ADPD4100 datasheet(39/101 Pages) AD

39 / 101 page

Data Sheet

ADPD4100/ADPD4101

Rev. 0 | Page 39 of 101

PRECONDITION

LED

INTEGRATOR

SEQUENCE

ADC CONVERT

START OF TIME SLOT

LED_OFFSET_x

LED_WIDTH_x

TIA OUTPUT

BPF OUTPUT

INTEGRATOR

OUTPUT

NUM_REPEAT_x TIMES

–

NUM_INT_x

INTEG_OFFSET_x

INTEG_WIDTH_x

CALCULATED

PERIOD

PRE_WIDTH_x

(DEFAULT 8µs)

–

Figure 44. Multiple Integration Mode with LED as Stimulus

Table 23. Relevant Settings for Multiple Integration Mode

Group

Time Slot A

Bit Field Name

Description

Multiple Integration

Mode Using LED as

Stimulus

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[15:0]

INPxx_x

Enable desired inputs.

0x0103, Bits[14:12]

PRECON_x

Set to 0x5 to precondition anode of the photodiode to

TIA_VREF.

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

VCx_SEL_x

Set to 0x2 to set ~215 mV reverse bias across photodiode.

0x0104, Bits[5:0]

TIA_GAIN_CHx_x

Set the TIA gain to 200 kΩ.

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

0x0107, Bits[15:8]

NUM_INT_x

Set to a number that utilizes most of the dynamic range of

integrator available, leaving some margin for fluctuations in

input level.

0x0107, Bits[7:0]

NUM_REPEAT_x

Set NUM_REPEAT_x to the number of times to repeat the

multiple integration sequence. SNR increases by a factor of

√(NUM_REPEAT_x). Total number of pulses is equal to

NUM_REPEAT_x × NUM_INT_x.

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.

LED Settings

0x0105, Bit 15 and Bit 7;

0x0106, Bit 15 and Bit 7

LED_DRIVESIDEx_x

Select LED for time slot used.

0x0105, Bits[14:8], Bits[6:0];

0x0106, Bits[14:8], Bits[6:0]

LED_CURRENTx_x

Set LED current for selected LED.

Integrator Chop Mode

0x010D, Bits[7:4]

SUBTRACT_x

Four-pulse subtract pattern. Set to 1 to negate the math

operation in the matching position in a group of four pulses.

The LSB maps to the first pulse.

0x010D, Bits[3:0]

REVERSE_INTEG_x

Four-pulse integration reverse pattern. Set to 1 to reverse the

integrator positive and negative pulse order in the matching

position in a group of four pulses. The LSB maps to the first

pulse.

This is the Time Slot A register address. Add 0x020 for the identical register address for each subsequent time slot. For example, Register 0x0100 is the location for

SAMPLE_TYPE_A. For Time Slot B, this register is at Address 0x0120, For Time Slot C, this register is at Address 0x0140. For Time Slot D, this register is at

Address 0x0160, and so on.

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