AS7000 datasheet(40/92 Pages) AMSCO

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[v1-12] 2018-Feb-26

AS7000 − Detailed Description

Optical Signal Conditioning

Figure 52:

Optical Signal Conditioning

Synchronous Demodulator

An optional synchronous demodulator can be used to detect

small optical signals in the presence of large unwanted noise

(ambient light). Since the detector synchronizes to the LED

frequency, the demodulator can only be used of the

measurement sequencer is running.

It includes input filer (high pass at 200Hz, adjustable low pass)

and an 2nd order adjustable output low pass. The demodulator

itself multiplies the signal by +1 / 0 / -1 with a timing which is

controlled by the sequencer.

Note(s): The optical signal conditioning stage need sigref_

en=1 for operation.

High Pass Filter

An optional high pass filter can be used to remove unwanted

DC-components from the signal and allows further

amplification. In order to guarantee fast settling times of the

filter, four cutoff frequencies can be chosen.

Gain Stage

An optional gain stage can be used to amplify the signal after

the DC-component has been removed.

ADC

gain_byp

sd_byp

Synchronous Demodulator

Gain Stage

hp_byp

High Pass Filter

sd_bw

aa_freq

200Hz

sd_en

hp_freq

hp_en

gain_g

gain_en

from TIA

Sequencer

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