LT2178 Datasheet, PDF (1/12 Pages) Linear Technology – 17uA Max, Dual and Quad, Single Supply, Precision Op Amps

LT 2178/LT 2179
17µA Max, Dual and Quad,
Single Supply, Precision Op Amps
FEATURES
s _{SO Package with Standard Pinout}
s _{Supply Current per Amplifier: 17µA Max}
s _{Offset Voltage: 70µV Max}
s _{Offset Current: 250pA Max}
s _{Input Bias Current: 5nA Max}
s _{Voltage Noise: 0.9µVP-P, 0.1Hz to 10Hz}
s _{Current Noise: 1.5pAP-P, 0.1Hz to 10Hz}
s _{Offset Voltage Drift: 0.5µV/°C}
s _{Gain Bandwidth Product: 85kHz}
s _{Slew Rate: 0.04V/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}
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}
, LTC and LT are registered trademarks of Linear Technology Corporation.
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 opera-
tion 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.
TYPICAL APPLICATION
Self-Buffered, Dual Output, Micropower Reference
2–
1
1/2 LT2178
3+
4
250k
0.1µF
LT1004-1.2
1.2365V
OUTPUT
4V TO 9V
TOTAL BATTERY CURRENT = 28 µA
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
5+ 8
7
1/2 LT2178
6–
2.470V
OUTPUT
2M
0.1µF
1M*
1M*
LT2178/79 • TA01
Supply Current vs Temperature
20
18
V_S = ±15V
16
14
V_S = 5V, 0V
12
V_S = ±1.5V
10
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
LT2178/79 • TPC02
1