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参数资料
| 型号： | DS1861B+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 17/25页 |
| 文件大小： | 0K |
| 描述： | IC LASR CTRLR 1CHAN 5.5V 16CSBGA |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 810 |
| 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： | 16-LBGA，CSPBGA |
| 供应商设备封装： | 16-CSBGA（4x4） |
| 包装： | 托盘 |
| 安装类型： | 表面贴装 |
Full Laser Control with Fault Management
communicate over the I 2 C bus and for the analog cir-
cuitry to function properly. The first monitoring level, the
Table 1. HTXP Threshold Settings
power-on digital voltage (V POD ), inhibits the part’s I 2 C
functionality when V CC is below V POD . The second
monitoring level is the power-on analog voltage (V POA ).
The DS1861 disables I BIASSET and I MODSET and
asserts the TX-F output whenever V CC is below V POA .
Both V CC monitors are nonmaskable, so there is no way
to force the chip to function when V CC is not at an ade-
quate level to assure the DS1861 operates properly.
The high and low transmit power quick-trip thresholds
are each programmed by 3 bits that select one of
seven different levels as a function of the expected
I BMD current. Each QT monitor can be disabled by pro-
HTXP_Thresh<2:0>
000
001
010
011
100
101
110
111
HIGH-TRANSMIT POWER
THRESHOLD (I SET )
Disabled*
Do not use
1.30
1.43
1.56
1.69
1.82
1.95
gramming all three bits to zero. Disabling a QT by pro-
gramming its control bits to zero prevents the QT alarm
flags from ever being set, which consequently prevents
that monitor from asserting the TX-F output, latching the
device into a shutdown condition, or setting the alarm
* Disabled inhibits the HTXP QT from causing a shutdown or
asserting TX-F.
Table 2. LTXP Threshold Settings
bits in the Status register. The HTXP and LTXP enable
bits can be used to prevent the transmit power level
QTs from causing shutdown while allowing the TX-F
output to be set to flag the system of a transmit power
fault condition. Figure 13 shows the shutdown logic.
Tables 1 and 2 show the QT thresholds as a function of
I BMD current-set point.
The high-bias, quick-trip alarm features an 8-bit thresh-
old setting with an LSB of 8.2μA. Programming the
HBIAS threshold to zero inhibits the HBIAS alarm flag,
preventing TX-F from being asserted, the HBIAS alarm
from causing a shutdown, and the HBIAS alarm bit in
Status from being set. The HBIAS enable bit can be
LTXP_Thresh<2:0>
000
001
010
011
100
101
110
111
LOW-TRANSMIT POWER
THRESHOLD (I SET )
Disabled*
Do not use
0.81
0.76
0.54
0.41
0.28
0.14
used to prevent shutdown from occurring while allow-
ing the HBIAS alarm flag to trigger TX-F.
Password Protection
The DS1861 has two 16-bit password entry registers
(used as a 32-bit value) and two 16-bit password regis-
ters (used as 32-bit value) that can be used to write-pro-
tect all the configuration settings. The password entry
registers, PWE High and PWE Low, are the locations
where the user enters the password to disable the write
protection and change the device settings. The pass-
word bytes, PW High and PW Low, set the password to a
new value. When the device is write-protected, the only
bytes that can be written are the password entry bytes.
To secure the password, the PW bytes always read as
0s when the PWE bytes do not match the PW bytes.
Once the correct password has been entered into the
* Disabled inhibits the LTXP QT from causing a shutdown or
asserting TX-F.
PWE bytes, the password can also be read from the
PW registers. Because the PWE bytes can be read all
the time, it is recommended that the PWE bytes are
written to all 1s once the desired settings are modified
to prevent anyone from simply reading PWE to attain
the password. The PWE bytes are SRAM, so they reset
themselves to 1s if V CC drops below V POA .
In addition to write protection, the password must also
be entered and the DS1861 must be HALTed to read
the I BIASSET and I MODSET DAC codes. See the
Reading the BIASSET and MODSET Registers section
for more information about reading the DAC codes.
____________________________________________________________________
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1861B+ | 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 |
| DS1861E | 制造商:Maxim Integrated Products 功能描述:LASER DRVR 1CH 14TSSOP - Rail/Tube |
| 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 |
| DS1862 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:XFP Laser Control and Digital Diagnostic IC |
| DS1862A | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:XFP Laser Control and Digital Diagnostic IC |
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