参数资料
| 型号： | DS1861E+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 20/25页 |
| 文件大小： | 0K |
| 描述： | IC LASR CTRLR 1CHAN 5.5V 14TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| 类型： | 激光二极管控制器（光纤） |
| 通道数： | 1 |
| 电源电压： | 2.85 V ~ 5.5 V |
| 电流 - 电源： | 5mA |
| 工作温度： | -40°C ~ 95°C |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
Full Laser Control with Fault Management
? ER < 6 : 0 > + 32
N = ?
? ER < 6 : 0 > + 32 RSEL = 1
? RSEL = 0
2
?
The default setting of ER = 1Ch corresponds to N = 30,
which is the minimum useable value. The maximum
useable value is N = 136 (ER = E8h). For more informa-
tion refer to the Automatic Extinction Ration Control
section.
? MODLOAD .....<R/W><NV><0000h> This register
determines the startup value of I MODSET following a
falling edge of TX-D when MODLOAD_Enable = 1 and
no fault condition has occurred. This 12-bit register
value is left justified in a 16-bit register. The 4 LSBs
default to 0s.
? Control .....<R/W><NV><70h> This byte is used to
enable/disnable the shutdown alarms and configure
several other settings. Writing to this byte causes an
EEPROM write cycle, even if only the HALT bit (SRAM)
is changed. It should not be modified more than the
specified number of write cycles.
0. HALT.....Setting this bit high stops the control
loop and freezes the outputs at their present
state. Once the control loop is stopped the I BIASSET
and I MODSET output registers can be read.
This bit is SRAM and resets to zero when V CC
drops below V POAF .
1. Excite_Disable.....Setting this bit high prevents
the DS1861 from entering the excitation state (it
does not add the disturbance current), which
disables automatic extinction ratio control. I MODSET
will remain at its last value until reset by a
fault or set to MODLOAD.
2. Soft_TX-Disable.....This bit is ORed with the TX-D
pin to create the internal TX-Disable signal. So
asserting either Soft_TX-Disable or the TX-D pin
will disable the outputs. Both Soft_TX-Disable
and TX-D must be deasserted for the outputs to
operate.
3. DPOL.....Diode Polarity. Set to 0 to have the
BMD pin source current. Set to 1 to have BMD
sink current.
4. HBIAS_Enable.....Set high to allow a safety fault
caused by high bias alarm shut the part down.
5. LTXP_Enable.....Set high to allow a safety fault
caused by low transmitted power alarm shut the
part down.
6. HTXP_Enable.....Set high to allow a safety faultl
caused by high transmitted power alarm shut
the part down.
7. MODLOAD_Enable.....If high, I MODSET loads the
value in MODLOAD on the falling edge of TX-D
when no fault condition is present. Otherwise,
I MODSET will return to operation with its value
prior to when TX-D was asserted.
Quick-Trip Monitors
? HTXP Threshold .....<R/W><NV><00h> Sets the
threshold current for the HTXP alarm. The alarm trips
when I BMD > I BMD SETPOINT · [1 + ( HTXP
Threshold<2:0> ) 0.125]. Set to 00h to disable the alarm.
? LTXP Threshold .....<R/W><NV><00h> Sets the
threshold current for the LTXP alarm. The alarm trips
when I BMD < I BMD SETPOINT · [1 - ( LTXP
Threshold<2:0> ) 0.125]. Set to 00h to disable the alarm.
? HBIAS Threshold .....<R/W><NV><00h> Sets the
threshold current for the high bias current alarm. The
alarm trips when BIAS current is ≥ 7.625μA x ( HBIAS
Threshold) . This register value is compared directly
against the I BIASSET code value in register D1h to
determine if an alarm condition has occurred. Set
HBIAS threshold to 00h to disable this alarm.
Password
? PW High and Low .....<R/W><NV><0000h> The PWE
value is compared against the value written to these
locations to determine if the user has write access to
password-protected memory locations. These locations
read as zeros unless the password has been entered
into PWE to ensure the password remains secure.
DAC Codes
? I BIASSET Code .....<R/W><V><00h> This is the most
signicant byte of the 18-bit I BIASSET DAC code. I BIASSET
= 7.625μA x (I BIASSET code). The part must be halted
and the password must be entered to read this value.
? I MODSET Code .....<R/W><V><0000h> The I MODSET
DAC code. The LSB weight of the I MODSET DAC code
is 477nA. Thus, I MODSET = 477nA x (I MODSET code).
The part must be halted and the password entered to
read this value. The four least significant bytes of this
register read as 0s.
20
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| DS1861E+ | 功能描述:激光驱动器 Closed Loop Laser Control RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装:Tube |
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