NSC LM6310IMX High speed low power operational amplifier with tri-state output Datasheet

LM6310
High Speed Low Power Operational
Amplifier with TRI-STATEÉ Output
General Description
Features
The LM6310 is a video speed operational amplifier with a
fast, easy to use disable function. This disable function puts
the amplifier output into a high impedance state. This makes
the LM6310 ideal for distributed video multiplexing, where
channels can be on different boards. This can enhance
manufacturing flexibility by making it easy to add or delete
options to basic designs.
The disable function can also be used for half-duplex communication. The disable function also reduces power consumption. The LM6310 uses a current feedback design for
improved gain flatness, making it a good choice for high
quality video designs. Operating from g 5V supplies, the
LM6310 is ideal for low power designs.
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
90 MHz b3 dB bandwidth
TRI-STATE output disable to high impedance
Disable time k 25 ns
TTL/CMOS compatible disable input
Typical differential gain 0.05%
Typical differential Phase 0.33§
60 mA output current
Typical supply current k 4.5 mA
k 1 mA current when disabled
Specified for g 5V operation
Applications
Y
Y
Y
Y
Y
Cable TV Set Top Boxes
Video Multiplexers and Multimedia Cards
Virtual Reality and Desktop Video
Portable Video
Video Distribution
Connection Diagram
8-Pin DIP/SO-8
TL/H/12545 – 1
Top View
TL/H/12545 – 2
Package
Ordering
Information
NSC Drawing
Number
Package
Marking
Transport Media
8-Pin DIP
LM6310IN
N08E
LM6310IN
Rails
8-Pin SO-8
LM6310IM
M08A
LM6310IM
Rails
8-Pin SO-8
LM6310IMX
M08A
LM6310IM
2.5k Units Tape and Reel
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
TinyPaKTM is a trademark of National Semiconductor Corporation.
C1996 National Semiconductor Corporation
TL/H/12545
RRD-B30M66/Printed in U. S. A.
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LM6310 High Speed Low Power Operational Amplifier with TRI-STATE Output
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
LM6310I
ESD Tolerance (Note 2)
Differential Input Voltage
Thermal resistance (iJA)
N Package, 8-pin Molded DIP
SO-8 Package, 8-Pin Surface Mount
1500V
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 Temp. (soldering, 10 sec.)
Storage Temperature Range
g 2V
(V a ) a 0.1V, (Vb)b0.1V
12V
g 5 mA
g 80 mA
80 mA
260§ C
Vb e b5V, V a e a 5V
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 100X. Boldface limits apply at the temperature extremes
Symbol
Parameter
Conditions
Typ
(Note 5)
LM6310I
Limit
(Note 6)
Units
5
9
mV
max
VOS
Input Offset Voltage
1
TCVOS
Input Offset Voltage
Average Drift
30
IB
Input Bias Current
Non-Inverting ( a ) Input
0.2
1.5
3.0
mA
max
IB
Input Bias Current
Inverting (b) Input
2
8
14
mA
max
RIN
Input Resistance
Non-Inverting ( a ) Input
6
MX
RIN
Input Resistance
Inverting (b) Input
180
X
CMRR
Common Mode
Rejection Ratio
b 1.0V s VCM s a 1.0V
a PSRR
Positive Power
Supply Rejection Ratio
b PSRR
Negative Power
Supply Rejection Ratio
CIN
Common-Mode
Input Capacitance
VO
Output Swing
50
43
40
db
min
V a e 4.5V to 5.5V
Vb e b5.0V
52
46
42
db
min
V a e 5.0V
Vb e b4.5V to b5.5V
52
46
42
db
min
2
RL e 100X
RL e %
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mV/§ C
2
pF
3.5
3.1
2.4
V
min
b 2.8
b 2.7
b 1.6
V
max
4.0
3.9
3.7
V
min
b 3.3
b 3.2
b 2.8
V
max
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 100X. Boldface limits apply at the temperature extremes (Continued)
Symbol
Parameter
Conditions
ISC
Output Current
10X to 0V
Sourcing
ROUT
Output Resistance
Closed Loop
IS
Supply Current for
Normal Operation Mode
DISABLE (Pin 8) l 2.0V
IS
Supply Current Powerdown
(TRI-STATE) Mode
DISABLE (Pin 8) k 0.8V
Typ
(Note 5)
LM6310I
Limit
(Note 6)
Units
60
44
20
mA
min
X
max
0.06
3.5
4.5
5.0
mA
max
0.8
1.0
1.2
mA
max
g 5V AC 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 100X. Boldface limits apply at the temperature extremes
Symbol
Parameter
Conditions
Typ
(Note 5)
LM6310I
Limit
(Note 6)
Units
SR
Slew Rate
AV e a 2, 2V Output Pulse
300
V/ms
b 3 dB BW
b 3db Bandwidth
AV e a 2
90
MHz
Dg
Differential Gain
(Note 7)
AV e a 2, 150X Load (75X Back-Terminated)
1 kX Pull-Down to b5V on Output
0.05
%
Dp
Differential Phase
(Note 7)
AV e a 2, 150X Load (75X Back-Terminated)
1 kX Pull-Down to b5V on Output
0.33
§
en
Input-Referred
Voltage Noise
f e 1 MHz
Input-Referred Current Noise
Non-Inverting (b) Input
f e 1 MHz
Input-Referred Current
Noise Inverting (b) Input
f e 1 MHz
tON
Turn On Time
tOFF
5
3
nV
0Hz
pA
0Hz
pA
12
0Hz
DISABLE (Pin 8) Low to High
50
ns
Turn Off Time
DISABLE (Pin 8) High to Low
25
ns
Output Isolation
Output Isolation from Inputs when
DISABLE e Low 10 MHz
55
db
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may 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.
Note 7: Differential Gain and Phase performance is sensitive to layout. Follow layout suggestions in text for best results.
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Typical Performance Characteristics
AV e a 2, RF e 348X, V a e a 5V, Vb e b5V, RL e 100X, TJ e 25§ C unless otherwise noted
LM6310 Non-Inverting Input
Current vs Temperature
LM6310 Input Offset
Voltage vs Temperature
TL/H/12545–3
TL/H/12545 – 4
LM6310 Inverting Input
Current vs Temperature
Output Voltage Swing
vs Load (Volts Peak-to-Peak)
TL/H/12545 – 6
TL/H/12545–5
LM6310 Common Mode
Rejection Ratio vs Frequency
LM6310 Power Supply
Rejection Ratio vs Frequency
TL/H/12545–7
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TL/H/12545 – 8
4
Typical Performance Characteristics
AV e a 2, RF e 348X, V a e a 5V, Vb e b5V, RL e 100X, TJ e 25§ C unless otherwise noted (Continued)
Output Signal Isolation in Disable Mode
Reference
Level e 100 mV
Marker
4 025 567 Hz
68.8755 mV
TL/H/12545 – 9
LM6310 Normal Operation. Disable e High.
Note reference level is 100 mV.
4 MHz signal is at 69 mV.
Reference
Level e 50 mV
Marker
4 025 567 Hz
28.9085 mV
TL/H/12545 – 10
LM6310 Disable e Low.
Note that the reference level is 50 mV.
The 4 MHz signal is near the noise level, attenuated l 1000:1.
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Typical Performance Characteristics (Continued)
RF e 348X, V a e a 5V, Vb e b5V, RL e 100X, TJ e 25§ C unless otherwise noted
Gain of a 1
AV e a 1 Non-Inverting
AV e a 1 Pulse Response
TL/H/12545–11
See Application Information for
discussion of RF value for AV e a 1
TL/H/12545 – 12
Note: RF e 1 kX
AV e a 1 Gain and Phase vs Frequency
TL/H/12545 – 13
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Typical Performance Characterisitcs (Continued)
RF e 348X, V a e a 5V, Vb e b5V, RL e 100X, TJ e 25§ C unless otherwise noted
Gain of a 2
AV e a 2 Non-Inverting
TL/H/12545 – 14
AV e a 2 Small Signal
Pulse Response
AV e a 2 Large Signal
Pulse Response
TL/H/12545 – 15
TL/H/12545 – 16
AV e a 2 Gain and Phase vs Frequency
TL/H/12545 – 17
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Typical Performance Characteristics (Continued)
RF e 348X, V a e a 5V, Vb e b5V, RL e 100X, TJ e 25§ C unless otherwise noted
Gain of a 5
AV e a 5 Non-Inverting
AV e a 5 Pulse Response
TL/H/12545–18
TL/H/12545 – 19
AV e a 5 Gain and Phase vs Frequency
TL/H/12545 – 20
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8
Typical Performance Characteristics (Continued)
RF e 348X, V a e a 5V, Vb e b5V, RL e 100X, TJ e 25§ C unless otherwise noted
Gain of b1
AV e b1 Inverting
AV e b1 Pulse Response
TL/H/12545 – 21
TL/H/12545 – 22
AV e b1 Gain and Phase vs Frequency
TL/H/12545 – 23
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Typical Performance Characteristics (Continued)
RF e 348X, V a e a 5V, Vb e b5V, RL e 100X, TJ e 25§ C unless otherwise noted
AV e b2 Inverting
AV e b2 Gain and Phase vs Frequency
TL/H/12545–24
TL/H/12545 – 25
Gain of b5
AV e b5 Inverting
AV e b5 Gain and Phase vs Frequency
TL/H/12545–26
TL/H/12545 – 28
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Application Information
nection), the additional functions can be built on the add-in
cards. By using LM6310s on both the basic board and the
add-in cards, video and other signals can be digitally
switched to implement the new add-in functions. Using
LM6310s avoids adding the cost of a dedicated multiplexer
in the low cost system, and increases design flexibility.
GENERAL INFORMATION
The LM6310 is a high speed complementary bipolar amplifier with good video performance. The output of the LM6310
can be turned off with a logic level signal on the DISABLE
pin. The output then goes to a high impedance state
(TRI-STATE) which makes it easy to multiplex signals with
the LM6310. The LM6310 responds very quickly to the DISABLE input, (under 25 ns) making it useful for video effects
and adding or selecting data from video streams, such as
TELTEXT.
EASY TO USE, COST-EFFECTIVE CURRENT FEEDBACK
When used with good high speed layout in a circuit like
those shown in the section on typical performance curves,
the LM6310 will provide wide bandwidth, high slew and
good video performance. Modern current feedback devices
can provide higher bandwidth at lower current and at lower
cost than conventional voltage feedback devices.
Note: The LM6310 will operate normally when there is no connection to the
DISABLE pin.
The LM6310 has low power consumption for a high speed
part, typically k 4.0 mA. When the output is disabled the
typical current consumption drops below 1.0 mA. This
makes the LM6310 ideal for portable video equipment.
The LM6310 is available in two package types: DIPs for
through hole designs, and SO-8 surface mount packages.
The LM6310 uses a current feedback design to achieve
good video performance at low current and low cost.
Note on Performance Curves and
Datasheet Limits
Important: Performance curves represent an average of parts, and are not
limits .
COMMON MODE REJECTION RATIO
The CMRR of 50 dB is valid for inputs which are within 1V of
ground for g 5V supplies. In other words, the input should
be within 1V of the center of the V a and Vb power supply
rails. Moving the inputs away from the center of the supplies
will result in reduced performance and non-linearities.
Benefits of the LM6310
The LM6310 provides good video performance for consumer and portable applications at low current and low cost.
The disable option can reduce power consumption in portable applications.
The video multiplexing capability of the disable function can
also be used to improve the testability of systems by providing an easy means to open the analog signal path and insert
test or reference signals.
Since the multiplexing configuration is a function of the output and disable signal wiring, using multiple LM6310’s has
some strong advantages over a one chip video multiplexer.
First, larger multiplexers are possibleÐwith careful layout,
up to 8 video inputs can be multiplexed.
Frequently in multiplexer designs, one or more of the input
signals will need to be buffered with an amplifier, and the
output may also need a buffer or driver amplifier. Wiring up
LM6310s to do multiplexing lets the LM6310 act as both the
input buffer and the output driver. This can reduce parts and
save money. In addition to reducing cost, the signals will go
through fewer amplifiers. This can mean improved signal
quality in addition to lower cost.
NON-INVERTING ( a ) INPUT
CURRENT vs TEMPERATURE
This curve is relatively flat over temperature (typically under
1 mA), that even an input source impedance of 2 kX will
result in only a millivolt shift on the input voltage.
OUTPUT VOLTAGE SWING vs LOAD
This curve shows that almost all of the output swing is available for the 150X loads usually used in back-terminated
75X video systems.
OUTPUT SIGNAL ISOLATION IN DISABLE MODE
The top graph shows the spectrum analyzer output of an
LM6310 in normal operaiton. The 4 MHz peak has an amplitude of 69 mV. Note that the reference level is 100 millivolts
(100 mV), second and third harmonics are present, and the
noise floor is towards the bottom of the graph.
With the LM6310 disabled, we need to greatly increase the
gain of the spectrum analyzer to see the feedthrough of the
4 MHz signal. Note that the reference level is now 50 microvolts (50 mV) and the noise floor is towards the middle of
the graph. The 4 MHz signal now has an amplitude of
28.9 mV, less than one-thousandth the normal signal.
Note that the LM6310 will function normally (output on) with
the DISABLE input (pin 8) left floating (not connected).
DESIGN ADAPTABILITY AND SYSTEM
DESIGN FLEXIBILITY
Using the LM6310 allows more adaptable, cost effective design. If you need a 3 input multiplexer, you can make one,
avoiding the extra cost of unused devices of quad multiplexer. If you need a 5 input multiplexer, you can design this with
5 LM6310s, saving the space and cost of two video multiplexer chips.
Using the LM6310 on a distributed multiplexer can improve
manufacturing flexibility. You can design a low cost system
with the minimal number functions needed for the low end
of the market. Additional functions (close captioning,
TELETEXT, digital video, information services, etc.) can be
designed on to add-in cards. Since the LM6310 will operate
normally when the DISABLE input is floating (no con-
PULSE RESPONSE AND GAIN vs FREQUENCY
FOR AV e a 1
The feedback resistor (RF) value for the pulse response
photo is 1 kX. A value of 1 kX to 2 kX is recommended for
all voltage follower (AV e a 1) circuits using the LM6310.
The gain and phase plot for AV e a 1 was done with the
usual value of RF e 348X for comparison with the other
gain and phase plots.
11
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Application Information (Continued)
Using the LM6310
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.
LIMITS AND PRECAUTIONS
SUPPLY VOLTAGE
The absolute maximum supply voltage which may be applied to the LM6310 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.
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 2V across the inputs. This limit also applies
when there is no power supplied to the op amp. This may
not be a problem in most conventional op amp designs,
however, designers should avoid using the LM6310 as comparator or forcing the inputs to different voltages.
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.
FEEDBACK RESISTOR VALUES (RF)
Since the LM6310 is a current feedback amplifier, the value
of the feedback resistor is important to the performance of
the op amp. For circuits other than voltage followers, the
fastest pulse response is usually obtained with a resistor
value of 348X. To get higher gain, decrease the source resistor value (RS), while leaving the feedback resistor at
348X. (Schematics for various gains are shown in the typical performance curves section of this datasheet.)
Current feedback amplifiers generally do not tolerate reactive components in the feedback path. Therefore, do not
bypass the feedback resistor (RF) with a feedback capacitor. This will result in instability.
Overshoot and ringing of the LM6310 can be reduced by
increasing the value of the feedback resistor above 348X.
The value of 348X will normally produce a near critically
damped pulse response, with about 3% – 5% overshoot.
Overshoot and bandwidth peaking may be undesirable in
some designs. Selecting a larger value for the feedback resistor will reduce the overshoot and bandwidth peaking. Too
large a value will reduce the circuit bandwidth and degrade
pulse response. Do not place a capacitor across feedback
resistor.
For voltage followers (AV e a 1) there is no source resistance. A feedback resistor must be usedÐdirect connect
from the output to the inverting input will usually result in
oscillation. Values in the range of 1 kX –2 kX usually give
good results. The pulse response photo for AV e a 1 was
obtained with a 1 kX feedback resistor.
Since the small stray capacitance from the circuit layout,
other components, and specific circuit bandwidth requirements will vary, it is often useful to select final values based
on prototypes which are similar in layout to the production
circuit boards.
LAYOUT AND POWER SUPPLY BYPASSING
Since the LM6310 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
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 – 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 LM6310 is built on a high performance bipolar process.
The transistors used in this process have bandwidths much
higher that the LM6310 itself. These transistors have a potential to oscillate or ring at 400 b1 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 inch
(3 mm) or less is recommended for best results.
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Reflections
The output slew rate of the LM6310 is fast enough to produce reflected signals in many cables and long circuit
traces. For best pulse performance, it may be necessary 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.
12
Application Information (Continued)
OTHER AMPLIFIERS WITH OUTPUT
DISABLE FUNCTIONS
VIDEO GAIN OF a 2
The design of the LM6310 has been optimized for gain of
a 2 video applications. The differential gain and phase performance of the LM6310 can be improved by adding a 1 kX
pull down to b5V to the output. See Figure 1 .
Typical values for differential gain and phase are 0.5% differential gain and 0.1 degree differential phase.
The LMC6681, LMC6682, and LMC6684 are 1 MHz amplifiers with TRI-STATE outputs which can be used for audio
and low frequency multiplexing like the LM6310 is used for
video multiplexing.
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 15, 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 the wide
S0-8 for better power dissipation.
This op amp line includes:
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 4000 V/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.
VIDEO MULTIPLEXING
Figure 2 shows a video multiplexer made from two LM6310
and a logic device which can supply TTL equivalent level to
the DISABLE pins of the LM6310s. Only one DISABLE line
should be high at any one time.
Note that since a floating value on the DISABLE input is the
same as a high input, if all of the logic device’s output go to
a TRI-STATE or high impedance mode, all the LM6310’s
will turn on. This should be avoided.
Use adequate decoupling on the logic device to reduce
noise feedthrough of digital system and power noise to the
video signals. If it is not possible to adequately decouple the
logic device, consider using a small digital buffer, such as a
hex schmidt trigger inverter, which can be decoupled with
multiple capacitors and/or ferrite beads to reduce digital
noise.
Figure 3 shows a four input video multiplexer. With careful
layout, differential gain and phase performance almost as
good as a single LM6310 can be achieved.
A single 1 kX pull down to b5V should be used. Differential
gain of about 0.05% and differential phase of about 0.3 degree are possible with the 4:1 multiplexer.
SPICE MACROMODEL
A SPICE macromodel of the LM6310 and many other National Semiconductor op amps is available at no charge
from your National Semiconductor representative.
AV e a 2
TL/H/12545 – 29
FIGURE 1. Improving Video Differential Gain and Phase with 1 kX pull down to b5V
13
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Application Information (Continued)
TL/H/12545 – 30
Note: Use adequate decoupling on logic device to reduce noise feed through to video signal.
FIGURE 2. Video Multiplexer. Video A Selected
TL/H/12545 – 31
Note: Only one DISABLE signal should be high at any time, the other 3 signals should be low.
FIGURE 3. Four Input Multiplexer
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14
Physical Dimensions inches (millimeters) unless otherwise noted
8-Pin Small Outline Package
Order Number LM6310IM or LM6310IMX
NS Package Number M08A
15
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LM6310 High Speed Low Power Operational Amplifier with TRI-STATE Output
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Lit. Ý108287-001
8-Pin Molded DIP
8-Lead (0.300× Wide) Molded Dual-In-Line Package
Order Number LM6310IN
NS Package Number N08E
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