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LT2179_15

Description
17A Max, Dual and Quad, Single Supply, Precision Op Amps
File Size203KB,12 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LT2179_15 Overview

17A Max, Dual and Quad, Single Supply, Precision Op Amps

FEATURES
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LT2178/LT2179
17µA Max, Dual and Quad,
Single Supply, Precision Op Amps
DESCRIPTION
The LT
®
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 operation at 5V. Specifications are also provided
at
±15V
supply.
The extremely low supply current is combined with true
precision specifications: offset voltage is 30μV 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 0.9μV
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.
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SO Package with Standard Pinout
Supply Current per Amplifier: 17μA Max
Offset Voltage: 70μV Max
Offset Current: 250pA Max
Input Bias Current: 5nA Max
Voltage Noise: 0.9μV
P-P
, 0.1Hz to 10Hz
Current Noise: 1.5pA
P-P
, 0.1Hz to 10Hz
Offset Voltage Drift: 0.5μV/°C
Gain Bandwidth Product: 85kHz
Slew Rate: 0.04V/μs
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
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Self-Buffered, Dual Output, Micropower Reference
2
SUPPLY CURRENT PER AMPLIFIER A)
TOTAL BATTERY CURRENT = 28mA
OUTPUT ACCURACY = 0.4% MAX
TEMPERATURE COEFFICIENT = 20ppm/°C
LOAD REGULATION = 25ppm/mA, I
L
≤ 5mA, V
+
≥ 5V
LINE REGULATION = 10ppm/V
* 0.1% FILM RESISTORS
20
Supply Current vs Temperature
1/2 LT2178
1
250k
6
0.1μF
LT1004-1.2
2M
1M*
1M*
21789 TA01
+
+
3
1.2365V
OUTPUT
4V TO 9V
18
V
S
= 15V
16
4
5
8
7
2.470V
OUTPUT
1/2 LT2178
0.1μF
14
V
S
= 5V, 0V
12
V
S
= 1.5V
10
–50
–25
25
50
0
TEMPERATURE (°C)
75
100
21789fc
21789 TA02
1

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