|Description||Feed-forward Apc For Laser Diode Modules|
|Company||AKM Semiconductor, Inc.|
|Datasheet||Download AK2570 datasheet
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 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. AK2570 outputs 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 moduleEEPROM (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* Detecting the ambient temperature and converting the detected temperature to the voltage
* 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 +3.3Vą10% single voltage supply Low power consumption (30mA [max]) Small package (20pin - SSOP 7.9mm ×7.4mm)
ASAHI KASEI AK2570 consists of these circuit blocks as below. Circuit block Oscillator VREF Functional description
This circuit generates the standard clock that settles the timing for the sequence of the internal circuit in " Self-operation mode (Ordinary mode)". This circuit generates the reference voltage for the to D converter, the to A converter and the T-SENSE. This circuit is the thermo-sensor, outputs the voltage corresponding to the ambient temperature, i.e. the temperature to voltage converter, and transfers this output voltage to AD2. Also it integrates the offset adjustment circuit that cancels the distribution. The to D converter encodes the input voltage at VPDIN-pin (the signal from the monitor PD) to the 8bits digital data. It is possible to read the encoded data of monitor PD signal (the reference data for RDA3) held in RVPD register and to set the alarm threshold level for the degraded in " Training mode". The to D converter encodes the T-SENSE output signal to the 8bits digital data. In " Self- operation mode", the encoded data of the ambient temperature detected by the
T-SENSE is converted to the EEPROM address and utilized for reading the temperature characteristic data of the LD retained in the EEPROM. In " Training mode", it is possible to read the encoded data of the detected temperature held in RTMP register. This block consists of the to A converter and the Op-amp and controls the Bias- or the
Modulation- current for the LD. DA1 decodes the 8bits digital data held in RDA1 register to the compensation voltage for the temperature drift of the LD. Inputting the ` H' level signal to SHUTDN-pin makes that DAOUT1-pin outputs ` 0V (min.)'. This block consists of the to A converter and the Op-amp and controls the Bias- or the
Modulation- current for the LD. DA2 decodes the 8bits digital data held in RDA2 register to the compensation voltage for the temperature drift of the LD. Inputting the ` H' level signal to SHUTDN-pin makes that DAOUT2-pin outputs ` 0V (min.)'. This block outputs the ` H' level alarm signal from ALM-pin in the case that the monitoring PD signal becomes lower than the alarm threshold level retained in the EEPROM and held in RDA3 register, and this case is caused by the aging degradation. This memory is the non-volatile memory, has the capacity ` Address 9bits × Data 16bits' and retains the data as below,
1. The temperature compensation data for the LD (transferred to RDA1 and RDA2 registers) and the alarm threshold level data for the degraded LD (transferred to RDA3 register) corresponding to the ambient temperature (the output from the T-SNESE and AD2). 2. The trimming data for the T-SENSE offset and the ALMOUT timing.
This circuit temporarily stores the ambient temperature data (in RTMP register), the Register Control Power on Reset temperature compensation data for the LD (in RDA1 and RDA2 registers), the alarm threshold level data (in RDA3 register) and so on. This circuit controls the internal circuit, e.g. registers, with the serial interface. At ` Power ON', this circuit initializes the data in all registers (see p.9) and sets in " Self-operation mode".
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