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PDF LT1055M Data sheet ( Hoja de datos )
| Número de pieza | LT1055M | |
| Descripción | Precision/ High Speed/ JFET Input Operational Amplifiers | |
| Fabricantes | Linear Technology | |
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LT1055/LT1056
Precision, High Speed,
JFET Input Operational Amplifiers
FEATURES
■ Guaranteed Offset Voltage: 150µV Max
–55°C to 125°C: 500µV Max
■ Guaranteed Drift: 4µV/°C Max
■ Guaranteed Bias Current
70°C: 150pA Max
125°C: 2.5nA Max
■ Guaranteed Slew Rate: 12V/µs Min
■ Available in 8-Pin PDIP and SO Packages
U
APPLICATIO S
■ Precision, High Speed Instrumentation
■ Logarithmic Amplifiers
■ D/A Output Amplifiers
■ Photodiode Amplifiers
■ Voltage-to-Frequency Converters
■ Frequency-to-Voltage Converters
■ Fast, Precision Sample-and-Hold
DESCRIPTIO
The LT®1055/LT1056 JFET input operational amplifiers
combine precision specifications with high speed perfor-
mance.
For the first time, 16V/µs slew rate and 6.5MHz gain
bandwidth product are simultaneously achieved with off-
set voltage of typically 50µV, 1.2µV/°C drift, bias currents
of 40pA at 70°C and 500pA at 125°C.
The 150µV maximum offset voltage specification is the
best available on any JFET input operational amplifier.
The LT1055 and LT1056 are differentiated by their operat-
ing currents. The lower power dissipation LT1055 achieves
lower bias and offset currents and offset voltage. The
additional power dissipation of the LT1056 permits higher
slew rate, bandwidth and faster settling time with a slight
sacrifice in DC performance.
The voltage-to-frequency converter shown below is one of
the many applications which utilize both the precision and
high speed of the LT1055/LT1056.
For a JFET input op amp with 23V/µs guaranteed slew rate,
refer to the LT1022 data sheet.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
1Hz to 10kHz Voltage-to-Frequency Converter
4.7k
15V
3M
0.001 (POLYSTYRENE)
0V TO 10V
INPUT
10kHZ
TRIM
5k
75k
2N3906
= 1N4148
*1% FILM
–15V
0.1µF 22k
3.3M
2–
15V
7
LT1056
3+ 4
–15V
33pF
6
OUTPUT
1Hz TO 10kHz
1.5k
0.005%
LINEARITY
LM329
0.1µF
THE LOW OFFSET VOLTAGE OF LT1056
CONTRIBUTES ONLY 0.1Hz OF ERROR
WHILE ITS HIGH SLEW RATE PERMITS
10kHz OPERATION.
LT1055/56 TA01
Distribution of Input Offset Voltage
(H Package)
140 VS = ±15V
120
TA = 25°C
634 UNITS TESTED
FROM THREE RUNS
100
50% TO ±60µV
80
60
40
20
0
–400 –200
0
200 400
INPUT OFFSET VOLTAGE (µV)
LT1055/56 TA02
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1
1 page  
LT1055/LT1056
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the temperature range
0°C ≤ TA ≤ 70°C. VS = ±15V, VCM = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
LT1055CS8/LT1056CS8
MIN TYP MAX UNITS
VOS Input Offset Voltage (Note 2)
Average Temperature Coefficient of Input Offset Voltage
●
800 2200
µV
● 4 15 µV/°C
IOS
IB
AVOL
CMRR
PSRR
VOUT
Input Offset Current
Input Bias Current
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
Warmed Up, TA = 70°C
Warmed Up, TA = 70°C
VO = ±10V, RL = 2k
VCM = ±10.5V
VS = ±10V to ±18V
RL = 2K
●
●
● 60
● 82
● 87
● ±12
18
± 60
250
98
103
±13.1
150
±400
pA
pA
V/mV
dB
dB
V
For MIL-STD components, please refer to LTC883 data sheet for test
listing and parameters.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Offset voltage is measured under two different conditions:
(a) approximately 0.5 seconds after application of power; (b) at TA = 25°C
only, with the chip heated to approximately 38°C for the LT1055 and to
45°C for the LT1056, to account for chip temperature rise when the device
is fully warmed up.
Note 3: 10Hz noise voltage density is sample tested on every lot of A
grades. Devices 100% tested at 10Hz are available on request.
Note 4: This parameter is tested on a sample basis only.
Note 5: Current noise is calculated from the formula: in = (2qlB)1/2, where
q = 1.6 • 10–19 coulomb. The noise of source resistors up to 1GΩ swamps
the contribution of current noise.
Note 6: Offset voltage drift with temperature is practically unchanged
when the offset voltage is trimmed to zero with a 100k potentiometer
between the balance terminals and the wiper tied to V+. Devices tested to
tighter drift specifications are available on request.
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5 Page 
LT1055/LT1056
APPLICATIONS INFORMATION
Phase Reversal Protection
Most industry standard JFET input op amps (e.g., LF155/
LF156, LF351, LF411, OP15/16) exhibit phase reversal at
the output when the negitive common mode limit at the
input is exceeded (i.e., from –12V to –15V with ±15V
supplies). This can cause lock-up in servo systems. As
shown below, the LT1055/LT1056 does not have this
problem due to unique phase reversal protection circuitry
(Q1 on simplified schematic).
Voltage Follower with Input Exceeding the Negative
Common Mode Range
INPUT
±15V
SINE WAVE
15V
2– 7
LT1055/56
3+
4
–15V
6 OUTPUT
2k
LT1055/56 AI05
Output
Output
Input
(LF155/LF56, LF441, OP-15/OP-16)
LT1055/LT1056
0.5ms/DIV
LT1055/56 AI06
0.5ms/DIV
LT1055/56 AI07
0.5ms/DIV
LT1055/56 AI08
TYPICAL APPLICATIONS †
Exponential Voltage-to-Frequency Converter for Music Synthesizers
INPUT
0V TO 10V
EXPONENT
TRIM
2500Ω*
3.57k*
ZERO TRIM
11.3k*
6
500k
4.7k
500pF
POLYSTYRENE
5 15V
4 2–
7
LT1055
3+
6
1.1k –15V
2N3906
2N3904
500Ω*
SAWTOOTH
OUTPUT
1k*
562Ω*
15V
LM329
10k*
1k*
1
2
10k*
15V
2– 7
LM301A
6 3k
3+
8
1N148
1
3 4 0.01µF
SCALE FACTOR
1V IN OCTAVE OUT
*1% METAL FILM RESISTOR
PIN NUMBERED TRANSISTORS = CA3096 ARRAY
–15V
TEMPERATURE CONTROL LOOP
4.7k
13
14
15V
9
8
7
15 2.2k
33Ω
LT1055/56 TA03
†For ten additional applications utilizing the
LT1055 and LT1056, please see the LTC1043
data sheet and Application Note 3.
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11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1055M.PDF ] | |
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