LT1008_15 Datasheet, PDF (16/16 Pages) Linear Technology – Picoamp Input Current, Microvolt Offset, Low Noise Op Amp

LT1008
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
100μA
METER
Q3
R1
2k
1.2k
CURRENT
INPUT
Q1
15V
10k _{2 –}
7
6
LT1008
3₊
4
8
Q2
33k
Q4
1
–15V ^{PIN 13}
CA3146
100pA
RANGE 1nA
10nA
100nA
0.01μF
1μA
549Ω
549Ω
549Ω
549Ω
Q1 TO Q4: RCA CA3146 TRANSISTOR ARRAY
CALIBRATION: ADJUST R1 FOR FULL SCALE
DEFLECTION WITH 1μA INPUT CURRENT
10μA
100μA
549Ω
549Ω
10k
15V
LT1004C-1.2
1008 TA11
RELATED PARTS
PART NUMBER
LT1012
LT1112
LT1880
LT1881/LT1882
LT1884/LT1885
DESCRIPTION
Picoamp Input Current, Microvolt Offset, Low Noise Op Amp
Dual Low Power, Precision, Picoamp Input Op Amp
SOT-23, Rail-to-Rail Output, Picoamp Input Current Precision Op Amp
Dual and Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps
Dual and Quad Rail-to-Rail Output, Picoamp Input Precision Op Amps
COMMENTS
Internally Compensated LT1008
Dual LT1012
Single SOT-23 Version of LT1884
Dual/Quad C_LOAD Stable
Dual/Quad Faster LT1881/LT1882
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
1008fb
LT 0607 REV B • PRINTED IN THE USA
© LINEAR TECHNOLOGY CORPORATION 1991