AS7058 datasheet(27/199 Pages) AMSOSRAM

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AS7058

Functional description

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DS001077 • v2-00 • 2025-Sep-24

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7.3

PPG ADC1 and ADC2

The PPG data acquisition signal path of AS7058 features two parallel synchronous current

input analog to digital converters. Both ADC channels shown in Figure 24 and Figure 25 do

provide same functionality and support true synchronous sampling of the assigned photodiode

inputs. Therefore, it is possible to read out two photodiodes in a single PPG subsample

measurement.

Figure 24: PPG ADC 1 signal path

Figure 25: PPG ADC 2 signal path

MOD 1

Current input

PPG ADC

1µA - 64µA; 20 Bit

Current DAC 1

Offset Compensation

8bit; 1µA- 128µA

PDREF

PDx

PDx_MUX

PDREF

MOD1

MOD2

Digital Sequencer

Offset Control Signal

AAOC

Bitstream to

Decimation filter

PDx

Decimation

Filters and post

processing

MOD 2

Current input

PPG ADC

1µA - 64µA; 20 Bit

Current DAC 2

Offset Compensation

8bit; 1µA- 128µA

PDREF

PDx

PDx_MUX

PDREF

MOD1

MOD2

Digital Sequencer

Offset Control Signal

AAOC

Bitstream to

Decimation filter

PDx

Decimation

Filters and post

processing

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