参数资料
| 型号： | DS1874T+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 21/88页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SFP+ ANLG LDD 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 激光二极管控制器 |
| 通道数： | 1 |
| 电源电压： | 2.85 V ~ 3.9 V |
| 电流 - 电源： | 2.5mA |
| 工作温度： | -40°C ~ 95°C |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
| 其它名称： | 90-1874T+000 |
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SFP+ Controller with Digital LDD Interface
Digital I/O Pins
Five digital input and five digital output pins are provid-
ed for monitoring and control.
LOS, LOSOUT
By default (LOSC = 1, Table 02h, Register 89h), the
LOS pin is used to convert a standard comparator out-
put for loss of signal (LOS) to an open-collector output.
This means the mux shown in the Block Diagram by
default selects the LOS pin as the source for the
LOSOUT output transistor. The output of the mux can
be read in the STATUS byte (Lower Memory,
Register 6Eh) as the RXL bit. The RXL signal can be
inverted (INV LOS = 1) before driving the open-drain
output transistor using the XOR gate provided. Setting
LOSC = 0 configures the mux to be controlled by LOS
LO, which is driven by the output of the LOS quick trip
(Table 02h, Registers BEh and BFh). The mux setting
(stored in EEPROM) does not take effect until V CC >
POA, allowing the EEPROM to recall.
IN1, RSEL, OUT1, RSELOUT
The digital input IN1 and RSEL pins primarily serve to
meet the rate-select requirements of SFP and SFP+.
They also serve as general-purpose inputs. OUT1 and
V CC
RSELOUT are driven by a combination of the IN1,
RSEL, and logic dictated by control registers in the
EEPROM (Figure 13). The levels of IN1 and RSEL can
be read using the STATUS register (Lower Memory,
Register 6Eh). The open-drain output OUT1 can be
controlled and/or inverted using the CNFGB register
(Table 02h, Register 8Ah). The open-drain RSELOUT
output is software-controlled and/or inverted through
the Status register and CNFGA register (Table 02h,
Register 89h). External pullup resistors must be provid-
ed on OUT1 and RSELOUT to realize high logic levels.
TXF, TXD, TXDOUT
TXDOUT is generated from a combination of TXF, TXD,
and the internal signal FETG. A software control identi-
cal to TXD is available (TXDC, Lower Memory, Register
6Eh). A TXD pulse is internally extended (TXD EXT ) by
time t INITR1 to inhibit the latching of low alarms and
warnings related to the APC loop to allow for the loop to
stabilize. The nonlatching alarms and warnings are TXP
LO, LOS LO, and MON1–MON4 LO alarms and warn-
ings. In addition, TXP LO is disabled from creating
FETG. TXF is both an input and an output (Figure 12).
See the Transmit Fault (TXF) Output section for a
detailed explanation of TXF. Figure 12 shows that the
R PU
TXDS
SET BIAS REGISTER TO 0 AND
MAX3798/MAX3799
SET_IMOD TO 0
TXD
TXD
TXDC
C
C
R
Q
Q
FETG
TXDIO
TXDFG
TXDOUT
TXP HI FLAG
D
S
TXDFLT
TXP HI ENABLE
BIAS MAX
BIAS MAX ENABLE
HBAL FLAG
HBAL ENABLE
TXP LO FLAG
TXP LO ENABLE
FAULT RESET TIMER
MINT
HBAL FLAG
TXP HI FLAG
TXP LO FLAG
BIAS MAX FLAG
TXF
TXF
TXD EXT
OUT
(130ms)
IN
POWER-ON
Figure 12. Logic Diagram 1
IN
OUT
RESET
______________________________________________________________________________________
21
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相关代理商/技术参数 |
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| DS1874T+ | 功能描述:ADC / DAC多通道 SFP+ Controller w/ Dgtl 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 |
| DS1874T+T&R | 制造商:Maxim Integrated Products 功能描述:SFP+ CONTROLLER WITH DIGITAL LDD INTERFACE - Tape and Reel 制造商:Maxim Integrated Products 功能描述:MXMDS1874T+T&R SFP+ CTRLR FOR USE W/MAX3 制造商:Maxim Integrated Products 功能描述:IC CTLR SFP+ ANLG LDD 28-TQFN |
| DS1874T+T&R | 功能描述:ADC / DAC多通道 SFP+ Controller w/ Dgtl 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 |
| DS1874T+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:SFP+ Controller with Digital LDD Interface |
| DS1875 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:PON Triplexer and SFP Controller |
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