AK2574 Datasheet, PDF (15/30 Pages) Asahi Kasei Microsystems – 156M Laser Diode Driver + APC for Burst Mode

ASAHI KASEI
[AK2574]
Table 2-2 LVPEL Interface characteristics
Item
Single-ended Input
Voltage Swing
Common Voltage
BIAS Voltage
Symbol min
typ
|Vamp| 0.1
Vcom 0.5*VDD
Vbias
0.6*VDD
Input Impedance
Zin
10
Set-up Time
Hold Time
tsu
1.5
th
1.0
Note 1: This parameter is characterized and is not 100% tested.
max
1.2
VDD – 1.0
Unit Reference
V Fig 2-2
V Fig 2-2
V Fig 2-3
kΩ Fig 2-3
ns Fig 2-4
ns Fig 2-4
Remarks
Note 1
Fig 2-2 DATA / CLK / BRST Input Level
Vamp
Vcom
CLKP/CLKN
DATAP/DATAN
BRSTP/BRTSTN
Fig 2-3 LVPECL input circuit
AK2574
130Ω
82Ω
Zin
DATAP
DATAN
CLKP
CLKN
BRSTP
BRSTN
Vbias
Fig 2-4 Set-up & Hold Time
DATA
(DATAP - DATAN)
tsu
th
CLK
(CLKP - CLKN)
2.2.2 Input Timing (SEL=”H”, in the case of the latched DATA with CLK)
BRST (BRSTP – BRSTN) and DATA (DATAP – DATAN) are shifted into AK2574 at the falling edge of CLK (CLKP
– CLKN). BIAS driver is turned on within 2 clock (12.8ns max) when BRST = 1. DATA input should be 2 clock (=
12.8ns min) behind BRST = 1. Fig 2-5 illustrates the timing example.
<MS0266-E-00>
-15-
2003/12