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參數(shù)資料
| 型號： | DS1877T+T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/65頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CTLR/MON SFP 1-2CH 28TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | SFP+ 控制器 |
| 輸入類型： | 邏輯 |
| 輸出類型： | 邏輯 |
| 接口： | I²C |
| 電流 - 電源： | 2.5mA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 28-TQFN-EP（5x5） |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | 90-1877T+TRL |
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15
Maxim Integrated
SFP Controller for Dual Rx Interface
DS1877
a factor of 8, and because the result is digitally divided
by 8 by right-shifting, the bit weight of the measurement
still meets the standard’s specification (i.e., SFF-8472).
The right-shift operation on the ADC result is carried
out based on the contents of right-shift control regis-
ters (Table 02h, Registers 8Eh–8Fh) in EEPROM. Two
analog channels—RSSI1 and RSSI2—each have 3 bits
allocated to set the number of right-shifts. Up to seven
right-shift operations are allowed and are executed as a
part of every conversion before the results are compared
to the high and low alarm levels, or loaded into their
corresponding measurement registers (Lower Memory,
Registers 64h to 6Bh). This is true during the setup of
internal calibration as well as during subsequent data
conversions.
Differential RSSI1/RSSI2 Inputs
The device offers fully differential inputs for RSSI1 and
RSSI2. This enables high-side monitoring of RSSI, as
shown in Figure 4. It also reduces board complexity by
eliminating the need for a high-side differential amplifier
or a current mirror.
Enhanced RSSI Monitoring
(Dual-Range Functionality)
The device offers a feature to improve the accuracy and
range of RSSI1/RSSI2, which is most commonly used
for monitoring RSSI. Using a traditional input, the RSSI
measurement accuracy can be increased at the cost
of reduced input signal swing. The device eliminates
this trade-off by offering “dual-range” calibration on the
RSSI1/RSSI2 channels. The dual-range calibration can
operate in two modes: crossover enabled and crossover
disabled. Dual-range operation is enabled by default
(factory programmed in EEPROM). However, it can
easily be disabled by the RSSIn_FC and RSSIn_FF bits
(where n can be 1 or 2) in 8Dh, Table 02h.
Dual-range functionality consists of two ADC modes of
operation: fine mode and coarse mode. Each mode is
calibrated for a unique transfer function, hence the term,
dual range. Table 3 highlights the registers related to
RSSI1/RSSI2. Fine mode is calibrated using the gain,
offset, and right-shifting registers at locations shown in
Table 3, and is ideal for relatively small analog-input
voltages. Coarse mode is automatically switched to
when the input exceeds a threshold. Coarse mode is
calibrated using different gain and offset registers from
fine mode. The gain and offset registers for coarse mode
are also shown in Table 3. Additional information for
each of the registers can be found in the memory map
(Figure 14).
Table 3. RSSI1/RSSI2 Configuration Registers
Figure 4. RSSI1/RSSI2 Differential Input for High-Side RSSI
RSSI_P
RSSI_N
ADC
R
ROSA
VCC
DS1877
REGISTER
FINE MODE
COARSE MODE
RSSI1/RSSI2 Gain
(RSSI1/2 FINE/COARSE SCALE)
9Eh–9Fh/9Ah–9Bh,
Table 02h
9Ch–9Dh/98h–99h,
Table 02h
RSSI1/RSSI2 Offset
(RSSI1/2 FINE/COARSE OFFSET)
AEh–AFh/AAh–ABh,
Table 02h
ACh–ADh/A8h–A9h,
Table 02h
Right-Shift
(RSHIFT1, RSHIFT2)
8Eh–8Fh, Table 02h
Crossover
(XOVER1/XOVER2 FINE/COARSE)
A6h–A7h/96h–97h,
Table 02h
A4h–A5h/94h–95Fh,
Table 02h
FORCE RSSI
(RSSIn_FC and RSSIn_FF Bits)
8Dh, Table 02h
UPDATE
(RSSIR Bit)
6Fh, Lower Memory
RSSI VALUE (RSSI1/RSSI2
Measurement)
68h–69h, Lower Memory
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1878 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:SFP+ Controller with Digital LDD Interface |
| DS1878T | 功能描述:ADC / DAC多通道 SFP+ Controller w/ MAX3946&3945 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 |
| DS1878T TR | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:SFP+ Controller with Digital LDD Interface |
| DS1878T+ | 功能描述:ADC / DAC多通道 SFP+ Controller w/ MAX3946&3945 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 |
| DS1878T+T | 功能描述:ADC / DAC多通道 SFP+ Controller w/ MAX3946&3945 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 |
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