TI1 LM6311 Low noise high speed voltage feedback operational amplifier Datasheet

LM6311
LM6311 Low Noise High Speed Voltage Feedback Operational Amplifier
Literature Number: SNOS790A
LM6311
Low Noise High Speed Voltage
Feedback Operational Amplifier
General Description
Features
The LM6311 is a low noise voltage feedback operational
amplifier with low distortion. This makes the LM6311 ideal
for signal recovery, high quality video, audio and medical
imaging.
The conventional voltage fedback design makes it easy to
use in standard active filter circuits.
The low distortion makes the LM6311 a good choice for
driving high resolution analog-to-digital converters.
The 50 mA current drive and good capacitive load tolerance
make the LM6311 useful for driving analog-to-digital converters which have switched-capacitor type inputs.
The LM6311 provides low noise and high speed for a 5V
single supply designs, making it useful for desktop systems
and portable designs.
Y
Y
Y
Y
Y
Y
Y
Y
Applications
High end consumer audio
Professional video
Medical imaging
Instrumentation
Differential amplifiers and active filters
Telecommunications signal recovery
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Y
Y
Y
Y
Y
Y
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Connection Diagrams
110 MHz b3 dB bandwidth
2.3 nV/root-Hertz voltage noise
3.5 pA/root-Hertz current noise
50 mA output current
200V/ms slew rate
Low distortion b60 dB @ 5 MHz
Pin for external compensation
Dual g 5V or single a 5V or a 12V supplies
Guaranteed specs at a 5V
e
Y
LM6311 Input Referred
Voltage Noise V a e a 5V
8-Pin DIP/SO-8
TL/H/12546 – 1
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Top View
Package
Ordering
Information
TL/H/12546 – 16
NSC Drawing
Number
Package
Marking
Transport Media
8-Pin DIP
LM6311IN
N08E
LM6311IN
Rails
8-Pin SO-8
LM6311IM
M08A
LM6311IM
Rails
8-Pin SO-8
LM6311IMX
M08A
LM6311IM
2.5k Units Tape and Reel
TinyPaKTM is a trademark of National Semiconductor Corporation.
C1996 National Semiconductor Corporation
TL/H/12546
RRD-B30M76/Printed in U. S. A.
http://www.national.com
LM6311 Low Noise High Speed Voltage
Feedback Operational Amplifier
November 1995
Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage
Junction Temperature Range
LM6311I
ESD Tolerance (Note 2)
Differential Input Voltage
Thermal resistance (iJA)
N Package, 8-pin Molded DIP
SO-8 Package, 8 Pin Surface Mount
Voltage at Input/Output Pin
Supply Voltage (V a – Vb)
Current at Input Pin
Current at Output Pin (Note 3)
Current at Power Supply Pin
Lead Temperature (soldering, 10 sec)
Storage Temp. Range
2000V
g 10V
(V a ), (Vb)
12V
g 5 mA
g 80 mA
80 mA
260§ C
g 2.25V to g 6V
b 40§ C s TJ s a 85§ C
125§ C/W
165§ C/W
b 65§ C to a 150§ C
Junction Temperature (Note 4)
150§ C
g 5V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ e 25§ C, V a
e 5V, V b e b 5V, VCM e VO e 0V and RL e % . Boldface limits apply at the temperature extreme S.
Input Offset Voltage
TCVOS
Input Offset Voltage
Average Drift
IB
Input Bias Current
TCIB
Input Bias Current
Average Drift
Ioffset
TCIoffset
CMRR
CMVR
a PSRR
0.5
LM6311I
Limit
(Note 6)
Units
2.5
4.0
mV
max
5
8
mV/§ C
30
75
0.3
Input Offset Current
0.5
Input Offset Current
Average Drift
VCM e g 2.5V
Common Mode
Voltage Range
CMRR e 60 db
Positive Power
Supply Rejection
Ratio
Negative Power
Supply Rejection
Ratio
mA
max
mA/§ C
5
14
0.02
Common Mode
Rejection Ratio
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b PSRR
Typ
(Note 5)
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VOS
Conditions
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Parameter
et
Symbol
mA
max
mA/§ C
90
60
54
db
min
g 3.5
g 3.2
V
V a e 4.5V to 5V
Vb e b5.0V
75
62
55
db
min
V a e 5.0V
Vb e b4.5V to b5.0V
75
62
55
db
min
CIN-CM
Common-Mode
Input Capacitance
2.5
pF
CIN-DIFF
Differential-Mode
Input Capacitance
2.5
pF
AVOL
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Voltage Gain
VO e b2V to a 2V
RL e 1 kX
2
70
62
55
db
5V DC Electrical Characteristics
g
Unless otherwise specified, all limits guaranteed for TJ e 25§ C, V a
e 5V, V b e b 5V, VCM e VO e 0V and RL e % . Boldface limits apply at the temperature extremes. (Continued)
Symbol
VO
Parameter
Output Swing
Conditions
RL e 100X
RL e 1 kX
Typ
(Note 5)
LM6311I
Limit
(Note 6)
Units
3.4
3.1
1.2
V
min
b 3.4
b 3.1
b 1.2
V
max
3.5
b 2.5
V
min
b 3.5
b 2.5
V
max
3.9
b 3.9
Output Resistance
IS
Supply Current
Closed Loop
X
max
0.1
16
17
14
g 5V AC Electrical Characteristics
mA
max
e
ROUT
Unless otherwise specified, all limits guaranteed for TJ e 25§ C, V a
Symbol
Parameter
et
e 5V, V b e b 5V, VCM e VO e 0V and RL e 100X. Boldface limits apply at the temperature extremes.
Conditions
Typ
(Note 5)
LM6311I
Limit
(Note 6)
Units
Slew Rate
AV e a 2, 2V Output Pulse
200
V/ms
b 3 dB BW
b 3db Bandwidth
AV e a 1
110
MHz
b 3 db BW
b 3 dB Bandwidth
AV e a 2
40
MHz
Dg
Dp
en
Differential Gain
(Note 7)
AV e a 2, 150X Load
0.12
%
Differential Phase
(Note 7)
AV e a 2, 150X Load
0.35
Deg
Input-Referred
Voltage Noise
1 MHz k f k 100 MHz
Input-Referred
Current Noise
1 MHz k f k 100 MHz
2.3
3.5
nV
0Hz
nV
0Hz
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in
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SR
3
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5V DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ e 25§ C, V a
e 5V, V b e 0V, VCM e 2.5V, VO e 2.5V and RL e % . Boldface limits apply at the temperature extremes.
Parameter
Conditions
VOS
Input Offset Voltage
TCVOS
Input Offset Voltage
Average Drift
IB
Input Bias Current
TCIB
Input Bias Current
Average Drift
Ioffset
Input Offset Current
TCIoffset
Input Offset Current
Average Drift
CMRR
Common Mode
Rejection Ratio
VCM e 1.75 to 3.25
a PSRR
Positive Power Supply
Rejection Ratio
V a e 4.75V to 6V
CIN-CM
Common-Mode
Input Capacitance
CIN-DIFF
Differential-Mode
Input Capacitance
VO
Output Swing
Units
0.3
3.0
5.0
mV
max
6
mV/§ C
16
30
0.3
0.6
6
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mA
max
mA/§ C
65
50
db
min
70
60
50
db
min
et
90
RL e 100X to 2.5V
2.5
pF
2.5
pF
4.2
3.6
3.4
V
min
0.9
1.4
1.6
V
max
4.3
3.8
3.6
V
min
0.70
1.2
1.4
V
max
67
55
50
db
11
13
14
mA
max
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Voltage Gain
mA
max
mA/§ C
0.02
VO e 2.0V to 3.0V
RL e 1 kX to 2.5V
Supply Current
O
IS
LM6311I
Limit
(Note 6)
5
RL e 1 kX to 2.5V
AVOL
Typ
(Note 5)
e
Symbol
4
5V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ e 25§ C, V a
e 5V, V b e 0V, VCM e 2.5V, VO e 2.5V and RL e 100X to 2.5V. Boldface limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LM6311I
Limit
(Note 6)
Units
SR
Slew Rate
AV e a 2, 0.5V Output Pulse
100
V/ms
b 3dB BW
b 3dB Bandwidth
AV e a 2
40
MHz
Note 1: Absolute maximum Ratings indicate limits beyond which damage to the device my occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical characteristics.
Note 2: Human body model, 1.5 kX in series with 100 pF.
Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the
maximum allowed junction temperature of 150§ C.
Note 4: The maximum power dissipation is a function of TJ(max) iJA and TA. The maximum allowable power dissipation at any ambient temperature is
PD e (TJ(max) –TA)/iJA. All numbers apply for packages soldered directly into a PC board.
Note 5: Typical values represent the most likely parametric norm.
Note 6: All limits are guaranteed by testing or statistical analysis.
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Note 7: Differential Gain and Phase performace are sensitive to layout. Follow layout suggestions in text for best results.
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Typical Performance Curves TA e 25§ C, V a e a 5V, Vb e b5V, RF e 100X, RL e 100X unless noted
g 5V CURVES
AV e a 1 Gain and Phase vs Frequency
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AV e a 2 Gain and Phase vs Frequency
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TL/H/12546 – 3
TL/H/12546 – 4
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AV e b1 Gain and Phase vs Frequency
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TL/H/12546 – 5
6
Typical Performance Curves
TA e 25§ C, V a e a 5V, Vb e b5V, RF e 100X, RL e 100X unless noted (Continued)
g 5V CURVES (Continued)
AV e a 2 Reference to
Ground Pulse Response
AV e a 2 Pulse Response
TL/H/12546 – 7
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TL/H/12546 – 6
AV e b1 Large Signal
Pulse Response
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AV e b1 Small Signal
Pulse Response
TL/H/12546 – 9
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TL/H/12546 – 8
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Typical Performance Curves
TA e 25§ C, V a e a 5V, Vb e 0V, RF e 100X, RL e 100X to 2.5V unless noted (Continued)
5V CURVES
AV e a 1 Gain and Phase vs Frequency
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et
AV e a 2 Gain and Phase vs Frequency
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TL/H/12546 – 10
TL/H/12546 – 11
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AV e b1 Gain and Phase vs Frequency
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TL/H/12546 – 12
8
Typical Performance Curves
TA e 25§ C, V a e a 5V, Vb e 0V, RF e 100X, RL e 100X to 2.5V unless noted (Continued)
5V CURVES (Continued)
AV e b1 Large Signal
Pulse Response
AV e a 2 Pulse Response
TL/H/12546 – 14
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TL/H/12546 – 13
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AV e b1 Small Signal
Pulse Response
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TL/H/12546 – 15
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Typical Performance Curves (Continued)
Bandwidth vs Supply Voltage, 27 pF External Capacitor (25§ C)
TL/H/12546 – 17
FIGURE 1
Non Inverting Amplifier
Center-referenced Input
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Inverting Amplifier
Center-referenced Input
TL/H/12546 – 19
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FIGURE 2
Center-referenced Output
Ground-referenced Output
TL/H/12546–20
TL/H/12546 – 21
FIGURE 3
LM6311 Maximum
Undistorted Output Swing.
Loads Tied to Ground. V a e 5V.
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Exceeding the Output Range,
a 5V Supply No Load
TL/H/12546–22
TL/H/12546 – 23
FIGURE 4
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FIGURE 5
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Application Information
pins as possible. It is generally advisable to use two capacitors at each supply voltage pin. A small surface mount capacitor with a value of around 0.01 mF (10 nF), usually a
ceramic type with good RF performance, should be placed
closest to the pin. A larger capacitor, usually in the range of
1.0 mF to 4.7 mF, should also be placed near the pin. The
larger capacitor should be a device with good RF characteristics and low ESR (equivalent series resistance) for best
results. Ceramic and tantalum capacitors generally work
well as the larger capacitor.
It is very important to reduce capacitance at the input and
output pins. The ground plane and any other planes (power,
etc.) should be ‘‘opened up’’ or removed near the pins. The
opening should extend to the middle of the nearest pins as
a minimum.
The LM6311 is built on a high performance bipolar process.
The transistors used in this process have bandwidths much
higher than the LM6311 itself. These transistors have a potential to oscillate or ring at 400 MHz to 1 GHz when used in
layouts where the components are more than (/4 inch 6 mm)
away from the op amp pins. These oscillations may produce
apparent shifts in voltage offset or excess current consumption.
To avoid this, keep the input and output resistors as close
as possible to their respective pins. Spacing within (/8×
(3 mm) or less is recommended for best results.
For best performance, low inductance resistors, such as
chip resistors, are recommended. The use of wirewound resistors is strongly not recommended.
DIP devices should use socket pins which are flush with the
board. Conventional sockets have additional capacitance
and are not recommended. Obviously, the use of wirewrapped sockets or the ‘‘white plastic’’ push in prototype
boards is strongly not recommended.
GENERAL INFORMATION
The LM6311 is a high speed complementary bipolar amplifier with good video performance. The LM6311 can operate
on g 2.5V supplies, or from a a 5V single supply.
The LM6311 is available in two package types: DIPs for
through hole designs, and SO-8 surface mount packages.
Benefits of the LM6311
LOW NOISE
The low noise performance of the LM6311 (typically 2.3 nV
per root-hertz) makes the LM6311 a good choice for signal
recovery, high gain amplifiers other low noise designs.
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BALANCED DIFFERENTIAL INPUTS
The relatively low offset currents and low offset voltage of
the LM6311 make it easy to design differential signal recovery circuits. The low offset currents and voltage feedback
design make it easy to use the LM6311 in conventional active filter designs.
Using the LM6311
LIMITS AND PRECAUTIONS
et
a 5V SINGLE SUPPLY OPERATION
Single supply operation can avoid the cost of split power
supplies, and make it easier to use the LM6311 in single
supply digital systems. The LM6311 provides high bandwidth for a 5V single supply operation. See Figure 1 .
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Supply Voltage
The absolute maximum supply voltage which may be applied to the LM6311 is 12V. Designers should not design for
more than 10V nominal, and carefully check supply tolerances under all conditions so that the voltages do not exceed the maximum.
Notes for a 5V Single Supply
Operation
Differential Input Voltage
Differential input voltage is the difference in voltage between the non-inverting ( a ) input and the inverting input
(b) of the op amp. The absolute maximum differential input
voltage is g 10V across the inputs. This limit also applies
when there is no power supplied to the op amp.
Very fast input pulses into high gain circuits may cause the
output to saturate, leading to an overload recovery time in
the millisecond range. This requires inputs which are faster
than those usually used in video systems and gain levels
which will push the output of the amplifier toward the limit of
its output swing.
The LM6311 provides good high speed performance at
a 5V, however, certain limitations should be observed in applying the LM6311.
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INPUT VOLTAGE RANGE
Input voltage should be near the center of the V a and Vb
supplies. For 5V and ground, the inputs should be between
1.75V and 3.25V. Inputs beyond this range will limit the output swing, reduce the common mode rejection and power
supply rejection, lower the bandwidth, and tend to greatly
increase distortion.
For a 5V designs, using a reference voltage near a 2.5V is
recommended. See Figure 2 .
Layout and Power Supply Bypassing
Since the LM6311 is a high speed (over 50 MHz) device,
good high speed circuit layout practices should be followed.
This should include the use of ground planes, adequate
power supply bypassing, removing metal from around the
input pins to reduce capacitance, and careful routing of the
output signal lines to keep them away from the input pins.
The power supply pins should be bypassed on both the negative and positive supply inputs with capacitors placed close
to the pins. Surface mount capacitors should be used for
best performance, and should be placed as close to the
OUTPUT VOLTAGE SWING
Output voltage swing will depend on the load and on what
voltage (ground or 2.5V) is on the other side of the load. At
room temperature (25§ C) and a 5V supply with a 1 kX load
tied to 2.5V, the LM6311 will swing from 1.0V to 4.0V.
For a ground referenced load, this output range will shift
about 400 mV – 500 mV towards ground. See Figure 3 for
schematics of loads referenced to the center and to ground.
11
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Application Information (Continued)
to terminate cables and long circuit traces with their characteristic impedance to reduce reflected signals.
Reflections should not be confused with overshoot. Reflections will depend on cable length, while overshoot will depend on load and feedback resistance and capacitance.
When determining the type of problem, often removing or
drastically shortening the cable will reduce or eliminate reflections. Overshoot can exist without a cable attached to
the op amp output.
If the load is too heavy (too low a resistance) for the output
swing, or the output tries to go too close to either V a or Vb
power supply rail, the output will ‘‘foldback’’ as shown in
Figure 4 . This will distort the output signal. This should be
avoided. There are many ways to avoid this, such as limiting
the input signal, lowering the gain of the amplifier, or using a
lighter (higher resistance) load.
For designs which require low distortion, it is recommended
to keep the output of the amplifier more than 300 mV away
from the levels where visible distortion can be seen on an
oscilloscope. For designs with wide temperature ranges
which have low distortion requirements, additional margin
may be required, which should be determined expermentally. See Figure 5 . Figure 5 was recorded when visible distortion was just visible.
Other High Speed and Video Amplifiers
National Semiconductor has an extensive line of high speed
amplifiers, with a range of operating voltage from 3V single
supply to g 15V, and a range of package types, such as the
space saving SOT23-5 TinyPaKTM (3.05 mm x 3.00 mm x
1.43 mmÐabout the size of a grain of rice) and a wide S0-8
for better power dissipation.
This op amp line includesÐ
LM6171 100 MHz Low Distortion Amplifier with l
3000 V/ms slew rate. Voltage Feedback design
draws only 2.5 mA. Specified at g 15V and g 5V
supplies.
LM7131 TinyPaK (SOT23-5) Video amplifier with 70 MHz
gain bandwidth. Specified at 3V, 5V and g 5V
supplies.
LM7171 200 MHz Voltage Feedback amplifier with 100
mA output current and 4000V/ms slew rate. Supply current of 6.5 mA. Specified at g 15V and
g 5V.
Information on these parts is available from your National
Semiconductor representative.
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External Compensation Capacitor
An external compensation capacitor of 27 pF is recommended for use with the LM6311. The capacitor should be
connected between pin 5 and ground, and should be placed
close to the LM6311. This capacitor increases the phase
margin of the LM6311, allowing it to be used in low gain
circuits, such as AV e a 1.
A lower value of compensation capacitor (such as 10 pF)
will increase bandwidth at the expense of phase margin.
This will result in more peaking and ringing with low gain
circuits (AV less than 5).
A lower value of compensation capacitor can be useful for
single supply ( a 5V only) circuits.
Designer should avoid very low values of compensation capacitors in low gain circuits since this will reduce phase margin and may cause some circuits to oscillate.
SPICE Macromodel
A SPICE macromodel of the LM6311 and many other National Semiconductor op amps is available at no charge
from your National Semiconductor representative.
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Reflections
The output slew rate of the LM6311 is fast enough to produce reflected signals in many cables and long circuit
traces. For best pulse performance, it may be necessary
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Physical Dimensions inches (millimeters) unless otherwise noted
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8-Pin Small Outline Package
Order Number LM6311IM or LM6311MX
NS Package Number M08A
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Lit. Ý108288-001
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LM6311 Low Noise High Speed Voltage
Feedback Operational Amplifier
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
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8-Pin Molded DIP Package
Order Number LM6311IN
NS Package Number N08E
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