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