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| 型号： | DS1864T+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 18/72页 |
| 文件大小： | 0K |
| 描述： | IC LASER CTRLR 1CHAN 5.5V 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 激光二极管控制器（光纤） |
| 通道数： | 1 |
| 电源电压： | 2.97 V ~ 5.5 V |
| 电流 - 电源： | 3mA |
| 工作温度： | -40°C ~ 95°C |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
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SFP Laser Controller and
Diagnostic IC
Internal calibration applies to measured values acquired
by the ADC, and does not apply to the fast alarms. If inter-
nal calibration is desired, each analog channel requires
that registers 8Eh through AFh in Table 04h (Table 01h in
DS1859 configuration) are loaded with the appropriate val-
ues to calibrate for gain and offset. Every gain and offset
register is 2-bytes wide. Both gain and offset calibration
are independently capable of converting input variables
into a digital output range spanning 0000h to FFFFh.
The last adjustment is made by using right-shifting.
Right-shifting registers are located in registers A2h
through ABh and AEh to AFh, and store a 3-bit value
used to shift each MON value from 0 to 7 spaces to the
right. The effect of this is to make better use of the ADC
range and increase the accuracy of the readings. Right-
shifting is the last function performed on the MON sig-
nal before the digital value is sent to the MON register.
Temperature Monitor Operation
The internal temperature monitor values are stored in
16-bit 2’s complement format, and located in memory
addresses 60h and 61h of the Lower Memory. The tem-
perature conversions are updated every t FRAME , and
do not occur during an active read or write to memory.
The factory default calibration values for the tempera-
ture monitor are shown in Table 2.
Table 2. Internal Temperature Monitor
Factory Default Calibration
The offset of the temperature sensor can be adjusted
using the internal calibration registers to account for
differences between the ambient temperature at the
location of the DS1864 and the temperature of the
device it is biasing. When offsets are applied to the
temperature measurement, the value converted is off-
set by a fixed value from the DS1864’s ambient temper-
ature. For more information, see the following
Temperature Monitor Offset Calibration section.
Temperature Monitor Offset Calibration
The DS1864’s temperature sensor comes precalibrated
and requires no further adjustment by the customer for
proper operation. However, it is possible to characterize
a system and add a fixed offset to the DS1864’s temper-
ature reading so it is representative of another location’s
temperature. This is not required for biasing because
the temperature offset can be accounted for by adjust-
ing the data’s location in the LUTs, but this feature is
available for customers that see application benefits.
To change the temperature sensor’s offset: write the
temperature offset register to 0000h, measure the
source reference temperature (T REF , °C), and read the
temperature from the DS1864 (T DS1864 , °C). Then, the
following formula can be used to calculate the value for
the temperature offset register.
TEMP OFFSET = ( 64 × ( ? 275 + T REF ? T DS 1864 ) )
XOR BITWISE BB 40 h
SIGNAL
Temperature
+FS
SIGNAL
+127.96875°C
+FS
(hex)
7FF8
-FS
SIGNAL
-128.00°C
-FS
(hex)
8000
Once the value is calculated, write it to the temperature
offset register.
Voltage Monitor Operation
To convert the 2s complement register value to the tem-
perature it represents, first convert the 2-byte hexadeci-
mal value to a decimal value as if it is an unsigned value,
then divide the result by 256. Finally, subtract 256 if the
result of the division is greater than or equal to +128.
Example converted values are shown in Table 3 below.
Table 3. Temperature Conversion Values
In addition to monitoring temperature, the DS1864 mon-
itors V CC and the three MON inputs in a round-robin
fashion using its 13-bit A/D converter. The converted
values are stored in memory addresses 62h to 69h as
16-bit unsigned numbers with the ADC results left justi-
fied in the register. The round-robin update time is
specified by t FRAME in the analog voltage monitoring
characteristics.
MSB
(bin)
01000000
01000000
01011111
11110110
11011000
LSB
(bin)
00000000
00001111
00000000
00000000
00000000
TEMPERATURE
(°C)
64
64.059
95
-10
-40
The default factory-calibrated values for the voltage
monitors are shown in Table 4.
By using the internal gain and offset calibration regis-
ters the +FS and -FS signal values shown in Table 4
can be modified to meet customer needs. For more
information on calibration, see the following Voltage
Monitor Calibration section.
Note: ±FS voltages shown in Table 4 were calculated
assuming factory-programmed gain and offset values
in addition to right shifting set to 0.
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1864T+ | 功能描述:激光驱动器 SFP Laser Controller & Diagnostic IC 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 |
| DS1864T+T&R | 制造商:Maxim Integrated Products 功能描述:DUAL TMP CTRL DAC+MON QFN T&R LF - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC LASER CTRLR 1CHAN 5.5V 28TQFN |
| DS1864T+T&R | 功能描述:激光驱动器 SFP Laser Controller & Diagnostic IC 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 |
| DS1865 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:PON Triplexer Control and Monitoring Circuit |
| DS1865_09 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:PON Triplexer Control and Monitoring Circuit |
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