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LF157-LF257-LF357 데이터시트 PDF




STMicroelectronics에서 제조한 전자 부품 LF157-LF257-LF357은 전자 산업 및 응용 분야에서
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부품번호 LF157-LF257-LF357 기능
기능 WIDE BANDWIDTH SINGLE J-FET OPERATIONAL AMPLIFIERS
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LF157-LF257-LF357 데이터시트, 핀배열, 회로
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 ADJUSTMENT DOES NOT
DEGRADE DRIFT OR COMMON-MODE
. REJECTION AS IN MOST OF 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 CONVERTERS
. HIGH IMPEDANCE BUFFERS
. WIDEBAND, LOW NOISE, LOW DRIFT
AMPLIFIERS
. LOGARITHIMIC AMPLIFIERS
. PHOTOCELL AMPLIFIERS
. SAMPLE AND HOLD CIRCUITS
ORDER CODES
Part Number
LF355, LF356, LF357
LF255, LF256, LF257
LF155, LF156, LF157
Example : LF355N
Temperature
Range
0oC, +70oC
–40oC, +105oC
–55oC, +125oC
Package
ND
••
••
••
PIN CONNECTIONS (top view)
DE SC RI P TI O N
These circuits are monolithic J-FET input operational
amplifiers incorporating well matched, high voltage
J-FET on the same chip with standard bipolar transis-
tors.
This amplifiers feature low input bias and offset cur-
rents, low input offset voltage and input offset voltage
drift,coupledwith offsetadjust which doesnot degrade
drift or common-mode rejection.
The devices are also designed for high slew rate, wide
bandwidth,extremelyfastsettlingtime, lowvoltageand
current noise and a low 1/f noise level.
July 1998
18
27
36
45
1 - Offset Null 1
2 - Inverting input
3 - Non-inverting input
4 - VCC-
5 - Offset Null 2
6 - Output
7 - VCC+
8 - N.C.
1/14




LF157-LF257-LF357 pdf, 반도체, 판매, 대치품
LF155 - LF156 - LF157
ELECTRICAL CHARACTERISTICS
LF355, LF356, LF357
0oC Tamb +70oC
VCC = ±15V, (unless otherwise specified)
Symbol
Parameter
LF355 - LF356 - LF357
Min. Typ. Max.
Unit
Vio
Input Offset Voltage
Tamb = 25oC
(RS
=
50)
Tmin. Tamb Tmax.
mV
3 10
13
Iio
Input Offset Current - (note 3)
Tamb = 25oC
Tmin. Tamb Tmax.
3 50 pA
2 nA
Iib
Input Bias Current - (note 3)
Tamb = 25oC
Tmin. Tamb Tmax.
Avd
Large Signal Voltage
Tamb = 25oC
Gain
(RL
=
2k,
VO
=
±10V)
Tmin. Tamb Tmax.
20 200
8
pA
nA
25 200
15
V/mV
SVR Supply Voltage Rejection Ratio - (note 4)
80 100
dB
ICC
DVio
DVio/Vio
Vicm
Supply Current (no load)
Tamb = 25oC
LF355
LF356, LF357
Input Offset Voltage Drift (RS = 50) - (note 2)
Change in Average Temperature Coefficient with Vio adjust
(RS = 50)
Input Common Mode Voltage Range (Tamb = 25oC)
mA
24
5 10
5 µV/oC
0.5 µV/oC
per mV
±10 +15.1
-12
V
CMR Common Mode Rejection Ratio
80 100
dB
±VOPP
GBP
SR
Ri
Ci
en
Output Voltage Swing
RL = 10k
RL = 2k
Gain Bandwidth Product Tamb = 25oC)
LF355
LF356
LF357
Slew Rate (Tamb = 25oC)
AV = 1
LF355
LF356
AV = 5
LF357
Input Resistance (Tamb = 25oC)
Input Capacitance (Tamb = 25oC)
Equivalent Input Noise Voltage (Tamb = 25oC, RS = 100)
f = 1000Hz
LF355
LF356, LF357
f = 100Hz
LF355
LF356, LF357
±12 ±13
±10 ±12
2.5
5
20
5
12
50
1012
3
20
12
25
15
V
MHz
V/µs
pF
nV
Hz
in
Equivalent Input Noise Current
(Tamb = 25oC, f = 100Hz or f = 1000Hz)
ts Settling Time (Tamb = 25oC) - (note 5)
LF355
LF356, LF357
0.01
4
1.5
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 alsounaffected by
offset adjustment.
3. The input bias 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)xPtot where Rth(j-a)is the thermal resistance from junction to ambient. Use of a heatsink is recommended
f input currents are to be kept to a minimum.
4. Supply voltage rejection is measured for both supply magnitudes increasing or decreasing simultaneously, in accordance with
common practise.
5. Settling time is defined here, for a unity gain inverter connection using 2kresistors 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 2k
and the output step is 10V.
4/14

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LF157-LF257-LF357

WIDE BANDWIDTH SINGLE J-FET OPERATIONAL AMPLIFIERS

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