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参数资料
| 型号： | DS1862AB+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA25 |
| 封装： | 5 X 5 MM, ROHS COMPLIANT, CSBGA-25 |
| 文件页数： | 9/42页 |
| 文件大小： | 586K |
| 代理商： | DS1862AB+ |
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DS1862A
XFP Laser Control and Digital Diagnostic IC
______________________________________________________________________________________
17
Monitor Channels
The DS1862A has seven monitored voltage signals that
are polled in a round-robin multiplexed sequence and
are updated with the frame rate, tFRAME. All channels
are read as 16-bit values, but have 13-bit resolution,
and with the exception of temperature measurements,
all channels are stored as unsigned values. The resulting
16-bit value for all monitored channels, except internal
temperature, is calculated by internally averaging the
analog-to-digital result eight times. The resulting internal
temperature monitor channel is averaged 16 times. See
the
Internal Calibration section for a complete descrip-
tion of each channel’s method(s) of internal calibration.
The AUX1MON, AUX2MON, and VCC2/3 monitor chan-
nels are optional and can be disabled. This feature
allows for shorter frame rate for the essential monitor
channels. Channels that cannot be disabled are inter-
nal temperature, BMD, RSSI, and IBIASMON. A table of
full-scale (FS) signal values (using factory internal cali-
bration without right shifting) and the resulting FS code
values for all seven channels is provided in Table 4.
Measuring Temperature—Internal or External
The DS1862A is capable of measuring temperature on
three different monitor channels: internal temperature
sensor, AUX1MON, and AUX2MON. Only the internal
temperature and AUX2MON channels are capable of
indexing the LUT to control the extinction ratio. To use
an external temperature sensor on AUX2MON, the
TEMP_INT/EXT bit in Table 04h, Byte 8Bh, must be set.
While AUX2MON controls the extinction ratio, the inter-
nal temperature sensor does not stop running; despite
extinction ratio control by AUX2MON, it is this internal
temperature signal that continues to control the status
of temperature flags. Also, when TEMP_INT/EXT = 1,
the internal temperature clamps at -40°C and
+103.9375°C, and when TEMP_INT/EXT = 0 it clamps at -
120°C and +127.984°C. AUX2MON, however, does have
its own flag to indicate an out-of-tolerance condition and
assert the INTERRUPT pin.
Both AUX1MON and AUX2MON can be used to mea-
sure temperature as a function of voltage on their
respective pins. They can be enabled by selecting
either 0h or 4h from Table 5. Internal (or external) cali-
bration may be required to transmute the input voltage
to the desired two’s-complement digital code, readable
from the result registers in lower memory, Bytes 6Ah,
6Bh, 6Ch, 6Dh.
Measuring VCC2/3
The DS1862A has the flexibility to internally measure
either VCC2 or VCC3 to monitor supply voltage. VCC2 or
VCC3 is user selectable by the VCC2/3_SEL bit in Table
01h, Byte DCh. To remove VCC2/3 from the round-robin
monitor update scheme, despite having VCC2 or VCC3
selected to be monitored, the Reserve_EN bit in Table
04h, Byte 8Bh can be programmed to a 0. The analog
power-on-reset flag, POA, indicates the status of VCC3
power supply. Even though POA seems to behave simi-
larly to VCC2/3 monitor channel, it is completely sepa-
rate and has no connection.
Measuring APC and Laser Parameters—BMD,
IBIASMON, RSSI
BMD and BIASSET are used to control and monitor the
laser functionality. Regardless of the set BMD current in
the APC register, the DS1862A measures BMD pin cur-
rent and uses this value not only to adjust the current
on the BIASSET pin, but also to monitor TX-P as well.
The IBIASMON pin is used to input a voltage signal to
the DS1862A that can be used to monitor the bias cur-
rent through the laser. This monitor channel does not
drive the HIGH BIAS quick-trip (QT) alarms for safety
Table 4. Monitor Channel FS and LSB Detail
SIGNAL
+FS SIGNAL
+FS (hex)
-FS SIGNAL
-FS (hex)
LSB
Temperature
127.984°C
7FF8
-120°C
8800
0.0625°C
VCC2/3
6.5528V
FFF8
0V
0000
100μV
IBIASMON
2.4997V
FFF8
0V
0000
38.147μV
RSSI
2.4997V
FFF8
0V
0000
38.147μV
AUX1MON
6.5528V
FFF8
0V
0000
38.147μV
AUX2MON
6.5528V
FFF8
0V
0000
38.147μV
BMD (TX-P)
1.5mA
FFF8
0mA
0000
22.888nA
RESERVE_EN
VCC2/3_SEL
RESULT
0
VCC2/3 result not enabled.
0
1
VCC2/3 result not enabled.
1
0
VCC3 is being measured.
1
VCC2 is being measured.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1862AB+ | 功能描述:激光驱动器 XFP Laser Control & Digital Diagnostic 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 |
| DS1862AB+T&R | 制造商:Maxim Integrated Products 功能描述:XFP LASER CONTROL 25CSBGA - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC LASR CTRLR 7CHAN 5.5V 25CSBGA |
| DS1862AB+T&R | 功能描述:激光驱动器 XFP Laser Control & Digital Diagnostic 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 |
| DS1862AB+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:XFP Laser Control and Digital Diagnostic IC |
| DS1862B | 功能描述:激光驱动器 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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