LF155 - LF255 - LF355
LF156 - LF256 - LF356
LF157 - LF257 - LF357
WIDE BANDWIDTH
SINGLE J-FET OPERATIONAL AMPLIFIERS
.
.
.
.
..
..
..
.
HIGH INPUT IMPEDANCE J-FET
INPUT STAGE
HIGH SPEED J-FET OP-AMPs : UP to 20MHz,
50V/µs
OFFSET VOLTAGE ADJUST DOES NOT
DEGRADE DRIFT OR COMMON-MODE
REJECTION AS IN MOST MONOLITHIC
AMPLIFIERS
INTERNAL COMPENSATION AND LARGE
DIFFERENTIAL INPUT VOLTAGECAPABILITY
(UP TO VCC+)
N
DIP8
(Plastic Package)
D
SO8
(Plastic Micropackage)
TYPICAL APPLICATIONS
PRECISION HIGH SPEED INTEGRATORS
FAST D/A AND A/D CONVERTERS
HIGH IMPEDANCE BUFFERS
WIDEBAND, LOW NOISE, LOW DRIFT
AMPLIFIERS
LOGARITHMIC AMPLIFIERS
PHOTOCELL AMPLIFIERS
SAMPLE AND HOLD CIRCUITS
ORDER CODES
Temperature
Range
Part Number
LF355, LF356, LF357
LF255, LF256, LF257
LF155, LF156, LF157
Example : LF355N
o
o
0 C, +70 C
-40oC, +105oC
o
o
-55 C, +125 C
Package
N
D
•
•
•
•
•
•
PIN CONNECTIONS (top view)
1
DESCRIPTION
These circuits are monolithic J–FET input operational
amplifiers incorporating well matched, high voltage
J–FET on the same chip with standard bipolar
transistors.
This amplifiers feature low input bias and offset
currents, low input offset voltage and input offset
voltage drift, coupled with offset adjust which does not
degrade drift or common-mode rejection.
The devices are also designed for high slew rate, wide
bandwidth,extremelyfastsettlingtime, lowvoltageand
current noise and a low l/f noise corner.
November 1995
8
2
-
7
3
+
6
5
4
1
2
3
4
-
Offset null 1
Inverting input
Non-inverting input
VCC
5
6
7
8
-
Offset null 2
Output
VCC+
N.C.
1/14
LF155 - LF156 - LF157
SCHEMATIC DIAGRAM
VCC
Q1
J3
Q2
D2
C2
10pF
Q4
Offset
N2
Q3
Offset
N1
Q5
R1
25Ω
D1
J8
Non-inverting
input
J7
Output
VCC
J1 J2
J5
Q6
Inverting
D3
Q9
input
J4
Q7 Q8
VCC
J9
R2
R3
30Ω
30Ω
Q10
Q14
Q11
Q12
Q15
C1
10pF
Q13
D5
D6
R4
1k Ω
R5
4kΩ
R6
4kΩ
R7
1.9kΩ
D4
R8
25Ω
J11
J10
VCC
V i o ADJUSTMENT
V CC +
N1
-
N2
25k Ω
LF155/6/ 7
V CC -
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
Supply Voltage
±22
V
Vi
Input Voltage - (note 1)
±20
V
Vid
Differential Input Voltage
±40
V
Ptot
Power Dissipation
570
mW
VCC
Output Short-circuit Duration
Toper
Operating Free Air Temperature Range
Tstg
Storage Temperature Range
2/14
Infinite
LF155-LF156-LF157
LF255-LF256-LF257
LF355-LF356-LF357
–55 to +125
–40 to +105
0 to +70
o
–65 to 150
o
C
C
LF155 - LF156 - LF157
ELECTRICAL CHARACTERISTICS
LF155, LF156, LF157
-55oC ≤ Tamb ≤ +125oC
LF255, LF256, LF257
-40oC ≤ Tamb ≤ +105oC
(unless otherwise specified)
Symbol
Vio
Iio
Iib
Avd
SVR
ICC
DVio
DV io/Vio
Vicm
CMR
±VOPP
GBP
SR
Ri
Ci
en
in
ts
±15V ≤ VCC ≤ ±20V
±15V ≤ VCC ≤ ±20V
LF155 - LF156 - LF157
LF255 - LF256 - LF257
Min.
Typ.
Max.
Parameter
Input Offset Voltage (RS = 50Ω)
Tamb = +25oC
Tmin. ≤ Tamb ≤ Tmax.
Unit
mV
3
5
7
6.5
3
20
20
1
pA
nA
nA
20
100
50
5
pA
nA
nA
V/mV
LF155, LF156, LF157
LF255, LF256, LF257
Input Offset Current - (note 3)
o
Tamb = +25 C
Tmin. ≤ Tamb ≤ Tmax.
LF155, LF156, LF157
LF255, LF256, LF257
Input Bias Current - (note 3)
Tamb = 25oC
Tmin. ≤ Tamb ≤ Tmax.
LF155, LF156, LF157
LF255, LF256, LF257
Large Signal Voltage Gain (R L = 2kΩ, Vo = ±10V, VCC = ±15V)
o
Tamb =+ 25 C
Tmin. ≤ Tamb ≤ Tmax.
Supply Voltage Rejection Ratio - (note 4)
Supply Current, (VCC = ±15V, no load)
LF155, LF255
Tamb =+ 25oC
LF156, LF256
LF157, LF257
Input Offset Voltage Drift (RS = 50Ω)
Change in Average Temperature Coefficient with VIO adjust
(RS = 50Ω) - (note 2)
Input Common Mode Voltage Range (VCC = ±15V, Tamb = 25oC)
Common Mode Rejection Ratio
Output Voltage Swing (VCC = ±15V)
RL = 10kΩ
RL = 2kΩ
Gain Bandwidth Product (V CC = ±15V, Tamb = 25oC)
LF155, LF255
LF156, LF256
LF157, LF257
Slew Rate (V CC = ±15V, Tamb = 25oC)
LF155, LF255
AV = 1
LF156, LF256
LF157, LF257
AV = 5
Input Resistance (Tamb = +25oC)
Input Capacitance (VCC = ±15V, Tamb = 25oC)
Equivalent Input Noise Voltage (VCC = ±15V, Tamb = 25oC, RS = 100Ω)
f = 1000Hz
LF155, LF255
LF156, LF256
LF157, LF257
f = 100Hz
LF155, LF255
LF156, LF256
LF157, LF257
Equivalent Input Noise Current
o
(VCC = ±15V, Tamb = 25 C, f = 100Hz or f = 1000Hz)
50
25
85
200
100
2
5
5
5
0.5
±11
85
+15.1
-12
100
±12
±10
±13
±12
4
7
7
o
µV/ C
o
µV/ C
per mV
V
dB
V
MHz
2.5
5
20
V/µs
7.5
30
5
12
50
1012
3
20
12
12
25
15
15
0.01
o
Settling Time (VCC = ±15V, Tamb = 25 C) - (note 5)
LF155, LF255
LF156, LF256
LF157, LF257
dB
mA
4
1.5
1.5
Ω
pF
nV

√
Hz
pA
√

Hz
µs
3/14
LF155 - LF156 - LF157
ELECTRICAL CHARACTERISTICS
LF355, LF356, LF357
0oC ≤ Tamb ≤ +70oC
(unless otherwise specified)
Symbol
Vio
Iio
Iib
Avd
SVR
ICC
DVio
DV io/Vio
Vicm
CMR
±VOPP
GBP
SR
Ri
Ci
en
in
ts
LF355 - LF356 - LF357
Min.
Typ.
Max.
Parameter
Input Offset Voltage (RS = 50Ω)
o
Tamb = +25 C
Tmin. ≤ Tamb ≤ Tmax.
Input Offset Current - (note 3)
Tamb = +25oC
Tmin. ≤ Tamb ≤ Tmax.
Input Bias Current - (note 3)
o
Tamb = 25 C
Tmin. ≤ Tamb ≤ Tmax.
Large Signal Voltage Gain (R L = 2kΩ, Vo = ±10V)
o
Tamb =+ 25 C
Tmin. ≤ Tamb ≤ Tmax.
Supply Voltage Rejection Ratio - (note 4)
Supply Current, no Load
LF355
Tamb = 25oC
LF356, LF357
Input Offset Voltage Drift (RS = 50Ω) - (note 2)
Change in Average Temperature Coefficient with VIO adjust
(RS = 50Ω)
o
Input Common Mode Voltage Range (Tamb = 25 C)
Common Mode Rejection Ratio
Output Voltage Swing
Gain Bandwidth Product (Tamb = 25oC)
Slew Rate (Tamb = 25oC)
AV = 1
RL = 10kΩ
RL = 2kΩ
LF355
LF356
LF357
o
Unit
mV
25
15
80
3
10
13
3
50
2
pA
nA
20
200
8
pA
nA
V/mV
200
100
2
5
5
±10
80
±12
±10
0.5
+15.1
-12
100
±13
±12
2.5
5
20
dB
mA
4
10
o
µV/ C
o
µV/ C
per mV
V
dB
V
MHz
V/µs
LF355
LF356
LF357
AV = 5
o
Input Resistance (Tamb = +25 C)
Input Capacitance (Tamb = 25oC)
Equivalent Input Noise Voltage (Tamb = 25oC, R S = 100Ω)
f = 1000Hz
LF355
LF356, LF357
f = 100Hz
LF355
LF356, LF357
Equivalent Input Noise Current
(Tamb = 25oC, f = 100Hz or f = 1000Hz)
Settling Time (Tamb = 25 C) - (note 5)
VCC = ±15V
LF355
LF356, LF357
5
12
50
12
10
3
20
12
25
15
0.01
4
1.5
Ω
pF
nV

√
Hz
pA
√

Hz
µs
Notes : 1. Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage.
2. The temperature coefficient of the adjusted input offset voltage changes only a small amount (0.5µV/oC typically) for each mV of
adjustment from its original unadjusted value. Common-mode rejection and open loop voltage gain are also unaffected by offset
adjustment.
3. The inputbias currents are junction leakage currents which approximately double for every 10oC increase in the junction temperature
Tamb. Due to limited production test time, the input bias current measured is correlated to junction temperature.
In a normal operation the junction temperature rises above the ambient temperature as a result of internal power dissipation,
Ptot-Tamb = Tamb + Rth(j-a) x Ptot where Rth(j-a)is the thermal resistance from junction to ambient. Use of a heatsink is recommended if
input currents are to be kept to a minimum.
4. Supply voltage rejection is measured for bothsupply magnitudes increasing or decreasing simultaneously, in accordance with common practise.
5. Settling time is defined here, for a unity gain inverter connection using 2kΩ resistors for the LF155, LF156 series. It is the time
required for the error voltage (the voltage at the inverting input pin on the amplifier) to settle to within 0.01% of its final value from
the time a 10V step input is applied to the inverter. For the LF157 series AV = -5, the feedback resistor from output to input is 2kΩ
and the output step is 10V.
4/14
LF155 - LF156 - LF157
APPLICATION HINTS
The LF155, LF156, LF157 series are op amps with JFETinput transistors.TheseJFETs havelarge reverse
breakdown voltagesfromgateto source or drain eliminatingthe need of clamps across the inputs. Therefore
large differential input voltages can easily be accommodatedwithouta large increaseofinputcurrents. The
maximum differential input voltage is independent of
the supply voltage.However,neitherofthenegative input voltages should be allowed to exceedthe negative
supply as this will cause large currents to flow which
can result in a destroyed unit.
Exceeding the negative common-mode limit on either
inputwillcausea reversalof thephaseto theoutputand
force the amplifier output to the correspondinghigh or
low state. Exceedingthe negativecommon-mode limit
on both inputs will force the amplifier output to a high
state. In neither case does a latch occur since raising
the input back within the common-mode range again
puts the input stage and thus the amplifier in a normal
operating mode.
Exceedingthe positive common-modelimit on a single
input will not changethe phase of the output however,
if bothinputsexceedthe limit, theoutputof theamplifier
will be forced to a high state.
These amplifiers will operate with the common-mode
input voltage equal to the positive supply. In fact, the
common-modevoltagecanexceedthepositivesupply
by approximately 100 mV independentof supply voltage and overthefulloperatingtemperaturerange.The
positive suplly can thereforebe used as a referenceon
an input as, for example, in a supply current monitor
and/or limiter.
Precautionsshould be taken to ensure that the power
supply for the integrated circuit never becomes re-
versed in polarity or that the unit is not inadvertentlyinstalled backwards in a socket as an unilimited current
surge throughthe resulting forward diode within the IC
couldcausefusingof theinternalconductorsandresult
in a destroyed unit.
Because these amplifiers are JFET rather than MOSFET input op amps they do not require special handling.
Allof thebiascurrentsintheseamplifiersareset by FET
current sources. The drain currents for the amplifiers
are therefore essentially independent of supply voltages.
As with most amplifiers, care should betaken with lead
dress, components placement and supply decoupling
in order to ensure stability. For example, resistors from
the output to an input should be placed with the body
close to theinputto minimiz ”pickup” andmaximize the
frequency of the feedback pole by minimizing the capacitancefrom the input to ground.
A feedback pole is createdwhen the feedbackaround
any amplifier is resistive. The parallel resistance and
capacitancefromthe input of thedevice(usually the invertinginput)toacgroundset thefrequencyof thepole.
In many instances the frequency of this pole is much
greaterthanthe expected3 dB frequencyof the closed
loopgain and consequentlythereis negligible effecton
stability margin. However, if the feedback pole is less
than approximately six time the expected 3 dB frequencya leadcapacitorshouldbeplacedfrom theoutput to the input of the op amp. The value of that added
capacitor should be such that the RC time constant of
this capacitor and the resistance it parallels is greater
than or equal to the original feedback pole time constant.
5/14
LF155 - LF156 - LF157
TYPICAL CIRCUITS
LARGE POWER BW AMPLIFIER
SETTLING TIME TEST CIRCUIT
2kΩ
+15V
*400 Ω
2k Ω
10k Ω
eI
-1V
1k Ω
VCC+
-
RI
LF155/6/7
0V
100pF
5k Ω
*1k Ω
eO
LF157
-
eI
10V
2N 4416
eo
3k Ω
-15V
+1V
5k Ω
+10V
VCC-
Oscilloscope
-10V
+15V
2N 4416
2k Ω
For distortion < 1% and a 20 VPP VO swing, power bandwidth
is : 500kHz.
6/14
Settling time is tested with the LF155, LF156 connected as
unity gain converter RI = 2kΩ and LF157 connected for AV = -5,
RI = 0.4kΩ
LF155 - LF156 - LF157
INPUT BIAS CURRENT
10k
1k
VCC
VCC
VCC
VCC
100
=
=
=
=
INPUT BIAS CURRENT
100k
INPUT BIAS CURRENT (pA)
INPUT BIAS CURRENT (pA)
100k
–20V
–15V
–10V
–5V
10
1
LF155
10k
1k
VCC
VCC
VCC
VCC
100
0.1
10
1
LF156, LF157
-25
5
35
95
65
125
-55
CASE TEMPE RATURE ( C)
60
50
40
LF156, LF157
With he a tsink
30
LF155
Fre e-a ir
20
10
LF155 with hea tsink
0 -10
-5
0
5
10
PEAK -TO - PEAK OUTPUT SWING (V)
VCC = – 15V
Tamb = +25 C
R L = 50kΩ
LF156, LF157
F re e -a ir
70
-25
5
35
95
65
125
CASE TEMPE RATURE ( C)
INPUT BIAS CURRENT
80
INPUT BIAS CURRENT (pA)
–20V
–15V
–10V
–5V
0.1
-55
VOLTAGE S WING
40
RL
= 2k W
Ta mb = +25 c
30
20
10
0
0
COMMON-MODE VOLTAGE (V)
5
10
15
20
S UP P LY VOLTAGE (–V)
S UP P LY CURRENT
S UP P LY CURRENT
4
7
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
=
=
=
=
3
T ca
- 55
se =
C
C
+2 5
se =
T ca
C
+1 2 5
se =
T ca
2
6
T
=
se
ca
5
Tc
4
T
0
5
10
15
20
S UP P LY VOLTAGE (–V)
25
5
C
=+
se
+
e=
ca s
25
12
C
5C
3
LF156, LF157
LF155
1
a
-
2
0
5
10
15
20
25
S UP P LY VOLTAGE (–V)
7/14
LF155 - LF156 - LF157
SMALL SIGNAL PULSE RESPONSE
TIME (0.5µs/DIV)
SMALL SIGNAL PULSE RESPONSE
TIME (0.5µs/DIV)
8/14
SMALL SIGNAL PULSE RESPONSE
TIME (1µs/DIV)
SMALL SIGNAL PULSE RESPONSE
TIME (1µs/DIV)
SMALL SIGNAL PULSE RESPONSE
SMALL SIGNAL PULSE RESPONSE
TIME (0.1µs/DIV)
TIME (0.5µs/DIV)
VCC = – 15V
Ta
m
-10
5
C
0
10
5
15
20
25
30
35
5
0
0
10
15
20
25
30
40
35
OUTPUT SOURCE CURRENT (mA)
MAXIMUM POS ITIVE COMMON-MODE
INPUT VOLTAGE
MAXIMUM NEGATIVE COMMON-MODE
INPUT VOLTAGE
Tamb
POSITIVE COMMON-MODE
INPPPUT VOLTAGE LIMIT(V)
-20
-55 C
+125 C
15
10
5
5
-15
Tamb = +125 C
-5
0
10
15
20
-5
PEAK -TO-PEAK OUTPUT SWING (V)
OP EN LOOP VOLTAGE GAIN
R L = 2kΩ
R s = 50 Ω
Ta mb = -55 C
10 6
Ta m b = +25 C
10 5
Ta mb = +125 C
10 4
10
15
SUP P LY VOLTAGE (–V)
-10
-15
-20
NEGATIVE SUPP LY VOLTAGE (V)
10 7
5
Tamb = 55 C
Tamb = + 25 C
-10
P OS ITIVE S UP P LY VOLTAGE (V)
OPEN LOOP VOLTAGE GAIN (V)
5
OUTP UT S INK CURRENT (mA)
20
POSITIVE COMMON-MODE
INPPPUT VOLTAGE LIMIT(V)
10
25 C
aT m b = +
C
0
VCC = – 15V
aT mb = +12 5 C
5
+2
b=
Tamb = +125 C
-5
b=
5-
MAXIMUM POSITIVE CURRENT
15
Tamb = - 55 C
Tam
NEGATIVE OUTPUT VOLTAGE SWING (V)
MAXIMUM NEGATIVE CURRENT
-15
POSITIVE OUTPUT VOLTAGE SWING (V)
LF155 - LF156 - LF157
20
OUTPUT VOLTAGE S WING
28
24
VCC = +15V
Ta mb = +25 C
20
18
12
8
0
0
10 0
10 1
OUTPUT LOAD R L (kΩ)
9/14
UNITY GAIN BANDWIDTH PRODUCT (MHz)
GAIN BANDWIDTH PRODUCT (MHz)
LF155 - LF156 - LF157
GAIN BANDWIDTH PRODUCT
5
LF155
4
VCC = – 10 V
VCC = – 15 V
VCC = – 20 V
3
2
1
-55
-15
25
65
105
AMBIENT TEMPERATURE ( C)
GAIN BANDWIDTH PRODUCT
LF157 curve s ide ntical but X 4
7
6
VCC = – 20 V
4
-55
1
LF155
0.8
0.6
0.4
0.2
0
-55
-15
INVERTE R S ETTLING TIME
OUTPUT VOLTAGE SWING
FROM 0 V (V)
5
10mV
-5
-10
1mV
LF156, AV = -1
LF157, AV = -5
0
10 -1
1mV
10 0
SETTLING TIME (µs )
105
1mV
5
10mV
0
LF155
-5
1mV
10mV
5
0.5
10 0
SE TTLING TIME (µs )
10 1
OP EN LOOP FREQUENCY RESP ONSE
Tamb = + 25 C
VCC = + 15V
10mV
65
INVERTER S ETTLING TIME
-10
0
25
65
105
TEMPERATURE ( C)
25
Tamb = + 25 C
VCC = + 15V
OUTPUT VOLTAGE SWING
FROM 0 V (V)
1.2
10
10/14
10
OPEN LOOP VOLTAGE GAIN (dB)
NORMALIZED SLEW RATE (V/µs)
VCC = – 15V
LF156-LF157
-15
AMBIENT TEMPERATURE ( C)
NORMALIZED S LEW RATE
1.4
VCC { – 10 V
– 15 V
5
1.8
1.6
LF156
8
10 1
1 10
VCC
90
= +15V
LF157
70
50
LF156
LF15 5
30
10
0
-10
1 01
10 2
10 3
104
105
106
FREQUENCY (Hz)
10 7
BODE P LOT
10
100
LF156
VCC = –15V
P has e
5
75
GAIN (dB)
Ga in
-5
25
0
-10
-15
-25
2k Ω
20 Ω
-20
-50
PHASE (degrees)
50
0
-
-75
-25
+
-30
-100
-35 0
10
-125
10 1
102
POWER SUPPLY REJECTION RATIO (dB)
LF155 - LF156 - LF157
POWER SUP PLY REJ ECTION RATIO
100
VCC = – 15V
T a mb = +25 C
80
P os itive s upply
60
40
Nega tive s upply
20
LF155
0
10 1
10 2
FREQUENCY (MHz)
1 25
5
LF15 6
VCC = –15V
GAIN (dB)
75
50
-5
25
Ga in
-10
0
-1 5
-25
2k Ω
-20
-50
20 Ω
-2 5
-
-75
-30
+
-10 0
-35
PHASE (degrees)
0
1 00
-12 5
-40
10 0
101
10 2
-150
POWER SUPPLY REJECTION RATIO (dB)
BODE P LOT
Pha se
100
LF157
VCC = –1 5V
GAIN (dB)
Ph ase
0
-25
10
-50
5
-7 5
2pF
0
4
Ω
-
2k
-1 00
Ω
-1 25
+
-15
-150
-25
10 0
-1 75
10 1
FREQUENCY (MHz)
102
PHASE (degrees)
15
-1 0
50
25
Gain
-5
75
COMMON-MODE REJECTION RATIO (dB)
BODE P LOT
20
10 6
12 0
VCC = – 15V
T amb = +25 C
10 0
P os itive s upply
80
LF1 56
60
LF1 57
LF157
40
LF1 56
Ne ga tive s upply
20
0
1 02
103
104
105
106
107
FREQUENCY (Hz)
35
25
10 5
P OWER S UPP LY REJECTION RATIO
FREQUENCY (MHz)
30
10 4
FREQUENCY (Hz )
15
10
10 3
COMMON-MODE REJ ECTION RATIO
100
VCC = – 15V
R L = 2kΩ
T a mb = +25 C
80
60
LF155
LF155
LF156
40
20
0
10 1
102
1 03
10 4
105
106
1 07
FREQUENCY (Hz)
11/14
EQUIVALENT INPUT NOISE VOLTAGE
(EXPANDED S CALE)
OUTP UT IMPEDANCE
10 3
100
T a mb = – 2 5 C
VCC = – 15V
80
60
40
LF15 5
20
OUTPUT IMPEDANCE (Ω)
EQUIVALENT INPUT NOISE VOLTAGE
(nV/ Hz)
LF155 - LF156 - LF157
LF156 , LF157
0
10 1
10 2
10 3
104
10 2
+
10 1
10 5
10 6
10 7
10 2
140
T a mb = +25 C
VCC = – 15V
120
OUTPUT IMPEDANCE (Ω)
EQUIVALENT INPUT NOISE VOLTAGE
(nV/ Hz)
10 4
OUTPUT IMPEDANCE
EQUIVALENT INPUT NOISE VOLTAGE
100
80
60
LF156
LF157
40
LF155
20
0
10 0
10 1
10 2
10 3
T amb = +25 C
VCC = – 15V
AV = 1
10
0
+
T amb = +25 C
20
AV = 1
LF156
< 1% Dist
16
12
LF155
LF157
AV = 5
8
4
0
10 4
10 5
10 6
FREQUENCY (Hz)
LF156
10 4
10 5
10 6
10 7
OUTP UT IMPEDANCE
10 2
VCC = – 15V
R L = 2kΩ
24
-
FREQUENCY (Hz)
107
OUTPUT IMPEDANCE (Ω)
28
AV = 10
10 -1
10 -2
10 3
10 4
AV = 100
10 1
UNDISTORTED OUTPUT VOLTAGE S WING
SWING (V)
AV = 10
FREQUENCY (Hz)
FREQUENCY (Hz)
PEAK TO PEAK OUTPUT VOLTAGE
AV = 1
LF155
FREQUENCY (Hz)
12/14
AV = 100
10 0
10 -1
10 3
100k
T amb = – 25 C
VCC = – 15V
-
T a mb = +25 C
VCC = – 15V
10 1
AV = 100
10 0
AV = 10
10 -1
+
10 -2
10 3
LF157
10 4
105
10 6
FREQUENCY (Hz)
10 7
LF155 - LF156 - LF157
PACKAGE MECHANICAL DATA
8 PINS - PLASTIC DIP
Dimensions
A
a1
B
b
b1
D
E
e
e3
e4
F
i
L
Z
Min.
Millimeters
Typ.
3.32
0.51
1.15
0.356
0.204
Max.
1.65
0.55
0.304
10.92
9.75
7.95
Min.
0.020
0.045
0.014
0.008
Max.
0.065
0.022
0.012
0.430
0.384
0.313
2.54
7.62
7.62
3.18
Inches
Typ.
0.131
0.100
0.300
0.300
6.6
5.08
3.81
1.52
0.125
0260
0.200
0.150
0.060
13/14
LF155 - LF156 - LF157
PACKAGE MECHANICAL DATA
8 PINS - PLASTIC MICROPACKAGE (SO)
Dimensions
A
a1
a2
a3
b
b1
C
c1
D
E
e
e3
F
L
M
S
Min.
Millimeters
Typ.
0.1
0.65
0.35
0.19
0.25
Max.
1.75
0.25
1.65
0.85
0.48
0.25
0.5
Min.
Inches
Typ.
0.026
0.014
0.007
0.010
Max.
0.069
0.010
0.065
0.033
0.019
0.010
0.020
0.189
0.228
0.197
0.244
0.004
o
45 (typ.)
4.8
5.8
5.0
6.2
1.27
3.81
3.8
0.4
0.050
0.150
4.0
1.27
0.6
0.150
0.016
0.157
0.050
0.024
o
8 (max.)
Information furnished is believed to be accurate and reliable. However, SGS-THO MSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which
may result from its use. No licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON
Microelectronics. Specifications mentioned in this pub lication are subject to change without notice. This pub lication supersedes
and replaces all information previously supplied. SGS-THOMSON Microelectronics product s are not authorized for use as critical
components in life suppo rt devices or systems without express written approval of SGS-THOMSON Microelectronics.
 1995 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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