AK2573A Datasheet, PDF (5/38 Pages) Asahi Kasei Microsystems – 125M / 156M Laser Diode Driver + APC

ASAHI KASEI
[AK2573A]
Pin Description (Continued)
PIN# Symbol
Function
I/O
20 TEMPALM Sets the alarm when detects the over temperature.
Do
The polarity can be set with EEPROM.
21 TEMPMON Temperature sensor monitor output.
Ao
22 BIAS
BIAS reference for internal circuit. Connect to VSS with 12k +/- Ao
1% resistor.
23
PDMON
PDIN regulated output. Adjust PDGAIN to PDMON = 1V Ao
(typ).
24 AVSS
VSS for analog circuit.
PWR
25 AVDD
Power supply for analog circuit. Connect to the power supply PWR
through R-C LPF (R=10Ω, C=1uF is recommended).
26 PDIN
Monitor PD voltage input. Monitor PD current is converted to Ai
the voltage with resistor and capacitor that has 1kHz to 10kHz
cut-off frequency.
27 VSSBI
VSS for BIAS current drive circuit.
PWR
28 IBIAS
BIAS current output. Sinks up to 54mA (typ) current.
Ao
29
BIAS current is adjusted with I-DAC2.
IBIAS voltage should be (VDD – 1.8V) or more.
30 VSSBI
VSS for BIAS current drive circuit.
PWR
31 VSSMD
VSS for MOD current drive circuit.
PWR
32 IMOD
Positive MOD current output.
Ao
33
Sinks up to 85mA (typ) MOD current when input data is “H”.
MOD current is adjusted with I-DAC1.
IMOD voltage should be (VDD – 1.8V) or more.
34 IMODN
Negative MOD current output.
Ao
35
Sinks MOD current when input data is “L”.
36 VSSMD
VSS for MOD current drive circuit.
PWR
37 VDDMD Power supply for MOD current circuit.
PWR
38 NC
No Connection. Connect to the VSS or leave open
39 VDDDR
Power supply for MOD driver circuit.
PWR
40 VSSDR
VSS for MOD driver circuit.
PWR
41 BIASMON BIAS monitor current output.
Ao
Sources 0.0095 times current of I-DAC2 (BIAS) current.
BIASMON voltage should be 1.3V or less.
42 MODMON MOD Monitor current output.
Ao
Sources 0.0095 times current of I-DAC1 (modulation) current.
BIASMON voltage should be 1.3V or less.
43 TEST1
Test input. Connect to VSS for normal operation
Di
44 TEST2
Test input. Connect to VSS for normal operation
Di
45 TEST3
Test input. Connect to VSS for normal operation
Di
46 TEST4
Test input. Connect to VSS for normal operation
Di
47 TEST5
Test input. Connect to VSS for normal operation
Di
48 TEST6
Test input. Leave open for normal operation.
Do
Remark
AC Load
≤ 30pF
AC load
≤ 30pF
DC load
≥ 50kΩ
AC load
≤ 30pF
DC load
≥ 50kΩ
Connect to
VSS.
Leave open
Center PAD of PKG should be connected to the VSS for good electrical performanceand radiation of heat.
<MS0189-E-01>
-5-
2004/5