AK8456 Datasheet, PDF (16/32 Pages) Asahi Kasei Microsystems – 3 channel input 16bit 30MSPS Video ADC with LED driver

 LED Driver Switching Characteristics
[AK8456]
(Unless otherwise specified, AVDD=OVDD=3.0V~3.6V, LVDD=4.5V~5.7V, Ta=0~70C)
Item
Symbol Conditions
min. typ. max. Unit
LEDEN_R/G/B Setup Time
tlens
15
ns
(to SHD)
LEDED_R/G/B Hold Time
tlenh
15
ns
(to SHD)
LEDEN_R/G/B
SHD
0.7AVDD
tlenh tlens
0.3AVDD
0.7AVDD
tlenh
Fig. 15 LED driver switching characteristics
0.3AVDD
tlens
(Unless otherwise specified, AVDD=OVDD=3.0V~3.6V, LVDD=4.5V~5.7V, Ta=0~70C)
Item
Symbol Conditions
min. typ. max. Unit
LED Current Rise Time tlon
10
s
LED Current Fall Time
tloff
10
s
LEDEN_R/G/B
SHD
LED_R/G/B Current
0.3AVDD
90%
0.3AVDD
10%
tlon
tloff
Fig. 16 LED current timing
LED drivers are switched in LEDEN_R/G/B those are synchronized with SHD falling edge. Therefore,
if it can’t meet setup time or hold time of LEDEN_R/G/B, LED lighting time will be 1~2 pixels
change.
014002433-E-00
- 16 -
2014/06