參數(shù)資料
型號: DS1884AT+T
廠商: Maxim Integrated Products
文件頁數(shù): 15/92頁
文件大小: 0K
描述: IC SFP PON ONU CTRLR 24TQFN
標準包裝: 2,500
系列: *
DS1884
SFP and PON ONU Controller
with Digital LDD Interface
22
Maxim Integrated
PIN Mode
The PIN mode is intended for systems with a linear rela-
tionship between the RSSI input and desired ADC result.
The ADC result transitions between the fine and coarse
ranges with hysteresis, as shown in Figure 6.
In PIN mode, the thresholds between coarse and fine
mode are a function of the number of right-shifts being
used. With the use of right-shifting, the fine mode full scale
is programmed to (1/2nth) of the coarse mode full scale.
The DS1884 now auto ranges to choose the range that
gives the best resolution for the measurement. Table 3
shows the threshold values for each possible number of
right-shifts.
Figure 5. RSSI in APD Mode
Figure 6. RSSI in PIN Mode
CROSSOVER POINT
RSSI RESULT
APD MODE
IDEAL RESPONSE
FINE FULL-SCALE
RESPONSE
COARSE
FULL-SCALE
RESPONSE
RSSI INPUT
PIN MODE
RSSI RESULT
FINE
FULL-SCALE
RESPONSE
COARSE
FULL-SCALE
RESPONSE
FINE
RIGHT-SHIFT
= 3
RSSI INPUT
FINE
COARSE
HYSTERESIS
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DS1886_V1 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:SFP and PON ONU Controller with Digital LDD Interface
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