ADPD1081 datasheet(20/74 Pages) AD

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ADPD1080/ADPD1081

Data Sheet

Rev. C | Page 20 of 74

TIME SLOT SWITCH

ADPD1080 LFCSP Input Configurations

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

the ADPD1080 for the LFCSP. 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 seven different configurations depending on the

settings of Register 0x14 (see Figure 18 through Figure 24).

Figure 18 through Figure 24 show multiple configurations

that can be used. The configuration selected depends on the

requirements of the application. Depending on the dynamic

range requirements of the application, 1-, 2-, or 4-channel

modes can be selected. There are also several modes where

input pins can be multiplexed together in cases where

photodiode currents must be summed.

See Table 16 for the time slot switch settings. 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 considered voltage outputs. Tying these inputs to

a voltage saturates the analog block.

INPUT CONFIGURATION FOR

CH1

PD3

PD1

CH2

PD4

PD2

Figure 18. PD1 to PD4 Connections with Register 0x14, Bits[11:8] and

Bits[7:4] = 1 for the LFCSP

INPUT CONFIGURATION FOR

CH1

PD7

PD5

CH2

PD8

PD6

Figure 19. PD5 to PD8 Connections with Register 0x14, Bits[11:8] and

Bits[7:4] = 2 for the LFCSP

INPUT CONFIGURATION FOR

CH1

PD1

PD3

PD2

PD4

Figure 20. PD1 to PD4 Connections with Register 0x14, Bits[11:8] and

Bits[7:4] = 3 for the LFCSP

CH1

PD5

PD6

PD7

PD8

INPUT CONFIGURATION FOR

CH2

CH3

CH4

Figure 21. PD5 to PD8 Connections with Register 0x14, Bits[11:8] and

Bits[7:4] = 4 for the LFCSP

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