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LM7171 Very High Speed, High Output Current, Voltage Feedback Amplifier
May 2006
LM7171
Very High Speed, High Output Current, Voltage
Feedback Amplifier
General Description
The LM7171 is a high speed voltage feedback amplifier that
has the slewing characteristic of a current feedback ampli-
fier; yet it can be used in all traditional voltage feedback
amplifier configurations. The LM7171 is stable for gains as
low as +2 or −1. It provides a very high slew rate at 4100V/µs
and a wide unity-gain bandwidth of 200 MHz while consum-
ing only 6.5 mA of supply current. It is ideal for video and
high speed signal processing applications such as HDSL
and pulse amplifiers. With 100 mA output current, the
LM7171 can be used for video distribution, as a transformer
driver or as a laser diode driver.
Operation on
±
15V power supplies allows for large signal
swings and provides greater dynamic range and signal-to-
noise ratio. The LM7171 offers low SFDR and THD, ideal for
ADC/DAC systems. In addition, the LM7171 is specified for
±
5V operation for portable applications.
The LM7171 is built on National’s advanced VIP
™
III (Verti-
cally integrated PNP) complementary bipolar process.
Features
(Typical Unless Otherwise Noted)
n
Easy-to-use voltage feedback topology
n
Very high slew rate: 4100 V/µs
n
Wide unity-gain bandwidth: 200 MHz
n
−3 dB frequency
@
A
V
= +2: 220 MHz
n
Low supply current: 6.5 mA
n
High open loop gain: 85 dB
n
High output current: 100 mA
n
Differential gain and phase: 0.01%, 0.02˚
n
Specified for
±
15V and
±
5V operation
Applications
n
n
n
n
n
n
n
n
HDSL and ADSL drivers
Multimedia broadcast systems
Professional video cameras
Video amplifiers
Copiers/scanners/fax
HDTV amplifiers
Pulse amplifiers and peak detectors
CATV/fiber optics signal processing
Typical Performance
Large Signal Pulse Response
A
V
= +2, V
S
=
±
15V
01238501
VIP
™
is a trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation
DS012385
www.national.com
LM7171
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Tolerance (Note 2)
Supply Voltage (V
+
–V
−
)
Differential Input Voltage (Note 11)
Output Short Circuit to Ground
(Note 3)
Storage Temperature Range
Continuous
−65˚C to +150˚C
2.5 kV
36V
Maximum Junction Temperature
(Note 4)
150˚C
Operating Ratings
(Note 1)
Supply Voltage
Junction Temperature Range
LM7171AI, LM7171BI
Thermal Resistance (θ
JA
)
8-Pin MDIP
8-Pin SOIC
108˚C/W
172˚C/W
−40˚C
≤
T
J
≤
+85˚C
5.5V
≤
V
S
≤
36V
±
10V
±
15V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= +15V, V
−
= −15V, V
CM
= 0V, and R
L
= 1 kΩ.
Boldface
limits apply at the temperature extremes
Symbol
Parameter
Conditions
Typ
(Note 5)
0.2
35
2.7
0.1
Common Mode
Differential Mode
R
O
CMRR
PSRR
V
CM
A
V
Open Loop Output
Resistance
Common Mode
Rejection Ratio
Power Supply
Rejection Ratio
Input Common-Mode
Voltage Range
Large Signal Voltage
Gain (Note 7)
R
L
= 100Ω
V
O
Output Swing
R
L
= 1 kΩ
81
13.3
−13.2
R
L
= 100Ω
11.8
−10.5
Output Current
(Open Loop)
(Note 8)
Sinking, R
L
= 100Ω
105
Sourcing, R
L
= 100Ω
118
R
L
= 1 kΩ
85
80
75
75
70
13
12.7
−13
−12.7
10.5
9.5
−9.5
−9
105
95
95
90
75
70
70
66
13
12.7
−13
−12.7
10.5
9.5
−9.5
−9
105
95
95
90
dB
min
dB
min
V
min
V
max
V
min
V
max
mA
min
mA
max
CMRR
>
60 dB
V
S
=
±
15V to
±
5V
90
V
CM
=
±
10V
105
85
80
85
80
75
70
75
70
dB
min
dB
min
V
40
3.3
15
Ω
10
12
I
OS
R
IN
Input Offset Current
Input Resistance
4
6
10
12
4
6
LM7171AI
Limit
(Note 6)
V
OS
TC V
OS
I
B
Input Offset Voltage
Input Offset Voltage
Average Drift
Input Bias Current
µA
max
µA
max
MΩ
1
4
LM7171BI
Limit
(Note 6)
3
7
mV
max
µV/˚C
Units
±
13.35
www.national.com
2
LM7171
±
15V DC Electrical Characteristics
Symbol
Parameter
(Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= +15V, V
−
= −15V, V
CM
= 0V, and R
L
= 1 kΩ.
Boldface
limits apply at the temperature extremes
Conditions
Typ
(Note 5)
100
100
140
135
6.5
8.5
9.5
8.5
9.5
mA
max
mA
LM7171AI
Limit
(Note 6)
Output Current
(in Linear Region)
Sourcing, R
L
= 100Ω
Sinking, R
L
= 100Ω
Sourcing
Sinking
LM7171BI
Limit
(Note 6)
mA
Units
I
SC
I
S
Output Short Circuit
Current
Supply Current
±
15V AC Electrical Characteristics
Unless otherwise specified, T
J
= 25˚C, V
+
= +15V, V
−
= −15V, V
CM
= 0V, and R
L
= 1 kΩ.
Typ
Symbol
SR
Parameter
Slew Rate (Note 9)
Unity-Gain Bandwidth
−3 dB Frequency
φ
m
t
s
t
p
A
D
φ
D
Phase Margin
Settling Time (0.1%)
Propagation Delay
Differential Gain (Note 10)
Differential Phase (Note 10)
Second Harmonic (Note 12)
Third Harmonic (Note 12)
e
n
Input-Referred
Voltage Noise
i
n
Input-Referred
Current Noise
f = 10 kHz
1.5
f
IN
= 10 kHz
f
IN
= 5 MHz
f
IN
= 10 kHz
f
IN
= 5 MHz
f = 10 kHz
A
V
= −1, V
O
=
±
5V
R
L
= 500Ω
A
V
= −2, V
IN
=
±
5V,
R
L
= 500Ω
0.01
0.02
−110
−75
−115
−55
14
%
Deg
dBc
dBc
dBc
dBc
5
ns
A
V
= +2
Conditions
A
V
= +2, V
IN
= 13 V
PP
A
V
= +2, V
IN
= 10 V
PP
(Note 5)
4100
3100
200
220
50
42
MHz
MHz
Deg
ns
LM7171AI
Limit
(Note 6)
LM7171BI
Limit
(Note 6)
V/µs
Units
±
5V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= +5V, V
−
= −5V, V
CM
= 0V, and R
L
= 1 kΩ.
Boldface
limits
apply at the temperature extremes
Typ
Symbol
V
OS
TC V
OS
I
B
I
OS
Parameter
Input Offset Voltage
Input Offset Voltage
Average Drift
Input Bias Current
Input Offset Current
3
LM7171AI
Limit
(Note 6)
1.5
4
LM7171BI
Limit
(Note 6)
3.5
7
mV
max
µV/˚C
Units
Conditions
(Note 5)
0.3
35
3.3
0.1
10
12
4
10
12
4
µA
max
µA
www.national.com
LM7171
±
5V DC Electrical Characteristics
(Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
+
= +5V, V
−
= −5V, V
CM
= 0V, and R
L
= 1 kΩ.
Boldface
limits
apply at the temperature extremes
Typ
Symbol
Parameter
Conditions
(Note 5)
LM7171AI
Limit
(Note 6)
6
LM7171BI
Limit
(Note 6)
6
max
MΩ
Ω
80
75
V
S
=
±
15V to
±
5V
CMRR
>
60 dB
R
L
= 1 kΩ
R
L
= 100Ω
90
85
80
70
65
75
70
dB
min
dB
min
V
75
70
76
3.4
−3.4
R
L
= 100Ω
3.1
−3.0
Output Current
(Open Loop) (Note 8)
Sinking, R
L
= 100Ω
30
135
100
6.2
8
9
8
9
mA
max
Sourcing, R
L
= 100Ω
31
72
67
3.2
3
−3.2
−3
2.9
2.8
−2.9
−2.8
29
28
29
28
70
65
68
63
3.2
3
−3.2
−3
2.9
2.8
−2.9
−2.8
29
28
29
28
dB
min
dB
min
V
min
V
max
V
min
V
max
mA
min
mA
max
mA
Units
R
IN
R
O
CMRR
PSRR
V
CM
A
V
Input Resistance
Output Resistance
Common Mode
Rejection Ratio
Power Supply
Rejection Ratio
Input Common-Mode
Voltage Range
Large Signal Voltage
Gain (Note 7)
Common Mode
Differential Mode
V
CM
=
±
2.5V
40
3.3
15
104
±
3.2
78
V
O
Output Swing
R
L
= 1 kΩ
I
SC
I
S
Output Short Circuit
Current
Supply Current
Sourcing
Sinking
±
5V AC Electrical Characteristics
Unless otherwise specified, T
J
= 25˚C, V
+
= +5V, V
−
= −5V, V
CM
= 0V, and R
L
= 1 kΩ.
Typ
Symbol
SR
Parameter
Slew Rate (Note 9)
Unity-Gain Bandwidth
−3 dB Frequency
φ
m
t
s
t
p
A
D
φ
D
Phase Margin
Settling Time (0.1%)
Propagation Delay
Differential Gain (Note 1)
Differential Phase (Note 10)
4
LM7171AI
Limit
(Note 6)
LM7171BI
Limit
(Note 6)
V/µs
MHz
MHz
Deg
ns
ns
%
Deg
Units
Conditions
A
V
= +2, V
IN
= 3.5 V
PP
A
V
= +2
A
V
= −1, V
O
=
±
1V,
R
L
= 500Ω
A
V
= −2, V
IN
=
±
1V,
R
L
= 500Ω
(Note 5)
950
125
140
57
56
6
0.02
0.03
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51mcu
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