AK2574 Datasheet, PDF (8/30 Pages) Asahi Kasei Microsystems – 156M Laser Diode Driver + APC for Burst Mode

ASAHI KASEI
[AK2574]
5. LVPECL I/F (CLKP, CLKN, DATAP, DATAN, BRSTP, BRSTN)
Item
Symbol min
typ
Single-ended Input Voltage Swing Vamp
0.1
Common Voltage
Vcom 0.5*VDD
BIAS Voltage
Vbias
0.6*VDD
Input Impedance
Zin
10
max
1.2
VDD – 1.0
Unit Remarks
V
V
V
kΩ
Vcom
CLKP/CLKN
DATAP/DATAN
BRSTP/BRTSTN
Vamp
6. BRST Timing (SEL=”L”, without CLK)
Item
Symbol Conditions min typ max Unit Remarks
Delay Time of BRST “L” → “H” Tdr-bd
12.8
ns
to First DATA
Delay Time of Last DATA
to IBIAS OFF
Tdf-di Last Data=1
R_DAC2=0Fh
2
ns
IBIAS Overshoot
rib1 R_DAC2=0Fh
120 150
% Note 1
R_DAC2=2Fh
108
%
R_DAC2=FFh
98
%
IBIAS Error before 2ns
of First DATA
rib2 R_DAC2=0Fh
+/- 15 % Note 1
Delay Time of BRST “H”→”L” Tdf-bt R_DAC2=0Fh
16
ns
to TXACT OFF
Delay Time of First DATA
Tdr-dt
Note 2
to TXACT Detection
Note 1: This parameter is characterized and is not 100% tested.
Note2:DependsonTXACTdetectionlevel,MonitorPDcurrent,etc. Formoreinformation,see “VI.3.1TXACT”.
BRSTP - BRSTN
DATAP - DATAN
IBIAS Current
IMOD Current
TXACT
Tdr-bd
rib1
100% Nominal
rib2
2ns
Tdr-dt
Tdf-di
Tdf-bt
<MS0266-E-00>
-8-
2003/12