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LT2179IS Datasheet

  • LT2179IS

  • 17uA Max, Dual and Quad, Single Supply, Precision Op Amps

  • 12頁(yè)

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LT 2178/LT 2179
17碌A(chǔ) Max, Dual and Quad,
Single Supply, Precision Op Amps
FEATURES
s
s
s
s
s
s
s
s
s
s
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DESCRIPTION
The LT
廬
2178 is a micropower dual op amp in a surface
mount standard 8-pin configuration, the LT2179 is a
micropower quad op amp offered in a surface mount 14-pin
package. Both devices are optimized for single supply opera-
tion at 5V. Specifications are also provided at
鹵15V
supply.
The extremely low supply current is combined with true
precision specifications: offset voltage is 30碌V and offset
current is 50pA. Both offset parameters have low drift
with temperature. The 1.5pA
P-P
current noise and
picoampere offset current permit the use the megohm
level source resistors without introducing serious errors.
Voltage noise, at 0.9碌V
P-P
, is remarkably low considering
the low supply current.
The LT2178/LT2179 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 resistors are needed.
For surface mount applications where three times higher
supply current is acceptable, the micropower LT1077
single, LT2078 dual and LT2079 quad are recommended.
The LT1077/LT2078/LT2079 have significantly higher
bandwidth, slew rate, lower voltage noise and better
output drive capability. For applications requiring DIP
packages refer to the LT1178/LT1179.
s
SO Package with Standard Pinout
Supply Current per Amplifier: 17碌A(chǔ) Max
Offset Voltage: 70碌V Max
Offset Current: 250pA Max
Input Bias Current: 5nA Max
Voltage Noise: 0.9碌V
P-P
, 0.1Hz to 10Hz
Current Noise: 1.5pA
P-P
, 0.1Hz to 10Hz
Offset Voltage Drift: 0.5碌V/擄C
Gain Bandwidth Product: 85kHz
Slew Rate: 0.04V/碌s
Single Supply Operation
Input Voltage Range Includes Ground
Output Swings to Ground while Sinking Current
No Pull-Down Resistors Needed
Output Sources and Sinks 5mA Load Current
APPLICATIONS
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Battery- or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Satellite Circuitry
Micropower Sample-and-Hold
Thermocouple Amplifier
Micropower Filters
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Self-Buffered, Dual Output, Micropower Reference
2
SUPPLY CURRENT PER AMPLIFIER (碌A(chǔ))
TOTAL BATTERY CURRENT = 28
碌A(chǔ)
OUTPUT ACCURACY =
鹵0.4%
MAX
TEMPERATURE COEFFICIENT = 20ppm/
擄C
LOAD REGULATION = 25ppm/mA, I
L
鈮?/div>
5mA, V
+
鈮?/div>
5V
LINE REGULATION = 10ppm/V
* 0.1% FILM RESISTORS
1/2 LT2178
1
250k
6
2M
0.1碌F
LT1004-1.2
1M*
1M*
LT2178/79 鈥?TA01
鈥?/div>
+
+
3
1.2365V
OUTPUT
4V TO 9V
4
5
8
7
2.470V
OUTPUT
1/2 LT2178
0.1碌F
U
U
U
Supply Current vs Temperature
20
鈥?/div>
18
V
S
=
鹵15V
16
14
V
S
= 5V, 0V
12
V
S
=
鹵1.5V
10
鈥?0
鈥?5
25
50
0
TEMPERATURE (擄C)
75
100
LT2178/79 鈥?TPC02
1

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