AK2572 Datasheet, PDF (47/50 Pages) Asahi Kasei Microsystems – APC for Burst Mode Applicable Direct Modulation Laser Diode

ASAHI KASEI
Ⅵ. EXTERNAL CIRCUIT EXAMPLE
Recommended External Circuit
[AK2572]
Voltage Output
(VDAC3)
Cvout
LDD
Rvout
Current
Output
(IDAC1)
C14 C24
LD
Current
Output
C13
(IDAC2)
C23
R11
Extalm1
Extalm2/Mod_ctrl
Open
PDMON
TEMPMON
BIAS
AK2572 ^EXTALM1
EXTALM2/MOD_CTRL
TEST4
WP
BIASMON
PDIN
AVSS
AVDD
TXDIS
BURST
SCL
VDD=3.3V[typ]
Monitor PD
Cpd Rpd
Current Output
(BIASMON)
LDD
C22 C12
R23
Tx_disable
Burst
Mod_def1
* When Write Protect is Released :
WP-pin is left Open or connected
to DVDD (Set R_WP_CTRL='0')
* When Write Protect is Established :
WP-pin is left Open (Set R_WP_CTRL='1')
or connected to DVSS
C21
C11
VSS=0V
R21
R22
Mod_def2
Tx_fault
R11=12kΩ±1%
fpd=1/(2π*Rpd*Cpd)=5kHz～10kHz
R21=R22=R23=4.7kΩ～10kΩ
Rvout=1kΩ
C11=C12=C13=C14=0.1μF
Cvout=0.01μF
C21=C22=C23=C24=0.01μF or 0.001μF
Connection of Unused pins :
BURST=VSS EXTALM1=VSS
TXDIS=VSS EXTALM2/MOD_CTRL=VSS
PDIN=VSS
-47-
< MS0290-E-01>
2004/8