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