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PDF AK2574 Data sheet ( Hoja de datos )
| Número de pieza | AK2574 | |
| Descripción | 156M Laser Diode Driver APC | |
| Fabricantes | AKM | |
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Hay una vista previa y un enlace de descarga de AK2574 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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ASAHI KASEI
[AK2574]
AK2574
156M Laser Diode Driver + APC for Burst Mode
Features
- 156MLaserDiodeDriverforburstmodeapplication
- BIAScurrentswitching
- Programmable laser BIAS and modulation current
controlled by an on-chip temperature sensor
(APC_FF)
- Twocurrentoutput8bitDACs,
I-DAC1: 85mA sink for modulation current
I-DAC2: 54mA sink for BIAS current
w w w- P.owDer afailturea alSarmh (TeXAeCTt ),4CLUK .faiclureo almarm
(CLKALM)
- I2CTMcompatibledigitalI/F
- Dutyadjustment
- Single3.3V+/-0.2Voperation
Applications
ITU-T G.983 ATM-PON ONU
I2CTM 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, I2CTM 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 I2CTM compatible interface and stored in the
on-chip EEPROM.
Ordering Information
ProductNumber
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
(LVPECL)
brst
FF
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 2CTM)
SCL SDA*
WP**
CONTROL
TXDIS
*: Open Drain
**: Pull-up
<MS0266-E-00> -1- 2003/12
1 page  
ASAHI KASEI
[AK2574]
Pin Description (Continued)
PIN# Symbol
Function
I/O
27,28 IMODN
Negative MOD current output.
Sinks MOD current when input data is “L”.
Ao
29,30 IMOD
Positive MOD current output.
Sinks up to 85mA (typ) MOD current when input data is “H”.
MOD current is adjusted with I-DAC1.
IMODvoltageshouldbe(VDD –1.8V)ormore.
Ao
31 VSSMD VSSforMODcurrentdrivecircuit.
PWR
32 VSSBI
VSS for BIAS current drive circuit.
PWR
33,34 IBIAS
BIAScurrentoutput. Sinks upto54mA(typ)current.
BIAS current is adjusted with I-DAC2.
IBIASvoltageshouldbe(VDD –1.8V)ormore.
Ao
35 VSSBI
VSS for BIAS current drive circuit.
PWR
36 IBIASC1 Connect to VSS with 0.1uF ± 50% (in the operating temerature Ao
range) capacitor.
www.DataS3he7et4U.comNC
NoConnection. ConnecttotheVSS(recommended)orleaveopen.
38 IBIASC2 Connect to VSS with 0.1uF ± 50% (in the operating temerature Ao
range) capacitor.
39 IBIASR1 ConnecttoIBIASSC1with330Ω± 1%resistor.
Ao
40 PDIN
MonitorPD voltage input. MonitorPDcurrentis converted tothe Ai
voltage with resistor.
41 TEMPMON Temperaturesensormonitoroutput.
Ao
42 BIAS
43 AVDD
44 AVSS
45 TXACT
46 TEST1
47 DVSS
48 DVDD
BIAS reference for internal circuit. Connect to VSS with 12kΩ± Ao
1% resistor.
Power supply for analog circuit.
PWR
VSS for analog circuit.
PWR
TXACT is set when PDIN voltage beyond the reference voltage Do
(DACAPCoutput)andiskeptduringBRST=”H”. TXACTisreset
when BRST is transient “H” → “L”. The polarity can be set with
EEPROM. TXACTisvalidwithin2msafterpower-up.
Testinput. ConnecttoVSSfornormaloperation
Di
VSS for digital circuit.
Power supply for digital circuit.
PWR
PWR
Remark
AC load
≤ 30pF
DC load
≥ 50kΩ
Connectto
VSS.
Center PAD of PKG should be connected to the VSS for good electrical performance and radiation of heat.
<MS0266-E-00> -5- 2003/12
5 Page 
ASAHI KASEI
[AK2574]
15. ADC
Item Condition min typ max Unit Remark
Resolution
7 bit
MaximumInputVoltage
2.09 2.2 2.31 V
MinimumInputVoltage
0V
DNL
-1/2 +1/2 LSB
16. PowerOnReset
Item Condition min typ
Detect Voltage
2.3 2.5
Whendetectsthevoltagedrop,theAK2574goes intoshutdowncondition.
max
2.7
Unit Remark
V
17. On-chipOscillator
Item
ClockFrequency
www.DataSheet4U.com
Condition
min typ max Unit Remark
2.15 MHz
<MS0266-E-00>
-11-
2003/12
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK2574.PDF ] | |
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