参数资料
| 型号： | MCP3905EV |
| 厂商： | Microchip Technology |
| 文件页数： | 18/30页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO FOR MCP3905 |
| 产品培训模块： | MCP3901 Analog Front End |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MCP3905/6 |
| 主要属性： | 1 相 120/220 VAC 板载无变压器 AC/DC 5V 电源 |
| 已供物品： | 板，CD |
| 产品目录页面： | 677 (CN2011-ZH PDF) |
| 相关产品： | MCP3905L-I/SS-ND - IC POWER METERING-1 PHASE 24SSOP MCP3905LT-I/SSTR-ND - IC POWER METERING-1 PHASE 24SSOP MCP3906AT-I/SS-ND - IC POWER METERING-1 PHASE 24SSOP MCP3905AT-I/SS-ND - IC POWER METERING-1 PHASE 24SSOP MCP3906A-I/SS-ND - IC POWER METERING-1 PHASE 24SSOP MCP3905A-I/SS-ND - IC POWER METERING-1 PHASE 24SSOP |
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MCP3905/06
4.6
Low-Pass Filter and DTF
The output of the low-pass filter is accumulated in the
Converter
The MCP3905/06 low-pass filter is a first-order IIR filter
that extracts the active (real) power information
(DC component) from the instantaneous power signal.
The magnitude response of this filter is detailed in
signal has harmonic content (coming from the 2 ω
components of the inputs), and since the filter is not
ideal, there will be some ripple at the output of the
low-pass filter at the harmonics of the line frequency.
The cut-off frequency of the filter (8.9 Hz) has been
chosen to have sufficient rejection for commonly-used
line frequencies (50 Hz and 60 Hz). With a standard
input clock (MCLK = 3.58 MHz) and a 50 Hz line
frequency, the rejection of the 2 ω component (100 Hz)
will be more than 20 dB. This equates to a 2 ω
component containing 10 times less power than the
main DC component (i.e., the average active (real)
power).
0
-5
-10
-15
-20
-25
-30
-35
-40
DTF converter. This accumulation is compared to a
different digital threshold for F OUT0/1 and HF OUT ,
representing a quantity of real energy measured by the
part. Every time the digital threshold on F OUT0/1 or
HF OUT is crossed, the part will output a pulse
Frequencies” ).
The equivalent quantity of real energy required to
output a pulse is much larger for the F OUT0/1 outputs
than the HF OUT . This is such that the integration period
for the F OUT0/1 outputs is much larger. This larger
integration period acts as another low-pass filter so that
the output ripple due to the 2 ω components is minimal.
However, these components are not totally removed,
since realized low-pass filters are never ideal. This will
create a small jitter in the output frequency. Averaging
the output pulses with a counter or a Microcontroller
Unit (MCU) in the application will then remove the small
sinusoidal content of the output frequency and filter out
the remaining 2 ω ripple.
HF OUT is intended to be used for calibration purposes
due to its instantaneous power content. The shorter
integration period of HF OUT demands that the 2 ω
component be given more attention. Since a sinusoidal
signal average is zero, averaging the HF OUT signal in
steady-state conditions will give the proper real energy
value.
0.1
1
10
100
1000
Frequency (Hz)
FIGURE 4-5:
LPF Magnitude Response
(MCLK = 3.58 MHz).
DS21948E-page 18
? 2009 Microchip Technology Inc.
相关PDF资料 |
PDF描述 |
|---|---|
| MCP402XEV | BOARD EVAL FOR MCP402X |
| MCP42XXEV | BOARD EVALUATION MCP42XX |
| MCP43XXEV | BOARD EVALUATION MCP43XX |
| MCP46XXDM-PTPLS | BOARD PICTAIL DIGI POT MCP4XXX |
| MCP46XXEV | EVAL BOARD FOR MCP46XX |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP3905-I/SS | 功能描述:IC ENERGY METER 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 能量测量 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:* |
| MCP3905L | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Energy-Metering ICs with Active (Real) Power Pulse Output |
| MCP3905L-E/SS | 功能描述:模数转换器 - ADC Energy Meter IC Gain Dynamic Range RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MCP3905L-I/SS | 功能描述:模数转换器 - ADC Dynamic Range Energy Meter IC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MCP3905LT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Energy-Metering ICs with Active (Real) Power Pulse Output |
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