ADPD4200 datasheet(26/93 Pages) AD

26 / 93 page

Data Sheet

ADPD4200

APPLICATIONS INFORMATION

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Rev. 0 | 26 of 93

Figure 25. Single Integration per ADC Conversion with LED as Stimulus

Table 16. Single Integration Mode Settings

Group

Time Slot A Register Address1

Bit Field Name

Description

Signal Path Setup

0x0100, Bits[13:12]

SAMPLE_TYPE_x

Leave at the default setting (0) for default

sampling mode.

0x0101, Bits[8:0]

AFE_PATH_CFG_x

Set to 0x0DA for TIA, BPF, integrator, and

ADC.

0x0102, Bits[15:12], 0x102, Bits[3:0]

INPxx_x

Enable desired inputs.

0x0103[14:12]

PRECON_x

Set to 0x5 to precondition anode of the

photodiode to TIA_VREF.

0x0103, Bits[7:6], 0x0103, Bits[1:0]

VCx_SEL_x

Set to 0x2 to set ~250 mV reverse bias

across the photodiode.

0x0104, Bits[5:0]

TIA_GAIN_CHx_x

Select TIA gain.

0x0104, Bits[9:8]

AFE_TRIM_VREF_x

Set to 0x3 to set TIA_VREF = 1.27 V for

maximum dynamic range.

0x0108, Bits[13:12]

MOD_TYPE_x

Set to 0 for continuous TIA connection to

inputs following preconditioning.

Timing

0x0109, Bits[7:0]

LED_OFFSET_x

Sets start time of first LED pulse in 1 μs

increments, and 0x10 is the default (16

μs).

0x0109, Bits[15:8]

LED_WIDTH_x

Sets width of LED pulse in 1 μs

increments, and 2 μs or 3 μs

recommended.

0x010A, Bits[4:0]

INTEG_WIDTH_x

Integration time in µs. Set to

LED_WIDTH_x + 1.

0x010B, Bits[12:0]

INTEG_OFFSET_x

Integration sequence start time

= INTEG_OFFSET_x. Optimize as

described in the Optimizing Position of

Integration Sequence section.

0x0107, Bits[15:8]

NUM_INT_x

Set to 1 for a single integration per group

of ADC conversions.

0x0107, Bits[7:0]

NUM_REPEAT_x

With NUM_INT_x = 1, NUM_REPEAT_x

sets the total number of pulses.

LED Settings

0x0105, Bit 15, 0x0105, Bit 7, 0x0106, Bit

15, 0x0106, Bit 7

LED_DRIVESIDEx_x

Select LED for time slot used.

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