Datasheet

16
LT1008
1008fb
PART NUMBER DESCRIPTION COMMENTS
LT1012 Picoamp Input Current, Microvolt Offset, Low Noise Op Amp Internally Compensated LT1008
LT1112 Dual Low Power, Precision, Picoamp Input Op Amp Dual LT1012
LT1880 SOT-23, Rail-to-Rail Output, Picoamp Input Current Precision Op Amp Single SOT-23 Version of LT1884
LT1881/LT1882 Dual and Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps Dual/Quad C
LOAD
Stable
LT1884/LT1885 Dual and Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps Dual/Quad Faster LT1881/LT1882
© LINEAR TECHNOLOGY CORPORATION 1991
LT 0607 REV B • PRINTED IN THE USA
RELATED PARTS
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
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www.linear.com
U
TYPICAL APPLICATIO
Ammeter measures currents from 100pA to 100μA with-
out the use of expensive high value resistors. Accuracy at
100μA is limited by the offset voltage between Q1 and Q2
and at 100pA by the inverting bias current of the LT1008.
Ammeter with Six Decade Range
–
+
–15V
0.01μF
15V
7
6
2
CURRENT
INPUT
3
10k
4
8
1
33k
RANGE 1nA
10nA
LT1008
Q4
Q2
PIN 13
CA3146
Q1
Q3
100μA
METER
15V
549Ω
100nA
549Ω
LT1004C-1.2
100pA
549Ω
1.2k
R1
2k
10k
1μA
549Ω
Q1 TO Q4: RCA CA3146 TRANSISTOR ARRAY
CALIBRATION: ADJUST R1 FOR FULL SCALE
DEFLECTION WITH 1μA INPUT CURRENT
10μA
549Ω
100μA
549Ω
1008 TA11