ADPD107 datasheet(20/66 Pages) AD

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ADPD105/ADPD106/ADPD107

Data Sheet

Rev. A | Page 20 of 66

TIME SLOT SWITCH

ADPD105 LFCSP Input Configurations

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

ADPD105 in the LFCSP package. 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 22, Figure 23, and Figure 21).

A switch sets which photodiode group is connected during Time

Slot A and Time Slot B. See Table 17 for the time slot switch

registers. It is important to leave any unused inputs floating for

proper operation of the devices. 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 19. PD1 to PD4 Connection

INPUT CONFIGURATION FOR

CH1

PD1

PD2

PD3

PD4

PD5

PD6

PD7

PD8

CH2

CH3

CH4

Figure 20. PD5 to PD8 Connection

INPUT CONFIGURATION FOR

CH1

PD1

PD2

PD3

PD4

PD5

PD6

PD7

PD8

CH2

CH3

CH4

Figure 21. 2 to 1 PD Current Summation

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