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PDF AK2570 Data sheet ( Hoja de datos )
| Número de pieza | AK2570 | |
| Descripción | Feed Forward APC LSI | |
| Fabricantes | AKM | |
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ASAHI KASEI
[AK2570]
AK2570
Feed Forward APC LSI for LD Module
DESCRIPTION
AK2570 is the monolithic CMOS LSI has the function of ‘Feed Forward Automatic Power Control (APC)’ for the
Laser Diode (LD) module and maintains the emission intensity of the LD module constant with the high accuracy.
For stabilizing the emission intensity of the LD module affected by the ambient temperature, AK2570 feeds the
compensation voltage from the 2channels - 8bits D to A converter to control the Bias- and the Modulation- current
for the LD module. The compensation voltage corresponds to the temperature characteristic data of the LD module
retained in the on-chip EEPROM and the ambient temperature detected by the on-chip thermo-sensor.
www.DataShAeeKt42U5.c7o0moutputs the alarm signal for the weakened LD emission caused by the aging degradation with comparing
the alarm threshold level and the signal from the monitoring Photo Diode (PD).
The data of the compensation voltage and the alarm threshold level retained in the on-chip EEPROM can be set to
suit for the characteristics of each LD module.
FEATURE
• Realizing all APC function on 1 silicon chip
• Controlling the driving current (the Bias- and the Modulation- current) for the LD module
* Consisting of the 2channels - 8bits D to A converter and the Op-amp
• EEPROM (Electrically Erasable Programmable Read Only Memory)
* The Non-volatile Memory
* The memory capacity : Address 9bits × Data 16bits
* Retaining the data of the compensation voltage and the trimming data of the T-SENSE offset voltage and the ALM timing for
each LD module
• On-chip Thermo-sensor (T-SENSE)
* Detecting the ambient temperature and converting the detected temperature to the voltage
• On-chip Alarm circuit
* Outputting the alarm signal for the weakened LD emission caused by the aging degradation
• On-chip Oscillator
• On-chip Power on reset circuit
• Serial interface
• +3.3V±10% single voltage supply
• Low power consumption (30mA [max])
• Small package (20pin - SSOP : 7.9mm ×7.4mm)
<MS0115-E-00>
1
2001/10
1 page  
ASAHI KASEI
[AK2570]
FUNCTIONAL DESCRIPTION
1. Explanation for the ‘mode’
AK2570 has the 2 operational modes, “Self-operation mode” and “Training mode”.
After executing the evaluation and the adjustment for the LD module including AK2570 in “Training mode”, it
is possible to use AK2570 ordinarily in “Self-operation mode” for compensating the temperature drift of the LD
module.
“Self-operation mode” is the ordinary operational mode. If the ambient temperature drifts, AK2570 can
maintain the emission intensity of the LD module constant by executing the APC operation, i.e. controlling the
Bias- and the Modulation- current for the LD module, periodically (the compensation period is about 100msec)
in “Self-operation mode”. (See p.6) On the other hand, in “Training Mode”, it is possible to evaluate and adjust
AK2570 and the LD module by the access to the data in the EEPROM and the registers. (See p.7)
www.DataSheet4U.com
[a] Constitution of the mode and the command
Self-operation mode
[Note1]
[Note2]
Training mode
Initial setting
Activating internal circuit
Register access EEPROM access
Command for Self-operation mode
Command for Training mode
Command for Selecting AD1
Command for Selecting AD2
Command for A/D operation
Command for Resetting data in RDA1-3
READ-REG
WRITE-REG
EWEN
EWDS
WRITE-EEP
READ-EEP
[Note 1] While operating in “Self-operation mode”, it is possible to shift to “Training mode” by executing
‘Command for Training mode’ and this is the only available command. That is to say that any other
command is not effective in “Self-operation mode”.
[Note 2] On the other hand, while operating in “Training mode”, it is possible to shift to “Self-operation mode”
by executing ‘Command for Self-operation mode’ or forcing the ‘L’ level signal to SK-pin for 50ms
more and AK2570 shifts to “Self-operation mode” with behaving as same as the operation at ‘Power
ON’.
<MS0115-E-00>
5
2001/10
5 Page 
ASAHI KASEI
[AK2570]
ii) Access to the serial interface
Classification
Select Address
Data
Execution
1 000xxxxxxxx x x x x x x x xxxxxxxxx
Command for Ordinary mode
1 1 0 0 1 001xxxxxxxx x x x x x x x xxxxxxxxx
Command for Training mode
[1]Initial Setting
1 010xxxxxxxx x x x x x x x xxxxxxxxx
Command for Selecting AD2
1 011xxxxxxxx x x x x x x x xxxxxxxxx
Command for Selecting AD1
1 1 1 1 1 000xxxxxxxx x x x x x x x xxxxxxxxx
Command for A/D operation
[2]Activating Internal Circuit 1 0 0 1 x x x x x x x x x x x x x x x x x x x x x x x x Command for Resetting data in RDA1-3
0 0 0 0 x x x x x x x x x x x x x x x x D7 D6 D5 D4 D3 D2 D1 D0
READ-REG (RTMP)
0 0 0 1 x x x x x x x x x x x x x x x x D7 D6 D5 D4 D3 D2 D1 D0
READ-REG (RDA1)
0 0 1 0 x x x x x x x x x x x x x x x x D7 D6 D5 D4 D3 D2 D1 D0
READ-REG (RDA2)
0 0 1 1 x x x x x x x x x x x x x x x x D7 D6 D5 D4 D3 D2 D1 D0
READ-REG (RDA3)
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0 1 0 0 x x x x x x x x x x x x x x x x x x x D4 D3 D2 D1 D0
0 1 0 1 x x x x x x x x x x x x x x x x D7 D6 D5 D4 D3 D2 D1 D0
READ-REG (RINT)
READ-REG (RVPD)
1 1 1 0 0 1 1 0 x x x x x x x x x x x x x x x x x x x D4 D3 D2 D1 D0
READ-REG (RATRM)
[3]Register Access
1 0 0 0 x x x x x x x x x x x x x x x x D7 D6 D5 D4 D3 D2 D1 D0
WRITE-REG (RTMP)
1 0 0 1 x x x x x x x x x x x x x x x x D7 D6 D5 D4 D3 D2 D1 D0
WRITE-REG (RDA1)
1 0 1 0 x x x x x x x x x x x x x x x x D7 D6 D5 D4 D3 D2 D1 D0
WRITE-REG (RDA2)
1 0 1 1 x x x x x x x x x x x x x x x x D7 D6 D5 D4 D3 D2 D1 D0
WRITE-REG (RDA3)
1 1 0 0 x x x x x x x x x x x x x x x x x x x D4 D3 D2 D1 D0
WRITE-REG (RINT)
1 1 0 1 x x x x x x x x x x x x x x x x D7 D6 D5 D4 D3 D2 D1 D0
WRITE-REG (RVPD)
1 1 1 0 x x x x x x x x x x x x x x x x x x x D4 D3 D2 D1 D0
WRITE-REG (RATRM)
0 0000xxxxxxx x x x x x x x xxxxxxxxx
EWDS
1 1 0 1 0 0111xxxxxxx x x x x x x x xxxxxxxxx
EWEN
[4]EEPROM Access
0 1 x A8 A7 A6 A5 A4 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
WRITE-EEP
1 0 x A8 A7 A6 A5 A4 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
READ-EEP
Classification
Command
Address
Data
Execution
Note) ‘x’ in this table is not definite, ‘0’ or ‘1’.
<MS0115-E-00>
11
2001/10
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet AK2570.PDF ] | |
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