LM6181
100 mA, 100 MHz Current Feedback Amplifier
General Description
The LM6181 current-feedback amplifier offers an unparal-
leled combination of bandwidth, slew-rate, and output cur-
rent. The amplifier can directly drive up to 100 pF capacitive
loads without oscillating and a 10V signal into a 50
or 75
back-terminated coax cable system over the full industrial
temperature range. This represents a radical enhancement
in output drive capability for an 8-pin DIP high-speed ampli-
fier making it ideal for video applications.
Built on National's advanced high-speed VIP
TM
II (Vertically
Integrated PNP) process, the LM6181 employs current-
feedback providing bandwidth that does not vary dramati-
cally with gain; 100 MHz at A
V
= -1, 60 MHz at A
V
= -10.
With a slew rate of 2000V/s, 2nd harmonic distortion of -50
dBc at 10 MHz and settling time of 50 ns (0.1%) the LM6181
dynamic performance makes it ideal for data acquisition,
high speed ATE, and precision pulse amplifier applications.
Features
(Typical unless otherwise noted)
n
Slew rate:
2000 V/s
n
Settling time (0.1%):
50 ns
n
Characterized for supply ranges:
5V and
15V
n
Low differential gain and phase error:
0.05%, 0.04
n
High output drive:
10V into 100
n
Guaranteed bandwidth and slew rate
n
Improved performance over EL2020, OP160, AD844,
LT1223 and HA5004
Applications
n
Coax cable driver
n
Video amplifier
n
Flash ADC buffer
n
High frequency filter
n
Scanner and Imaging systems
Typical Application
VIP
TM
is a registered trademark of National Semiconductor Corporation.
DS011328-1
Cable Driver
DS011328-2
May 1998
LM6181
100
mA,
100
MHz
Current
Feedback
Amplifier
1999 National Semiconductor Corporation
DS011328
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
18V
Differential Input Voltage
6V
Input Voltage
Supply Voltage
Inverting Input Current
15 mA
Soldering Information
Dual-In-Line Package (N)
Soldering (10 sec)
260C
Small Outline Package (M)
Vapor Phase (60 seconds)
215C
Infrared (15 seconds)
220C
Output Short Circuit
(Note 7)
Storage Temperature Range
-65C
T
J
+150C
Maximum Junction Temperature
150C
ESD Rating (Note 2)
3000V
Operating Ratings
Supply Voltage Range
7V to 32V
Junction Temperature Range (Note 3)
LM6181AM
-55C
T
J
+125C
LM6181AI, LM6181I
-40C
T
J
+85C
Thermal Resistance (
JA
,
JC
)
8-pin DIP (N)
102C/W, 42C/W
8-pin SO (M-8)
153C/W, 42C/W
16-pin SO (M)
70C/W, 38C/W
15V DC Electrical Characteristics
The following specifications apply for Supply Voltage =
15V, R
F
= 820
, and R
L
= 1 k
unless otherwise noted. Boldface
limits apply at the temperature extremes; all other limits T
J
= 25C.
Symbol
Parameter
Conditions
LM6181AM
LM6181AI
LM6181I
Units
Typical
Limit
Typical
Limit
Typical
Limit
(Note 4)
(Note 5)
(Note 4)
(Note 5)
(Note 4)
(Note 5)
V
OS
Input Offset Voltage
2.0
3.0
2.0
3.0
3.5
5.0
mV
4.0
3.5
5.5
max
TC
V
OS
Input Offset Voltage Drift
5.0
5.0
5.0
V/C
I
B
Inverting Input Bias Current
2.0
5.0
2.0
5.0
5.0
10
A
max
12.0
12.0
17.0
Non-Inverting Input Bias Current
0.5
1.5
0.5
1.5
2.0
3.0
3.0
3.0
5.0
TC I
B
Inverting Input Bias Current Drift
30
30
30
nA/C
Non-Inverting Input Bias
10
10
10
Current Drift
I
B
Inverting Input Bias Current
V
S
=
4.5V,
16V
0.3
0.5
0.3
0.5
0.3
0.75
A/V
max
PSR
Power Supply Rejection
3.0
3.0
4.5
Non-Inverting Input Bias Current
V
S
=
4.5V,
16V
0.05
0.5
0.05
0.5
0.05
0.5
Power Supply Rejection
1.5
1.5
3.0
I
B
Inverting Input Bias Current
-10V
V
CM
+10V
0.3
0.5
0.3
0.5
0.3
0.75
CMR
Common Mode Rejection
0.75
0.75
1.0
Non-Inverting Input Bias Current
-10V
V
CM
+10V
0.1
0.5
0.1
0.5
0.1
0.5
Common Mode Rejection
0.5
0.5
0.5
CMRR
Common Mode Rejection Ratio
-10V
V
CM
+10V
60
50
60
50
60
50
dB
50
50
50
min
PSRR
Power Supply Rejection Ratio
V
S
=
4.5V,
16V
80
70
80
70
80
70
dB
70
70
65
min
R
O
Output Resistance
A
V
= -1, f = 300 kHz
0.2
0.2
0.2
R
IN
Non-Inverting Input Resistance
10
10
10
M
min
V
O
Output Voltage Swing
R
L
= 1 k
12
11
12
11
12
11
V
min
11
11
11
R
L
= 100
11
10
11
10
11
10
7.5
8.0
8.0
I
SC
Output Short Circuit Current
130
100
130
100
130
100
mA
75
85
85
min
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2
15V DC Electrical Characteristics
(Continued)
The following specifications apply for Supply Voltage =
15V, R
F
= 820
, and R
L
= 1 k
unless otherwise noted. Boldface
limits apply at the temperature extremes; all other limits T
J
= 25C.
Symbol
Parameter
Conditions
LM6181AM
LM6181AI
LM6181I
Units
Typical
Limit
Typical
Limit
Typical
Limit
(Note 4)
(Note 5)
(Note 4)
(Note 5)
(Note 4)
(Note 5)
Z
T
Transimpedance
R
L
= 1 k
1.8
1.0
1.8
1.0
1.8
0.8
0.5
0.5
0.4
M
R
L
= 100
1.4
0.8
1.4
0.8
1.4
0.7
min
0.4
0.4
0.35
I
S
Supply Current
No Load, V
O
= 0V
7.5
10
7.5
10
7.5
10
mA
10
10
10
max
V
CM
Input Common Mode
V
+
- 1.7V
V
+
- 1.7V
V
+
- 1.7V
V
Voltage Range
V
-
+ 1.7V
V
-
+ 1.7V
V
-
+ 1.7V
15V AC Electrical Characteristics
The following specifications apply for Supply Voltage =
15V, R
F
= 820
, R
L
= 1 k
unless otherwise noted. Boldface limits
apply at the temperature extremes; all other limits T
J
= 25C.
Symbol
Parameter
Conditions
LM6181AM
LM6181AI
LM6181I
Units
Typical
Limit
Typical
Limit
Typical
Limit
(Note 4)
(Note 5)
(Note 4)
(Note 5)
(Note 4)
(Note 5)
BW
Closed Loop Bandwidth
A
V
= +2
100
100
100
MHz
min
-3 dB
A
V
= +10
80
80
80
A
V
= -1
100
80
100
80
100
80
A
V
= -10
60
60
60
PBW
Power Bandwidth
A
V
= -1, V
O
= 5 V
PP
60
60
60
SR
Slew Rate
Overdriven
2000
2000
2000
V/s
min
A
V
= -1, V
O
=
10V,
1400
1000
1400
1000
1400
1000
R
L
= 150
(Note 6)
t
s
Settling Time (0.1%)
A
V
= -1, V
O
=
5V
50
50
50
ns
R
L
= 150
t
r
, t
f
Rise and Fall Time
V
O
= 1 V
PP
5
5
5
t
p
Propagation Delay Time
V
O
= 1 V
PP
6
6
6
i
n(+)
Non-Inverting Input Noise
f = 1 kHz
3
3
3
Current Density
i
n(-)
Inverting Input Noise
f = 1 kHz
16
16
16
Current Density
e
n
Input Noise Voltage
Density
f = 1 kHz
4
4
4
Second Harmonic Distortion
2 V
PP
, 10 MHz
-50
-50
-50
dBc
Third Harmonic Distortion
2 V
PP
, 10 MHz
-55
-55
-50
Differential Gain
R
L
= 150
A
V
= +2
0.05
0.05
0.05
%
NTSC
Differential Phase
R
L
= 150
A
V
= +2
0.04
0.04
0.04
Deg
NTSC
www.national.com
3
5V DC Electrical Characteristics
The following specifications apply for Supply Voltage =
5V, R
F
= 820
, and R
L
= 1 k
unless otherwise noted. Boldface
limits apply at the temperature extremes; all other limits T
J
= 25C.
Symbol
Parameter
Conditions
LM6181AM
LM6181AI
LM6181I
Units
Typical
Limit
Typical
Limit
Typical
Limit
(Note 4)
(Note 5)
(Note 4)
(Note 5)
(Note 4)
(Note 5)
V
OS
Input Offset Voltage
1.0
2.0
1.0
2.0
1.0
3.0
mV
3.0
2.5
3.5
max
TC
V
OS
Input Offset Voltage Drift
2.5
2.5
2.5
V/C
I
B
Inverting Input
5.0
10
5.0
10
5.0
17.5
A
max
Bias Current
22
22
27.0
Non-Inverting Input
0.25
1.5
0.25
1.5
0.25
3.0
Bias Current
1.5
1.5
5.0
TC I
B
Inverting Input Bias
50
50
50
nA/C
Current Drift
Non-Inverting Input
3.0
3.0
3.0
Bias Current Drift
I
B
Inverting Input Bias Current
V
S
=
4.0V,
6.0V
0.3
0.5
0.3
0.5
0.3
1.0
A/V
max
PSR
Power Supply Rejection
0.5
0.5
1.0
Non-Inverting Input
V
S
=
4.0V,
6.0V
0.05
0.5
0.05
0.5
0.05
0.5
Bias Current
Power Supply Rejection
0.5
0.5
0.5
I
B
Inverting Input Bias Current
-2.5V
V
CM
+2.5V
0.3
0.5
0.3
0.5
0.3
1.0
CMR
Common Mode Rejection
1.0
1.0
1.5
Non-Inverting Input
-2.5V
V
CM
+2.5V
0.12
0.5
0.12
0.5
0.12
0.5
Bias Current
Common Mode Rejection
1.0
0.5
0.5
CMRR
Common Mode
-2.5V
V
CM
+2.5V
57
50
57
50
57
50
dB
min
Rejection Ratio
47
47
47
PSRR
Power Supply
V
S
=
4.0V,
6.0V
80
70
80
70
80
64
Rejection Ratio
70
70
64
R
O
Output Resistance
A
V
= -1, f = 300 kHz
0.25
0.25
0.25
R
IN
Non-Inverting
8
8
8
M
Input Resistance
min
V
O
Output Voltage Swing
R
L
= 1 k
2.6
2.25
2.6
2.25
2.6
2.25
V
min
2.2
2.25
2.25
R
L
= 100
2.2
2.0
2.2
2.0
2.2
2.0
2.0
2.0
2.0
I
SC
Output Short
100
75
100
75
100
75
mA
Circuit Current
70
70
70
min
Z
T
Transimpedance
R
L
= 1 k
1.4
0.75
1.4
0.75
1.0
0.6
0.35
0.4
0.3
M
R
L
= 100
1.0
0.5
1.0
0.5
1.0
0.4
min
0.25
0.25
0.2
I
S
Supply Current
No Load, V
O
= 0V
6.5
8.5
6.5
8.5
6.5
8.5
mA
8.5
8.5
8.5
max
V
CM
Input Common Mode
V
+
- 1.7V
V
+
- 1.7V
V
+
- 1.7V
V
Voltage Range
V
-
+ 1.7V
V
-
+ 1.7V
V
-
+ 1.7V
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4
5V AC Electrical Characteristics
The following specifications apply for Supply Voltage =
5V, R
F
= 820
, and R
L
= 1 k
unless otherwise noted. Boldface
limits apply at the temperature extremes; all other limits T
J
= 25C.
Symbol
Parameter
Conditions
LM6181AM
LM6181AI
LM6181I
Units
Typical
Limit
Typical
Limit
Typical
Limit
(Note 4)
(Note 5)
(Note 4)
(Note 5)
(Note 4)
(Note 5)
BW
Closed Loop Bandwidth -3 dB
A
V
= +2
50
50
50
MHz
min
A
V
= +10
40
40
40
A
V
= -1
55
35
55
35
55
35
A
V
= -10
35
35
35
PBW
Power Bandwidth
A
V
= -1, V
O
= 4 V
PP
40
40
40
SR
Slew Rate
A
V
= -1, V
O
=
2V,
500
375
500
375
500
375
V/s
R
L
= 150
(Note 6)
min
t
s
Settling Time (0.1%)
A
V
= -1, V
O
=
2V
50
50
50
ns
R
L
= 150
t
r
, t
f
Rise and Fall Time
V
O
= 1 V
PP
8.5
8.5
8.5
t
p
Propagation Delay Time
V
O
= 1 V
PP
8
8
8
i
n(+)
Non-Inverting Input Noise
f = 1 kHz
3
3
3
Current Density
i
n(-)
Inverting Input Noise
f = 1 kHz
16
16
16
Current Density
e
n
Input Noise Voltage
Density
f = 1 kHz
4
4
4
Second Harmonic Distortion
2 V
PP
, 10 MHz
-45
-45
-45
dBc
Third Harmonic Distortion
2 V
PP
, 10 MHz
-55
-55
-55
Differential Gain
R
L
= 150
A
V
= +2
0.063
0.063
0.063
%
NTSC
Differential Phase
R
L
= 150
A
V
= +2
0.16
0.16
0.16
Deg
NTSC
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions the device is intended to
be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see the Electrical
Characteristics.
Note 2: Human body model 100 pF and 1.5 k
.
Note 3: The typical junction-to-ambient thermal resistance of the molded plastic DIP(N) package soldered directly into a PC board is 102C/W. The
junction-to-ambient thermal resistance of the S.O. surface mount (M) package mounted flush to the PC board is 70C/W when pins 1, 4, 8, 9 and 16 are soldered
to a total 2 in
2
1 oz. copper trace. The 16-pin S.O. (M) package must have pin 4 and at least one of pins 1, 8, 9, or 16 connected to V
-
for proper operation. The typical
junction-to-ambient thermal resistance of the S.O. (M-8) package soldered directly into a PC board is 153C/W.
Note 4: Typical values represent the most likely parametric norm.
Note 5: All limits guaranteed at room temperature (standard type face) or at operating temperature extremes (bold face type).
Note 6: Measured from +25% to +75% of output waveform.
Note 7: Continuous short circuit operation at elevated ambient temperature can result in exceeding the maximum allowed junction temperature of 150C. Output cur-
rents in excess of
130 mA over a long term basis may adversely affect reliability.
Note 8: For guaranteed Military Temperature Range parameters see RETS6181X.
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5
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