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AK2573A

125M / 156M Laser Diode Driver + APC

ASAHI KASEI
AK2573A
125M / 156M Laser Diode Driver + APC
PKG BCC++ 48 (7mm 7mm)
I2C is a trademark o f Philips Corporation.
IMODN LD IMOD Imod
CLKP CLKN
CLK (LVPECL)
OSC I-DAC1
MODMON
TEMPSENS
EEPROM
APC I-DAC2
Ibias IBIAS
TEMPMON
Monitor PD
PDMON
SHUTDOWN CONTROL
TXDIS1 TXDIS2 : Open Drain : Pull-up
ASAHI KASEI - Contents -
AK2573A
ASAHI KASEI
AK2573A
ASAHI KASEI
AK2573A
Do not leave open
TXDIS1 TXDIS2 DVDD TXFAULT
Do not leave open
AC load 100pF
NC SDA
SCL DVSS NC DATAALM OPTALM CURRALM
Di PWR Do Do Do
AC Load 100pF Do not leave open Do not leave open
AC Load 30pF AC Load 30pF AC Load 30pF
ASAHI KASEI Pin Description (Continued) PIN# Symbol Function 20 TEMPALM Sets the alarm when detects the over temperature. The polarity can be set with EEPROM. 21 TEMPMON Temperature sensor monitor output.
AK2573A
Remark AC Load 30pF AC load 30pF DC load 50k
BIAS PDMON
AC load 30pF DC load 50k
AVSS AVDD PDIN VSSBI IBIAS VSSBI VSSMD IMOD
IMODN VSSMD VDDMD NC VDDDR VSSDR BIASMON MODMON TEST1 TEST2 TEST3 TEST4 TEST5 TEST6
PWR PWR Ai PWR Ao PWR PWR Ao
Ao PWR PWR PWR PWR Ao Ao Di Di Di Di Di Do Connect to VSS.
Leave open
Center PAD of PKG should be connected to the VSS for good electrical performance and radiation of heat.
ASAHI KASEI . Absolute Maximum Rating Item Symbol Min Max Unit Supply Voltage VDD -0.3 6.0 V GND VSS 0.0 0.0 V Input voltage VIN -0.3 VDD + 0.3 V Input Current IIN -10 10 mA Storage Temperature TSTG -55 130 °C Stress beyond "Absolute Maximum Range" may cause permanent damage to the device. Note 1: Except Data retention. Data retention is prescribed at section- (2) EEPROM. . Recommended Operation Conditions Item Operating Ambient Power Supply Symbol Ta1 VDD1 VDD2 VSS Min -40 3.1 3.0 0.0 Typ 3.3 3.3 0.0 Max 85 3.5 3.5 0.0 Unit °C V V V
AK2573A
Remarks Reference Voltage Except VDD Except VDD Note 1
Remarks Except AVDD AVDD ReferenceVoltage
min 10000 10
ASAHI KASEI 3. Digital Input / Output DC Characteristics Item Symbol min Input High Level VIH 2.0 Input Low Level VIL Output High Level VOH 0.9VDD Output Low Level VOL Input Leakage Current 1 IL1 Input Leakage Current 2 IL2 Note 1: except DATAP, DATAN, CLKP and CLKN pins. Note 2: SDA and TXFAULT pins Note 3: except SDA and TXFAULT pins 4.
AK2573A
max 0.8 0.4 10 350
tF tR SCL tSU.STA tHD.STA tHD.DAT tSU.DAT tSU.STO
max 100
Unit kHz us us ns us us us us us ns us us us ns ms
Remark
Note 1 Note 1
SDA (IN) tBUF tAA tDH
SDA (OUT)
max 1.2 VDD - 1.0
Remarks
ASAHI KASEI
AK2573A
Vamp Vcom CLKP / CLKN DATAP / DATAN CLK (CLKP - CLKN) DATA (DATAP - DATAN) tsu th
6. I-DAC1 Item Resolution Output Current with Full Code 1 Output Current with Full Code 2 Current Supply with Shutdown 1 LSB Current Step 1 1 LSB Current Step 2 DNL 7. I-DAC2 Item Resolution Output Current with Full Code 1 Output Current with Full Code 2 Current Supply with Shutdown 1 LSB Current Step 1 1 LSB Current Step 2 DNL
min 76 38
max 94 50 100
min 48 24
max 60 30 100
8. Duty Cycle Adjustment Item Maximum Pulse Extended 1 LSB Pulse Extended Step Pulse Extended Stability
min 0.5
typ 0.03
Unit ns ns ns
min 0.008 0.008
typ 0.0095 0.0095
max 0.011 0.011
Remark
ASAHI KASEI 10. PDGAIN Item PDIN Input Range PDGAIN Gain Error 11. DACAPC Item Maximum Output Voltage Minimum Output Voltage DNL 12. BIASGEN Item BIAS pin Voltage
AK2573A
min 0.08 -0.5
max 2.5 +0.5
Unit V dB
Remark
Condition Test Mode Test Mode Test Mode
min 1.135 0.752 -1
typ 1.195 0.792
max 1.255 0.832 +1
Unit V LSB
Remark
Condition
typ 1.2
Unit V
Remark
typ -11.56 1.215
max -10.98
Remark Note-1
Condition
min 2.09 -1 / 2
max 2.31 +1 / 2
Unit bit V V LSB
Remark
Condition
min 2.3
typ 2.5
max 2.7
Unit V
Remark
16. On-chip Oscillator Item Condition Clock Frequency Test Mode
typ 2.15
Unit MHz
Remark
max 500
Unit us
Remark Note 1
ASAHI KASEI . Package Information (1) Package Type: 48 pin BCC++ (2) Marking Information: (a) PIN#1 Indication: (b) Logo: AKM (c) Marking Code: AK2573AVB (d) Date Code: YYWWXXX (7 digit)
AK2573A
AKM AK2573AVB YYWWXXX
(3) Package Outline
0.09MIN
"A" Part
"C" Part
0.80 MAX
0.14 MIN
ASAHI KASEI . Circuit Description
AK2573A
1.2 Operation Overview 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 I2C Interface, it realizes an automatic parameter adjustment. (1) Self-running Mode 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 AK2573A works in this mode after power-on. (2) Adjustment Mode Adjustment mode is designed for training the LD characteristics. The AK2573A operates according to the register settings set through the I2C I / F. (3) EEPROM Mode EEPROM mode is used for storing LD characteristics in EEPROM via I2C I / F. to
ASAHI KASEI
AK2573A
2. Driver Fig 2-1 illustrates the block diagram of the driver function. AK2573A has two current DACs, I-DAC1 and I-DAC2. I-DAC1 is for modulation current and I-DAC2 is for bias current. Table 1-1 and 1-2 show I-DAC1, I-DAC2 characteristics. Fig 2-1 Driver Block Diagram
IBIAS AK2573A I-DAC2 Ibias
IMODN
Driver Imod I-DAC1
Output current @ Output Current Current step / Full code (typ) Range (typ) LSB (typ) 85 mA 0 to 85 mA 0.333 mA 43 mA 0 to 43 mA 0.169 mA
Output current @ Output Current Current step / Full code (typ) Range (typ) LSB (typ) 54 mA 0 to 54 mA 0.212 mA 27 mA 0 to 27 mA 0.106 mA
Direct data Latched data with clock
ASAHI KASEI
AK2573A
Vamp Vcom CLKP / CLKN DATAP / DATAN
max 1.2 VDD - 1.0
Remarks see Fig 3-1
see Fig 3-2 and 3-3 see Fig 3-4 Note 1
Fig 3-2 LVPECL input with AC coupling
AK2573A Vbias
Fig3-3 LVPECL input with DC coupling
AK2573A
0.01uF or more
DATAP CLKP Zin DATAN CLKN
DATAP DATAN CLKP CLKN
Vbias
0.01uF or more
Vbias
Fig 3-4 Set-up & Hold Time
DATA (DATAP DATAN) tsu CLK (CLKP - CLKN) th
ASAHI KASEI
AK2573A
Remark
Monitor PD PDIN CPD RPD
CURR ALM
CURRALM
PDGAIN
ASAHI KASEI
AK2573A
TEMPSENS
I-DAC1
Driver MOD Current LD
TEMPSENS charatcteristics Voltage
Address
I-DAC2 BIAS Current
Memory for I-DAC1 Temperature
Memory for I-DAC2
512kHz(typ)
Electrical volume for Monitor PD
ASAHI KASEI
AK2573A
Gain (typ) dB 23.5 23.0 : -7.5 -8.0
Remark 0.5dB step
ASAHI KASEI
AK2573A
I-DAC1 (MOD) FF FF FB FB FF FF+FB FF FF+FB FF+FB FB FB
ASAHI KASEI Table 4-7 APC and EEPROM assignment (Self-running mode)
AK2573A
Remarks
Prohibit
Table 4-8 APC and EEPROM assignment (Adjustment mode)
Prohibit
ASAHI KASEI
AK2573A
4.3 Temperature Sensor (TEMPSENS) Fig 4-11 shows an on-chip temperature sensor characteristics and Table 4-9 shows the relationship between detected temperature and ADC code. Fig 4-11 On-chip Temperature Sensor Characteristics
On-chip Temperature sensor characteristics 2.5
2.0 Output voltage V V
0.0 -40 -20 0 20 40 60 80 100 120 Temperature t °C
Temperature sensor detects the junction temperature, not LD or ambient temperature.
ASAHI KASEI Table 4-9 AD code and detected temperature typ AD code AD code Temp Temp 0 140.1 32 92.2 1 138.6 33 90.7 2 137.1 34 89.2 3 135.6 35 87.7 4 134.1 36 86.2 5 132.6 37 84.7 6 131.1 38 83.2 7 129.6 39 81.7 8 128.2 40 80.2 9 126.7 41 78.7 10 125.2 42 77.2 11 123.7 43 75.7 12 122.2 44 74.2 13 120.7 45 72.7 14 119.2 46 71.2 15 117.7 47 69.7 16 116.2 48 68.2 17 114.7 49 66.7 18 113.2 50 65.2 19 111.7 51 63.7 20 110.2 52 62.2 21 108.7 53 60.7 22 107.2 54 59.2 23 105.7 55 57.7 24 104.2 56 56.2 25 102.7 57 54.7 26 101.2 58 53.2 27 99.7 59 51.7 28 98.2 60 50.2 29 96.7 61 48.7 30 95.2 62 47.2 31 93.7 63 45.7
AK2573A
AD code 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
Temp 44.2 42.7 41.2 39.7 38.2 36.7 35.2 33.7 32.2 30.7 29.2 27.7 26.3 24.8 23.3 21.8 20.3 18.8 17.3 15.8 14.3 12.8 11.3 9.8 8.3 6.8 5.3 3.8 2.3 0.8 -0.7 -2.2
AD code 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
Temp -3.7 -5.2 -6.7 -8.2 -9.7 -11.2 -12.7 -14.2 -15.7 -17.2 -18.7 -20.2 -21.7 -23.2 -24.7 -26.2 -27.7 -29.2 -30.7 -32.2 -33.7 -35.2 -36.7 -38.2 -39.7 -41.2 -42.7 -44.2 -45.7 -47.2 -48.7 -50.2
4.4 Current Monitor AK2573A has MOD current and BIAS current monitor, MODMON and BIASMON respectively. MODMON is 0.0095 times of I-DAC1 output (source type) and BIASMON is 0.0095 times of I -DAC2 output (source type).
AK2573A
Polarity Detected Time Programmable 5us (typ) (Note 1) Programmable every 125us (typ) Programmable every 128ms (typ) Programmable 4.5us (typ) "H" depends on detected ALM
TXFAULT 0 1 ORed ALM 0 1 (Hold) 0 or 1 (Hold)
I-DAC output Normal Operation Normal Operation Shutdown Normal Operation Shutdown Shutdown
AK2573A
SFP TXFAULT Operation
Remarks
AK2573A
Remark
Monitor PD PDIN CPD RPD
Digital Filter
PDGAIN
Detection and reset OPTALM vary with the cut-off frequency of CPD and RPD
AK2573A
TXDIS
2ms LD Current APC FF or FB initial setting APC FF
TXFAULT with OPTALM enable (if accelerated delay time is selected)
Normal Operation
APC FB initial procedure ALM operation Power On Reset TXFAULT enable without OPTALM) TXFAULT with OPTALM enable
TXDIS 2ms
TXFAULT with OPTALM enable (if accelerated delay time is selected)
LD current
APC FF or FB initial setting APC FF
APC FB initial procedure
Normal Operation
Power On Reset
ALM operation TXFAULT enable without OPTALM) TXFAULT with OPTALM enable
ASAHI KASEI 7.4 TXDIS Timing during Normal Operation
VDD 10us (min) TXDIS
AK2573A
Temperature gap detection Normal Initialize Procedure: 160ms (typ) Acceleration Procedure: 1ms (max)
7.5 TXFAULT Detection / Reset with Recovery
TXDIS FAULT
TXFAULT Acceleration selected LD current
Depends on detected ALM (see Table 5-1)
ASAHI KASEI 7.6 TXFAULT Detection / Reset without Recovery
AK2573A
TXDIS
FAULT
TXFAULT
LD current
Depends on detected ALM (see Table 5-1)
ASAHI KASEI
AK2573A
8. I2C I / F 8.1 Memory Map Table 8-1 shows the EEPROM / Register address map. Accessto memory (EEPROM / registers) is done via the I2C I / F format. WP (Write Protect) may limit the access of memory as shown in Table 8-2. Table 8-1 Memory map Device Address Device Address-1 A0h 1010 A0h A2h A4h A6h A6h A8h A8h A8h 1010 1010 1010 1010 1010 1010 1010 1010 Device Address-2 000 000 001 010 011 011 100 100 100 Address 00000000 to 01111111 10000000 to 11111111 00000000 to 11111111 00000000 to 11111111 00000000 to 01111111 10000000 to 11111111 00000000 to 00011001 00011010 to 11111110 11111111 Data User Area (EEPROM, 1kbit) No memory No memory Adjustment data (EEPROM, 3kbit) No memory Registers No memory AK2573A Operation mode change
ASAHI KASEI 8.2 Read / Write Operation 8.2.1 Byte Write
AK2573A
Device Address-1
Device R / Address-2 W A C K Address (MSB First)
A C K Data (MSB First)
8.2.2 Page Write AK2573A is capable of 16-byte page write.
Device Address-1
R / Device Address-2 W A C K Address (MSB First)
A C K Data (Address)
A C K Data (Address + 1)
A C K Data (Address + n)
8.2.3 Current Address Read The internal address counter maintains the last address accessed during the last read or write operation, incremented by one. The roll over address is changed WP setting. Refer to Table 7-2 in detail.
Device Address-1
Device R / Address-2 W A C K Data (MSB First)
8.2.4 Random Read A random read requires a "dummy" byte write sequence to specified "Address". After receive the ACK from AK2573A, perform "current address read" (see 8.2.2).
Device Address-1
Device R / Address-2 W A C K
Address (MSB First)
Device Address-1
Device R / A Address-2 W C K Data (MSB First)
Dummy Write
8.2.5 Sequential Read Sequential read can be initiated as ether"Current Address Read" or "Random Read". After issuing either of them, the AK2573A continues to output data for each ACK received.
Device R / A Address-2 W C K Data-1 (MSB First)
A C K Data-2
A C K Data-n
ASAHI KASEI
AK2573A
8.2.6 Data Change The SDA pin is normally pulled high with 4.7k to 10k. Data on the SDA pin may change only during SCL low time period. Data changes during SCL high periods will indicate a start or stop condition.
Data Stable Data Change
8.2.7 Start / Stop Condition Start Condition: A high-to-low transition of SDA with SCL high is a start condition that must precede any other command. Stop Condition: A high-to-low transition of SDA with SCL high is a stop condition.
START STOP
AK2573A
Initial Value 00h
Remark
see Table 8-4 and 8-5
AK2573A
Temperature compensation 1 at shutdown release ON / OFF Delay time of TXFAULT 1 detection with OPTALM ALM Polarity 1 OPTALM Reference Level 2
Temperature Difference 7 Detection Level APC FB Dual Feedback 7 Ratio DATAALM mask 1 PDGAIN TEMPALM Level 6 7
TEMPALM Reserved (for AKM Test)
ASAHI KASEI
AK2573A
Temperature compensation 1 at shutdown release ON / OFF Delay time of TXFAULT 1 detection with OPTALM ALM Polarity 1 OPTALM Reference Level Temperature Difference Detection Level APC FB Ratio for I-DAC1 DATAALM Mask APC FB Ratio for I-DAC2 PDGAIN TEMPALM Level Detected Temperature Temperature at Shutdown request I-DAC1 FF I-DAC2 FF APC FB I-DAC1 FB I-DAC2 FB I-DAC1 I-DAC2 APC Reference CURRALM for I-DAC1 CURRALM for I-DAC2 Duty Adjust Test for AKM 2 7 7 1 7 6 7 7 7
see section 4.3 0: DATAALM Valid 1: DATAALM Invalid R / W see section 4.3 R / W see Table 4-2 R / W see Table 4-9 R / (W) see Table 4-9 R / (W) see section 6.2 R / W R / W R / (W) R / (W) R / (W) R / (W) R / (W) R / W R / W R / W R / W Note 2 Note 3 Note 1 Note 1 Note 1 Note 2 Note 3 see Table 4-3 see section 5.2 see section 5.2
ASAHI KASEI
AK2573A
ASAHI KASEI Fig 8-1 The data format of signed 9 bit register
AK2573A
Sign D8
Read Data via Digital I / F (8 bit) (Sign + Body (MSB 7bit) Write Data via Digital I / F (8 bit) (Body 8bit, Negative Data can not be written)
Operation mode Self-running mode Adjustment mode EEPROM mode
ASAHI KASEI 10. Module Adjustment Example Table 10-1 shows the module adjustment example.
AK2573A
ASAHI KASEI . Circuit Example Fig-A illustrates circuit example of AK2573A. Fig-A Circuit Example
AK2573A
VDDMD NC C17 C18 VDDDR VSSDR
PDMON BIAS TEMPMON
BIASMON MODMON TEST1 TEST2 TEST3 TEST4
AK2573AVB
TEMPALM CURRALM OPTALM DATAALM NC DVSS
TXDIS1
DATAP
DATAN
TXDIS2
TXFAULT
TEST5 TEST6 NC SEL WP
For full access: GND For write protection: Open or VDD
LVPECL I / F
DATA Only AC Coupling TD + C101 R101 C102 DATAN SEL CLKP VDD or Open CLKN VDD or Open R113 TD R114 DATAP DATA Only DC Coupling R111 TD + R112 TD R124 R125 CLK + R126 CLKP DATA & CLK DC Coupling DATAP TD + R122 R121 DATAP R123 DATAN SEL CLKP CLKN
DATAN SEL
R127 CLK R128
ASAHI KASEI
AK2573A
IMPORTANT NOTICE · These products and their specifications are subject to change without notice. Before considering any use or application, consult the Asahi Kasei Microsystems Co., Ltd. (AKM) sales office or authorized distributor concerning their current status. · AKM assumes no liability for infringement of any patent, intellectual property, or other right in the application or use of any information contained herein. · Any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. · AKM products are neither intended nor authorized for use as critical components in any safety, life support, or other hazard related device or system, and AKM assumes no responsibility relating to any such use, except with the express written consent of the Representative Director of AKM. As used here: (a) A hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. (b) A critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. · It is the responsibility of the buyer or distributor of an AKM product who distributes, disposes of, or otherwise places the product with a third party to notify that party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold AKM harmless from any and all claims arising from the use of said product in the absence of such notification.