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ADPD103

Data Sheet

Rev. B | Page 14 of 52

TIME SLOT SWITCH

Up to eight photodiodes (PD1 to PD8) can be connected to the

ADPD103. The photodiode anodes are connected to the PD1 to

PD8 input pins; the photodiode cathodes are connected to the

cathode pin, PDC. The anodes are assigned in three different

configurations depending on the settings of Register 0x14 (see

Figure 11, Figure 12, and Figure 13).

Aswitch sets which photodiode group is connected during Time

Slot A and Time Slot B. See Table 13 for the time slot switch

registers. When using less than eight photodiodes, it is important

to leave the unused inputs floating for proper operation of the

device. The photodiode inputs are current inputs and as such, these

pins are also considered to be voltage outputs. Tying these inputs to

a voltage may saturate the analog block.

CH1

PD1

PD2

PD3

PD4

PD5

PD6

PD7

PD8

INPUT CONFIGURATION FOR

CH2

CH3

CH4

Figure 11. PD1 to PD4 Connection

INPUT CONFIGURATION FOR

CH1

PD1

PD2

PD3

PD4

PD5

PD6

PD7

PD8

CH2

CH3

CH4

Figure 12. PD5 to PD8 Connection

INPUT CONFIGURATION FOR

CH1

PD1

PD2

PD3

PD4

PD5

PD6

PD7

PD8

CH2

CH3

CH4

Figure 13. 2-to-1 PD Current Summation

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