AK2573A Datasheet, PDF (13/38 Pages) Asahi Kasei Microsystems – 125M / 156M Laser Diode Driver + APC

ASAHI KASEI
[AK2573A]
3.1 LVPECL Input (DATAP / DATAN / CLKP / CLKN)
Table 3-2 shows LVPECL input characteristics. The AK2573A LVPECL input, which is biased to 0.6 * VDD with
10kΩ or more inpedance respectively, supports both AC and DC coupling. Fig 3-2 illustrates LVPECL input with AC
coupling and Fig3-3 illustrates with DC coupling respectively.
Table 3-2 LVPEL Interface characteristics
Item
Symbol min
typ
Single-ended Input Voltage |Vamp| 0.1
Swing
Common Voltage
Vcom 0.5*VDD
BIAS Voltage
Vbias
0.6*VDD
Input Impedance
Zin
10
Set-up Time
tsu
1.5
Hold Time
th
1.5
Note 1: This parameter is characterized and is not 100% tested.
max
1.2
VDD – 1.0
Unit
Remarks
V see Fig 3-1
V
V see Fig 3-2 and 3-3
kΩ
ns see Fig 3-4
ns Note 1
Fig 3-1 DATA / CLK Input Level
Vamp
Vcom
CLKP/CLKN
DATAP/DATAN
Fig 3-2 LVPECL input with AC coupling
AK2573A
0.01uF or more
Zin
Vbias
100Ω
0.01uF or more
DATAP
CLKP
Zin
DATAN
CLKN
Vbias
Fig3-3 LVPECL input with DC coupling
AK2573A
130Ω
82Ω
Zin
DATAP
DATAN
CLKP
CLKN
Vbias
Fig 3-4 Set-up & Hold Time
DATA
(DATAP -
DATAN)
tsu
th
CLK
(CLKP - CLKN)
<MS0189-E-01>
-13-
2004/5