MAX4178
to 0.01%
10
V
OUT
= 2V step
ns
12
t
S
Settling Time
to 0.1%
MAX4178
MAX4278
0.01
MAX4278
MAX4178
f = 3.58MHz
degrees
0.01
DP
Differential Phase
(Note 5)
-58
MAX4278
MAX4178
f
C
= 10MHz,
V
OUT
= 2Vp-p
dB
-59
THD
Total Harmonic Distortion
MAX4178
MAX4278
pF
1
C
IN
Input Capacitance
MAX4178
MAX4278
-74
MAX4178
MAX4278
30
150
SYMBOL
800
1300
MAX4178
900
1600
MAX4278
V/s
V
OUT
= 2Vp-p
SR
Slew Rate
(Note 4)
MHz
V
OUT
0.1Vp-p
BW
Small-Signal, -3dB Bandwidth
(Note 4)
MHz
V
OUT
0.1Vp-p
BW
(0.1dB)
Small-Signal, 0.1dB Bandwidth
(Note 4)
MAX4178/MAX4278
330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
4
_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(V
CC
= +5V, V
EE
= -5V, R
L
= 100
, C
L
= 0pF, T
A
= +25C, unless otherwise noted.)
2
-8
1M
10M
100M
1G
MAX4178
SMALL-SIGNAL GAIN vs. FREQUENCY
-5
-6
-7
0
-1
-2
-3
-4
1
MAX4178/4278-01
FREQUENCY (Hz)
GAIN (dB)
-0.7
1M
10M
100M
1G
MAX4178
GAIN FLATNESS vs. FREQUENCY
-0.4
-0.5
-0.6
-0.8
0.1
0
-0.1
-0.2
-0.3
0.2
MAX4178/4278-02
FREQUENCY (Hz)
GAIN (dB)
-6
1M
10M
100M
1G
MAX4178
LARGE-SIGNAL GAIN vs. FREQUENCY
-3
-4
-5
-7
2
1
0
-1
-2
3
MAX4178/4278-03
FREQUENCY (Hz)
GAIN (dB)
V
O
= 2Vp-p
-1
1M
10M
100M
1G
MAX4278
SMALL-SIGNAL GAIN vs. FREQUENCY
2
1
0
-2
7
6
5
4
3
8
MAX4178/4278-04
FREQUENCY (Hz)
GAIN (dB)
5.3
1M
10M
100M
1G
MAX4278
GAIN FLATNESS vs. FREQUENCY
5.6
5.5
5.4
5.2
6.1
6.0
5.9
5.8
5.7
6.2
MAX4178/4278-05
FREQUENCY (Hz)
GAIN (dB)
-6
1M
10M
100M
1G
MAX4278
LARGE-SIGNAL GAIN vs. FREQUENCY
0
-2
-4
-8
10
8
6
4
2
12
MAX4178/4278-06
FREQUENCY (Hz)
GAIN (dB)
V
O
= 2Vp-p
MAX4178 LARGE-SIGNAL
PULSE RESPONSE (C
L
= 0pF)
MAX4178/4278-08
TIME (10ns/div)
VOLTAGE (2V/div)
IN
OUT
GND
GND
MAX4278 SMALL-SIGNAL
PULSE RESPONSE (C
L
= 0pF)
MAX4178/4278-09
TIME (10ns/div)
VOLTAGE
IN
(50mV/
div)
OUT
(100mV/
div)
GND
GND
MAX4178 SMALL-SIGNAL
PULSE RESPONSE (C
L
= 0pF)
MAX4178/4278-07
TIME (10ns/div)
VOLTAGE (100mV/div)
IN
OUT
GND
GND
MAX4178/MAX4278
330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
_______________________________________________________________________________________
5
MAX4278 LARGE-SIGNAL
PULSE RESPONSE (C
L
= 0pF)
MAX4178/4278-10
TIME (10ns/div)
VOLTAGE
IN
(1V/div)
OUT
(2V/div)
GND
GND
MAX4178 SMALL-SIGNAL
PULSE RESPONSE (C
L
= 50pF)
MAX4178/4278-11
TIME (20ns/div)
VOLTAGE (100mV/div)
IN
OUT
GND
GND
MAX4178 LARGE-SIGNAL
PULSE RESPONSE (C
L
= 50pF)
MAX4178/4278-12
TIME (20ns/div)
VOLTAGE (2V/div)
IN
OUT
GND
GND
MAX4178 SMALL-SIGNAL
PULSE RESPONSE (C
L
= 100pF)
MAX4178/4278-13
TIME (20ns/div)
VOLTAGE (100mV/div)
IN
OUT
GND
GND
MAX4178 LARGE-SIGNAL
PULSE RESPONSE (C
L
= 100pF)
MAX4178/4278-14
TIME (20ns/div)
VOLTAGE (2V/div)
IN
OUT
GND
GND
MAX4278 SMALL-SIGNAL
PULSE RESPONSE (C
L
= 50pF)
MAX4178/4278-15
TIME (20ns/div)
VOLTAGE
IN
(50mV/
div)
OUT
(100mV/
div)
GND
GND
____________________________Typical Operating Characteristics (continued)
(V
CC
= +5V, V
EE
= -5V, R
L
= 100
, C
L
= 0pF, T
A
= +25C, unless otherwise noted.)
MAX4278 LARGE-SIGNAL
PULSE RESPONSE (C
L
= 50pF)
MAX4178/4278-16
TIME (20ns/div)
VOLTAGE
IN
(1V/div)
OUT
(2V/div)
GND
GND
MAX4278 SMALL-SIGNAL
PULSE RESPONSE (C
L
= 100pF)
MAX4178/4278-17
TIME (20ns/div)
VOLTAGE
IN
(50mV/
div)
OUT
(100mV/
div)
GND
GND
MAX4278 LARGE-SIGNAL
PULSE RESPONSE (C
L
= 100pF)
MAX4178/4278-18
TIME (20ns/div)
VOLTAGE
IN
(1V/div)
OUT
(2V/div)
GND
GND
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