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PDF LF255H Data sheet ( Hoja de datos )

Número de pieza LF255H
Descripción Series Monolithic JFET Input Operational Amplifiers
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! LF255H Hoja de datos, Descripción, Manual

December 1994
LF155 LF156 LF157 Series Monolithic
JFET Input Operational Amplifiers
General Description
These are the first monolithic JFET input operational ampli-
fiers to incorporate well matched high voltage JFETs on the
same chip with standard bipolar transistors (BI-FETTM Tech-
nology) These amplifiers feature low input bias and offset
currents low offset voltage and 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 extremely fast settling time low volt-
age and current noise and a low 1 f noise corner
Advantages
Y Replace expensive hybrid and module FET op amps
Y Rugged JFETs allow blow-out free handling compared
with MOSFET input devices
Y Excellent for low noise applications using either high or
low source impedance very low 1 f corner
Y Offset adjust does not degrade drift or common-mode
rejection as in most monolithic amplifiers
Y New output stage allows use of large capacitive loads
(5 000 pF) without stability problems
Y Internal compensation and large differential input volt-
age capability
Applications
Y Precision high speed integrators
Y Fast D A and A D converters
Y High impedance buffers
Y Wideband low noise low drift amplifiers
Y Logarithmic amplifiers
Y Photocell amplifiers
Y Sample and Hold circuits
Common Features
(LF155A LF156A LF157A)
Y Low input bias current
Y Low Input Offset Current
Y High input impedance
Y Low input offset voltage
Y Low input offset voltage temp drift
Y Low input noise current
Y High common-mode rejection ratio
Y Large dc voltage gain
30 pA
3 pA
1012X
1 mV
3 mV C
0 01 pA 0Hz
100 dB
106 dB
Uncommon Features
Y Extremely
fast settling
time to
0 01%
LF155A
LF156A
LF157A
(AVe5)
Units
4 1 5 1 5 ms
Y Fast slew
rate
Y Wide gain
bandwidth
5 12 50 V ms
2 5 5 20 MHz
Y Low input
noise voltage
20
12 12 nV 0Hz
Simplified Schematic
3 pF in LF157 series
BI-FETTM BI-FET IITM are trademarks of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL H 5646
TL H 5646 – 1
RRD-B30M115 Printed in U S A

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LF255H pdf
Typical DC Performance Characteristics
Curves are for LF155 LF156 and LF157 unless otherwise specified
Input Bias Current
Input Bias Current
Input Bias Current
Voltage Swing
Supply Current
Supply Current
Negative Current Limit
Positive Current Limit
Positive Common-Mode
Input Voltage Limit
Negative Common-Mode
Input Voltage Limit
Open Loop Voltage Gain
TL H 5646 – 2
Output Voltage Swing
TL H 5646 – 3
5

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LF255H arduino
Typical Applications (Continued)
Fast Logarithmic Converter
 Dynamic range 100 mA s Ii s 1 mA (5 dec-
ades) lVOle1V decade
 Transient response 3 ms for DIie 1 decade
 C1 C2 R2 R3 added dynamic compensation
 VOS adjust the LF156 to minimize quiescent error
 RT Tel Labs type Q81 a 0 3% C
TL H 5646 – 21
l l ( (VOUT e
R2
1a
RT
kT
q ln Vi
Rr
VREF Ri
1
e log Vi RiIr R2 e 15 7k RT e 1k 0 3%
C (for temperature compensation)
Precision Current Monitor
 VOe5 R1 R2 (V mA of IS)
 R1 R2 R3 0 1% resistors
 Use LF155 for
X Common-mode range to supply range
X Low IB
X Low VOS
X Low Supply Current
TL H 5646 – 31
8-Bit D A Converter with Symmetrical Offset Binary Operation
TL H 5646 – 32
 R1 R2 should be matched within g0 05%
 Full-scale response time 3ms
EO B1 B2 B3 B4 B5 B6 B7 B8
Comments
a9 920 1 1 1 1 1 1 1 1 Positive Full-Scale
a0 040 1 0 0 0 0 0 0 0 (a) Zero-Scale
b0 040 0 1 1 1 1 1 1 1 (b) Zero-Scale
b9 920 0 0 0 0 0 0 0 0 Negative Full-Scale
11

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