TL032ACDR datasheet(47/63 Pages) TI

47 / 63 page

TL03x, TL03xA

ENHANCED-JFET LOW-POWER LOW-OFFSET

OPERATIONAL AMPLIFIERS

SLOS180C – FEBRUARY 1997 – REVISED DECEMBER 2001

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

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.

TL03x

–

10 k

Ω

100 pF

TIL601

5 k

Ω

10 k

Ω

10 k

Ω

10 k

Ω

10 k

Ω

10 k

Ω

15 V

–15 V

Figure 68. Low-Level Light-Detector Preamplifier

TL032ACDR 数据表(PDF) 47 Page - Texas Instruments

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