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AS7038RB

Functional Description

Datasheet

• PUBLIC

DS000726

• v2-00 • 2021-Jun-02

126

│ 23

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6 Photodiodes

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4 with RED/IR filters (PD1, PD2 PD3 and PD4)

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1 with IR filter (PD B)

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1 clear (PD A) only connected to Light-to-Frequency block

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TIA

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Trans-Impedance Amplifier

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PREFILTER

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LP & HP Filter and variable Gain Stage

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Synchronous Demodulators

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SD_OFE1, SD_OEF2 with LP 6 HP filter and gain stage

The first Block in signals path is the TIA. The TIA converts the current from Photodiodes into a

voltage. The trans-impedance of TIA can be adjusted in 7 steps. After the TIA follow the PREFILTER.

PREFILTER includes a low pass filter with adjustable cut-off frequency, a high pass filter and a

variable gain stage. This block can be bypassed. The output signal of PREFILTER is used as input for

the blocks SD_OFE1 and SD_OFE2. These Block are identically built and can work in parallel. Both

consists of synchronous demodulator, a low-pass filter, a high pass filter and variable gain stage. The

sequencer does the control of the whole signal path, which is part of digital part.

In addition to these main blocks, there are two smaller blocks for detection of clipping signals inside

the blocks. The TIA Clip detection observes the output of TIA and SD Clip detection observe the

output of PREFILTER Block. The limits for clip detection can adjusted by digital part.

7.1.1

LED-Driver

The AS7038RB contain 4 identical LED driver circuits.

The LED-driver outputs can be controlled manually or by the built in sequencer. See section 7.1.8

Optical Front End Operating Modes

Information

The integration time tINT is defined either by the sequencer (man_mode=0) of manually

through the bit sw_itg if man_mode=1. For the synchronous demodulator only use the

resistive feedback.

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