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参数资料
| 型号： | DS1876T+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/69页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR SFP DUAL LDD 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | SFP 激光控制器 |
| 输入类型： | 逻辑 |
| 输出类型： | 逻辑 |
| 接口： | I²C |
| 电流 - 电源： | 10mA |
| 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) |
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16
Maxim Integrated
SFP Controller with Dual LDD Interface
DS1876
For all device addresses sourced from EEPROM (Table
02h, Register 8Bh), the default device addresses are
A2h and B2h until VCC exceeds POA allowing the device
address to be recalled from the EEPROM.
Delta-Sigma Outputs
Four delta-sigma outputs are provided: MOD1, MOD2,
APC1, and APC2. With the addition of an external RC
filter, these outputs provide 10-bit resolution analog
outputs with the full-scale range set by the input REFIN.
Each output is either manually controlled or controlled
using a temperature-indexed LUT.
A delta-sigma DAC has 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 tINIT, the DAC outputs
are high impedance. The external RC filter components
are chosen based on ripple requirements, output load,
delta-sigma frequency, and desired response time.
Figure 6 shows a recommended filter.
For illustrative purposes, a 3-bit example is provided in
Figure 7.
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) of
the table containing each high-resolution LUT. The DAC
values are determined as follows:
DAC value = LUT + 4 x (OFFSET LUT)
An example calculation for MOD1 DAC is as follows:
Assumptions:
1) Temperature is +43NC
2) Table 04h (MOD1 OFFSET LUT), Register FCh = 2Ah
3) Table 04h (MOD1 LUT), Register AAh = 7Bh
Because the temperature is +43NC, the MOD1 LUT index
is AAh and the MOD1 OFFSET LUT index is FCh.
MOD1 DAC = 7Bh + 4 x 2Ah = 123h = 291
Figure 6. Recommended RC Filter for DAC Outputs in Voltage
Mode and Current Sink Mode
Figure 5. Low-Voltage Hysteresis Example
DS1876
DAC
3.24k
3.24k
0.01F
VOLTAGE OUTPUT
DS1876
DAC
1k
1k
0.1F
CURRENT SINK
2k
VPOA
VPOD
VCC
SEE
RECALLED VALUE
PRECHARGED
TO 0
PRECHARGED
TO 0
PRECHARGED TO 0
SEE RECALL
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1877 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:SFP Controller for Dual Rx Interface |
| DS1877T+ | 功能描述:ADC / DAC多通道 SFP+ Controller w/ Dual RX 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 |
| DS1877T+T&R | 制造商:Maxim Integrated Products 功能描述:SFP CTRLR FOR DUAL RX INTERFACE TQF - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CTLR/MON SFP 1-2CH 28TQFN |
| DS1877T+T&R | 功能描述:ADC / DAC多通道 SFP+ Controller w/ Dual RX 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 |
| DS1877T+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:SFP Controller for Dual Rx Interface |
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