Datasheet

LED1(IR LED)
ON signal
LED2(Red LED)
ON signal
t
LED
LED On-Time
d 0.25 T
Rx Sample Time = t
LED
± Settling Time
0 T
0.25 T 0.50 T 0.75 T
1.0 T
ADC Conversion
Pulse Repetition Period (PRP)
T = 1 / PRF
ADC Reset
ADC_RDY Pin
CONV
LED1_amb
,
Convert ambient sample
(LED1(IR) phase)
CONV
LED1
,
Convert LED1(IR) sample
CONV
LED2_amb
,
Convert ambient sample
(LED2(Red) phase)
CONV
LED2
,
Convert LED2(Red) sample
S
LED2
,
Sample LED2(Red)
S
LED2_amb
,
Sample Ambient
(LED2(Red) phase)
S
LED1
,
Sample LED1(IR)
S
LED1_amb
,
Sample Ambient
(LED1(IR) phase)
AFE4490
www.ti.com SBAS602F –DECEMBER 2012–REVISED OCTOBER 2013
NOTE: Programmable edges are shown in blue and red.
Figure 59. AFE Control Signals
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