AK2574 Datasheet, PDF (1/30 Pages) Asahi Kasei Microsystems – 156M Laser Diode Driver + APC for Burst Mode

ASAHI KASEI
[AK2574]
AK2574
156M Laser Diode Driver + APC for Burst Mode
Features
- 156M Laser Diode Driver for burst mode application
- BIAS current switching
- Programmable laser BIAS and modulation current
controlled by an on-chip temperature sensor
(APC_FF)
- Two current output 8 bit DACs,
I-DAC1: 85mA sink for modulation current
I-DAC2: 54mA sink for BIAS current
- Power failure alarm (TXACT), CLK failure alarm
(CLKALM)
- I²C^TM compatible digital I/F
- Duty adjustment
- Single 3.3V +/- 0.2V operation
Applications
ITU-T G.983 ATM-PON ONU
I²C^TM is a trademark o f Philips Corporation.
Description
The AK2574 is a 1chip LDD (Laser Diode Driver) and
an APC (Auto Power Control) for burst mode
application such as ATM-PON. It contains not only
156M LDD for modulatin current but also BIAS
current switching, programmable BIAS and
modulation currents, duty adjustment, I²C^TM interface,
an EEPROM for storing LD characteristics and user
information.
The AK2574 has an APC FF (Feed-forward) function
that supplies a programmed current in response to the
temperature.
All program and operational functions can be set
through the I²C^TM compatible interface and stored in the
on-chip EEPROM.
Ordering Information
Product Number
PKG
AK2574VB BCC++ 48 (7mm * 7mm)
Block Diagram
DATAP
DATAN
DATA
(LVPECL)
data
SEL
data_ff
FF
AND
DUTY_
ADJ
CLKP
CLKN
CLK
clk
(LVPECL)
CLK_
DET
BRSTP
BRSTN
BRST
brst
FF
(LVPECL)
brst_ff
Monitor
PD
i_pd
PDIN
SEL
DAC
(TXACT)
txact_ref
COMP
(TXACT)
comp_out
SET/
RESET
LD
IMODN
IMOD
MOD
DRIVER
Imod
IBIAS
IBIASR1
330Ω
BIAS
DRIVER
IBIASC1
IBIASC2
0.1uF
Ibias
0.1uF
AND
CLKALM
TXACT
RPD
TEMPMON
TEMPSENS
BIAS
RB (12k)
BIAS_
GEN
ADC
OSC
APC_FF
I-DAC1
I-DAC2
EEPROM
Digital I/F (I ²C^TM)
SCL SDA*
WP**
CONTROL
TXDIS
*: Open Drain
**: Pull-up
<MS0266-E-00>
-1-
2003/12