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| 型号： | DS1878T+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/101页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SFP W/DGTL LDD RX 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： | 模拟，数字 |
| 输出类型： | 数字 |
| 接口： | I²C，LDD，串行 |
| 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) |
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DS1878
is timed (within 500s) to go to 0, at which point the
part is fully functional.
For all device addresses sourced from EEPROM (Table
02h, Register 8Ch), the default device address is A2h
until VCC exceeds POA, allowing the device address to
be recalled from the EEPROM.
Power-On Analog (POA)
POA holds the device in reset until VCC is at a suitable
level (VCC > POA) for the device to accurately measure
with its ADC and compare analog signals with its quick-
trip monitors. Because VCC cannot be measured by the
ADC when VCC is less than POA, POA also asserts the
VCC LO alarm, which is cleared by a VCC ADC conver-
sion greater than the customer-programmable VCC LO
ADC limit. This allows a programmable limit to ensure
that the headroom requirements of the transceiver are
satisfied during a slow power-up. The TXFOUT output
does not latch until there is a conversion above the
VCC LO limit. The POA alarm is nonmaskable. The TXF
output is asserted when VCC is below POA. See the
Low-Voltage Operation section for more information.
Delta-Sigma Outputs (DAC1 and DAC2)
Two delta-sigma outputs are provided, DAC1 and
DAC2. With the addition of an external RC filter, these
outputs provide two 9-bit resolution analog outputs with
the full-scale range set by the input REFIN. Each output
is either manually controlled or controlled using a tem-
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 tINIT,
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 11.
The device’s delta-sigma outputs are 9 bits. For illustra-
tive purposes, a 3-bit example is provided in Figure 12.
20
______________________________________________________________________________________
DS1878
DAC
3.24k
Ω
3.24k
Ω
0.01
μF
0.01
μF
VOLTAGE OUTPUT
DS1878
DAC
1k
Ω
1k
Ω
0.1
μF
0.1
μF
CURRENT SINK
2k
Ω
SFP+ Controller with Digital LDD Interface
O
1
2
3
4
5
6
7
Figure 12. Delta-Sigma Outputs
Figure 11. Recommended RC Filter for DAC1/DAC2
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| DS1880E-050 | 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| DS1880E-050/T&R | 制造商:Maxim Integrated Products 功能描述:DUAL LOG POT + EQUALIZER T&R - Tape and Reel |
| DS1880E-050/T&R | 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
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