Datasheet

ManualsBrandsAnalog Devices ManualsADC - Analog to DigitalAnalog Front End IC 14bit LFCSP-

ADPD1080/ADPD1081 Data Sheet

Rev. B | Page 60 of 74

Address Data Bit

Default

Value Access Name Description

0x31 [15:8] 0x08 R/W SLOTA_PULSES LED Time Slot A pulse count. n

: number of LED pulses in

Time Slot A.

[7:0] 0x18 R/W SLOTA_PERIOD LED Time Slot A pulse period (in 1 µs step).

0x34 [15:10] 0x00 R/W Reserved Write 0x0.

9 0x0 R/W SLOTB_LED_DIS Time Slot B LED disable. 1: disables the LED assigned to Time Slot B.

pulsing current to the LEDs. Disabling both LEDs via this register is

often used to measure the dark level.

Use Register 0x11 instead to enable or disable the actual time slot

usage and not only the LED.

8 0x0 R/W SLOTA_LED_DIS Time Slot A LED disable. 1: disables the LED assigned to Time Slot A.

Use Register 0x11 instead to enable or disable the actual time slot

usage and not only the LED.

[7:0] 0x00 R/W Reserved Write 0x00.

0x35 [15:13] 0x0 R/W Reserved Write 0x0.

[12:8] 0x3 SLOTB_LED_WIDTH LED pulse width (in 1 µs step) for Time Slot B.

[7:0] 0x20 SLOTB_LED_OFFSET LED offset width (in 1 µs step) for Time Slot B.

0x36 [15:8] 0x08 R/W SLOTB_PULSES LED Time Slot B pulse count. n

: number of LED pulses in Time Slot B.

[7:0] 0x18 R/W SLOTB_PERIOD LED Time Slot B pulse period (in 1 µs step).

AFE CONFIGURATION REGISTERS

Table 38. AFE Global Configuration Registers

Address Data Bit

Default

Value Access Name Description

0x37 [15:13] 0x0 R/W CH34_DISABLE Power-down options for Channel 3 and Channel 4 only.

Bit 13: power down Channel 3, Channel 4 TIA op amp.

Bit 14: power down Channel 3, Channel 4 BPF op amp.

Bit 15: power down Channel 3, Channel 4 integrator op amp.

[12:10] 0x0 R/W CH2_DISABLE Bit 10: power down Channel 2 TIA op amp.

Bit 11: power down Channel 2 BPF op amp.

Bit 12: power down Channel 2 integrator op amp.

[9:8] 0x0 R/W SLOTB_PERIOD 8 MSBs of LED Time Slot B pulse period.

[7:2] 0x000 R/W Reserved Write 0x000.

[1:0] 0x0 R/W SLOTA_PERIOD 8 MSBs of LED Time Slot A pulse period.

0x3C [15:14] 0x0 R/W Reserved Write 0x0.

[13:11] 0x6 R/W Reserved Write 0x6.

10 0x0 R/W Reserved Reserved.

9 0x0 R/W V_CATHODE 0x0: 1.3 V (identical to anode voltage).

0x1: 1.8 V (reverse bias photodiode by 550 mV). This

setting may add noise.

[8:3] 0x00 R/W AFE_POWERDOWN AFE channels power-down select.

0x0: keeps all channels on.

Bit 3: power down Channel 1 TIA op amp.

Bit 4: power down Channel 1 BPF op amp.

Bit 5: power down Channel 1 integrator op amp.

Bit 6: power down Channel 2, Channel 3, and Channel 4

TIA op amp.

Bit 7: power down Channel 2, Channel 3, and Channel 4

BPF op amp.

Bit 8: power down Channel 2, Channel 3, and Channel 4

integrator op amp.

[2:0] 0x6 R/W Reserved Write 0x6.

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