参数资料
| 型号： | DS1874T+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 15/88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
BIAS and MODULATION Registers as a
Function of Transmit Disable (TXD)
If TXD is asserted (logic 1) during normal operation, the
outputs are disabled within t OFF . When TXD is deassert-
ed (logic 0), the DS1874 sets the MODULATION regis-
ter with the value associated with the present
temperature, and initializes the BIAS register using the
same search algorithm as done at startup. When
asserted, soft TXD (TXDC) (Lower Memory, Register
6Eh) would allow a software control identical to the TXD
pin (see Figure 3).
APC and Quick-Trip Timing
As shown in Figure 4, the DS1874’s input comparator is
shared between the APC control loop and the quick-
trip alarms (TXP HI, TXP LO, LOS, and BIAS HI). The
comparator polls the alarms in a multiplexed sequence.
Five of every eight comparator readings are used for
a wide variety of external filtering options and time
delays resulting from writing values to the MAX3798/
MAX3799 ’s bias DAC. The UPDATE RATE register
(Table 02h, Register 88h) determines the sampling
time. Samples occur at a regular interval, t REP . Table 2
shows the sample rate options available. Any quick-trip
alarm that is detected by default remains active until a
subsequent comparator sample shows the condition no
longer exists. A second bias current monitor (BIAS
MAX) compares the MAX3798/MAX3799’s BIAS DAC’s
code to a digital value stored in the IBIASMAX register.
This comparison is made at every bias current update
to ensure that a high-bias current is quickly detected.
An APC sample that requires an update of the BIAS
register causes subsequent APC samples to be
Table 2. Update Rate Timing
APC loop bias-current control. The other three updates
are used to check the HTXP/LTXP (monitor diode volt-
age), the HBATH (MON1), and LOS (MON3) signals
against the internal APC, BIAS, and MON3 reference,
respectively. If the last APC comparison was higher
than the APC set point, it makes an HTXP comparison,
and if it is lower, it makes an LTXP comparison.
Depending on the results of the comparison, the corre-
sponding alarms and warnings (TXP HI, TXP LO) are
asserted or deasserted.
The DS1874 has a programmable comparator sample
time based on an internally generated clock to facilitate
TXD
APC_SR[2:0]
000b
001b
010b
011b
100b
101b
110b
111b
SAMPLE PERIOD (tREP)
(ns)
800
1200
1600
2000
2800
3200
4400
6400
Figure 3. TXD Timing
BIAS REGISTER
MODULATION REGISTER
t OFF
t OFF
t ON
t ON
APC QUICK-TRIP SAMPLE TIMES
HBIAS
SAMPLE
APC
SAMPLE
APC
SAMPLE
APC
SAMPLE
APC
SAMPLE
APC
SAMPLE
HTXP/LTXP
SAMPLE
LOS
SAMPLE
HBIAS
SAMPLE
APC
SAMPLE
t REP
Figure 4. APC Loop and Quick-Trip Sample Timing
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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