LT1178_15 Datasheet, PDF (1/12 Pages) Linear Technology – 17A Max, Dual and Quad, Single Supply, Precision Op Amps

LT1178/LT1179
17µA Max, Dual and Quad,
Single Supply, Precision Op Amps
FEATURES
■ _{17µA Max Supply Current per Amplifier}
■ _{70µV Max Offset Voltage}
■ _{250pA Max Offset Current}
■ _{5nA Max Input Bias Current}
■ _{0.9µVP-P 0.1Hz to 10Hz Voltage Noise}
■ _{1.5pAP-P 0.1Hz to 10Hz Current Noise}
■ _{0.5µV/°C Offset Voltage Drift}
■ _{85kHz Gain-Bandwidth Product}
■ _{0.04V/µs Slew Rate}
■ _{Single Supply Operation:}
Input Voltage Range Includes Ground
Output Swings to Ground While Sinking Current
No Pull Down Resistors are Needed
■ _{Output Sources and Sinks 5mA Load Current}
U
APPLICATIO S
■ _{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.
DESCRIPTIO
The LT^®1178 is a micropower dual op amp in the standard
8-pin configuration; the LT1179 is a micropower quad op
amp offered in the standard 14-pin packages. Both
devices are optimized for single supply operation at 5V.
Specifications are also provided at ±15V supplies.
The extremely low supply current is combined with true
precision specifications: offset voltage is 30µV, offset
current is 50pA. Both offset parameters have low drift with
temperature. The 1.5pAp-p current noise and picoampere
offset current permit the use of megaohm level source
resistors without introducing serious errors. Voltage noise,
at 0.9µVp-p, is remarkably low considering the low
supply current.
Both the LT1178 and LT1179 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 applications where three times higher supply
current is acceptable, the micropower LT1077 single,
LT1078 dual and LT1079 quad are recommended. The
LT1077/78/79 have significantly higher bandwidth, slew
rate, lower voltage noise and better output drive capability.
TYPICAL APPLICATIO
Self-Buffered, Dual Output, Micropower Reference
2_–
1
1/2 LT1178
3₊
4
250k*
0.1µF
LT1004-1.2
2M
1M*
4V TO 9V
5₊
8
7
1/2 LT1178
6_–
0.1µF
1M*
1.2365V
OUTPUT
2.470V
OUTPUT
* = 0.1% FILM RESISTORS
TOTAL BATTERY CURRENT = 28µA
OUTPUT ACCURACY = ± 0.4% MAX
TEMPERATURE COEFFICIENT = 20ppm/°C
LOAD REGULATION = 25ppm/mA, I_L ≤ 5mA, V ⁺ ≥ 5V
LINE REGULATION = 10ppm/V
LT1178/LT1179 • TA01
Supply Current vs Temperature
20
18
V_S = ±15V
16
V_S = 5V, 0V
14
V_S = ±1.5V
12
10
–50 –25 0
25 50 75 100
TEMPERATURE (°C)
LT1178/LT1179 • TA02
11789fb
1