AK2573A Datasheet, PDF (4/38 Pages) Asahi Kasei Microsystems – 125M / 156M Laser Diode Driver + APC

ASAHI KASEI
[AK2573A]
Ⅰ. Pin Description
The symbol of I/O row shows below.
Ai: Analog input, Ai_l: LVPECL input, Ao: Analog output
Di: Digital input, Di_pu: Digital input with pulled-up resistor, Do: Digital output, Dio: Digital input / output,
Do_od: Digital output (open drain), Dio_od: Didital input / output (open drain)
PWR: Power or VSS
PIN#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Symbol
NC
DATAP
DATAN
SEL
CLKP
CLKN
WP
TXDIS1
TXDIS2
DVDD
TXFAULT
NC
SDA
SCL
DVSS
NC
DATAALM
OPTALM
CURRALM
Function
I/O
No Connection. Connect to the VSS or leave open.
Positive LVPECL data input. Input Inpedance >= 10kΩ
Ai_l
Negative LVPECL data input. Input Indedance >= 10kΩ
Ai_l
“H” for latched data with clock. “L” for direct data.
Di
Positive LVPECL clock input. Connect to VSS when SEL =“L”. Ai_l
Negative LVPECL clock input. Connect to VDD or leave open Ai_l
when SEL = “L”.
Write Protect. Internally pulled-up with 20kΩ (typ).
Di_pu
“H” sets device address 101000 and only user area of EEPROM
can access as read-only. “L” sets device address as 1010 and full
of EEPROM can access as read/write. For more information, see
Table 8-2 and 9-1.
TX Disable.
Di
“H” for disable MOD and BIAS current. TXDIS1 and TXDIS2
are ORed internally. Use 4.7kΩ or more for externally pulled-up
or pulled-down.
Power supply for digital circuit.
PWR
TX Fault detection output (Open drain). Connect to VDD with Do_od
4.7kΩ to 10kΩ resistor.
Set “H” when detect TEMPALM, CURRALM, OPTALM or
DATAALM.
When set RE_SFP=1 and detect the ALM, TXFAULT is kept
“H” until receiving disable request at TXDIS1 or TXDIS2.
No Connection. Connect to the VSS or leave open.
Serial data input / output (Open drain). Connect to VDD with Dio_od
4.7k to 10k resistor.
Serial clock input. The data (SDA) is shifted in at the rising edge Di
of SCL and is shifted out at the falling edge of SCL.
VSS for digital circuit.
PWR
No Connection. Connect to the VSS or leave open.
Sets the alarm when detects 1’s or 0’s sequential data input. The Do
detection time is 4.5us (typ).
The polarity can be set with EEPROM.
Sets the alarm when detects monitor PD current drop.
Do
The polarity can be set with EEPROM.
Sets the alarm when detects the over current of I-DAC1 or Do
I-DAC2.
Alarm level can be set every 6℃.
The polarity can be set with EEPROM.
Remark
Do not
leave open
Do not
leave open
AC load
≤ 100pF
AC Load
≤ 100pF
Do not
leave open
Do not
leave open
AC Load
≤ 30pF
AC Load
≤ 30pF
AC Load
≤ 30pF
<MS0189-E-01>
-4-
2004/5