LM7171AMWFQMLV [NSC]

Very High Speed, High Output Current, Voltage Feedback Amplifier; 超高速,高输出电流,电压反馈放大器
LM7171AMWFQMLV
型号: LM7171AMWFQMLV
厂家: National Semiconductor    National Semiconductor
描述:

Very High Speed, High Output Current, Voltage Feedback Amplifier
超高速,高输出电流,电压反馈放大器

放大器
文件: 总24页 (文件大小:790K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
October 20, 2010  
LM7171QML  
Very High Speed, High Output Current, Voltage Feedback  
Amplifier  
General Description  
Features  
The LM7171 is a high speed voltage feedback amplifier that  
has the slewing characteristic of a current feedback amplifier;  
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 consuming only  
6.5 mA of supply current. It is ideal for video and high speed  
signal processing applications such as HDSL and pulse am-  
plifiers. With 100 mA output current, the LM7171 can be used  
for video distribution, as a transformer driver or as a laser  
diode driver.  
(Typical Unless Otherwise Noted)  
Easy-To-Use Voltage Feedback Topology  
Very High Slew Rate: 2400V/μs  
Wide Unity-Gain Bandwidth: 200 MHz  
−3 dB Frequency @ AV = +2: 220 MHz  
Low Supply Current: 6.5 mA  
High Open Loop Gain: 85 dB  
High Output Current: 100 mA  
Specified for ±15V and ±5V Operation  
Available with radiation guarantee  
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.  
Total Ionizing Dose  
ELDRS Free  
300 krad(Si)  
300 krad(Si)  
Applications  
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  
Ordering Information  
NS Part Number  
SMD Part Number  
5962-9553601QPA  
NS Package Number  
Package Description  
8LD Ceramic Dip  
LM7171AMJ-QML  
J08A  
LM7171AMJFQMLV  
HIGH DOSE RATE (Note 5)  
5962F9553601VPA  
300 krad(Si)  
J08A  
8LD Ceramic Dip  
LM7171AMWFQMLV  
HIGH DOSE RATE (Note 5)  
5962F9553601VHA  
300 krad(Si)  
W10A  
10LD Ceramic Flatpack  
LM7171AMWFLQMLV  
ELDRS FREE (Note 14)  
5962F9553602VHA  
300 krad(Si)  
W10A  
WG10A  
WG10A  
10LD Ceramic Flatpack  
10LD Ceramic SOIC  
10LD Ceramic SOIC  
LM7171AMWG-QML  
5962-9553601QXA  
LM7171AMWGFQMLV  
HIGH DOSE RATE (Note 5)  
5962F9553601QXA  
300 krad(Si)  
LM7171AMWGFLQV  
ELDRS FREE (Note 14)  
5962F9553602VXA  
300 krad(Si)  
WG10A  
10LD Ceramic SOIC  
VIP® is a registered trademark of National Semiconductor Corporation.  
© 2010 National Semiconductor Corporation  
201595  
www.national.com  
Connection Diagrams  
8-Pin Ceramic DIP  
10-Pin Ceramic SOIC & Ceramic Flatpack  
20159502  
Top View  
20159504  
Top View  
Simplified Schematic Diagram  
20159509  
Note: M1 and M2 are current mirrors.  
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2
Typical Performance  
Large Signal Pulse Response  
AV = +2, VS = ±15V  
20159501  
3
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Absolute Maximum Ratings (Note 1)  
Supply Voltage (V+–V)  
36V  
±10V  
730mW  
Continuous  
Differential Input Voltage (Note 10)  
Maximum Power Dissipation (Note 2)  
Output Short Circuit to Ground (Note 6)  
Storage Temperature Range  
−65°C TA +150°C  
Thermal Resistance (Note 13)  
ꢀθJA  
8LD Ceramic Dip (Still Air)  
8LD Ceramic Dip (500LF/Min Air flow)  
10LD Ceramic Flatpack (Still Air)  
10LD Ceramic Flatpack (500LF/Min Air flow)  
10LD Ceramic SOIC (Still Air)  
10LD Ceramic SOIC (500LF/Min Air flow)  
ꢀθJC  
106°C/W  
53°C/W  
182°C/W  
105°C/W  
182°C/W  
105°C/W  
8LD Ceramic Dip  
10LD Ceramic Flatpack  
10LD Ceramic SOIC (Note 3)  
Package Weight (Typical)  
8LD Ceramic Dip  
10LD Ceramic Flatpack  
10LD Ceramic SOIC  
Maximum Junction Temperature (Note 2)  
ESD Tolerance (Note 4)  
3°C/W  
5°C/W  
5°C/W  
965mg  
235mg  
230mg  
150°C  
3000V  
Recommended Operating Conditions (Note 1)  
Supply Voltage  
5.5V VS 36V  
−55°C TA +125°C  
Operating Temperature Range  
Quality Conformance Inspection  
Mil-Std-883, Method 5005 - Group A  
Subgroup  
Description  
Static tests at  
Temp °C  
1
2
25  
125  
-55  
25  
Static tests at  
3
Static tests at  
4
Dynamic tests at  
Dynamic tests at  
Dynamic tests at  
Functional tests at  
Functional tests at  
Functional tests at  
Switching tests at  
Switching tests at  
Switching tests at  
Settling time at  
Settling time at  
Settling time at  
5
125  
-55  
25  
6
7
8A  
8B  
9
125  
-55  
25  
10  
11  
12  
13  
14  
125  
-55  
25  
125  
-55  
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4
LM7171 (±15) Electrical Characteristics  
DC Parameters (Note 5)  
The following conditions apply, unless otherwise specified.  
DC:  
TJ = 25°C, V+ = +15V, V= −15V, VCM = 0V, and RL > 1MΩ  
Sub-  
groups  
Symbol  
Parameter  
Conditions  
Notes  
Min Max  
Units  
VIO  
Input Offset Voltage  
−1.0  
−7.0  
1.0  
7.0  
10  
mV  
mV  
µA  
µA  
µA  
µA  
µA  
µA  
dB  
dB  
dB  
dB  
dB  
dB  
dB  
dB  
V
1
2, 3  
1
+IIB  
Input Bias Current  
Input Bias Current  
Input Offset Current  
12  
2, 3  
1
-IIB  
10  
12  
2, 3  
1
IIO  
−4.0  
−6.0  
85  
4.0  
6.0  
2, 3  
1
CMRR  
PSRR  
AV  
Common Mode Rejection Ratio VCM = ±10V  
70  
2, 3  
1
Power Supply Rejection Ratio  
Large Signal Voltage Gain  
VS = ±15V to ±5V  
85  
80  
2, 3  
1
(Note 7)  
(Note 7)  
(Note 7)  
(Note 7)  
80  
RL = 1K, VO = ±5V  
RL = 100Ω, VO = ±5V  
RL = 1KΩ  
75  
2, 3  
1
75  
70  
2, 3  
1
VO  
Output Swing  
13  
-13  
12.7 -12.7  
10.5 -9.5  
V
2, 3  
1
V
RL = 100Ω  
9.5  
105  
95  
-9.0  
V
2, 3  
1
Output Current (Open Loop)  
Supply Current  
Sourcing  
(Note 8)  
(Note 8)  
(Note 8)  
(Note 8)  
mA  
mA  
mA  
mA  
mA  
mA  
RL = 100Ω  
2, 3  
1
Sinking  
-95  
-90  
8.5  
9.5  
RL = 100Ω  
2, 3  
1
IS  
2, 3  
AC Parameters (Note 5)  
The following conditions apply, unless otherwise specified.  
AC:  
TJ = 25°C, V+ = +15V, V= −15V, VCM = 0V, and RL > 1MΩ  
Sub-  
groups  
Symbol  
Parameter Conditions  
Notes  
Min Max  
Units  
SR  
GBW  
Slew Rate  
Unity-Gain Bandwidth  
AV = 2, VI = ±2.5V  
3nS Rise & Fall time  
(Note 11), 2000  
(Note 9)  
V/µS  
4
4
(Note 12) 170  
MHz  
5
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DC Drift Parameters (Note 5)  
The following conditions apply, unless otherwise specified.  
DC:  
TJ = 25°C, V+ = +15V, V= −15V, VCM = 0V, and RL > 1MΩ  
Delta calculations performed on QMLV devices at group B , subgroup 5.  
Sub-  
groups  
Symbol  
VIO  
Parameter  
Conditions  
Notes  
Min Max  
Units  
Input Offset Voltage  
Input Bias Current  
Input Bias Current  
-250 250  
-500 500  
-500 500  
µV  
nA  
nA  
1
1
1
+IBias  
-IBias  
LM7171 (±5) Electrical Characteristics  
DC Parameters (Note 5)  
The following conditions apply, unless otherwise specified.  
DC:  
TJ = 25°C, V+ = +5V, V= −5V, VCM = 0V, and RL > 1MΩ  
Sub-  
groups  
Symbol  
Parameter  
Conditions  
Notes  
Min Max  
Units  
VIO  
Input Offset Voltage  
−1.5  
−7.0  
1.5  
7.0  
10  
mV  
mV  
µA  
µA  
µA  
µA  
µA  
µA  
dB  
dB  
dB  
dB  
dB  
dB  
V
1
2, 3  
1
+IIB  
-IIB  
Input Bias Current  
Input Bias Current  
Input Offset Current  
12  
2, 3  
1
10  
12  
2, 3  
1
IIO  
−4.0  
−6.0  
80  
4.0  
6.0  
2, 3  
1
CMRR  
AV  
Common Mode Rejection Ratio VCM = ±2.5V  
70  
2, 3  
1
Large Signal Voltage Gain  
(Note 7)  
(Note 7)  
(Note 7)  
(Note 7)  
75  
RL = 1K, VO = ±1V  
RL = 100Ω, VO = ±1V  
RL = 1KΩ  
70  
2, 3  
1
72  
67  
2, 3  
1
VO  
Output Swing  
3.2  
3.0  
2.9  
-3.2  
-3.0  
-2.9  
V
2, 3  
1
V
RL = 100Ω  
2.8 -2.75  
V
2, 3  
1
Output Current (Open Loop)  
Supply Current  
Sourcing  
(Note 8)  
(Note 8)  
(Note 8)  
(Note 8)  
29  
mA  
mA  
mA  
mA  
mA  
mA  
RL = 100Ω  
28  
2, 3  
1
Sinking  
-29  
-27.5  
8.0  
9.0  
RL = 100Ω  
2, 3  
1
IS  
2, 3  
DC Drift Parameters (Note 5)  
The following conditions apply, unless otherwise specified.  
DC:  
TJ = 25°C, V+ = +5V, V= −5V, VCM = 0V, and RL > 1MΩ  
Delta calculations performed on QMLV devices at group B , subgroup 5.  
Sub-  
groups  
Symbol  
VIO  
Parameter  
Conditions  
Notes  
Min Max  
Units  
Input Offset Voltage  
Input Bias Current  
Input Bias Current  
-250 250  
-500 500  
-500 500  
µV  
nA  
nA  
1
1
1
+IBias  
-IBias  
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Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is  
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed  
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test  
conditions.  
Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (package  
junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax - TA)/  
θ
JA or the number given in the Absolute Maximum Ratings, whichever is lower.  
Note 3: The package material for these devices allows much improved heat transfer over our standard ceramic packages. In order to take full advantage of this  
improved heat transfer, heat sinking must be provided between the package base (directly beneath the die), and either metal traces on, or thermal vias through,  
the printed circuit board. Without this additional heat sinking, device power dissipation must be calculated using θJA, rather than θJC, thermal resistance. It must  
not be assumed that the device leads will provide substantial heat transfer out the package, since the thermal resistance of the leadframe material is very poor,  
relative to the material of the package base. The stated θJC thermal resistance is for the package material only, and does not account for the additional thermal  
resistance between the package base and the printed circuit board. The user must determine the value of the additional thermal resistance and must combine  
this with the stated value for the package, to calculate the total allowed power dissipation for the device.  
Note 4: Human body model, 1.5 kΩ in series with 100 pF.  
Note 5: Pre and post irradiation limits are identical to those listed under AC and DC electrical characteristics except as listed in the Post Radiation Limits Table.  
These parts may be dose rate sensitive in a space environment and demonstrate enhanced low dose rate effect. Radiation end point limits for the noted parameters  
are guaranteed only for the conditions as specified in MIL-STD-883, per Test Method 1019, Condition A.  
Note 6: 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 7: Large signal voltage gain is the total output swing divided by the input signal required to produce that swing. For VS = ±15V, VOUT = ±5V. For VS = ±5V,  
VOUT = ±1V.  
Note 8: The open loop output current is guaranteed, by the measurement of the open loop output voltage swing, using 100Ω output load.  
Note 9: Slew Rate measured between ±4V.  
Note 10: Differential input voltage is applied at VS = ±15V.  
Note 11: See AN00001 for SR test circuit.  
Note 12: See AN00002 for GBW test circuit.  
Note 13: All numbers apply for packages soldered directly into a PC board.  
Note 14: Pre and post irradiation limits are identical to those listed under AC and DC electrical characteristics except as listed in the Post Radiation Limits Table.  
Low dose rate testing has been peformed on a wafer-by-wafer basis, per Test Method 1019, Condition D of MIL-STD-883, with no enhanced low dose rate  
sensitivity (ELDRS).  
7
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Typical Performance Characteristics unless otherwise noted, TA= 25°C  
Supply Current  
vs Supply Voltage  
Supply Current  
vs Temperature  
20159563  
20159564  
Input Offset Voltage  
vs Temperature  
Input Bias Current  
vs Temperature  
20159566  
20159565  
Short Circuit Current  
vs Temperature (Sourcing)  
Short Circuit Current  
vs Temperature (Sinking)  
20159567  
20159568  
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Output Voltage  
vs Output Current  
Output Voltage  
vs Output Current  
20159569  
20159570  
CMRR vs Frequency  
PSRR vs Frequency  
20159571  
20159572  
PSRR vs Frequency  
Open Loop Frequency  
Response  
20159573  
20159551  
9
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Open Loop Frequency  
Response  
Gain-Bandwidth Product  
vs Supply Voltage  
20159553  
20159552  
Gain-Bandwidth Product  
vs Load Capacitance  
Large Signal Voltage Gain  
vs Load  
20159555  
20159554  
Large Signal Voltage Gain  
vs Load  
Input Voltage Noise  
vs Frequency  
20159556  
20159557  
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10  
Input Voltage Noise  
vs Frequency  
Input Current Noise  
vs Frequency  
20159558  
20159559  
Input Current Noise  
vs Frequency  
Slew Rate  
vs Supply Voltage  
20159561  
20159560  
Slew Rate  
vs Input Voltage  
Slew Rate  
vs Load Capacitance  
20159562  
20159523  
11  
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Open Loop Output  
Impedance vs Frequency  
Open Loop Output  
Impedance vs Frequency  
20159525  
20159526  
Large Signal Pulse  
Response AV = −1,  
VS = ±15V  
Large Signal Pulse  
Response AV = −1,  
VS = ±5V  
20159527  
20159528  
Large Signal Pulse  
Response AV = +2,  
VS = ±15V  
Large Signal Pulse  
Response AV = +2,  
VS = ±5V  
20159529  
20159530  
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12  
Small Signal Pulse  
Response AV = −1,  
VS = ±15V  
Small Signal Pulse  
Response AV = −1,  
VS = ±5V  
20159531  
20159532  
Small Signal Pulse  
Response AV = +2,  
VS = ±15V  
Small Signal Pulse  
Response AV = +2,  
VS = ±5V  
20159533  
20159534  
Closed Loop Frequency  
Response vs Supply  
Voltage (AV = +2)  
Closed Loop Frequency  
Response vs Capacitive  
Load (AV = +2)  
20159535  
20159536  
13  
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Closed Loop Frequency  
Response vs Capacitive  
Load (AV = +2)  
Closed Loop Frequency  
Response vs Input Signal  
Level (AV = +2)  
20159537  
20159543  
20159540  
20159538  
20159539  
20159544  
Closed Loop Frequency  
Response vs Input Signal  
Level (AV = +2)  
Closed Loop Frequency  
Response vs Input Signal  
Level (AV = +2)  
Closed Loop Frequency  
Response vs Input Signal  
Level (AV = +2)  
Closed Loop Frequency  
Response vs Input Signal  
Level (AV = +4)  
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14  
Closed Loop Frequency  
Response vs Input Signal  
Level (AV = +4)  
Closed Loop Frequency  
Response vs Input Signal  
Level (AV = +4)  
20159545  
20159541  
Closed Loop Frequency  
Response vs Input Signal  
Level (AV = +4)  
Total Harmonic Distortion  
vs Frequency (Note 15)  
20159546  
20159542  
Total Harmonic Distortion  
vs Frequency (Note 15)  
Undistorted Output Swing  
vs Frequency  
20159547  
20159549  
15  
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Undistorted Output Swing  
vs Frequency  
Undistorted Output Swing  
vs Frequency  
20159548  
20159550  
Harmonic Distortion  
vs Frequency  
Harmonic Distortion  
vs Frequency  
20159574  
20159575  
Maximum Power Dissipation  
vs Ambient Temperature  
20159520  
Note 15: The THD measurement at low frequency is limited by the test instrument.  
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16  
Application Notes  
Layout Consideration  
PRINTED CIRCUIT BOARDS AND HIGH SPEED OP AMPS  
LM7171 Performance Discussion  
There are many things to consider when designing PC boards  
for high speed op amps. Without proper caution, it is very easy  
to have excessive ringing, oscillation and other degraded AC  
performance in high speed circuits. As a rule, the signal traces  
should be short and wide to provide low inductance and low  
impedance paths. Any unused board space needs to be  
grounded to reduce stray signal pickup. Critical components  
should also be grounded at a common point to eliminate volt-  
age drop. Sockets add capacitance to the board and can  
affect high frequency performance. It is better to solder the  
amplifier directly into the PC board without using any socket.  
The LM7171 is a very high speed, voltage feedback amplifier.  
It consumes only 6.5 mA supply current while providing a uni-  
ty-gain bandwidth of 200 MHz and a slew rate of 4100V/μs. It  
also has other great features such as low differential gain and  
phase and high output current.  
The LM7171 is a true voltage feedback amplifier. Unlike cur-  
rent feedback amplifiers (CFAs) with a low inverting input  
impedance and a high non-inverting input impedance, both  
inputs of voltage feedback amplifiers (VFAs) have high  
impedance nodes. The low impedance inverting input in  
CFAs and a feedback capacitor create an additional pole that  
will lead to instability. As a result, CFAs cannot be used in  
traditional op amp circuits such as photodiode amplifiers, I-to-  
V converters and integrators where a feedback capacitor is  
required.  
USING PROBES  
Active (FET) probes are ideal for taking high frequency mea-  
surements because they have wide bandwidth, high input  
impedance and low input capacitance. However, the probe  
ground leads provide a long ground loop that will produce er-  
rors in measurement. Instead, the probes can be grounded  
directly by removing the ground leads and probe jackets and  
using scope probe jacks.  
LM7171 Circuit Operation  
The class AB input stage in the LM7171 is fully symmetrical  
and has a similar slewing characteristic to the current feed-  
back amplifiers. In the LM7171 Simplified Schematic, Q1  
through Q4 form the equivalent of the current feedback input  
buffer, RE the equivalent of the feedback resistor, and stage  
A buffers the inverting input. The triple-buffered output stage  
isolates the gain stage from the load to provide low output  
impedance.  
COMPONENT SELECTION AND FEEDBACK RESISTOR  
It is important in high speed applications to keep all compo-  
nent leads short. For discrete components, choose carbon  
composition-type resistors and mica-type capacitors. Surface  
mount components are preferred over discrete components  
for minimum inductive effect.  
Large values of feedback resistors can couple with parasitic  
capacitance and cause undesirable effects such as ringing or  
oscillation in high speed amplifiers. For the LM7171, a feed-  
back resistor of 510Ω gives optimal performance.  
LM7171 Slew Rate Characteristic  
The slew rate of the LM7171 is determined by the current  
available to charge and discharge an internal high impedance  
node capacitor. This current is the differential input voltage  
divided by the total degeneration resistor RE. Therefore, the  
slew rate is proportional to the input voltage level, and the  
higher slew rates are achievable in the lower gain configura-  
tions. A curve of slew rate versus input voltage level is pro-  
vided in the “Typical Performance Characteristics”.  
Compensation for Input  
Capacitance  
The combination of an amplifier's input capacitance with the  
gain setting resistors, adds a pole that can cause peaking or  
oscillation. To solve this problem, a feedback capacitor with  
a value  
When a very fast large signal pulse is applied to the input of  
an amplifier, some overshoot or undershoot occurs. By plac-  
ing an external resistor such as 1 kΩ in series with the input  
of the LM7171, the bandwidth is reduced to help lower the  
overshoot.  
CF > (RG × CIN)/RF  
can be used to cancel that pole. For the LM7171, a feedback  
capacitor of 2 pF is recommended. Figure 1 illustrates the  
compensation circuit.  
Slew Rate Limitation  
If the amplifier's input signal has too large of an amplitude at  
too high of a frequency, the amplifier is said to be slew rate  
limited; this can cause ringing in time domain and peaking in  
frequency domain at the output of the amplifier.  
In the “Typical Performance Characteristics” section, there  
are several curves of AV = +2 and AV = +4 versus input signal  
levels. For the AV = +4 curves, no peaking is present and the  
LM7171 responds identically to the different input signal lev-  
els of 30 mV, 100 mV and 300 mV.  
For the AV = +2 curves, slight peaking occurs. This peaking  
at high frequency (>100 MHz) is caused by a large input signal  
at high enough frequency that exceeds the amplifier's slew  
rate. The peaking in frequency response does not limit the  
pulse response in time domain, and the LM7171 is stable with  
noise gain of +2.  
20159510  
FIGURE 1. Compensating for Input Capacitance  
17  
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Power Supply Bypassing  
Bypassing the power supply is necessary to maintain low  
power supply impedance across frequency. Both positive and  
negative power supplies should be bypassed individually by  
placing 0.01 μF ceramic capacitors directly to power supply  
pins and 2.2 μF tantalum capacitors close to the power supply  
pins.  
20159518  
FIGURE 4. Improperly Terminated Signal  
To minimize reflection, coaxial cable with matching charac-  
teristic impedance to the signal source should be used. The  
other end of the cable should be terminated with the same  
value terminator or resistor. For the commonly used cables,  
RG59 has 75Ω characteristic impedance, and RG58 has  
50Ω characteristic impedance.  
20159511  
Driving Capacitive Loads  
FIGURE 2. Power Supply Bypassing  
Amplifiers driving capacitive loads can oscillate or have ring-  
ing at the output. To eliminate oscillation or reduce ringing, an  
isolation resistor can be placed as shown below in Figure 5.  
The combination of the isolation resistor and the load capac-  
itor forms a pole to increase stability by adding more phase  
margin to the overall system. The desired performance de-  
pends on the value of the isolation resistor; the bigger the  
isolation resistor, the more damped the pulse response be-  
comes. For LM7171, a 50Ω isolation resistor is recommended  
for initial evaluation. Figure 6 shows the LM7171 driving a 150  
pF load with the 50Ω isolation resistor.  
Termination  
In high frequency applications, reflections occur if signals are  
not properly terminated. Figure 3 shows a properly terminated  
signal while Figure 4 shows an improperly terminated signal.  
20159512  
20159517  
FIGURE 5. Isolation Resistor Used  
to Drive Capacitive Load  
FIGURE 3. Properly Terminated Signal  
www.national.com  
18  
= (6.5 mA) × (30V) + (10 mA) × (15V − 10V)  
= 195 mW + 50 mW  
= 245 mW  
Application Circuit  
Fast Instrumentation Amplifier  
20159513  
FIGURE 6. The LM7171 Driving a 150 pF Load  
with a 50Ω Isolation Resistor  
Power Dissipation  
The maximum power allowed to dissipate in a device is de-  
fined as:  
20159514  
PD = (TJ(max) − TA)/θJA  
Where  
PD  
is the power dissipation in a device  
TJ(max) is the maximum junction temperature  
TA  
is the ambient temperature  
20159580  
is the thermal resistance of a particular package  
ꢀθJA  
For example, for the LM7171 in a Ceramic SOIC package, the  
maximum power dissipation at 25°C ambient temperature is  
680 mW.  
Multivibrator  
Thermal resistance, θJA, depends on parameters such as die  
size, package size and package material. The smaller the die  
size and package, the higher θJA becomes. The 8-pin DIP  
package has a lower thermal resistance (106°C/W) than that  
of the Ceramic SOIC (182°C/W). Therefore, for higher dissi-  
pation capability, use an 8-pin DIP package.  
The total power dissipated in a device can be calculated as:  
PD = PQ + PL  
PQ is the quiescent power dissipated in a device with no load  
connected at the output. PL is the power dissipated in the de-  
vice with a load connected at the output; it is not the power  
dissipated by the load.  
20159515  
Furthermore,  
PQ: = supply current × total supply voltage with no load  
PL:  
=
output current × (voltage difference between sup-  
ply voltage and output voltage of the same side of  
supply voltage)  
20159581  
For example, the total power dissipated by the LM7171 with  
VS = ±15V and output voltage of 10V into 1 kΩ is  
PD = PQ + PL  
19  
www.national.com  
Pulse Width Modulator  
20159516  
Video Line Driver  
20159521  
www.national.com  
20  
Revision History  
Released  
Revision  
Section  
Changes  
02/04/09  
A
New Release, Corporate format  
1 MDS data sheet converted into one Corp. data  
sheet format. Added ELDRS NSID's to Ordering  
Information Table. MNLM7171AM-X-RH Rev 0C0  
will be archived.  
21  
www.national.com  
Physical Dimensions inches (millimeters) unless otherwise noted  
10-Lead Ceramic Flatpack  
NS Package Number W10A  
10-Lead Ceramic SOIC  
NS Package Number WG10A  
www.national.com  
22  
8-Lead Dual-In-Line Package  
NS Package Number J08A  
23  
www.national.com  
Notes  
For more National Semiconductor product information and proven design tools, visit the following Web sites at:  
www.national.com  
Products  
www.national.com/amplifiers  
Design Support  
www.national.com/webench  
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WEBENCH® Tools  
App Notes  
Audio  
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www.national.com/timing  
www.national.com/adc  
www.national.com/interface  
www.national.com/lvds  
www.national.com/power  
www.national.com/appnotes  
www.national.com/refdesigns  
www.national.com/samples  
www.national.com/evalboards  
www.national.com/packaging  
www.national.com/quality/green  
www.national.com/contacts  
www.national.com/quality  
www.national.com/feedback  
www.national.com/easy  
Clock and Timing  
Data Converters  
Interface  
Reference Designs  
Samples  
Eval Boards  
LVDS  
Packaging  
Power Management  
Green Compliance  
Distributors  
Switching Regulators www.national.com/switchers  
LDOs  
www.national.com/ldo  
www.national.com/led  
www.national.com/vref  
www.national.com/powerwise  
Quality and Reliability  
Feedback/Support  
Design Made Easy  
Applications & Markets  
Mil/Aero  
LED Lighting  
Voltage References  
PowerWise® Solutions  
www.national.com/solutions  
www.national.com/milaero  
www.national.com/solarmagic  
www.national.com/training  
Serial Digital Interface (SDI) www.national.com/sdi  
Temperature Sensors  
PLL/VCO  
www.national.com/tempsensors SolarMagic™  
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PowerWise® Design  
University  
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