ADPD105BCPZ datasheet(39/66 Pages) AD

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Data Sheet

ADPD105/ADPD106/ADPD107

Rev. A | Page 39 of 66

OPTIMIZING POWER BY DISABLING UNUSED

CHANNELS AND AMPLIFIERS

Single-Channel AFE Mode

When using a single photodiode in an application, with that

photodiode connected to a single AFE channel (either Channel 1

or Channel 2), the ADPD105/ADPD106/ADPD107 have an

option to power down the unused channels, placing the device in

single AFE channel mode. Because three of the four AFE channels

are turned off in this mode, the power consumption is considerably

reduced.

If only Channel 1 is being used, disable Channel 2, Channel 3, and

Channel 4 by writing 0x7 to Register 0x3C, Bits[8:6]. If only

Channel 2 is being used, disable Channel 1 by writing 0x7 to

by writing 0x7 to Register 0x37, Bits[15:13].

Dual-Channel AFE Mode

In situations where two of the four channels are in use, the

other two channels can be disabled. Enable Channel 1 and

Channel 2 (with Channel 3 and Channel 4 disabled) by writing

0x7 to Register 0x37, Bits[15:13]. Operate Channel 3 and Channel 4

in dual channel mode (with Channel 1 and Channel 2 disabled)

by writing 0x7 to both Register 0x3C, Bits[5:3] and Register 0x37,

Bits[12:10].

Three-channel mode can also be achieved with the appropriate

settings. See Table 25 for the settings required to power down

different combinations of channels. Refer to the Time Slot

Switch section to determine the different combinations of the

PDx inputs and enabled channels required to optimize the

system configuration for maximum SNR and lowest power.

Table 25. Channel Power-Down Settings

Number of Channels

Channels Enabled

Bits[8:6]

Bits[5:3]

Bits[15:13]

Bits[12:10]

Channel 1

0x7

0x0

Not applicable

Channel 2

0x0

0x7

0x0

Channel 1, Channel 2

0x0

0x7

0x0

Channel 3, Channel 4

0x0

0x7

0x0

0x7

Channel 2, Channel 3, Channel 4

0x0

0x7

0x0

All channels

0x0

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