AK2574VB AKM [Asahi Kasei Microsystems], AK2574VB Datasheet - Page 4

• Manufacturer Part Number: AK2574VB
• Description: 156M Laser Diode Driver + APC for Burst Mode
• Manufacturer: AKM [Asahi Kasei Microsystems]

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