AK2573A Datasheet, PDF (1/38 Pages) Asahi Kasei Microsystems – 125M / 156M Laser Diode Driver + APC

ASAHI KASEI
[AK2573A]
AK2573A
125M / 156M Laser Diode Driver + APC
Features
- 1 chip 125M / 156M Laser Diode Driver (LDD) +
Digital APC (APC_FF and APC_FB)
- Programmable laser BIAS and modulation current
controlled by an on-chip temperature sensor
(APC_FF)
- Digital feedback circuit for APC (APC FB)
- Two current output 8 bit DACs,
I-DAC1: 85mA sink for modulation current
I-DAC2: 54mA sink for BIAS current
- TXFAULT detection and 1kbit ID Field (EEPROM)
for SFP (Small Form-factor Pluggable) support
- I²C^TM compatible digital I/F
- Duty adjustment
- Power failure alarm (OPTALM), Over current alarm
(CURRALM), Temperature alarm (TEMPALM),
Data alarm (DATAALM) and TXFAULT for failure
alarm
- BIAS and modulation current monitors (* 0.0095)
- Single 3.3V +/- 0.2V operation
Description
The AK2573A is a 1chip LDD (Laser Diode Driver) and
an APC (Auto Power Control) for laser direct
modulation application. It contains up to 156M LDD,
programmable duty adjustment, BIAS and modulation
currents, a digital feedback circuit, BIAS and
modulation current monitors, failure alarms, I²C^TM
interface, an EEPROM for storing LD characteristics
and user information, and TXFAULT detection for SFP
application. The AK2573A has two APC functions;
APC FF (Feed-forward) and APC FB (Feedback). APC
FF supplies a programmed current in response to the
temperature. APC FB provides a stable auto power
control function with an internal digital feedback
algorithm.
All program and operational functions can be set
through the I²C^TM compatible interface and stored in the
on-chip EEPROM.
Ordering Information
Applications
STM-1 / OC-3 (156Mbps) Optical Interface Module
TS–1000 (125Mbps) Optical Interface Module
Product Number
PKG
AK2573AVB BCC++ 48 (7mm * 7mm)
I²C^TM is a trademark o f Philips Corporation.
Block Diagram
SEL
DATAP
DATAN
CLKP
CLKN
DATA
(LVPECL)
CLK
(LVPECL)
TEMPSENS
TEMPMON
Monitor
PD
PDMON
RPD
PDIN
PDGAIN
CPD
BIAS
RB (12k)
BIAS_GEN
DUTY_
ADJ
FF
DRIVER
IMODN
LD
IMOD
Imod
OSC
ADC
EEPROM
Digital I/F
SCL SDA* WP**
I-DAC1
* 0.0095
MODMON
APC
I-DAC2
ALM
SHUTDOWN
CONTROL
* 0.0095
Ibias
IBIAS
BIASMON
DATAALM
OPTALM
CURRALM
TEMPALM
TXFAULT*
TXDIS1
TXDIS2
*: Open Drain
**: Pull-up
<MS0189-E-01>
-1-
2004/5