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参数资料
| 型号： | DS1874T+T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 20/88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： | 2,500 |
| 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： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
| 其它名称： | 90-1874T+TRL |
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SFP+ Controller with Digital LDD Interface
is either manually controlled or controlled using a tem-
DAC1/DAC2
3.24k Ω
3.24k Ω
0.01 μ F
OUTPUT
0.01 μ F
perature-indexed LUT. A delta-sigma is a digital output
using pulse-density modulation. It provides much lower
output ripple than a standard digital PWM output given
the same clock rate and filter components. Before t INIT ,
DS1874
Figure 9. Recommended RC Filter for DAC1/DAC2
0
1
2
3
4
5
6
7
the DAC1 and DAC2 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 9.
The DS1874’s delta-sigma outputs are 9 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 10.
In LUT mode, DAC1 and DAC2 are each controlled by a
separate 8-bit, 4°C-resolution, temperature-addressed
LUT. The delta-sigma outputs use a 9-bit structure. The
8-bit LUTs are either loaded directly into the MSBs (8:1)
or the LSBs (7:0). This is determined by DAC1TI (Table
02h, Register C3h), DAC2TI (Table 02h, Register C4h),
DAC1TC (Table 02h, Register C6h, bit 6), and DAC2TC
(Table 02h, Register C6h, bit 5). See Figure 11 for more
details. The DAC1 LUT (Table 07h) and DAC2 LUT
(Table 08h) are nonvolatile and password-2 protected.
The reference input, REFIN, is the supply voltage for
the output buffer of DAC1 and DAC2. The voltage con-
nected to REFIN must be able to support the edge rate
requirements of the delta-sigma outputs. In a typical
application, a 0.1μF capacitor should be connected
between REFIN and ground.
Figure 10. Delta-Sigma Outputs
8
7
6
DAC[1/2]TI
DAC[1/2]TC = 0
8
7
6
DAC[1/2]TI
DAC[1/2]TC = 1
5
4
LUT LOADED TO [8:1]
(DAC BIT 0 = 0)
5
4
LUT LOADED TO [8:1]
(DAC BIT 0 = 0)
3
2
1
0
LUT LOADED TO [7:0]
3
2
1
0
LUT LOADED TO [7:0]
-40
TEMPERATURE ( ° C)
+102
-40
TEMPERATURE ( ° C)
+102
Figure 11. DAC1/DAC2 LUT Assignments
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1875 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:PON Triplexer and SFP Controller |
| DS1875RT+ | 制造商:Maxim Integrated Products 功能描述:PON TRIPLEXER AND SFP CONTROLLER - Rail/Tube |
| DS1875RT+T&R | 制造商:Maxim Integrated Products 功能描述:PON TRIPLEXER AND SFP CONTROLLER - Tape and Reel |
| DS1875T+ | 功能描述:ADC / DAC多通道 PON Triplexer & SFP Controller 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 |
| DS1875T+T&R | 制造商:Maxim Integrated Products 功能描述:PON TRIPLEXER 38TQFN EP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC SFP CTRLR/TRIPLEXER 38-TQFN 制造商:Maxim Integrated Products 功能描述:ADC / DAC Multichannel PON Triplexer & SFP Controller |
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