AK2574 Datasheet, PDF (4/30 Pages) Asahi Kasei Microsystems – 156M Laser Diode Driver + APC for Burst Mode

ASAHI KASEI
[AK2574]
Ⅰ. Pin Description
The symbol of I/O column 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_od: Digital input / output (open drain)
PWR: Power or VSS
PIN# Symbol
1
SDA
2
NC
3
SCL
4
CLKALM
5
TXDIS
6
WP
7
CLKN
8
CLKP
9
SEL
10 DATAN
11 DATAP
12, 13 NC
14 TEST6
15 BRSTN
16 BRSTP
17 TEST5
18 TEST4
19 TEST3
20 TEST2
21 VSSDR
22 VDDDR
23 VDDMD
24 VSSMD
25, 26 NC
Function
I/O
Serial data input / output (Open drain). Connect to VDD with 4.7k Dio_od
to 10kΩ resistor.
No Connection. Connect to the VSS (recommended) or leave open.
Serial clock input. The data (SDA) is shifted in at the rising edge of Di
SCL and is shifted out at the falling edge of SCL.
Sets the alarm when detects 1’s or 0’s sequential clock input. Do
During CLKALM detection, the AK2574 goes into “TX disable”.
The detection time is 100ns (typ). The CLKALM is reset when 1
clock is detected. The polarity can be set with EEPROM.
When SEL=”L”, CLKALM is set “non-detected” polarity.
TX Disable.
Di
The polarity can be set with EEPROM. When set “TX disable”,
IMOD and IBIAS are Hi-Z. Use 4.7kΩ or more for externally
pulled-up or pulled-down.
Write Protect. Internally pulled-up with 20kΩ (typ).
Di_pu
“H” sets device address 101000 and only user area of EEPROM
can be accessed as read-only. “L” sets device address as 1010 and
full of EEPROM can be accessed as read/write.
Negative LVPECL clock input. Input Impedance >= 10kΩ.
Ai_l
Connect to VSS when SEL = “L”.
Positive LVPECL clock input. Input Impedance >= 10kΩ.
Ai_l
Connect to VDD or leave open when SEL =“L”.
“H” for latched data with clock. DATA (DATAP – DATAN) and Di
BRST (BRSTP – BRSTN) are shifted into the falling edge of CLK.
(CLKP – CLKN).
“L” for direct data.
Negative LVPECL data input. Input Impedance >= 10kΩ
Ai_l
Positive LVPECL data input. InputImpedance >= 10kΩ
Ai_l
No Connection. Connect to the VSS or leave open.
Test input. Leave open for normal operation.
Do
Negative LVPECL burst control input.
Ai_l
Input Impedance >= 10kΩ
Positive LVPECL burst control input.
Ai_l
Input Impedance >= 10kΩ
Test input. Connect to VSS for normal operation
Di
Test input. Connect to VSS for normal operation
Di
Test input. Connect to VSS for normal operation
Di
Test input. Connect to VSS for normal operation
Di
VSS for MOD driver circuit.
PWR
Power supply for MOD driver circuit.
PWR
Power supply for MOD current circuit.
PWR
VSS for MOD current drive circuit.
PWR
No Connection. Connect to the VSS (recommended) or leave open.
Remark
AC load
≤ 100pF
Do not
leave open
AC load
≤ 30pF
Do not
leave open
Do not
leave open
Leave open
Connect to
VSS.
<MS0266-E-00>
-4-
2003/12