ADPD4200 datasheet(33/93 Pages) AD

33 / 93 page

Data Sheet

ADPD4200

APPLICATIONS INFORMATION

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Rev. 0 | 33 of 93

Figure 30. Timing Diagram for Pulse Connect Modulation

Figure 31. Timing Diagram for Modulate Stimulus Operation

Table 20. Modulate Stimulus Settings

Group

Time Slot A Register Address1 Bit Field Name

Description

Modulate Stimulus Set-

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 0x0E6 for TIA, integrator, and ADC. Bypass BPF.

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

Bits[3:0]

INPxx_x

Enable desired inputs.

0x0103, Bits[14:12]

PRECON_x

Set to 0x5 to precondition sensor to TIA_VREF.

0x0103, Bits[11:10], 0x0103,

Bits[5:4]

VCx_PULSE_x

VCx pulse control. Set to 0x2 to pulse to the alternate voltage during a modulation

pulse.

0x0103, Bits[9:8], 0x0103,

Bits[3:2]

VCx_ALT_x

Select the alternate state for VCx during the modulation pulse.

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

Bits[1:0]

VCx_SEL_x

Set to 0x1 to set VCx to TIA_VREF as primary state.

0x0104, Bits[5:0]

TIA_GAIN_CHx_x

Select TIA gain.

0x0104, Bits[9:8]

AFE_TRIM_VREF_x

Set to 0x2 to set TIA_VREF = 0.9 V.

Modulate Stimulus Tim-

ing

0x010C, Bits[7:0]

MOD_OFFSET_x

Sets start time of first modulation pulse in 1 μs increments.

0x010C, Bits[15:8]

MOD_WIDTH_x

Sets width of modulation pulse in 1 μs increments. Typical values of 6 μs to 12 μs.

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