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TL031MP View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
TL031MP ENHANCED-JFET LOW-POWER LOW-OFFSET OPERATIONAL AMPLIFIERS TI
Texas Instruments TI
TL031MP Datasheet PDF : 68 Pages
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TL03x, TL03xA
ENHANCED-JFET LOW-POWER LOW-OFFSET
OPERATIONAL AMPLIFIERS
SLOS180C FEBRUARY 1997 REVISED DECEMBER 2001
APPLICATION INFORMATION
low-level light-detector preamplifier
Applications that need to detect small currents require high input-impedance operational amplifiers; otherwise,
the bias currents of the operational amplifier camouflage the current being monitored. Phototransistors provide
a current that is proportional to the light reaching the transistor. The TL03x allows even the small currents
resulting from low-level light to be detected.
In Figure 68, if there is no light, the phototransistor is off and the output is high. As light is detected, the
operational amplifier output begins pulling low. Adjusting R4 both compensates for offset voltage of the amplifier
and adjusts the point of light detection by the amplifier.
15 V
R1
10 k
TIL601
R6
10 k
R3
R4
10 k
10 k
C1
100 pF
R7
10 k
R5 10 k
R2 5 k
+ TL03x
VO
15 V
Figure 68. Low-Level Light-Detector Preamplifier
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
47
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