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PDF AK2573A Data sheet ( Hoja de datos )
| Número de pieza | AK2573A | |
| Descripción | 125M / 156M Laser Diode Driver APC | |
| Fabricantes | AKM | |
| Logotipo |  |
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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)
- DigitalfeedbackcircuitforAPC(APCFB)
- Twocurrentoutput8bitDACs,
I-DAC1: 85mA sink for modulation current
w w w . DI-DaACt 2:a54mS AhsinekfoerBtIA4ScuUrre.ntc o m
- TXFAULT detection and 1kbit ID Field (EEPROM)
for SFP (Small Form-factor Pluggable) support
- I2CTMcompatibledigitalI/F
- Dutyadjustment
- Power failurealarm (OPTALM), Over current alarm
(CURRALM), Temperature alarm (TEMPALM),
Data alarm (DATAALM) and TXFAULT for failure
alarm
- BIASandmodulationcurrentmonitors(*0.0095)
- Single3.3V+/-0.2Voperation
Description
TheAK2573Aisa 1chipLDD(LaserDiodeDriver)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, I2CTM
interface, an EEPROM for storing LD characteristics
and user information, and TXFAULT detection for SFP
application. The AK2573A has two APC functions;
APCFF (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 I2CTM compatible interface and stored in the
on-chipEEPROM.
OrderingInformation
Applications
STM-1 / OC-3 (156Mbps) Optical Interface Module
TS–1000 (125Mbps) Optical Interface Module
ProductNumber
PKG
AK2573AVB BCC++48(7mm*7mm)
I2CTM 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>
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2004/5
1 page  
ASAHI KASEI
[AK2573A]
Pin Description (Continued)
PIN#
20
Symbol
TEMPALM
Function
Sets the alarm when detects the over temperature.
The polarity can be set with EEPROM.
21 TEMPMON Temperaturesensormonitoroutput.
I/O
Do
Ao
22 BIAS
BIAS reference for internal circuit. Connect to VSS with 12k +/- Ao
1% resistor.
23 PDMON PDIN regulated output. Adjust PDGAIN to PDMON = 1V Ao
(typ).
24 AVSS
25 AVDD
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26 PDIN
27 VSSBI
28 IBIAS
29
30 VSSBI
31 VSSMD
32 IMOD
33
34 IMODN
35
36 VSSMD
37 VDDMD
38 NC
39 VDDDR
40 VSSDR
41 BIASMON
42 MODMON
43 TEST1
44 TEST2
45 TEST3
46 TEST4
47 TEST5
48 TEST6
VSS for analog circuit.
PWR
Power supply for analog circuit. Connect to the power supply PWR
throughR-CLPF(R=10Ω,C=1uFisrecommended).
Monitor PD voltage input. Monitor PD current is converted to Ai
the voltage with resistor and capacitor that has 1kHz to 10kHz
cut-off frequency.
VSS for BIAS current drive circuit.
PWR
BIAScurrentoutput. Sinks upto54mA(typ)current.
Ao
BIAS current is adjusted with I-DAC2.
IBIASvoltageshouldbe(VDD –1.8V)ormore.
VSS for BIAS current drive circuit.
PWR
VSS for MOD current drive circuit.
PWR
Positive MOD current output.
Ao
Sinksupto85mA(typ)MODcurrentwheninputdatais “H”.
MOD current is adjusted with I-DAC1.
IMODvoltageshouldbe(VDD –1.8V)ormore.
Negative MOD current output.
Ao
Sinks MOD current when input data is “L”.
VSS for MOD current drive circuit.
PWR
Power supply for MOD current circuit.
PWR
NoConnection. ConnecttotheVSSorleaveopen
Power supply for MOD driver circuit.
PWR
VSS for MOD driver circuit.
PWR
BIAS monitor current output.
Ao
Sources 0.0095 times current of I-DAC2 (BIAS) current.
BIASMON voltage should be 1.3V or less.
MOD Monitor current output.
Ao
Sources 0.0095 times current of I-DAC1 (modulation) current.
BIASMON voltage should be 1.3V or less.
Testinput. ConnecttoVSSfornormaloperation
Di
Testinput. ConnecttoVSSfornormaloperation
Di
Testinput. ConnecttoVSSfornormaloperation
Di
Testinput. ConnecttoVSSfornormaloperation
Di
Testinput. ConnecttoVSSfornormaloperation
Di
Testinput. Leaveopenfornormaloperation.
Do
Remark
AC Load
≤ 30pF
AC load
≤ 30pF
DC load
≥ 50kΩ
AC load
≤ 30pF
DC load
≥ 50kΩ
Connectto
VSS.
Leave open
Center PAD of PKG should be connected to the VSS for good electrical performanceand radiation of heat.
<MS0189-E-01>
-5-
2004/5
5 Page 
ASAHI KASEI
[AK2573A]
Ⅵ. Circuit Description
1. ParameterNotation
1.1 ParameterDefinition
In the AK2573A Circuit Description, in order to distinguish various pre-set parameter sources from EEPROM,
Registers or Device pins, “Identifier - Main name” notation is used as shown in Table 1-1. For ease of operational
description, small letters sometimes expresses internal signals.
Table1-1Parameter Definitions
Identifier
Register
R_
EEPROM
E_
Ether or both Register
or /and EEPROM
www.DataSheet4U.com
PIN
RE_
P_
BLOCK
None
InternalNode
None
MainName
REGISTERname
(AllCapital)
EEPROMname
(AllCapital))
REGISTER /
EEPROM name
(All Capital)
PINname
(All Capital)
BLOCKname
(All Capital))
signal name
(smallletter)
Remark
Example
Indicatesregister
R_APC_FB
R_DAC1
IndicatesEEPROM E_PDGAIN
E_DAC1_FF_TC
Indicateseitherregister RE_DAC1_GAIN
or EEPROM
RE_APC_TRGT
P_PDMON
I-DAC1
APC_COMP
vpd
1.2 OperationOverview
The AK2573A has 3 primary functions; 125M / 156M Laser diode driver part,APC (Automatic Power Control) part
which supplies adequate bias current and modulation current to a Laser Diode, and the Control part to control
operation modes of the AK2573A operation.
There are 3 operation modes in the AK2573A. Since each adjusting function is controlled through I2CTM Interface, it
realizes an automatic parameter adjustment.
(1) Self-runningMode
Self-running mode is ready for normal operation after all adjustments are completed. In this mode, temperature
detection, EEPROM access and feeding current are automatically performed using the on-chip oscillator. The
AK2573Aworks inthismodeafterpower-on.
(2) AdjustmentMode
Adjustment mode is designed for training the LD characteristics. The AK2573A operates according to the register
settingssetthrough theI2CTMI/F.
(3) EEPROMMode
EEPROM modeis used for storing LD characteristics into EEPROM via I2CTM I/F.
<MS0189-E-01>
-11-
2004/5
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK2573A.PDF ] | |
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