LM302 [NSC]
LM102/LM302 Voltage Followers; LM102 / LM302电压跟随器
| 型号： | LM302 |
| 厂家： | 
National Semiconductor |
| 描述： | LM102/LM302 Voltage Followers |
| 文件： | 总6页 (文件大小：195K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
November 1994
LM102/LM302 Voltage Followers
General Description
The LM102 series are high-gain operational amplifiers de-
signed specifically for unity-gain voltage follower applica-
tions. Built on a single silicon chip, the devices incorporate
advanced processing techniques to obtain very low input
current and high input impedance. Further, the input transis-
tors are operated at zero collector-base voltage to virtually
eliminate high temperature leakage currents. It can there-
fore be operated in a temperature stabilized component
oven to get extremely low input currents and low offset volt-
age drift.
quency gain error. Because of the low wiring capacitances
inherent in monolithic construction, this fast operation can
be realized without increasing power consumption.
Features
Y
Fast slewing
Ð
10V/ms
10 nA (max)
10,000 MX
Y
Y
Y
Y
Low input current
Ð
High input resistance
Ð
No external frequency compensation required
Simple offset balancing with optional 1 kX
potentiometer
The LM102, which is designed to operate with supply volt-
g
g
ages between 12V and 15V, also features low input
capacitance as well as excellent small signal and large sig-
nal frequency responseÐall of which minimize high fre-
Y
Plug-in replacement for both the LM101 and LM709 in
voltage follower applications
Schematic Diagram
TL/H/7753–1
C
1995 National Semiconductor Corporation
TL/H/7753
RRD-B30M115/Printed in U. S. A.
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
(Note 6)
Operating Free Air Temperature Range
LM102
LM302
b
b
a
55 C to 125 C
§
0 C to 70 C
§
a
§
65 C to 150 C
§
§
a
Storage Temperature Range
§
g
Supply Voltage
18V
Lead Temperature (Soldering, 10 sec.)
ESD rating to be determined.
300 C
§
Power Dissipation (Note 1)
Input Voltage (Note 2)
500 mW
g
15V
Output Short Circuit Duration (Note 3)
Indefinite
Electrical Characteristics (Note 4)
LM102
LM302
Type
5
Parameter
Conditions
Units
Min
Typ
2
Max
5
Min
Max
15
e
e
e
Input Offset Voltage
Input Bias Current
Input Resistance
Input Capacitance
T
A
T
A
T
A
25 C
§
mV
nA
X
25 C
§
3
10
10
30
10
10
12
9
12
25 C
§
10
10
10
3.0
3.0
pF
e
g
S
Large Signal Voltage
Gain
T
25 C, V
§
15V,
e
A
0.999
0.9996
0.9985
0.9995
1.0
V/V
e
g
V
10V, R
8 kX
OUT
L
e
Output Resistance
Supply Current
T
25 C
§
0.8
3.5
2.5
5.5
7.5
0.8
3.5
2.5
5.5
20
X
A
A
e
T
25 C
§
mA
mV
Input Offset Voltage
Offset Voltage
6
20
mV/ C
§
Temperature Drift
e
e
Input Bias Current
T
T
T MAX
A
3
10
3.0
20
15
50
nA
nA
A
T MIN
A
30
100
A
e
e
e
g
g
Large Signal Voltage
Gain
V
15V, V
10V,
S
OUT
0.999
R
10 kX
L
e
(Note 5)
e
g
Output Voltage
Swing
V
15V, R
10 kX
S
L
g
g
10
10
V
e
Supply Current
T
125 C
§
2.6
4.0
mA
dB
A
s
s
g
g
Supply Voltage
Rejection Ratio
12V
V
S
15V
60
60
Note 1: The maximum junction temperature of the LM102 is 150 C, while that of the LM302 is 85 C. For operating at elevated temperatures, devices in the H08
§
§
package must be derated based on a thermal resistance of 150 C/W, junction to ambient, or 20 C/W, junction to case.
§
§
Note 2: For supply voltages less than 15V, the absolute maximum input voltage is equal to the supply voltage.
g
Note 3: It is necessary to insert a resistor (at least 5k and preferably 10k) in series with the input pin when the amplifier is driven from low impedance sources to
prevent damage when the output is shorted and to ensure stability.
s
s
s
s
s
s
70 C for the LM302 unless otherwise
A
b
g
Note 4: These specifications apply for 12V
g
15V and 55 C
V
T
A
125 C for the LM102 and 0 C
§
T
§
§
§
S
specified.
Note 5: Increased output swing under load can be obtained by connecting an external resistor between the booster and Vb terminals. See curve.
Note 6: Refer to RETS102X for the LM102H military specifications.
APPLICATION HINT
The input must be driven from a source impedance of typically 10 kX (5 kX Min) to maintain stability. The total source
impedance will be reduced at high frequencies if there is stray capacitance at the input pin. In these cases, a 10 kX resistor
should be inserted in series with the input, physically close to the input pin to minimize the stray capacitance and prevent
oscillation.
2
Guaranteed Performance Characteristics LM102
Input Current
Output Swing
Supply Current
TL/H/7753–7
Typical Performance Characteristics LM102
Voltage Gain and Phase Lag
Voltage Gain and Phase Lag
Output Resistance
n
TL/H/7753–8
3
Guaranteed Performance Characteristics LM302
Input Current
Output Swing
Supply Current
TL/H/7753–9
Typical Performance Characteristics LM302
Voltage Gain and Phase Lag
Voltage Gain and Phase Lag
Output Resistance
n
TL/H/7753–10
4
Typical Applications
Low Pass Active Filter
*Values are for 10 kHz cutoff. Use sil-
vered mica capacitors for good tem-
perature stability.
TL/H/7753–3
Sample and Hold with Offset Adjustment
*Polycarbonate-dielectric capacitor.
TL/H/7753–4
High Pass Active Filter
*Values are for 100 Hz cutoff. Use
metalized polycarbonate capacitors
for good temperature stability.
TL/H/7753–5
High Input Impedance AC Amplifier
TL/H/7753–6
5
Connection Diagram
Metal Can Package
Top View
TL/H/7753–2
Order Number LM102H/883
See NS Package Number H08C
Physical Dimensions inches (millimeters)
Metal Can Package (H)
Order Number LM102H/883
NS Package Number H08C
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