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db05175e_V3.01_preliminary_2017-07-06

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AS89000

V3.01

6 APPLICATIONS

6.1 Connection of ams Sensors Germany Color Sensor

Figure 5: Circuit for the conversion of sensor’s photo current to an equivalent voltage by using the amplifier AS89000

Opposite figure shows a circuit for the conversion of sensor’s photo current to an equivalent voltage by

using the amplifier AS89000. The resulted voltage can be processed e.g. with an ADC. By the selection of

suitable resistors/amplifying stage the output voltage range can be adjusted to the photo current value by

programming the pin-programmable transimpedance amplifier AS89000.

6.2 Temperature Compensation of AS89000 via Reference Method

The following description shows a possible approach for reduction the temperature dependency of amplifier

via reference channel (use the 4th channel of AS89000).

Figure 6: Possible approach for reduction the temperature dependency of amplifier via reference channel

Photo

Out

x

I

V

R 