參數(shù)資料
型號(hào)： DS1884AT+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 14/92頁(yè)
文件大?。?/td> 0K
描述： IC SFP PON ONU CTRLR 24TQFN
標(biāo)準(zhǔn)包裝： 500
系列： *
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1884AT+ 功能描述:ADC / DAC多通道 SFP and PON ONU Controller RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40
DS1884AT+T 功能描述:ADC / DAC多通道 SFP and PON ONU Controller RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40
DS1884T+ 功能描述:ADC / DAC多通道 SFP+ Controller w/ Digi LDD Interface RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: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 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40
DS1886 制造商:未知廠家 制造商全稱:未知廠家 功能描述:帶有數(shù)字LDD接口的SFP和PON ONU控制器
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