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| 型号： | DS1884AT+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/92页 |
| 文件大小： | 0K |
| 描述： | IC SFP PON ONU CTRLR 24TQFN |
| 标准包装： | 2,500 |
| 系列： | * |
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DS1884
SFP and PON ONU Controller
with Digital LDD Interface
21
Maxim Integrated
Differential RSSI Input
The DS1884 offers a fully differential input for RSSI
that enables high-side monitoring of RSSI, as shown in
Figure 3. This reduces board complexity by eliminating
the need for a high-side differential amplifier or a cur-
rent mirror.
Laser Bias and Laser Power Through TXMON
The DS1884 measures both laser bias (TXB) and laser
power (TXP) through the same input pin, TXMON. The
DS1884 commands the MAX3710 laser driver to output
the correct monitor signal before each ADC conversions
takes place. Figure 4 shows the two conversion paths.
Each path has independent gain and offset calibration
registers.
Enhanced RSSI Monitoring
(Dual Range Functionality)
The DS1884 offers a feature to improve the accuracy
and range of RSSI, which is most commonly used for
monitoring RSSI. To achieve the SFF-8472 requirement of
0.1W/LSB over -40 to 8.2dBm, the DS1884 makes two
measurements to effectively achieve a 16-bit conversion
with a 13-bit physical ADC. This “dual range” calibration
can operate in two modes: APD mode and PIN mode.
APD Mode
For systems with a nonlinear relationship between the ADC
input and desired ADC result, the mode should be set to
APD mode (Figure 5). The RSSI measurement of an APD
receiver is one such application. Using the APD mode
allows a piece-wise linear approximation of the nonlinear
response of the APD’s gain factor. The crossover point is
the point between fine and coarse points. The ADC result
transitions between the fine and coarse ranges with no
hysteresis. Right-shifting, slope adjustment, and offset
are configurable for both the fine and coarse ranges. Two
registers, XOVER FINE and XOVER COARSE, determine
the crossover point. The XOVER FINE register (A2h Table
02h, Register A0h–A1h) determines the maximum results
returned by fine ADC conversions, before right-shifting.
The XOVER COARSE register (A2h Table 02h, Register
90h–91h) determines the minimum results returned by
coarse ADC conversions, before right-shifting.
Figure 3. RSSI Differential Input for High-Side RSSI
Figure 4. Laser Bias (TXB) and Laser Power (TXP) Monitoring Through TXMON
RSSIP
RSSIN
ADC
680
ROSA
VCC
DS1884
TXMON
BMON
MON_SEL = 0
TXB
TXP
ADC
DS1884
MAX3710
TXMON
BMON
MON_SEL = 1
TXB
TXP
ADC
DS1884
MAX3710
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1884T+ | 功能描述:ADC / DAC多通道 SFP+ Controller w/ Digi LDD Interface RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| DS1884T+T | 功能描述:ADC / DAC多通道 SFP+ Controller w/ Digi LDD Interface RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| DS1886 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:带有数字LDD接口的SFP和PON ONU控制器 |
| DS1886_V1 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:SFP and PON ONU Controller with Digital LDD Interface |
| DS1886T+ | 功能描述:接口 - 专用 PON ONU/SFP CTRLR W/DIG LDD INT RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
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