19-0468; Rev 2; 11/99
KIT
ATION
EVALU
BLE
AVAILA
330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
General Description
____________________________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/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 100Ω Load
o
Short-Circuit Protected
o
8000V ESD Protection
o
Available in Space-Saving SOT23 Package
MAX4178/MAX4278
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
50Ω or 75Ω loads. 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
Ordering Information
PART
MAX4178EPA
MAX4178ESA
MAX4178EUA
MAX4178EUK-T
MAX4178MJA
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-
PACKAGE
8 Plastic DIP
8 SO
8 µMAX
5 SOT23-5
8 CERDIP
SOT
TOP MARK
—
—
—
ABYX
—
Ordering Information continued at end of data sheet.
Typical Operating Circuit
TOP VIEW
Pin Configurations
75Ω
V
IN
OUT
1
V
OUT
V
EE
2
75Ω
5
V
CC
N.C.
1
GND
2
IN
3
8
N.C.
V
CC
OUT
N.C.
MAX4278
MAX4178
MAX4278
4
GND
MAX4178
MAX4278
7
6
5
75Ω
IN
3
V
EE
4
VIDEO/RF CABLE DRIVER
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.
330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
MAX4178/MAX4278
ABSOLUTE MAXIMUM RATINGS
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
= +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 T
A
= +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
(V
CC
= +5V, V
EE
= -5V, V
OUT
= 0, R
L
=
∞,
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Input Voltage Range
SYMBOL
V
IN
MAX4178
MAX4278
T
A
= +25°C
Input Offset Voltage
V
OS
T
A
=
T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
1
V
S
= ±4.5V to ±5.5V
MAX4178 (Note 2)
Voltage Gain
A
V
MAX4278 (Note 3)
Gain Linearity
Output Resistance
Minimum Output Current
Short-Circuit Output Current
Output Voltage Swing
A
V(LIN)
R
OUT
I
OUT
I
SC
V
OUT
V
OUT
= ±1mV to ±2V
f = DC
T
A
= -40°C to +85°C
Short to GND
R
L
= 100Ω
R
L
= 50Ω
T
A
= +25°C
T
A
= T
MIN
to T
MAX
MAX4_78E_ _
MAX4_78MJA
±2.5
±2.0
70
R
L
= 100Ω
R
L
= 50Ω
R
L
= 100Ω
R
L
= 50Ω
70
+0.990
+0.985
+1.98
+1.97
0.01
0.1
100
150
±3.0
±2.5
8
10
12
14
90
+1.000
+1.000
+2.01
+2.01
MAX4_78ESA/EPA/EUA/MJA
MAX4_78EUK
MAX4_78ESA/EPA/EUA/MJA
MAX4_78EUK
2
1
3
5
CONDITIONS
MIN
±2.5
±1.25
TYP
±3.0
±1.5
0.5
0.5
2.0
3.0
3.0
5.0
µV/°C
µA
MΩ
dB
mV
MAX
UNITS
V
Input Offset Voltage Drift
Input Bias Current
Input Resistance
Power-Supply Rejection
Ratio
TCV
OS
I
B
R
IN
PSRR
V/V
%
Ω
mA
mA
V
Quiescent Supply Current
I
SY
mA
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.
2
______________________________________________________________________________________
330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +5V, V
EE
= -5V, R
L
= 100Ω, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Small-Signal, -3dB Bandwidth
Small-Signal, ±0.1dB Bandwidth
Full-Power Bandwidth
Slew Rate
Settling Time
Rise/Fall Times
Input Capacitance
Input Voltage Noise Density
Input Current Noise Density
Differential Gain
(Note 4)
Differential Phase
(Note 4)
Total Harmonic Distortion
Spurious-Free Dynamic Range
Third-Order Intercept
SYMBOL
BW
BW
(0.1dB)
FPBW
SR
t
S
t
R
, t
F
C
IN
e
n
i
n
DG
DP
THD
SFDR
IP3
f = 10MHz
f = 10MHz
f = 3.58MHz
f = 3.58MHz
f
C
= 10MHz,
V
OUT
= 2Vp-p
f = 5MHz, V
OUT
= 2Vp-p
f
C
= 10MHz,
V
OUT
= 2Vp-p
MAX4178
MAX4278
MAX4178
MAX4278
MAX4178
MAX4278
MAX4178
MAX4278
MAX4178
MAX4278
CONDITIONS
V
OUT
≤
0.1Vp-p
V
OUT
≤
0.1Vp-p
V
OUT
= 2Vp-p
V
OUT
= ±2Vp-p
V
OUT
= 2V step
V
OUT
= 2V step
MAX4178
MAX4278
MAX4178
MAX4278
MAX4178
MAX4278
MAX4178
MAX4278
to 0.1%
to 0.01%
MIN
TYP
330
310
150
150
250
250
1300
1600
10
12
2
1
5
2
0.04
0.04
0.01
0.01
-58
-59
-81
-74
36
31
MAX
UNITS
MHz
MHz
MHz
V/µs
ns
ns
pF
nV/√Hz
pA/√Hz
%
degrees
dB
dB
C
dBm
MAX4178/MAX4278
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
330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
MAX4178/MAX4278
__________________________________________Typical Operating Characteristics
(V
CC
= +5V, V
EE
= -5V, R
L
= 100Ω, C
L
= 0pF, T
A
= +25°C, unless otherwise noted.)
MAX4178
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4178/4278-01
MAX4178
GAIN FLATNESS vs. FREQUENCY
MAX4178/4278-02
MAX4178
LARGE-SIGNAL GAIN vs. FREQUENCY
2
1
0
GAIN (dB)
-1
-2
-3
-4
-5
-6
-7
V
O
= 2Vp-p
MAX4178/4278-03
2
1
0
-1
GAIN (dB)
-2
-3
-4
-5
-6
-7
-8
1M
10M
100M
0.2
0.1
0
-0.1
GAIN (dB)
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-0.8
3
1G
1M
10M
100M
1G
1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4278
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX4178/4278-04
MAX4278
GAIN FLATNESS vs. FREQUENCY
MAX4178/4278-05
MAX4278
LARGE-SIGNAL GAIN vs. FREQUENCY
10
8
6
GAIN (dB)
4
2
0
-2
-4
-6
-8
V
O
= 2Vp-p
MAX4178/4278-06
8
7
6
5
GAIN (dB)
6.2
6.1
6.0
5.9
GAIN (dB)
5.8
5.7
5.6
5.5
5.4
5.3
5.2
12
4
3
2
1
0
-1
-2
1M
10M
100M
1G
FREQUENCY (Hz)
1M
10M
100M
1G
1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4178
SMALL-SIGNAL
PULSE RESPONSE (C
L
= 0pF)
MAX4178/4278-07
MAX4178
LARGE-SIGNAL
PULSE RESPONSE (C
L
= 0pF)
MAX4178/4278-08
MAX4278
SMALL-SIGNAL
PULSE RESPONSE (C
L
= 0pF)
MAX4178/4278-09
VOLTAGE (100mV/div)
VOLTAGE (2V/div)
IN
GND
IN
GND
OUT
GND
OUT
OUT
GND (100mV/
div)
VOLTAGE
IN
(50mV/
div)
GND
GND
TIME (10ns/div)
TIME (10ns/div)
TIME (10ns/div)
4
______________________________________________________________________________________
330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
Typical Operating Characteristics (continued)
(V
CC
= +5V, V
EE
= -5V, R
L
= 100Ω, C
L
= 0pF, T
A
= +25°C, unless otherwise noted.)
MAX4278
LARGE-SIGNAL
PULSE RESPONSE (C
L
= 0pF)
MAX4178/4278-10
MAX4178/MAX4278
MAX4178
SMALL-SIGNAL
PULSE RESPONSE (C
L
= 50pF)
MAX4178/4278-11
MAX4178
LARGE-SIGNAL
PULSE RESPONSE (C
L
= 50pF)
MAX4178/4278-12
VOLTAGE (100mV/div)
OUT
(2V/div)
GND
VOLTAGE (2V/div)
IN
(1V/div)
VOLTAGE
GND
IN
GND
IN
GND
OUT
GND
OUT
GND
TIME (10ns/div)
TIME (20ns/div)
TIME (20ns/div)
MAX4178
SMALL-SIGNAL
PULSE RESPONSE (C
L
= 100pF)
MAX4178/4278-13
MAX4178
LARGE-SIGNAL
PULSE RESPONSE (C
L
= 100pF)
MAX4178/4278-14
MAX4278
SMALL-SIGNAL
PULSE RESPONSE (C
L
= 50pF)
MAX4178/4278-15
VOLTAGE (100mV/div)
VOLTAGE (2V/div)
IN
GND
IN
GND
OUT
GND
OUT
OUT
GND (100mV/
div)
VOLTAGE
IN
(50mV/
div)
GND
GND
TIME (20ns/div)
TIME (20ns/div)
TIME (20ns/div)
MAX4278
LARGE-SIGNAL
PULSE RESPONSE (C
L
= 50pF)
MAX4178/4278-16
MAX4278
SMALL-SIGNAL
PULSE RESPONSE (C
L
= 100pF)
MAX4178/4278-17
MAX4278
LARGE-SIGNAL
PULSE RESPONSE (C
L
= 100pF)
MAX4178/4278-18
IN
(1V/div)
VOLTAGE
GND
OUT
(2V/div)
OUT
GND (100mV/
div)
VOLTAGE
OUT
GND (2V/div)
VOLTAGE
IN
(50mV/
div)
IN
GND (1V/div)
GND
GND
TIME (20ns/div)
TIME (20ns/div)
TIME (20ns/div)
_______________________________________________________________________________________
5
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