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PDF LT1113 Data sheet ( Hoja de datos )
| Número de pieza | LT1113 | |
| Descripción | Dual Low Noise/ Precision/ JFET Input Op Amps | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1113
Dual Low Noise,
Precision, JFET Input Op Amps
FEATURES
s 100% Tested Low Voltage Noise: 6nV/√Hz Max
s SO-8 Package Standard Pinout
s Voltage Gain: 1.2 Million Min
s Offset Voltage: 1.5mV Max
s Offset Voltage Drift: 15µV/°C Max
s Input Bias Current, Warmed Up: 450pA Max
s Gain Bandwidth Product: 5.6MHz Typ
s Guaranteed Specifications with ±5V Supplies
s Guaranteed Matching Specifications
U
APPLICATIO S
s Photocurrent Amplifiers
s Hydrophone Amplifiers
s High Sensitivity Piezoelectric Accelerometers
s Low Voltage and Current Noise Instrumentation
Amplifier Front Ends
s Two and Three Op Amp Instrumentation Amplifiers
s Active Filters
DESCRIPTIO
The LT®1113 achieves a new standard of excellence in noise
performance for a dual JFET op amp. The 4.5nV/√Hz 1kHz
noise combined with low current noise and picoampere
bias currents makes the LT1113 an ideal choice for ampli-
fying low level signals from high impedance capacitive
transducers.
The LT1113 is unconditionally stable for gains of 1 or more,
even with load capacitances up to 1000pF. Other key fea-
tures are 0.4mV VOS and a voltage gain of 4 million. Each
individual amplifier is 100% tested for voltage noise, slew
rate and gain bandwidth.
The design of the LT1113 has been optimized to achieve
true precision performance with an industry standard
pinout in the S0-8 package. A set of specifications are
provided for ±5V supplies and a full set of matching speci-
fications are provided to facilitate the use of the LT1113 in
matching dependent applications such as instrumenta-
tion amplifier front ends.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Low Noise Hydrophone Amplifier with DC Servo
R1*
100M
R3
3.9k
R2 C1*
200Ω
5V TO 15V
2– 8
1/2
3 +LT1113
1
4
–5V TO –15V
HYDRO-
CT
R8
100M
R6
100k
PHONE
R7
1M
7
C2
0.47µF
6
1/2
LT1113 5
R4
1M
R5
1M
DC OUTPUT ≤ 2.5mV FOR TA < 70°C
OUTPUT VOLTAGE NOISE = 128nV/√Hz AT 1kHz (GAIN = 20)
C1 ≈ CT ≈ 100pF TO 5000pF; R4C2 > R8CT; *OPTIONAL
OUTPUT
1113 TA01
1kHz Input Noise Voltage Distribution
40 VS = ±15V
TA = 25°C
138 S8
30 276 OP AMPS TESTED
20
10
0
3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8
INPUT VOLTAGE NOISE (nV/√Hz)
1113 TA02
1
1 page  
LT1113
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the temperature range – 55°C ≤ TA ≤ 125°C. VS = ±15V, VCM = 0V,
unless otherwise noted. (Note 12)
SYMBOL PARAMETER
CONDITIONS (Note 4)
AVOL Large-Signal Voltage Gain
VO = ±12V, RL = 10k
VO = ±10V, RL = 1k
VOUT Output Voltage Swing
RL = 10k
RL = 1k
SR Slew Rate
RL ≥ 2k (Note 9)
GBW Gain Bandwidth Product
fO = 100kHz
IS Supply Current Per Amplifier
VS = ± 5V
∆VOS
∆IB+
Offset Voltage Match
Noninverting Bias Current Match
∆CMRR Common Mode Rejection Match (Note 11)
∆PSRR Power Supply Rejection Match (Note 11)
LT1113AM
MIN TYP MAX
q 800 2700
q 400 1500
q ±13.0 ±12.5
q ±11.5 ±12.0
q 1.9 3.3
q 2.2 3.4
q 5.30 6.35
q 5.25 6.30
q 1.0 5.0
q 1.8 12
q 75 92
q 76 91
LT1113M
MIN TYP MAX
700 2500
300 1000
±12.5 ±12.5
±11.0 ±12.0
1.6 3.3
2.2 3.4
5.30 6.55
5.25 6.50
1.0 5.5
2.0 20
73 92
74 91
UNITS
V/mV
V/mV
V
V
V/µs
MHz
mA
mA
mV
nA
dB
dB
Note 1: Absolute Maximum Ratings are those values beyond which the
life of the device may be impaired.
Note 2: The LT1113C is guaranteed functional over the Operating
Temperature Range of –40°C to 85°C. The LT1113M is guaranteed
functional over the Operating Temperature Range of – 55°C to 125°C.
Note 3: The LT1113C is guaranteed to meet specified performance from
0°C to 70°C. The LT1113C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. For guaranteed I grade parts, consult the
factory. The LT1113M is guaranteed to meet specified performance from
–55°C to 125°C.
Note 4: Typical parameters are defined as the 60% yield of parameter
distributions of individual amplifiers, i.e., out of 100 LT1113s (200 op
amps) typically 120 op amps will be better than the indicated
specification.
Note 5: Warmed-up IB and IOS readings are extrapolated to a chip
temperature of 50°C from 25°C measurements and 50°C characterization
data.
Note 6: Current noise is calculated from the formula:
in = (2qIB)1/2
where q = 1.6 • 10 –19 coulomb. The noise of source resistors up to 200M
swamps the contribution of current noise.
Note 7: Input voltage range functionality is assured by testing offset
voltage at the input voltage range limits to a maximum of 2.3mV
(A grade) to 2.8mV (C grade).
Note 8: This parameter is not 100% tested.
Note 9: Slew rate is measured in AV = –1; input signal is ±7.5V, output
measured at ±2.5V.
Note 10: The LT1113 is designed, characterized and expected to meet
these extended temperature limits, but is not tested at –40°C and 85°C.
Guaranteed I grade parts are available. Consult factory.
Note 11: ∆CMRR and ∆PSRR are defined as follows:
(1) CMRR and PSRR are measured in µV/V on the individual
amplifiers.
(2) The difference is calculated between the matching sides in µV/V.
(3) The result is converted to dB.
Note 12: The LT1113 is measured in an automated tester in less than
one second after application of power. Depending on the package used,
power dissipation, heat sinking, and air flow conditions, the fully
warmed-up chip temperature can be 10°C to 50°C higher than the
ambient temperature.
5
5 Page 
APPLICATI S I FOR ATIO
INPUT: ±5.2V Sine Wave
LT1113 Output
LT1113
OPA2111 Output
Figure 3. Voltage Follower with Input Exceeding the Common-Mode Range ( VS = ±5V)
resistor (RB) will reduce the IR errors due to IB by an order
of magnitude. A further reduction of IR errors can be
achieved by using a DC servo circuit shown in the applica-
tions section of this data sheet. The DC servo has the
advantage of reducing a wide range of IR errors to the
millivolt level over a wide temperature variation. The
preservation of dynamic range is especially important
when reduced supplies are used, since input bias currents
can exceed the nanoamp level for die temperatures
over 85°C.
To take full advantage of a wide input common mode
range, the LT1113 was designed to eliminate phase rever-
sal. Referring to the photographs shown in Figure 3, the
LT1113 is shown operating in the follower mode (AV = +1)
at ±5V supplies with the input swinging ±5.2V. The output
of the LT1113 clips cleanly and recovers with no phase
reversal, unlike the competition as shown by the last
photograph. This has the benefit of preventing lock-up in
servo systems and minimizing distortion components.
The effect of input and output overdrive on one amplifier
has no effect on the other, as each amplifier is biased
independently.
Advantages of Matched Dual Op Amps
In many applications the performance of a system
depends on the matching between two operational ampli-
fiers rather than the individual characteristics of the two op
amps. Two or three op amp instrumentation amplifiers,
tracking voltage references and low drift active filters
are some of the circuits requiring matching between two
op amps.
The well-known triple op amp configuration in Figure 4
illustrates these concepts. Output offset is a function of the
difference between the two halves of the LT1113. This
error cancellation principle holds for a considerable
number of input referred parameters in addition to
offset voltage and bias current. Input bias current will
be the average of the two noninverting input currents
(IB+). The difference between these two currents (∆IB+)
is the offset current of the instrumentation amplifier.
Common mode and power supply rejections will be
dependent only on the match between the two amplifiers
(assuming perfect resistor matching).
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1113.PDF ] | |
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