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參數(shù)資料
| 型號： | DS1875T+T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 17/92頁 |
| 文件大小： | 0K |
| 描述： | IC SFP CTRLR/TRIPLEXER 38-TQFN |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 應(yīng)用： | 光纖 |
| 接口： | I²C |
| 電源電壓： | 2.85 V ~ 3.9 V |
| 封裝/外殼： | 38-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 38-TQFN（5x7） |
| 包裝： | 帶卷 (TR) |
| 安裝類型： | 表面貼裝 |
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DS1875
24
______________________________________________________________________________________
Dual-range functionality consists of two modes of opera-
tion: fine mode and coarse mode. Each mode is calibrat-
ed for a unique transfer function, hence the term, dual
range. Table 6 highlights the registers related to MON3.
Fine mode is equivalent to the other MON channels. Fine
mode is calibrated using the gain, offset, and right-shift-
ing registers at locations shown in Table 6 and is ideal
for relatively small analog input voltages. Coarse mode is
automatically switched to when the input exceeds the
threshold (to be discussed in a subsequent paragraph).
Coarse mode is calibrated using different gain and offset
registers, but lacks right-shifting (since coarse mode is
only used on large input signals). The gain and offset
registers for coarse mode are also shown in Table 6.
With the use of right-shifting, the fine mode full scale is
programmed to (1/2N)th the coarse mode full scale. The
DS1875 will now autorange to choose the range that
gives the best resolution for the measurement. To elimi-
nate chatter, 6.25% of hysteresis is applied when the
input resides at the boundary of the two ranges. See
Figure 10. Additional information for each of the registers
can be found in the
Memory Map section.
Dual range operation is transparent to the end user. The
results of MON3 analog-to-digital conversions are still
stored/reported in the same memory locations (68–69h,
Lower Memory) regardless of whether the conversion
was performed in fine mode or coarse mode.
When the DS1875 is powered up, analog-to-digital con-
versions begin in a round-robin fashion. Every MON3
timeslice begins with a fine mode analog-to-digital con-
version (using fine mode’s gain, offset, and right-shift-
ing settings). See the flowchart in Figure 10. Then,
depending on whether the last MON3 timeslice resulted
in a coarse-mode conversion and also depending on
the value of the current fine conversion, decisions are
made whether to use the current fine-mode conversion
result or to make an additional conversion (within the
same MON3 timeslice), using coarse mode (using
coarse mode’s gain and offset settings, and no right-
shifting) and reporting the coarse-mode result. The
flowchart also illustrates how hysteresis is implement-
ed. The fine-mode conversion is compared to one of
MON3
TIMESLICE
END OF MON3
TIMESLICE
PERFORM FINE-
MODE CONVERSION
REPORT FINE
CONVERSION RESULT
REPORT COARSE
CONVERSION RESULT
DID PRIOR MON3
TIMESLICE RESULT IN A
COARSE CONVERSION?
(LAST RSSI = 1?)
LAST RSSI = 0
LAST RSSI = 1
WAS CURRENT FINE-
MODE CONVERSION
≥ 93.75% OF FS?
PERFORM COARSE-
MODE CONVERSION
DID CURRENT FINE-
MODE CONVERSION
REACH MAX?
N
Y
N
Figure 10. RSSI Flowchart
Table 6. MON3 Configuration Registers
REGISTER
FINE MODE
COARSE MODE
MON3 FINE SCALE
98h–99h, Table 02h
9Ch–9Dh, Table 02h
MON3 FINE OFFSET
A8h–A9h, Table 02h
ACh–ADh, Table 02h
RIGHT SHIFT0/1
8Eh–8Fh, Table 02h
—
CONFIG (RSSI_FC, RSSI_FF bits)
89h, Table 02h
MON3 VALUE
68h–69h, Lower Memory
PON Triplexer and SFP Controller
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| DS1876T+ | 功能描述:ADC / DAC多通道 SFP+ Controller w/ Dual 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-40 |
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