ak2572 AKM Semiconductor, Inc., ak2572 Datasheet
ak2572
Related parts for ak2572
ak2572 Summary of contents
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... Open Drain TEST1 TEST2 TEST3 TEST4 **: Internally Pulled-up <MS0290-E-01> The AK2572 enables to keep the optical power of the direct modulation LD (Laser Diode) constant by the APC (Automatic Power Control) circuit. It consists of a current programming function (APC_FF) responding to the temperature characteristics of each LD, and a Digital feedback function (APC_FB) to adjust the LD current based on the monitoring PD (Photo Diode) current ...
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... APC_FF Function - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14 4.2 APC_FB Function - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15 4.2.1 APC_FB Circuit Block Diagram - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16 4.2.2 Normalization of PD Monitoring Current - - - - - - - - - - - - - - - - - - - - 16 4.2.3 DAC_APC - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17 4.2.4 APC_FB Dividing Function - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17 4.3 APC Operation Setting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17 4.4 On-Chip Temperature Sensor (TEMPSENS) Characteristics - - - - - - - - - - - - - 23 4.5 Current Monitor - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 24 5. Burst Mode Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -25 5.1 Power Leveling [ 5.2 Power Leveling [ <MS0290-E-01> Table of Contents -2- [AK2572] 2004/8 ...
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... Random Read - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 36 9.3.5 Sequential Read - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 37 9.3.6 Data Change - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 37 9.3.7 Start / Stop - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 37 9.4 EEPROM Configuration - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 38 9.5 Register Configuration - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 40 10. Operation Modes - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 44 10.1 Self-Operation Mode - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 44 10.2 Adjustment Mode - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 44 10.3 EEPROM Access Mode - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 44 10.4 Mode Control - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 44 10.5 Operation Mode Change Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45 10.6 Mode Protection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45 11. Example of Adjusting Sequence - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46 VII. EXTERNAL CIRCUIT EXAMPLE = = = = = = = = = = = = = = = = = = = = = = = = = = = = 47 <MS0290-E-01> -3- [AK2572] 2004/8 ...
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... I-DAC2 output current is sourced from this pin. When to convert the 14 BIASMON current to a voltage by an external resistor, select the resistor value such that BIASMON-pin voltage 1 VSSBI Ground for I-DAC2. <MS0290-E-01> I. PIN DESCRIPTION Function resistor. -4- [AK2572] I/O Note Di Connect DVSS Di PWR PWR Connect it to Pulled-up ...
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... WP accessible EEPROM space via Digital interface. Please refer to Section 9.2 for details. <MS0290-E-01> Function “0“, this becomes an LD modulation “1“ “1“, this outputs an LD modulation current 1% resistor. -5- [AK2572] I/O Note Ao PWR PWR Ao PWR Connect external RC filter ...
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... Operating Ambient Temperature Power Supply Voltage < Important Notice > Please pay attention not to keep the condition of VDD1.5V which makes that the Power On Reset function of AK2572 cannot operate correctly, AK2572 supplies the abnormal LD current and the possibility of damaging LD increases. ELECTRICAL CHARACTERISTICS (1) Current Consumption ...
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... Stop Setup Time DH Data Out Hold Time WR Write Cycle Time [*] This parameter is characterized and is not 100% tested. <MS0290-E-01> tHD.DAT tAA tDH Min. Max. 100 4.7 4.0 100 0.1 4.5 4.7 4.0 4.7 0 200 1.0 0.3 4.0 100 10 -7- [AK2572] tR tSU.STO tSU.DAT tBUF Unit Note kHz [*] s s [*] 2004/8 ...
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... VSS) 2.03 2.20 2.37 (to VDD) 0.2 (to VDD) 0.2 (to VSS) 4.7 (to VSS) 8.6 (to VSS (to VSS -8- [AK2572] Unit Note bit Straight Binary Input Code FFh mA RE_DAC1_GAIN 1 Input Code FFh mA RE_DAC1_GAIN 0 RE_MODV_SEL 0 A TXDIS “H” [*] A RE_DAC1_GAIN 1 A RE_DAC1_GAIN 0 LSB Input Code 10h~FFh LSB Input Code 10h~FFh Unit ...
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... Condition Min. Typ. Max. Test mode 8.192 Condition Min. Typ -9- [AK2572] Unit Note Based on I-DAC2 Time Input Code FFh Input Code FFh mA RE_DAC2_GAIN 1 Input Code FFh mA RE_DAC2_GAIN 0 Unit Note V dB Max. Unit Note 1.255 V 0.832 ...
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... ASAHI KASEI (1) Package Type : 28 pin - QFN (2) Marking Information : a PIN#1 Indication : b Marking Code : AK2572 c Date Code : YWWX (4 Digit) (3) Package Outline Dimension 5.2 0.20 5.0 0.10 0.22 0.05 0.50 0.05 <MS0290-E-01> PACKAGE INFORMATION Y : Year WW : Week ( Manufacturing Identification AK 0.60 0. 0.05 -10- [AK2572] 45 2004/8 ...
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... Operational Description Notation In order to distinguish various pre-set parameter sources from EEPROM, Registers or Device pins, “ Identifier – Main name “ notation is used in the AK2572 circuit description as shown in Table 1-1. For ease of operational description, internal signals are sometimes defined which are all expressed in small letters. ...
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... ASAHI KASEI 2. Operation Setting The AK2572 can operate following functions as shown in Table 2-1 by EEPROM / Register setting. For further details, please refer to the circuit description at the next page and thereafter. Table 2-1 AK2572 Operation Setting RE_BURST_SET RE_SFP_SET [*3] RE_PWR_LVL1_SET [*3] RE_PWR_LVL2_SET RE_APC_FF_SET RE_APC_FB_SET RE_OPTALM_SET RE_CURRALM_SET Continuous mode ...
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... ASAHI KASEI 3. I-DAC, V-DAC Functional Part The AK2572 equips Current source type I-DAC1 (Max. sourcing current 10.2 mA [Typ.]) and Voltage output type V-DAC3 (Max. output voltage 2.2 V [Typ.]) for the LD modulation current setting, and Current sink type I-DAC2 (Max. sink current 85.0 mA [Typ.] ) for the bias current setting. Selection of enable / disable each DAC is set by RE_DAC_SET ...
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... ASAHI KASEI 4. APC Functional Part Circuit configuration of the APC part is shown in Figure 4-1. The AK2572 is formed with APC_FF function which sets the programmed current with corresponding to the detected temperature by On-chip temperature sensor and APC_FB function which controls with feedback function to keep the monitoring photo diode current constant ...
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... Memory for Ibias (I-DAC2) E(x): E_BIAS_TC or E_MOD_TC at x=R_TEMP[7:1] 128 address R(z): R_BIAS_FF or R_MOD_FF at z=R_TEMP[7:0]=2x, 2x+1 A proper current value data should be written in advance at each address location which corresponds to each temperature value -15- [AK2572] , 8y+7, R_TEMP 7:3 y, R_TEMP 2 step. The On-chip temperature sensor I-DAC1 LDD (V-DAC3) Imod LD I-DAC2 Ibias ...
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... DIGITAL FILTER APC_ comp_out 1/N 1/s COMP DAC code is incremented or decremented by 1 LSB step in order to prevent the excessive current vapc_ref Function Max. 2.5V Set-up gain Typ. 23.5 dB 23 step - 7 8.0 dB -16- [AK2572] + DAC R_DAC2 R_DAC1/R_DAC3 R_APC_FBIV R_APC_FB Note Note Note 2004/8 ...
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... APC_FB Dividing Function The AK2572 has a function to divide the R_APC_FB value into both Bias current and Modulation current, which is calculated by APC_FB function. By utilizing this function, the extinction ratio can be kept constant by applying feedback operation on Bias and Modulation currents. ...
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... LD is made by the FB current. Fig.4-6 Setting Example 2 (BIAS FF,MOD FB) RE_DAC1_GAIN (RE_DAC3_GAIN) Imod R_MOD_FB (Vmod) R_APC_FB =R_APC_FB G_DAC1 1 (G_DAC3) Ibias G_DAC2 0 RE_DAC2_GAIN R_MOD=R_MOD_FB=R_APC_FB R_BIAS=R_BIAS_FF -18- [AK2572] Figure 4-5 4-6 4-7 4-8 4-9 4-10 4-11 4-12 4-13 RE_DAC1_GAIN (RE_DAC3_GAIN) R_MOD_FF=0 I-DAC1(V-DAC3) Imod R_MOD (Vmod) 10/255 G_DAC1 (2.2/255) ...
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... R_BIAS_FB K_BIAS G_DAC2 _FBRT RE_BIAS_FBRT RE_DAC2_GAIN R_MOD=R_MOD_FB R_MOD_FB=K_MOD_FBRT*R_APC_FB R_BIAS=R_BIAS_FF+R_BIAS_FB R_BIAS_FB=K_BIAS_FBRT*R_APC_FB RE_DAC1_GAIN (RE_DAC3_GAIN) Imod (Vmod) G_DAC1 (G_DAC3) Ibias G_DAC2 RE_DAC2_GAIN -19- [AK2572] RE_DAC1_GAIN (RE_DAC3_GAIN) R_MOD_FF I-DAC1(V-DAC3) Imod R_MOD (Vmod) 10/255 G_DAC1 (2.2/255) (G_DAC3) I-DAC2 R_BIAS Ibias 85/255 G_DAC2 R_BIAS_FF RE_DAC2_GAIN G_DAC1 0.1 G_DAC2 ...
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... R_BIAS_FF 1 R_BIAS_FF 0 R_BIAS_FF 1 Prohibited 0 R_BIAS_FF 1 Prohibited x R_BIAS_FF Content Set to either I-DAC1 or V-DAC3. Added to the APC_FF value after dividing calculation. -20- [AK2572] E_MOD_TC [*1][*2] (Temperature compensation Data for I-DAC1or V-DAC3) R_APC_FBIV R_MOD_FF R_MOD_FF R_MOD_FF R_MOD_FF R_MOD_FF R_MOD_FF R_APC_FBIV R_MOD_FF Note Set to I-DAC2 2004/8 ...
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... R_MOD FB _FBRT _FBRT/128 _FBRT/128 E_MOD R_BIAS R_MOD FB _FBRT _FBRT/128 _FBRT/128 E_MOD R_BIAS R_MOD _FBRT _FBRT/128 _FBRT/128 E_MOD R_BIAS R_MOD _FBRT _FBRT/128 _FBRT/128 [AK2572] MOD E_BIAS E_MOD _TC _TC or R_DAC3 FB_INIT FB_INIT ...
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... R_BIAS_FBRT R_MOD_FBRT I/F /128 /128 R_BIAS_FBRT R_MOD_FBRT I/F /128 /128 R_BIAS_FBRT R_MOD_FBRT I/F /128 /128 R_BIAS_FBRT R_MOD_FBRT I/F /128 /128 R_BIAS_FBRT R_MOD_FBRT I/F /128 /128 [AK2572] MOD BIAS (R_ DAC1 or R_DAC3 ...
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... Figure 4-14 On-chip TEMPSENS Characteristics [Typ.] 2.5 2.0 1.5 1.0 0.5 0.0 -40 < MS0290-E-01> 255 int(- 1.334*t +188.3) [Typ.] 127 int(- 0.667*t +94.0) [Typ.] increment. However, as the temperature compensation data is / LSB slope characteristic. It cannot compensate the error of - Temperature -23- [AK2572] 7% (Reference value by design). /LSB [Typ On-chip 80 100 120 2004/8 ...
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... Temp. R_TEMP Temp 7 45.7 96 93.7 47.2 97 95.2 48.7 98 96.7 50.2 99 98.2 51.7 100 99.7 53.2 101 101.2 54.7 102 102.7 56.2 103 104.2 57.7 104 105.7 59.2 105 107.2 60.7 106 108.7 62.2 107 110.2 63.7 108 111.7 65.2 109 113.2 66 ...
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... ASAHI KASEI 5. Burst Mode Operation The AK2572 is put into Burst mode support operation by setting RE_BURST_SET “1”. When the Burst mode operation is enabled, do not use APC_FB function. Control the LD current by APC_FF function only (RE_APC_FF_SET “3”, RE_APC_FB_SET “0”), and OPTALM and CURRALM should not be selected as the target alarm on TXFAULT-pin (RE_OPTALM_SET “ ...
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... RE_PWR_SEL R_TEMP 7:3 0 00h ~ 1Fh 1 00h ~ 1Fh 2 00h ~ 1Fh 3 00h ~ 1Fh 0 00h ~ 1Fh 1 00h ~ 1Fh 2 00h ~ 1Fh 3 00h ~ 1Fh -26- [AK2572 DAC I-DAC1 I-DAC1 I-DAC2 I-DAC2 V-DAC3 V-DAC3 R_TEMP [ R_TEMP [2: 8y+7, R_TEMP [7:3] y, the Data Address E_MOD0_TC 00h ~ 1Fh E_MOD1_TC 20h ~ 3Fh E_MOD2_TC 40h ~ 5Fh ...
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... ASAHI KASEI 6. Alarm Function In Table 6-1, the outline of the AK2572 Alarm (ALM) functions such as TEMPALM, OPTALM, CURRALM, EXTALM1 and EXTALM2, and TXFAULT output function where alarms to be selected by EEPROM/Register setting are logically OR-ed, are listed. Table 6-1 ALM Function Outlines ALM Condition to output alarm ...
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... Hold the previous TXFAULT level x just before shutdown request Logical “OR” of target ALMs for x TXFAULT Logical “OR” of target ALMs for x TXFAULT -28- [AK2572] Status register Note (A8h / 19h) [*2] R_TXFLT_ST [3] [*3] R_TXFLT_ST [2] R_TXFLT_ST [1] R_TXFLT_ST [0] R_TXFLT_ST [4] Operation Normal operation Shutdown ...
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... DAC output (I-DAC1 or V-DAC3), which is selected as EXTRA_DAC, is not shutdown. 7.2 Operation at Shutdown Release Since the AK2572 continues its temperature detection and APC feed forward operation even during the shutdown, current value that is set by Feed Forward function is temperature compensated even if any temperature difference occurs before or after the shutdown. ...
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... LD must be taken into consideration. Block diagram in Figure 8-1, and pre-settable mask time relation in Table 8-1 are shown. In the AK2572, the delay time can be shortened by accelerated start-up setting which is made by initial value setting function of R_APC_FB and so on. ...
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... TXFAULT with OPTALM enable (When to set accelerated start-up sequence) APC FB initial procedure ALM Operation TXFAULT enable without OPTALM (When not to set accelerated start-up sequence) t_init: 160ms [typ] -31- [AK2572] APC Feedback Normal operation TXFAULT with OPTALM enable APC Feedback Normal operation TXFAULT with ...
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... TXFAULT enable without OPTALM TXFAULT with OPTALM enable 2ms [Typ.] APC FB initial procedure t_on 1ms t_init:160ms[Typ.] -32- [AK2572] No temperature difference exists APC Feedback Normal operation Temperature difference exists TXFAULT with OPTALM enable 2004/8 ...
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... TX_FAULT enable TXFAULT with without OPTALM OPTALM enable t_reset: 10 s[Min.] t_fault TXFAULT detection with OPTALM When to set accelerated start-up sequence: 2ms [Typ.] When not to set accelerated start-up sequence: 160ms [Typ.] TXFAULT detection with EXTALM1,2 2ms [Typ] or 0ms (Set by RE_TIMER_EXTALM1,2) -33- [AK2572] 2004/8 ...
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... Set-up Data (256) No memory (1K) Register Operation Mode Change Command -34- [AK2572] [1] USER AREA for SFP_MSA support when RE_SFP_SET="0" [2] E_MOD_TC2 for Power Leveling [1] when RE_SFP_SET="1" and RE_PWR_LVL1_SET="1" Power Leveling [1] (Select the data for Imod by MOD_CTRL-pin) is available when RE_SFP_SET=" ...
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... MS0290-E-01> “H” 0 1010 xxx When corresponding Device address is input via Digital I/F [*1] Full Access [* PASSWD -35- [AK2572 “L” 1010 000 1010 000 A0h only A0h only Read only Read only Self-Operation Self-Operation Mode only Mode only Sequential read is possible in accessible EEPROM area ...
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... W (MSB First Address S Device Device C (MSB First) T Address-1 Address Don't care when Write Protect "ON" -36- [AK2572 Data (MSB First Data (Address + ...
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... Start / Stop timing chart is shown in Figure 9-8. While SCL is at “H”, Start is effective by setting SDA from “H” to “L”, and Stop is effective by setting SDA from “L” to “H”. Figure 9-8 Start / Stop SCL SDA START < MS0290-E-01> Data Data-2 (MSB First DATA CHANGE STOP -37- [AK2572 Data 2004/8 ...
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... Important Notice > The adjusted data in AKM factory are stored in advance at address location (Device AddressA6h, Address60h) for the offset voltage of the On-chip temperature sensor. If such excessive temperature stress applied to the AK2572 which exceeds a guaranteed EEPROM data retention conditions (for 10 years at 85), it is important to read the pre-determined data in advance and to re-write the same data back into EEPROM after an exposure to the excessive temperature environment ...
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... EXTALM1 mask time setting 1 for SFP_TXFAULT detection Window setting for Temperature 8 difference detection DAC setting for Imod 1 APC_FB dividing value for Imod 7 APC_FB dividing value for Ibias 7 TEMPALM threshold 8 -39- [AK2572] Note Factory setting Factory setting 0 Refer to Table 5-2 0:Non-masked, 1:Masked 0 [5]: EXTALM2, [4]: EXTALM1 0 0:OFF, 1:ON 0 ...
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... R/W : Read / Write operation is possible in Adjustment Mode, and Read operation is possible in Self-Operation Mode when Write Protect operation is released. Data written via Digital I/F is retained till operation mode is altered or data is modified. The AK2572 allows LD module adjustment at the product shipment by modifying the data in R/W registers. R/FW: In addition to R/W function above, Read / Write operation is possible in Self-Operation Mode when Write Protect operation is released. (2) “ ...
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... Ibias APC FB initial value 8 APC target setting 5 APC_FF value for Imod 8 APC_FF value for Ibias 8 EXTRA DAC value 8 CURRALM setting for Ibias 4 CURRALM setting for Imod 4 -41- [AK2572] Note U R/W Refer to Table 4-6 U R/W Refer to Table 4-6 U R/W 0: OFF 0:Gain 1 U R/W 1:Gain 1.2/2.2 R/W 0:Gain 1/2, 1: Gain 1 ...
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... I-DAC2 value 8 U V-DAC3 value 8 U APC_FB value 8 S Operation mode 3 U For AKM test 2 U Body (8 bits -42- [AK2572] Note R Refer to Table 4-10 Refer to Section 7.2 and R Table 4-10 1: Active, 0: Inactive [4] TEMPALM [3] EXTALM2 R [2] EXTALM1 [1] CURRALM [0] OPTALM R [*3] R [*3] R [*3] [7]Sign of APC_FB [*2] ...
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... TEMP_WIN MOD_FBRT BIAS_FBRT APC_FBIV MOD_FF BIAS_FF EXTRA TEMP TEMP_STDW STATUS DAC1 DAC2 DAC3 R_APC_FB [8:1] Reserved (For AKM test) Reserved (For AKM test) -43- [AK2572 TEMP_OFFSET PWR_LVL2 PWR_LVL1 SFP_SET _SET _SET DAC3 DAC2 DAC1 _GAIN _GAIN _GAIN DAC_SET OPTALM TIMER_ TIMER_ ...
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... ASAHI KASEI 10. Operation Modes The AK2572 has the following 3 operation modes operation is automatically executed in accordance with EEPROM setting, Adjustment Mode where each LD adjustment is made and EEPROM Access Mode where adjusting data is written into EEPROM. 10.1 Self-Operation Mode With the On-chip oscillator, those functions as temperature detection, read out of temperature compensation data from EEPROM and LD drive current setting by APC control, are automatically executed ...
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... Self-Operation Mode, WP-pin = “L” or R_WP_CTRL “1” should be set to inhibit the above erroneous operation. < MS0290-E-01> Address Data Operation mode set by command 1111 1111 1010 0000 1111 1111 1010 0111 1111 1111 1010 1110 -45- [AK2572] Self-Operation Mode Adjustment Mode EEPROM Access Mode 2004/8 ...
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... Verify that correct data is written, by reading out the written data. 9 Transition to After writing data into EEPROM, issue a command to make a transition to Self-Operation Mode Self-Operation Mode via Digital I/F. Then the AK2572 automatically initiates its operation in accordance with the setting data retained in EEPROM. < MS0290-E-01> Contents ”1 0000” (its center value), and after ” ...
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... PDIN AVSS AK2572 AVDD TXDIS BURST SCL C21 C11 Mod_def2 Tx_fault VSS=0V Connection of Unused pins : Rvout=1k BURST=VSS Cvout=0.01 F TXDIS=VSS PDIN=VSS -47- [AK2572] VDD=3.3V[typ] Monitor PD Cpd Rpd LDD Current Output (BIASMON) C22 C12 R23 Tx_disable Burst Mod_def1 R21 R22 EXTALM1=VSS EXTALM2/MOD_CTRL=VSS 2004/8 ...
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... ASAHI KASEI [A] Example of the connection to the LDD controlled by AK2572 voltage output for CW LD DATA CLK AK2572 (E_MOD_TC) EXTALMx (E_EXTRA_TC) Monitor PD PDIN Cpd Rpd (E_BIAS_TC) [B] Example of the connection to the LDD controlled by AK2572 current output for CW LD DATA CLK AK2572 (E_EXTRA_TC) EXTALMx (E_MOD_TC) ...
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... ASAHI KASEI [C] Example of the connection to the LDD controlled by AK2572 current output for Burst transmission DATA FF CLK BURST_ CONTROL AK2572 (E_EXTRA_TC) BURST_ (E_MOD_TC) CONTROL BURST (E_BIAS_TC) I-DAC2 < MS0290-E-01> IMODN LDD (Burst) DUTY_ ADJ Voltage Control Vdac3 V-DAC3 Vextra Rv Cv Idac1 I-DAC1 Ibiasmon BIASMON (x0 ...
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... AKM harmless from any and all claims arising from the use of said product in the absence of such notification. < MS0290-E-01> IMPORTANT NOTICE -50- [AK2572] 2004/8 ...