参数资料
| 型号： | DS1863K |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/62页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR DS1863 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | 电信，无源光学网络（PON） |
| 已用 IC / 零件： | DS1863 |
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Burst-Mode PON Controller
With Integrated Monitoring
Modulation Control
The MOD voltage is controlled using an internal tem-
perature indexed Lookup Table.
The MOD output is an 8-bit scaleable voltage output that
interfaces with the MAX3643 ’ s VMSET input. An external
resistor to ground from the MAX3643 ’ s MODSET pin sets
the maximum current the voltage at VMSET input can
produce for a given output range. This resistor value
should be chosen to produce the maximum modulation
current the laser type requires over temperature. The
modulation LUT can be programmed in 2 ° C increments
over the -40 ° C to +102 ° C range to provide temperature
compensation for the laser ’ s modulation. The modulation
DAC ’ s scaling can be used (with APC scaling) to imple-
ment GPON power leveling with a single LUT that works
for all three power levels.
Ranging of the MOD DAC is possible by programming
a single byte in Table 02h.
BIAS and MOD Output During
Initial Power-Up
On power-up the modulation and bias outputs will
remain off until V CC is above V POA , a temperature con-
version has been completed, and if the V CC LO ADC
alarm is enabled, then a V CC conversion above the
customer defined V CC low alarm level has cleared the
V CC low alarm. Once all of these conditions are satis-
POWER-UP TIMING
V POA
fied, the MOD output will be enabled with the value
determined by the temperature conversion and the
modulation LUT.
When the MOD output is enabled and BEN is high, the
I BIAS DAC output will be turned on to a value equal to
I STEP (see above). The start-up algorithm checks if this
bias current causes a feedback voltage above the APC
set-point, and if it does not it continues increasing the
I BIAS by I STEP until the APC set-point is exceeded.
When the APC set point is exceeded, the device will
begin a binary search to quickly reach the bias current
corresponding to the proper power level. After the bina-
ry search is completed the APC integrator is enabled,
and single LSB steps are taken to tightly control the
average power.
All quick-trip and ADC alarm flags are masked until the
binary search is completed. However, the BIAS MAX
alarm is monitored during this time to prevent the bias
output from exceeding MAX IBIAS. During the bias cur-
rent initialization, the bias current is not allowed to
exceed MAX IBIAS. If this occurs during the I STEP
sequence then the binary search routine is enabled. If
MAX IBIAS is exceeded during the binary search, then
the next smaller step is activated. I STEP or binary incre-
ments that would cause I BIAS to exceed MAX IBIAS are
not taken. Many of the alarm sources are likely to trip
V CC
t ON
MOD
VOLTAGE
t SEARCH
4x I STEP
BIAS
CURRENT
3x I STEP
BINARY SEARCH
APC
INTEGRATOR
ON
2x I STEP
I STEP
BIAS
SAMPLE
1
2
3
4
5
6
7
8
9
10
11
12
13
Figure 1. DS1863 Power-Up.
_____________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1863T+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| DS1864 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:SFP Laser Controller and Diagnostic IC |
| DS1864K | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| DS1864T | 制造商:Maxim Integrated Products 功能描述:DUAL TMP CTRL DAC+MONITORS,QFN - Rail/Tube |
| 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 |
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