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参数资料
| 型号： | DS1877T+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/65页 |
| 文件大小： | 0K |
| 描述： | IC CTLR/MON SFP 1-2CH 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | SFP+ 控制器 |
| 输入类型： | 逻辑 |
| 输出类型： | 逻辑 |
| 接口： | I²C |
| 电流 - 电源： | 2.5mA |
| 安装类型： | 表面贴装 |
| 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) |
| 其它名称： | 90-1877T+TRL |
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18
Maxim Integrated
SFP Controller for Dual Rx Interface
DS1877
Any time VCC is above POD, the I2C interface can be
used to determine if VCC is below the POA level. This is
accomplished by checking the RDYB bit in the STATUS
byte (Lower Memory, Register 6Eh). RDYB is set when
VCC is below POA; when VCC rises above POA, RDYB
is timed (within 500Fs) to go to 0, at which point the part
is fully functional.
For all device addresses sourced from EEPROM
(Table 02h, Register 8Bh), the default device address
is A2h until VCC exceeds POA, allowing the device
address to be recalled from the EEPROM.
Delta-Sigma Outputs
The device’s delta-sigma outputs are 10 bits. For illustra-
tive purposes, a 3-bit example is provided in Figure 8.
Each possible output of this 3-bit delta-sigma DAC is
provided in Figure 9.
In LUT mode the DACs are each controlled by an LUT
with high-temperature resolution and an OFFSET LUT
with lower temperature resolution. The high-resolution
LUTs each have 2NC resolutions. The OFFSET LUTs are
located in the upper eight registers (F8h–FFh, Table 04h)
of the table containing each high-resolution LUT. The
DAC values are determined as follows:
DAC value = DAC LUT + 4 x (DAC OFFSET LUT)
An example calculation for DAC1 is as follows:
Assumptions:
1) Temperature is +43NC
2) Table 04h (DAC OFFSET LUT), Register FCh = 2Ah
3) Table 04h (DAC LUT), Register AAh = 7Bh
Because the temperature is +43NC, the DAC LUT index
is AAh and the DAC1 OFFSET LUT index is FCh.
DAC1 = 7Bh + 4 x 2Ah = 123h = 291
When temperature controlled, the DACs are updated
after each temperature conversion. See Figure 10.
The reference input, REFIN, is the supply voltage for the
output buffer of all the DACs. The voltage connected to
REFIN must be able to support the edge rate require-
ments of the delta-sigma outputs. In a typical applica-
tion, a 0.1FF capacitor should be connected between
REFIN and ground.
Figure 8. Recommended RC Filter for DAC Outputs
Figure 9. 3-Bit (8-Position) Delta-Sigma Example
DS1877
DAC
3.24k
3.24k
0.01F
VOLTAGE OUTPUT
DS1877
DAC
1k
1k
0.1F
CURRENT SINK
2k
O
1
2
3
4
5
6
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1878 | 制造商:MAXIM 制造商全称: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 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 |
| DS1878T TR | 制造商:MAXIM 制造商全称: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 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 |
| DS1878T+T | 功能描述:ADC / DAC多通道 SFP+ Controller w/ MAX3946&3945 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 |
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