ADPD4100 datasheet(4/101 Pages) AD

4 / 101 page

ADPD4100/ADPD4101

Data Sheet

Rev. 0 | Page 4 of 101

PERFORMANCE SPECIFICATIONS

AVDD = DVDDx = IOVDD = 1.8 V, TA = full operating temperature range, unless otherwise noted.

Table 3.

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

DATA ACQUISITION

Datapath Width

Bits

FIRST IN, FIRST OUT (FIFO) SIZE

512

Bytes

LED DRIVER

LED Peak Current per Driver

LED pulse enabled

1.5

200

LED Peak Current, Total

Using multiple LED drivers simultaneously

400

Driver Compliance Voltage

For any LED driver output at LED_CURRENTx_x = 0x7F

300

LEDxx Pin Voltage1

3.6

Highest LED Peak Current per Driver2

For any LED driver at LED_CURRENTx_x = 0x7F

176

200

208

LED PERIOD

AFE width = 4 µs3

µs

AFE width = 3 µs

µs

SAMPLING RATE4

Single time slot, four data bytes to FIFO, 2 µs LED pulse

0.004

9000

OSCILLATOR DRIFT

32 kHz Oscillator

Percent variation from 25°C to 85°C

Percent variation from +25°C to −40°C

−8.5

1 MHz Oscillator

Percent variation from 25°C to 85°C

Percent variation from +25°C to −40°C

−4

32 MHz Oscillator

Percent Variation from 25°C to 85°C

Percent Variation from +25°C to −40°C

−1.5

LEDxx refers to LED1A, LED2A, LED3A, LED4A, LED1B, LED2B, LED3B, and LED4B.

The maximum value in this specification is the maximum value at LED driver current setting = 0x7F on LED Driver LED1A, and the minimum value in this specification

is the minimum value at LED driver current setting = 0x7F on LED Driver LED4B. Typically, the LED peak current is the highest on LED1A and the lowest on LED4B,

while the rest of the drivers fall in between, and the LED peak current of the LEDxA drivers are higher than that of LEDxB drivers of the same number. For example, the

LED peak current of LED3A is higher than that of LED3B.

Minimum LED period = (2 × AFE width) + 3 µs.

The maximum value in this specification is the internal ADC sampling rate using the internal 1 MHz state machine clock. The I2C and SPI read rates in some

configurations may limit the ODR.

Table 4.

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

TRANSIMPEDANCE AMPLIFIER (TIA) GAIN

12.5

200

kΩ

PULSED SIGNAL CONVERSIONS, 3 μs LED

PULSE

4 μs integration width, continuous connect mode

ADC Resolution1

TIA feedback resistor

12.5 kΩ

6.2

nA/LSB

25 kΩ

3.1

nA/LSB

50 kΩ

1.5

nA/LSB

100 kΩ

0.77

nA/LSB

200 kΩ

0.38

nA/LSB

ADC Saturation Level2

TIA feedback resistor

12.5 kΩ

μA

25 kΩ

μA

50 kΩ

12.5

μA

100 kΩ

6.22

μA

200 kΩ

3.11

μA

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