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LM6181 100 mA, 100 MHz Current Feedback Amplifier
May 1998
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 50Ω or 75Ω
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
™
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/µs, 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/µs
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 100Ω
n
Guaranteed bandwidth and slew rate
n
Improved performance over EL2020, OP160, AD844,
LT1223 and HA5004
Applications
n
n
n
n
n
Coax cable driver
Video amplifier
Flash ADC buffer
High frequency filter
Scanner and Imaging systems
Typical Application
DS011328-1
Cable Driver
DS011328-2
VIP
™
is a registered trademark of National Semiconductor Corporation.
© 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
Differential Input Voltage
Input Voltage
Inverting Input Current
Soldering Information
Dual-In-Line Package (N)
Soldering (10 sec)
Small Outline Package (M)
Vapor Phase (60 seconds)
Infrared (15 seconds)
Output Short Circuit
Storage Temperature Range
Maximum Junction Temperature
ESD Rating (Note 2)
−65˚C
≤
T
J
≤
+150˚C
150˚C
±
3000V
±
18V
±
6V
±
Supply Voltage
15 mA
Operating Ratings
Supply Voltage Range
7V to 32V
Junction Temperature Range (Note 3)
LM6181AM
−55˚C
≤
T
J
≤
+125˚C
LM6181AI, LM6181I
−40˚C
≤
T
J
≤
+85˚C
Thermal Resistance (θ
JA
,
θ
JC
)
8-pin DIP (N)
102˚C/W, 42˚C/W
8-pin SO (M-8)
153˚C/W, 42˚C/W
16-pin SO (M)
70˚C/W, 38˚C/W
260˚C
215˚C
220˚C
(Note 7)
±
15V DC Electrical Characteristics
The following specifications apply for Supply Voltage =
±
15V, R
F
= 820Ω, and R
L
= 1 kΩ unless otherwise noted.
Boldface
limits apply at the temperature extremes; all other limits T
J
= 25˚C.
Symbol
Parameter
Conditions
LM6181AM
Typical
(Note 4)
V
OS
TC
V
OS
I
B
Input Offset Voltage
Input Offset Voltage Drift
Inverting Input Bias Current
Non-Inverting Input Bias Current
TC I
B
Inverting Input Bias Current Drift
Non-Inverting Input Bias
Current Drift
I
B
PSR
Inverting Input Bias Current
Power Supply Rejection
Non-Inverting Input Bias Current
Power Supply Rejection
I
B
CMR
Inverting Input Bias Current
Common Mode Rejection
Non-Inverting Input Bias Current
Common Mode Rejection
CMRR
PSRR
R
O
R
IN
V
O
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Resistance
Non-Inverting Input Resistance
Output Voltage Swing
R
L
= 1 kΩ
R
L
= 100Ω
I
SC
Output Short Circuit Current
−10V
≤
V
CM
≤
+10V
V
S
=
±
4.5V,
±
16V
A
V
= −1, f = 300 kHz
60
80
0.2
10
12
11
130
11
11
10
7.5
100
75
130
11
−10V
≤
V
CM
≤
+10V
0.1
−10V
≤
V
CM
≤
+10V
0.3
V
S
=
±
4.5V,
±
16V
0.05
V
S
=
±
4.5V,
±
16V
0.3
0.5
3.0
0.5
1.5
0.5
0.75
0.5
0.5
50
50
70
70
0.2
10
12
11
11
10
8.0
100
85
130
11
80
60
0.1
0.3
0.05
0.3
0.5
3.0
0.5
1.5
0.5
0.75
0.5
0.5
50
50
70
70
0.2
10
12
11
11
10
8.0
100
85
mA
min
80
60
0.1
0.3
0.05
0.3
0.75
4.5
0.5
3.0
0.75
1.0
0.5
0.5
50
50
70
65
dB
min
dB
min
Ω
MΩ
min
V
min
µA/V
max
2.0
5.0
2.0
0.5
30
10
5.0
12.0
1.5
3.0
30
10
0.5
Limit
(Note 5)
3.0
4.0
5.0
2.0
5.0
12.0
1.5
3.0
30
10
2.0
LM6181AI
Typical
(Note 4)
2.0
Limit
(Note 5)
3.0
3.5
5.0
5.0
10
17.0
3.0
5.0
nA/˚C
LM6181I
Typical
(Note 4)
3.5
Limit
(Note 5)
5.0
5.5
mV
max
µV/˚C
µA
max
Units
www.national.com
2
±
15V DC Electrical Characteristics
Symbol
Parameter
Conditions
(Continued)
The following specifications apply for Supply Voltage =
±
15V, R
F
= 820Ω, and R
L
= 1 kΩ unless otherwise noted.
Boldface
limits apply at the temperature extremes; all other limits T
J
= 25˚C.
LM6181AM
Typical
(Note 4)
Z
T
Transimpedance
R
L
= 1 kΩ
R
L
= 100Ω
I
S
V
CM
Supply Current
Input Common Mode
Voltage Range
No Load, V
O
= 0V
1.8
1.4
7.5
V
+
− 1.7V
V + 1.7V
−
LM6181AI
Typical
(Note 4)
1.8
1.4
7.5
V
+
− 1.7V
V + 1.7V
−
LM6181I
Typical
(Note 4)
1.8
1.4
7.5
V
+
− 1.7V
V + 1.7V
−
Units
Limit
(Note 5)
1.0
0.5
0.8
0.4
10
10
Limit
(Note 5)
1.0
0.5
0.8
0.4
10
10
Limit
(Note 5)
0.8
0.4
0.7
0.35
10
10
mA
max
V
MΩ
min
±
15V AC Electrical Characteristics
The following specifications apply for Supply Voltage =
±
15V, R
F
= 820Ω, R
L
= 1 kΩ unless otherwise noted.
Boldface
limits
apply at the temperature extremes; all other limits T
J
= 25˚C.
Symbol
Parameter
Conditions
LM6181AM
Typical
(Note 4)
BW
Closed Loop Bandwidth
−3 dB
A
V
= +2
A
V
= +10
A
V
= −1
A
V
= −10
PBW
SR
Power Bandwidth
Slew Rate
A
V
= −1, V
O
= 5 V
PP
Overdriven
A
V
= −1, V
O
=
±
10V,
R
L
= 150Ω (Note 6)
t
s
t
r
, t
f
t
p
i
n(+)
i
n(−)
e
n
Settling Time (0.1%)
Rise and Fall Time
Propagation Delay Time
Non-Inverting Input Noise
Current Density
Inverting Input Noise
Current Density
Input Noise Voltage
Density
Second Harmonic Distortion
Third Harmonic Distortion
Differential Gain
f = 1 kHz
2 V
PP
, 10 MHz
2 V
PP
, 10 MHz
R
L
= 150Ω
A
V
= +2
NTSC
Differential Phase
R
L
= 150Ω
A
V
= +2
NTSC
0.04
0.04
0.04
Deg
0.05
0.05
0.05
%
4
−50
−55
4
−50
−55
4
−50
−50
dBc
f = 1 kHz
16
16
16
A
V
= −1, V
O
=
±
5V
R
L
= 150Ω
V
O
= 1 V
PP
V
O
= 1 V
PP
f = 1 kHz
5
6
3
5
6
3
5
6
3
50
50
50
ns
100
80
100
60
60
2000
1400
1000
80
Limit
(Note 5)
LM6181AI
Typical
(Note 4)
100
80
100
60
60
2000
1400
1000
80
Limit
(Note 5)
LM6181I
Typical
(Note 4)
100
80
100
60
60
2000
1400
1000
V/µs
min
80
Limit
(Note 5)
MHz
min
Units
3
www.national.com
±
5V DC Electrical Characteristics
The following specifications apply for Supply Voltage =
±
5V, R
F
= 820Ω, and R
L
= 1 kΩ unless otherwise noted.
Boldface
limits apply at the temperature extremes; all other limits T
J
= 25˚C.
Symbol
Parameter
Conditions
LM6181AM
Typical
(Note 4)
V
OS
TC
V
OS
I
B
Input Offset Voltage
Input Offset Voltage Drift
Inverting Input
Bias Current
Non-Inverting Input
Bias Current
TC I
B
Inverting Input Bias
Current Drift
Non-Inverting Input
Bias Current Drift
I
B
PSR
Inverting Input Bias Current
Power Supply Rejection
Non-Inverting Input
Bias Current
Power Supply Rejection
I
B
CMR
Inverting Input Bias Current
Common Mode Rejection
Non-Inverting Input
Bias Current
Common Mode Rejection
CMRR
PSRR
R
O
R
IN
V
O
Common Mode
Rejection Ratio
Power Supply
Rejection Ratio
Output Resistance
Non-Inverting
Input Resistance
Output Voltage Swing
R
L
= 1 kΩ
R
L
= 100Ω
I
SC
Z
T
Output Short
Circuit Current
Transimpedance
R
L
= 1 kΩ
R
L
= 100Ω
I
S
V
CM
Supply Current
Input Common Mode
Voltage Range
No Load, V
O
= 0V
1.4
1.0
6.5
V
+
− 1.7V
V + 1.7V
−
LM6181AI
Typical
(Note 4)
1.0
2.5
Limit
(Note 5)
2.0
2.5
LM6181I
Typical
(Note 4)
1.0
2.5
Limit
(Note 5)
3.0
3.5
Units
Limit
(Note 5)
2.0
3.0
1.0
2.5
5.0
0.25
50
3.0
V
S
=
±
4.0V,
±
6.0V
V
S
=
±
4.0V,
±
6.0V
0.3
0.05
mV
max
µV/˚C
10
22
1.5
1.5
5.0
0.25
50
3.0
10
22
1.5
1.5
5.0
0.25
50
3.0
17.5
27.0
3.0
5.0
µA
max
nA/˚C
0.5
0.5
0.5
0.5
0.3
0.05
0.5
0.5
0.5
0.5
0.3
0.05
1.0
1.0
0.5
0.5
µA/V
max
−2.5V
≤
V
CM
≤
+2.5V
−2.5V
≤
V
CM
≤
+2.5V
0.3
0.12
0.5
1.0
0.5
1.0
0.3
0.12
0.5
1.0
0.5
0.5
0.3
0.12
1.0
1.5
0.5
0.5
−2.5V
≤
V
CM
≤
+2.5V
V
S
=
±
4.0V,
±
6.0V
A
V
= −1, f = 300 kHz
57
80
0.25
8
2.6
2.2
100
50
47
70
70
57
80
0.25
8
50
47
70
70
57
80
0.25
8
50
47
64
64
dB
min
Ω
MΩ
min
2.25
2.25
2.0
2.0
75
70
0.6
0.3
MΩ
min
mA
max
V
0.4
0.2
8.5
8.5
mA
min
V
min
2.25
2.2
2.0
2.0
75
70
0.75
0.35
0.5
0.25
8.5
8.5
2.6
2.2
100
1.4
1.0
6.5
V
+
− 1.7V
V + 1.7V
−
2.25
2.25
2.0
2.0
75
70
0.75
0.4
0.5
0.25
8.5
8.5
2.6
2.2
100
1.0
1.0
6.5
V
+
− 1.7V
V
−
+ 1.7V
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