Datasheet
ADPD1080/ADPD1081 Data Sheet
Rev. B | 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.
16110-018
INPUT CONFIGURATION FOR
REGISTER 0x14[11:8] = 1
REGISTER 0x14[7:4] = 1
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
16110-019
INPUT CONFIGURATION FOR
REGISTER 0x14[11:8] = 2
REGISTER 0x14[7:4] = 2
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
16110-020
INPUT CONFIGURATION FOR
REGISTER 0x14[1
1:8] = 3
REGISTER 0x14[7:4] = 3
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
REGISTER 0x14[11:8] = 4
REGISTER 0x14[7:4] = 4
CH2
CH3
CH4
16110-021
Figure 21. PD5 to PD8 Connections with Register 0x14, Bits[11:8] and
Bits[7:4] = 4 for the LFCSP
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