参数资料
| 型号： | DS1873T+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 20/86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： | 托盘 |
| 安装类型： | 表面贴装 |
| 其它名称： | 90-1873T+000 |
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SFP+ Controller with Analog LDD Interface
MOD and DAC1 high-resolution LUTs each have 2°C
DAC
3.24k Ω
3.24k Ω
0.01 μ F
OUTPUT
0.01 μ F
resolution. The DAC2 high-resolution LUT has 4°C reso-
lution. The OFFSET LUTs are located in the upper eight
registers (F8h–FFh) of the table containing each high-
resolution LUT. MOD DAC, DAC1 VALUE, and DAC2
DS1873
Figure 10. Recommended RC Filter for DAC1/DAC2
standard digital PWM output given the same clock rate
and filter components. Before t INIT , the DAC outputs
are high impedance.
The external RC filter components are chosen based
on ripple requirements, output load, delta-sigma fre-
quency, and desired response time. A recommended
filter is shown in Figure 10.
The DS1873’s delta-sigma outputs are 10 bits. For illus-
trative purposes, a 3-bit example is provided. Each
possible output of this 3-bit delta-sigma DAC is given in
Figure 11.
In LUT mode, MOD, DAC1, and DAC2 are each con-
trolled by an LUT with high-temperature resolution and
an OFFSET LUT with lower temperature resolution. The
0
1
2
3
4
5
6
7
Figure 11. 3-Bit Delta-Sigma Example
VALUE are determined as follows:
MOD DAC = MOD LUT + 4 x (MOD OFFSET LUT)
DAC1 VALUE = DAC1 LUT + 4 x (DAC1 OFFSET LUT)
DAC2 VALUE = DAC1 LUT + 4 x (DAC1 OFFSET LUT)
Example calculation for MOD DAC:
Assumptions:
1) Temperature is 43°C.
2) Table 04h (MOD OFFSET LUT), Register FCh = 2Ah.
3) Table 04h (MOD LUT), Register A9h = 7Bh.
Because the temperature is 43°C, the MOD LUT index
is A9h and the MOD OFFSET LUT index is FCh.
MOD DAC = 7Bh + 4 x 2Ah = 123h = 291
When temperature controlled, the DACs are updated
after each temperature conversion.
The reference input, REFIN, is the supply voltage for all
four DACs. The voltage connected to REFIN and its
decoupling must be able to support the edge rate
requirements of the delta-sigma outputs.
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1873T+ | 功能描述:ADC / DAC多通道 SFP+ Ctrl w/Analog 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 |
| DS1873T+T&R | 制造商:Maxim Integrated Products 功能描述:5X5 TQFN SFP+ CTRL W/ANALOG - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CTLR SFP+ ANLG LDD 28-TQFN |
| DS1873T+T&R | 功能描述:ADC / DAC多通道 SFP+ Ctrl w/Analog 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 |
| DS1873T+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:SFP+ Controller with Analog LDD Interface |
| DS1874 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:SFP+ Controller with Digital LDD Interface |
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