LM7341MFX [NSC]

±15V, 4.6 MHz GBW, Operational Amplifier in SOT-23 Package; ± 15V , 4.6 MHz的增益带宽积,采用SOT- 23封装运算放大器
LM7341MFX
型号: LM7341MFX
厂家: National Semiconductor    National Semiconductor
描述:

±15V, 4.6 MHz GBW, Operational Amplifier in SOT-23 Package
± 15V , 4.6 MHz的增益带宽积,采用SOT- 23封装运算放大器

运算放大器
文件: 总20页 (文件大小:567K)
中文:  中文翻译
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October 13, 2008  
LM7341 Rail-to-Rail Input/Output  
±15V, 4.6 MHz GBW, Operational Amplifier in SOT-23  
Package  
General Description  
Features  
The LM7341 is a rail-to-rail input and output amplifier in a  
small SOT-23 package with a wide supply voltage and tem-  
perature range. The LM7341 has a 4.6 MHz gain bandwidth  
and a 1.9 volt per microsecond slew rate, and draws 0.75 mA  
of supply current at no load.  
(VS = ±15V, TA = 25°C, typical values.)  
Tiny 5-pin SOT-23 package saves space  
Greater than rail-to-rail input CMVR  
Rail-to-rail output swing  
Supply current  
−15.3V to 15.3V  
−14.84V to 14.86V  
0.7 mA  
The LM7341 is tested at −40°C, 125°C and 25°C with modern  
automatic test equipment. Detailed performance specifica-  
tions at 2.7V, ±5V, and ±15V and over a wide temperature  
range make the LM7341 a good choice for automotive, in-  
dustrial, and other demanding applications.  
Gain bandwidth  
4.6 MHz  
1.9 V/µs  
2.7V to 32V  
106 dB  
Slew Rate  
Wide supply range  
High power supply rejection ratio  
High common mode rejection ratio  
Excellent gain  
115 dB  
106 dB  
−40°C to 125°C  
Greater than rail-to-rail input common mode range with a  
minimum 76 dB of common mode rejection at ±15V makes  
the LM7341 a good choice for both high and low side sensing  
applications.  
Temperature range  
Tested at −40°C, 125°C and 25°C at 2.7V, ±5V and ±15V  
LM7341 performance is consistent over a wide voltage range,  
making the part useful for applications where the supply volt-  
age can change, such as automotive electrical systems and  
battery powered electronics.  
Applications  
Automotive  
Industrial robotics  
The LM7341 uses a small SOT23-5 package, which takes up  
little board space, and can be placed near signal sources to  
reduce noise pickup.  
Sensor output buffers  
Multiple voltage power supplies  
Reverse biasing of photodiodes  
Low current optocouplers  
High side sensing  
Comparator  
Battery chargers  
Test point output buffers  
Below ground current sensing  
Typical Performance Characteristics  
Open Loop Frequency Response  
Open Loop Frequency Response  
20206046  
20206047  
© 2008 National Semiconductor Corporation  
202060  
www.national.com  
Power Supply Current  
Soldering Information  
Infrared or Convection (20 sec)  
Wave Soldering Lead Temp.  
(10 sec.)  
25 mA  
235°C  
Absolute Maximum Ratings (Note 1)  
If Military/Aerospace specified devices are required,  
please contact the National Semiconductor Sales Office/  
Distributors for availability and specifications.  
260°C  
−65°C to 150°C  
150°C  
ESD Tolerance (Note 2)  
Storage Temperature Range  
Junction Temperature (Note 4)  
Human Body Model  
Machine Model  
Charge-Device Model  
VIN Differential  
2000V  
200V  
1000V  
Operating Ratings (Note 1)  
±15V  
Supply Voltage (VS = V+ − V)  
Temperature Range (Note 4)  
2.5V to 32V  
−40°C to 125°C  
Voltage at Input/Output Pin  
Supply Voltage (VS = V+ − V)  
Input Current  
(V+) + 0.3V, (V) −0.3V  
35V  
±10 mA  
±20 mA  
Package Thermal Resistance (θJA  
5-Pin SOT-23  
)
325°C/W  
Output Current(Note 3)  
2.7V Electrical Characteristics  
Unless otherwise specified, all limits guaranteed for TA = 25°C, V+ = 2.7V, V= 0V, VCM = 0.5V, VOUT = 1.35V and RL > 1 MΩ to  
1.35V. Boldface limits apply at the temperature extremes  
Symbol  
Parameter  
Conditions  
Min  
Typ  
Max  
Units  
(Note 6)  
(Note 5)  
(Note 6)  
VOS  
Input Offset Voltage  
VCM = 0.5V and VCM = 2.2V  
−4  
−5  
±0.2  
+4  
+5  
mV  
TCVOS  
IB  
Input Offset Voltage Temperature Drift  
Input Bias Current  
±2  
μV/°C  
VCM = 0.5V  
−180  
−90  
−200  
nA  
nA  
VCM = 2.2V  
30  
1
60  
70  
IOS  
Input Offset Current  
VCM = 0.5V and VCM = 2.2V  
40  
50  
CMRR  
Common Mode Rejection Ratio  
82  
80  
106  
80  
0V VCM 1.0V  
0V VCM 2.7V  
dB  
dB  
62  
60  
PSRR  
Power Supply Rejection Ratio  
86  
84  
106  
2.7V VS 30V  
VCM = 0.5V  
CMVR  
AVOL  
Common Mode Voltage Range  
Open Loop Voltage Gain  
CMRR > 60 dB  
−0.3  
3.0  
65  
0.0  
V
2.7  
12  
8
0.5V VO 2.2V  
RL = 10 kΩ to 1.35V  
V/mV  
VOUT  
Output Voltage Swing  
High  
50  
95  
120  
150  
RL = 10 kΩ to 1.35V  
VID = 100 mV  
150  
200  
RL = 2 kΩ to 1.35V  
VID = 100 mV  
mV from  
either rail  
Output Voltage Swing  
Low  
55  
120  
150  
RL = 10 kΩ to 1.35V  
VID = −100 mV  
100  
12  
150  
200  
RL = 2 kΩ to 1.35V  
VID = −100 mV  
IOUT  
Output Current  
Sourcing, VOUT = 0V  
VID = 200 mV  
6
4
mA  
Sinking, VOUT = 0V  
VID = −200 mV  
5
3
10  
IS  
Supply Current  
Slew Rate  
VCM = 0.5V and VCM = 2.2V  
0.6  
1.5  
0.9  
1.0  
mA  
SR  
±1V Step  
V/μs  
www.national.com  
2
Symbol  
Parameter  
Gain Bandwidth  
Conditions  
Min  
(Note 6)  
Typ  
(Note 5)  
Max  
(Note 6)  
Units  
GBW  
en  
3.6  
35  
MHz  
f = 100 kHz, RL = 100 kΩ  
Input Referred Voltage Noise Density  
Input Referred Voltage Noise Density  
f = 1 kHz  
nV/  
pA/  
dB  
in  
f = 1 kHz  
0.28  
THD+N  
tPD  
Total Harmonic Distortion + Noise  
Propagation Delay  
f = 10 kHz  
−66  
4
Overdrive = 50 mV (Note 7)  
Overdrive = 1V (Note 7)  
20% to 80% (Note 7)  
80% to 20% (Note 7)  
µs  
3
tr  
tf  
Rise Time  
Fall Time  
1
µs  
µs  
1
±5V Electrical Characteristics  
Unless otherwise specified, all limits guaranteed for TA = 25°C, V+ = +5V, V= −5V, VCM = VOUT = 0V and RL > 1 MΩ to 0V.  
Boldface limits apply at the temperature extremes.  
Symbol  
Parameter  
Conditions  
Min  
Typ  
Max  
Units  
(Note 6)  
(Note 5) (Note 6)  
VOS  
Input Offset Voltage  
VCM = −4.5V and VCM = 4.5V  
−4  
−5  
±0.2  
+4  
+5  
mV  
TCVOS  
IB  
Input Offset Voltage Temperature Drift  
Input Bias Current  
±2  
μV/°C  
VCM = −4.5V  
−200  
−95  
−250  
nA  
nA  
dB  
VCM = 4.5V  
35  
1
70  
80  
IOS  
Input Offset Current  
VCM = −4.5V and VCM = 4.5V  
40  
50  
CMRR  
Common Mode Rejection Ratio  
84  
82  
112  
92  
−5V VCM 3V  
72  
−5V VCM 5V  
70  
PSRR  
CMVR  
Power Supply Rejection Ratio  
Common Mode Voltage Range  
86  
84  
106  
2.7V VS 30V, VCM = −4.5V  
CMRR 65 dB  
dB  
V
−5.3  
5.3  
−5.0  
5.0  
AVOL  
Open Loop Voltage Gain  
20  
12  
110  
−4V VO 4V  
RL = 10 kΩ to 0V  
V/mV  
VOUT  
Output Voltage Swing  
High  
80  
170  
90  
150  
200  
RL = 10 kΩ to 0V,  
VID = 100 mV  
300  
400  
RL = 2 kΩ to 0V,  
VID = 100 mV  
mV from  
either rail  
Output Voltage Swing  
Low  
150  
200  
RL = 10 kΩ to 0V  
VID = −100 mV  
210  
11  
300  
400  
RL = 2 kΩ to 0V  
VID = −100 mV  
IOUT  
Output Current  
Supply Current  
Sourcing, VOUT = −5V  
VID = 200 mV  
6
4
mA  
mA  
Sinking, VOUT = 5V  
VID = −200 mV  
6
4
12  
IS  
VCM = −4.5V and VCM = 4.5V  
0.65  
1.0  
1.1  
SR  
Slew Rate  
±4V Step  
1.7  
4.0  
V/μs  
MHz  
GBW  
Gain Bandwidth  
f = 100 kHz, RL = 100 kΩ  
3
www.national.com  
Symbol  
en  
Parameter  
Conditions  
Min  
(Note 6)  
Typ  
Max  
Units  
(Note 5) (Note 6)  
Input Referred Voltage Noise Density  
Input Referred Voltage Noise Density  
f = 1 kHz  
f = 1 kHz  
33  
nV/  
pA/  
dB  
in  
0.26  
THD+N  
tPD  
Total Harmonic Distortion + Noise  
Propagation Delay  
f = 10 kHz  
−66  
8
Overdrive = 50 mV (Note 7)  
Overdrive = 1V (Note 7)  
20% to 80% (Note 7)  
80% to 20% (Note 7)  
µs  
6
tr  
tf  
Rise Time  
Fall Time  
5
µs  
µs  
5
±15V Electrical Characteristics  
Unless otherwise specified, all limits guaranteed for TA = 25°C, V+ = 15V, V= −15V, VCM = VOUT = 0V and RL > 1 MΩ to 0V.  
Boldface limits apply at the temperature extremes  
Symbol  
Parameter  
Conditions  
Min  
Typ  
Max  
Units  
(Note 6)  
(Note 5)  
(Note 6)  
VOS  
Input Offset Voltage  
VCM = −14.5V and VCM = 14.5V  
−4  
−5  
±0.2  
+4  
+5  
mV  
TCVOS  
IB  
Input Offset Voltage Temperature Drift  
Input Bias Current  
±2  
μV/°C  
VCM = −14.5V  
−250  
−110  
−300  
nA  
nA  
dB  
VCM = 14.5V  
40  
1
80  
90  
IOS  
Input Offset Current  
VCM = −14.5V and VCM = 14.5V  
40  
50  
CMRR  
Common Mode Rejection Ratio  
84  
82  
115  
100  
106  
−15V VCM 12V  
−15V VCM 15V  
78  
76  
PSRR  
CMVR  
Power Supply Rejection Ratio  
Common Mode Voltage Range  
86  
84  
2.7V VS 30V, VCM = −14.5V  
dB  
V
CMRR > 80 dB  
−15.3  
15.3  
200  
−15.0  
15.0  
AVOL  
Open Loop Voltage Gain  
25  
15  
−13V VO 13V  
RL = 10 kΩ to 0V  
V/mV  
VOUT  
Output Voltage Swing  
High  
135  
160  
10  
300  
400  
RL = 10 kΩ to 0V  
VID = 100 mV  
mV from  
either rail  
Output Voltage Swing  
Low  
300  
400  
RL = 10 kΩ to 0V  
VID = −100 mV  
IOUT  
Output Current  
(Note 4)  
Sourcing, VOUT = −15V  
VID = 200 mV  
5
3
mA  
mA  
Sinking, VOUT = 15V  
VID = −200 mV  
8
5
13  
IS  
Supply Current  
VCM = −14.5V and VCM = 14.5V  
0.7  
1.2  
1.3  
SR  
Slew Rate  
±12V Step  
1.9  
4.6  
31  
V/μs  
MHz  
GBW  
en  
Gain Bandwidth  
f = 100 kHz, RL = 100 kΩ  
f = 1 kHz  
Input Referred Voltage Noise Density  
nV/  
in  
Input Referred Voltage Noise Density  
f = 1 kHz  
0.27  
pA/  
dB  
THD+N  
tPD  
Total Harmonic Distortion + Noise  
Propagation Delay  
f = 10 kHz  
−65  
17  
Overdrive = 50 mV (Note 7)  
Overdrive = 1V (Note 7)  
µs  
12  
www.national.com  
4
Symbol  
Parameter  
Conditions  
Min  
Typ  
Max  
Units  
(Note 6)  
(Note 5)  
(Note 6)  
tr  
tf  
Rise Time  
Fall Time  
20% to 80% (Note 7)  
80% to 20% (Note 7)  
13  
13  
µs  
µs  
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, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC)  
Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC).  
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), θJA. The maximum allowable power dissipation at any ambient temperature is  
PD = (TJ(MAX) − TA)/θJA. All numbers apply for packages soldered directly unto a PC board.  
Note 5: Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary over time and will  
also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material.  
Note 6: All limits are guaranteed by testing or statistical analysis.  
Note 7: The maximum differential voltage between the input pins is VIN Differential = ±15V.  
Connection Diagram  
5-Pin SOT-23  
20206002  
Top View  
Ordering Information  
Package  
Part Number  
LM7341MF  
Package Marking  
Transport Media  
1k Units Tape and Reel  
250 Units Tape and Reel  
3k Units Tape and Reel  
NSC Drawing  
5-Pin SOT-23  
LM7341MFE  
LM7341MFX  
AV4A  
MF05A  
5
www.national.com  
Typical Performance Characteristics  
Output Swing vs. Sourcing Current  
Output Swing vs. Sinking Current  
Output Swing vs. Sinking Current  
Output Swing vs. Sinking Current  
20206030  
20206033  
20206034  
20206035  
Output Swing vs. Sourcing Current  
20206031  
Output Swing vs. Sourcing Current  
20206032  
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6
VOS Distribution  
VOS vs. VCM (Unit 1)  
20206040  
20206003  
VOS vs. VCM (Unit 2)  
VOS vs. VCM (Unit 3)  
20206004  
20206008  
VOS vs. VCM (Unit 1)  
VOS vs. VCM (Unit 2)  
20206006  
20206007  
7
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VOS vs. VCM (Unit 3)  
VOS vs. VCM (Unit 1)  
20206011  
20206010  
VOS vs. VCM (Unit 2)  
VOS vs. VCM (Unit 3)  
20206005  
20206009  
VOS vs. VS (Unit 1)  
VOS vs. VS (Unit 2)  
20206012  
20206013  
www.national.com  
8
VOS vs. VS (Unit 3)  
VOS vs. VS (Unit 2)  
IBIAS vs. VCM  
VOS vs. VS (Unit 1)  
VOS vs. VS (Unit 3)  
IBIAS vs. VCM  
20206014  
20206015  
20206017  
20206019  
20206016  
20206018  
9
www.national.com  
IBIAS vs. VCM  
IBIAS vs. VS  
IS vs. VCM  
IBIAS vs. VS  
IS vs. VCM  
IS vs. VCM  
20206020  
20206021  
20206024  
20206025  
20206026  
20206027  
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10  
IS vs. VCM  
IS vs. VCM  
20206029  
20206028  
Positive Output Swing vs. Supply Voltage  
Positive Output Swing vs. Supply Voltage  
20206036  
20206037  
Negative Output Swing vs. Supply Voltage  
Negative Output Swing vs. Supply Voltage  
20206039  
20206038  
11  
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Open Loop Frequency with Various Capacitive Load  
Open Loop Frequency with Various Resistive Load  
20206044  
20206045  
Open Loop Frequency with Various Supply Voltage  
Open Loop Frequency Response with Various Temperatures  
20206046  
20206047  
CMRR vs. Frequency  
+PSRR vs. Frequency  
20206043  
20206041  
www.national.com  
12  
-PSRR vs. Frequency  
Small Signal Step Response  
20206051  
20206042  
Large Signal Step Response  
Input Referred Noise Density vs. Frequency  
20206052  
20206048  
Input Referred Noise Density vs. Frequency  
Input Referred Noise Density vs. Frequency  
20206049  
20206050  
13  
www.national.com  
THD+N vs. Frequency  
20206053  
SPECIFIC ADVANTAGES OF 5-Pin SOT-23 (TinyPak)  
Application Information  
The obvious advantage of the 5-pin SOT-23, TinyPak, is that  
it can save board space, a critical aspect of any portable or  
miniaturized system design. The need to decrease overall  
system size is inherent in any handheld, portable, or  
lightweight system application.  
GENERAL INFORMATION  
Low supply current and wide bandwidth, greater than rail-to-  
rail input range, full rail-to-rail output, good capacitive load  
driving ability, wide supply voltage and low distortion all make  
the LM7341 ideal for many diverse applications.  
Furthermore, the low profile can help in height limited designs,  
such as consumer hand-held remote controls, sub-notebook  
computers, and PCMCIA cards.  
The high common-mode rejection ratio and full rail-to-rail in-  
put range provides precision performance when operated in  
non-inverting applications where the common-mode error is  
added directly to the other system errors.  
An additional advantage of the tiny package is that it allows  
better system performance due to ease of package place-  
ment. Because the tiny package is so small, it can fit on the  
board right where the op amp needs to be placed for optimal  
performance, unconstrained by the usual space limitations.  
This optimal placement of the tiny package allows for many  
system enhancements, not easily achieved with the con-  
straints of a larger package. For example, problems such as  
system noise due to undesired pickup of digital signals can  
be easily reduced or mitigated. This pick-up problem is often  
caused by long wires in the board layout going to or from an  
op amp. By placing the tiny package closer to the signal  
source and allowing the LM7341 output to drive the long wire,  
the signal becomes less sensitive to such pick-up. An overall  
reduction of system noise results.  
CAPACITIVE LOAD DRIVING  
The LM7341 has the ability to drive large capacitive loads. For  
example, 1000 pF only reduces the phase margin to about 30  
degrees.  
POWER DISSIPATION  
Although the LM7341 has internal output current limiting,  
shorting the output to ground when operating on a +30V pow-  
er supply will cause the op amp to dissipate about 350 mW.  
This is a worst-case example. In the 5-pin SOT-23 package,  
the higher thermal resistance will cause a calculated rise of  
113°C. This can raise the junction temperature to above the  
absolute maximum temperature of 150°C.  
Often times system designers try to save space by using dual  
or quad op amps in their board layouts. This causes a com-  
plicated board layout due to the requirement of routing several  
signals to and from the same place on the board. Using the  
tiny op amp eliminates this problem.  
Operating from split supplies greatly reduces the power dis-  
sipated when the output is shorted. Operating on ±15V sup-  
plies can only cause a temperature rise of 57°C in the 5-pin  
SOT-23 package, assuming the short is to ground.  
Additional space savings parts are available in tiny packages  
from National Semiconductor, including low power amplifiers,  
precision voltage references, and voltage regulators.  
WIDE SUPPLY RANGE  
The high power-supply rejection ratio (PSRR) and common  
mode rejection ratio (CMRR) provide precision performance  
when operated on battery or other unregulated supplies. This  
advantage is further enhanced by the very wide supply range  
(2.5V–32V) offered by the LM7341. In situations where highly  
variable or unregulated supplies are present, the excellent  
PSRR and wide supply range of the LM7341 benefit the sys-  
tem designer with continued precision performance, even in  
such adverse supply conditions.  
LOW DISTORTION, HIGH OUTPUT DRIVE CAPABILITY  
The LM7341 offers superior low-distortion performance, with  
a total-harmonic-distortion-plus-noise of −66 dB at f = 10 kHz.  
The advantage offered by the LM7341 is its low distortion  
levels, even at high output current and low load resistance.  
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14  
Typical Applications  
HANDHELD REMOTE CONTROLS  
The LM7341 offers outstanding specifications for applications  
requiring good speed/power trade-off. In applications such as  
remote control operation, where high bandwidth and low pow-  
er consumption are needed. The LM7341 performance can  
easily meet these requirements.  
OPTICAL LINE ISOLATION FOR MODEMS  
The combination of the low distortion and good load driving  
capabilities of the LM7341 make it an excellent choice for  
driving opto-coupler circuits to achieve line isolation for  
modems. This technique prevents telephone line noise from  
coupling onto the modem signal. Superior isolation is  
achieved by coupling the signal optically from the computer  
modem to the telephone lines; however, this also requires a  
low distortion at relatively high currents. Due to its low distor-  
tion at high output drive currents, the LM7341 fulfills this need,  
in this and in other telecom applications.  
20206054  
FIGURE 1. Inverting Comparator  
Similarly a non-inverting comparator at VS = 30V and 1V of  
overdrive there is typically 12 µs of propagation delay. At  
VS = 30V and 50 mV of overdrive there is typically 17 μs of  
propagation delay.  
REMOTE MICROPHONE IN PERSONAL COMPUTERS  
Remote microphones in Personal Computers often utilize a  
microphone at the top of the monitor which must drive a long  
cable in a high noise environment. One method often used to  
reduce the nose is to lower the signal impedance, which re-  
duces the noise pickup. In this configuration, the amplifier  
usually requires 30 dB–40 dB of gain, at bandwidths higher  
than most low-power CMOS parts can achieve. The LM7341  
offers the tiny package, higher bandwidths, and greater out-  
put drive capability than other rail-to-rail input/output parts can  
provide for this application.  
20206055  
LM7341 AS A COMPARATOR  
FIGURE 2. Non-Inverting Comparator  
The LM7341 can also be used as a comparator and provides  
quite reasonable performance. Note however that unlike a  
typical comparator an op amp has a maximum allowed dif-  
ferential voltage between the input pins. For the LM7341, as  
stated in the Absolute Maximum Ratings section, this maxi-  
mum voltage is VIN Differential = ±15V. Beyond this limit, even  
for a short time, damage to the device may occur.  
COMPARATOR WITH HYSTERESIS  
The basic comparator configuration may oscillate or produce  
a noisy output if the applied differential input voltage is near  
the comparator's offset voltage. This usually happens when  
the input signal is moving very slowly across the comparator's  
switching threshold. This problem can be prevented by the  
addition of hysteresis or positive feedback.  
As an inverting comparator at VS = 30V and 1V of overdrive  
there is typically 12 μs of propagation delay. At VS = 30V and  
50 mV of overdrive there is typically 17 µs of propagation de-  
lay.  
15  
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INVERTING COMPARATOR WITH HYSTERESIS  
sistors can be presented as R2||R3 in series with R1. The  
upper trip voltage VA2 is defined as  
The inverting comparator with hysteresis requires a three re-  
sistor network that is referenced to the supply voltage VCC of  
the comparator, as shown in Figure 3. When VIN at the in-  
verting input is less than VA, the voltage at the non-inverting  
node of the comparator (VIN < VA), the output voltage is high  
(for simplicity assume VOUT switches as high as VCC). The  
three network resistors can be represented as R1||R3 in series  
with R2. The lower input trip voltage VA1 is defined as  
VA2 = VCC (R2||R3) / ((R1+ (R2||R3)  
The total hysteresis provided by the network is defined as  
Delta VA = VA1- VA2  
For example to achieve 50 mV of hysteresis when VCC = 30V  
set R1 = 4.02 k, R2 = 4.02 k, and R3 = 1.21 M. With these  
resistors selected the error due to input bias current is ap-  
proximately 1 mV. To minimize this error it is best to use low  
resistor values on the inputs.  
VA1 = VCCR2 / ((R1||R3) + R2)  
When VIN is greater than VA (VIN > VA), the output voltage is  
low, very close to ground. In this case the three network re-  
20206056  
FIGURE 3. Inverting Comparator with Hysteresis  
www.national.com  
16  
NON-INVERTING COMPARATOR WITH HYSTERESIS  
VIN2 = (VREF (R1+ R2) - VCCR1)/R2  
A non-inverting comparator with hysteresis requires a two re-  
sistor network, and a voltage reference (VREF) at the inverting  
input. When VIN is low, the output is also low. For the output  
to switch from low to high, VIN must rise up to VIN1 where  
VIN1 is calculated by  
The hysteresis of this circuit is the difference between VIN1  
and VIN2  
.
Delta VIN = VCCR1/R2  
For example to achieve 50 mV of hysteresis when VCC = 30V  
set R1 = 20Ω and R2 = 12.1 kΩ.  
VIN1 = R1*(VREF/R2) + VREF  
When VIN is high, the output is also high, to make the com-  
parator switch back to it's low state, VIN must equal VREF  
before VA will again equal VREF . VIN can be calculated by  
20206057  
20206058  
FIGURE 4. Non-Inverting Comparator with Hysteresis  
OTHER SOT-23 AMPLIFIERS  
SMALLER SC70 AMPLIFIERS  
The LM7321 is a rail-to-rail input and output amplifier that can  
tolerate unlimited capacitive load. It works from 2.7V to ±15V  
and across the −40°C to 125°C temperature range. It has 20  
MHz gain-bandwidth, and is available in both 5-Pin SOT-23  
and 8-Pin SOIC packages.  
The LMV641 is a 10 MHz amplifier which uses only 140 micro  
amps of supply current. The input voltage offset is less than  
0.5 mV.  
The LMV851 is an 8 MHz amplifier which uses only 0.4 mA  
supply current, and is available in the smaller SC70 package.  
The LMV851 also resists Electro Magnetic Interference (EMI)  
from mobile phones and similar high frequency sources. It  
works on 2.7V to 5.5 V supplies.  
The LM6211 is a 20 MHz part with CMOS input, which runs  
on 5V to 24V single supplies. It has rail-to-rail output and low  
noise.  
The LMP7701 is a rail-to-rail input and output precision part  
with an input voltage offset under 220 microvolts and low  
noise. It has 2.5 MHz bandwidth and works on 2.7V to 12V  
supplies.  
Detailed information on these and a wide range of other parts  
can be found at www.national.com.  
17  
www.national.com  
Physical Dimensions inches (millimeters) unless otherwise noted  
5-Pin SOT-23  
NS Package Number MF05A  
www.national.com  
18  
Notes  
19  
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Notes  
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