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PDF LT2079 Data sheet ( Hoja de datos )
| Número de pieza | LT2079 | |
| Descripción | Micropower/ Dual and Quad/ Single Supply/ Precision Op Amps | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Supply Current per Amplifier: 50µA Max
s Offset Voltage: 70µV Max
s Offset Current: 250pA Max
s Voltage Noise: 0.6µVP-P, 0.1Hz to 10Hz
s Current Noise: 3pAP-P, 0.1Hz to 10Hz
s Offset Voltage Drift: 0.4µV/°C
s Gain Bandwidth Product: 200kHz
s Slew Rate: 0.07V/µs
s Single Supply Operation
Input Voltage Range Includes Ground
Output Swings to Ground while Sinking Current
No Pull-Down Resistors Needed
s Output Sources and Sinks 5mA Load Current
s SO Package with Standard Pinout
U
APPLICATIONS
s Battery or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Satellite Circuitry
s Micropower Sample-and-Hold
s Thermocouple Amplifier
s Micropower Filters
LT 2078/LT 2079
Micropower, Dual and
Quad, Single Supply,
Precision Op Amps
DESCRIPTION
The LT®2078 is a micropower dual op amp in 8-pin small
outline, standard surface mount package, and LT2079 is
a micropower quad op amp offered in the standard 14-pin
surface mount package. Both devices are optimized for
single supply operation at 5V. ±15V specifications are also
provided.
Micropower performance of competing devices is achieved
at the expense of seriously degrading precision, noise,
speed and output drive specifications. The design effort of
the LT2078/LT2079 was concentrated on reducing sup-
ply current without sacrificing other parameters. The
offset voltage achieved is the lowest on any dual or quad
nonchopper stabilized op amp––micropower or other-
wise. Offset current, voltage and current noise, slew rate
and gain bandwidth product are all two to ten times better
than on previous micropower op amps.
Both the LT2078/LT2079 can be operated from a single
supply (as low as one lithium cell or two NiCd batteries).
The input range goes below ground. The all NPN output
stage swings to within a few millivolts of ground while
sinking current––no power consuming pull-down resis-
tors are needed. For applications requiring DIP packages
refer to the LT1078/LT1079.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Single Battery, Micropower, Gain = 100, Instrumentation Amplifier
10.1k
1M
1M 2 –
A
INVERTING 3 +1/2 LT2078
–INPUT
1 10.1k
3V
(Li-Ion)
6– 8
B
NONINVERTING 5 +1/2 LT2078
+INPUT
4
7
OUT
LT2078/79 • TA01
TYPICAL PERFORMANCE
INPUT OFFSET VOLTAGE = 40µV
INPUT OFFSET CURRENT = 0.2nA
OUTPUT NOISE = 85µVP-P 0.1Hz TO 10Hz
= 300µVRMS OVER FULL BANDWIDTH
INPUT RANGE = 0.03V TO 1.8V
TOTAL POWER DISSIPATION = 240µW
OUTPUT RANGE = 0.03V TO 2.3V
COMMON MODE REJECTION = 110dB (AMPLIFIER LIMITED)
(0.3mV ≤ VIN+ – VIN– ≤ 23mV)
GAIN BANDWIDTH PRODUCT = 200kHz
OUTPUTS SINK CURRENT—NO PULL-DOWN RESISTORS
Distribution of Input Offset Voltage
800
VS = 5V, 0V
700 5000 OP AMPS
600
500
400
300
200
100
0
–120
–80 –40 0 40 80
INPUT OFFSET VOLTAGE (µV)
120
2078/79 • TA02
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1 page  
LT 2078/LT 2079
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = ±15V, 0°C ≤ TA ≤ 70°C, unless otherwise noted (Note 7).
SYMBOL PARAMETER
VOS Input Offset Voltage
CONDITIONS
LT2078
LT2079
∆VOS
∆T
IOS
IB
AVOL
CMRR
PSRR
IS
Input Offset Voltage Drift
(Note 6)
Input Offset Current
Input Bias Current
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Maximum Output Voltage Swing
Supply Current per Amplifier
LT2078
LT2079
VO = ±10V, RL = 5k
VCM = 13V, –15V
VS = 5V, 0V to ±18V
RL = 5k
LT2078AC/LT2079AC
MIN TYP MAX
q 70 330
q 80 410
q 0.5 1.8
q 0.6 3.0
q 0.06 0.35
q 69
q 300 1200
q 95 112
q 98 112
q ±11.0 ±13.6
q 49 73
LT2078C/LT2079C
MIN TYP MAX
90 460
100 540
0.6 2.5
0.7 3.8
0.06 0.50
6 11
250 1200
92 112
95 112
±11.0 ±13.6
50
85
UNITS
µV
µV
µV/°C
µV/°C
nA
nA
V/mV
dB
dB
V
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Typical parameters are defined as the 60% yield of parameter
distributions of individual amplifiers, i.e., out of 100 LT2079s (or 100
LT2078s) typically 240 op amps (or 120) will be better than the indicated
specification.
Note 3: This parameter is tested on a sample basis only. All noise
parameters are tested with VS = ±2.5V, VO = 0V.
Note 4: This parameter is guaranteed by design and is not tested.
Note 5: Power supply rejection ratio is measured at the minimum supply
voltage. The op amps actually work at 1.8V supply but with a typical offset
skew of –300µV.
Note 6: This parameter is not 100% tested.
Note 7: The LT2078C/LT2079C are designed, characterized and expected
to meet the industrial temperature limits, but are not tested at – 40°C and
85°C. I-grade parts are guaranteed.
TYPICAL PERFORMANCE CHARACTERISTICS
Distribution of Offset Voltage
Drift with Temperature
25
VS = 5V, 0V
VCM = 0.1V
20 80 LT2078'S
25 LT2079'S
= 260 OP AMPS
15
10
5
0
–2 –1
0
1
2
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C)
LT2078/79 • TPC01
Input Bias and Offset Currents vs
Temperature
100
VS = 5V, 0V TO ±15V
50 IOS
0
–5
IB
–6
–7
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LT2078/79 • TPC02
Input Bias Current vs
Common Mode Voltage
0
VS = 5V, 0V
–2
TA = 125°C
–4 TA = –55°C
–6 TA = 25°C
–8
–10
–12
–1
0123
COMMON MODE VOLTAGE (V)
4
LT2078/79 • TPC03
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5 Page 
LT 2078/LT 2079
APPLICATIONS INFORMATION
1. When the input is more than a diode drop below ground,
unlimited current will flow from the substrate (V –
terminal) to the input. This can destroy the unit. On the
LT2078/LT2079, resistors in series with the input protect
the devices even when the input is 5V below ground.
2. When the input is more than 400mV below ground (at
25°C), the input stage saturates and phase reversal
occurs at the output. This can cause lockup in servo
systems. Due to a unique phase reversal protection cir-
cuitry, the LT2078/LT2079 output does not reverse, as
illustrated in Figure 2, even when the inputs are at –1V.
Distortion
There are two main contributors of distortion in op amps:
distortion caused by nonlinear common mode rejection
and output crossover distortion as the output transitions
from sourcing to sinking current. The common mode
rejection of the LT2078/LT2079 is very good, typically
108dB. Therefore, as long as the input operates in the
normal common mode range, there will be very little
common mode induced distortion. If the op amp is oper-
ating inverting there is no common mode induced distor-
tion. Crossover distortion will increase as the output load
resistance decreases. For the lowest distortion the LT2078/
LT2079 should be operated with the output always sourc-
ing current, this is usually accomplished by putting a
resistor from the output to V –. In an inverting configura-
tion with no load, the output will source and sink current
through the feedback resistor. High value feedback resis-
tors will reduce crossover distortion and maintain
micropower operation.
Matching Specifications
In many applications the performance of a system de-
pends on the matching between two op amps, rather than
Table 1
PARAMETER
VOS Match, ∆VOS
LT2078
LT2079
Temperature Coefficient ∆VOS
Average Noninverting IB
Match of Noninverting IB
CMRR Match
PSRR Match
LT2078AC/LT2079AC/LT2078AI/LT2079AI
50% YIELD
98% YIELD
30 110
40 150
0.5 1.2
68
0.12 0.4
120 100
117 105
LT2078C/LT2079C/LT2078I/LT2079I
50% YIELD
98% YIELD
50 190
50 250
0.6 1.8
6 10
0.15 0.5
117 97
117 102
UNITS
µV
µV
µV/°C
nA
nA
dB
dB
4V 4V 4V
2V 2V 2V
0V 0V 0V
6VP-P INPUT
–1V TO 5V
1ms/DIV
LT2078/79 • F01a
1ms/DIV
OP-90 EXHIBITS OUTPUT PHASE REVERSAL
LT2078/79 • F01b
1ms/DIV
LT2078/LT2079 NO PHASE REVERSAL
Figure 2. Voltage Follower with Input Exceeding the Negative Common Mode Range (VS = 5V, 0V)
LT2078/79 • F01C
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT2079.PDF ] | |
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