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| 型号： | MCP3905A-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 16/32页 |
| 文件大小： | 0K |
| 描述： | IC POWER METERING-1 PHASE 24SSOP |
| 产品培训模块： | MCP3901 Analog Front End |
| 标准包装： | 59 |
| 输入阻抗： | 390 千欧 |
| 测量误差： | 0.1% |
| 电压 - 高输入/输出： | 2.4V |
| 电压 - 低输入/输出： | 0.85V |
| 电流 - 电源： | 2.7mA |
| 电源电压： | 4.5 V ~ 5.5 V |
| 测量仪表类型： | 单相 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 677 (CN2011-ZH PDF) |
| 配用： | MCP3905RD-PM1-ND - REFERENCE DESIGN FOR MCP3905 MCP3905EV-ND - BOARD DEMO FOR MCP3905 |
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MCP3905A/05L/06A
4.1
Analog Inputs
4.2
16-Bit Delta-Sigma A/D Converters
The MCP3905A/05L/06A analog inputs can be
connected directly to the current and voltage
transducers (such as shunts or current transformers).
Each input pin is protected by specialized ESD
structures that are certified to pass 5 kV HBM and
500V MM contact charge. These structures also allow
up to ±6V continuous voltage to be present at their
inputs without the risk of permanent damage.
Both channels have fully differential voltage inputs for
better noise performance. The absolute voltage at each
pin relative to A GND should be maintained in the ±1V
range during operation in order to ensure the
measurement error performance. The common-mode
signals should be adapted to respect both the previous
conditions and the differential input voltage range. For
best performance, the common-mode signals should
be referenced to A GND .
The current channel comprises a PGA on the front-end
to allow for smaller signals to be measured without
additional signal conditioning. The maximum differen-
tial voltage specified on Channel 0 is equal to
±470 mV/Gain (see Table 4-1 ). The maximum peak
voltage specified on Channel 1 is equal to ±660 mV.
.
TABLE 4-1: MCP3905A/MCP3905L GAIN
SELECTIONS
The ADCs used in the MCP3905A/05L/06A for both
current and voltage channel measurements are delta-
sigma ADCs. They comprise a second-order, delta-
sigma modulator using a multi-bit DAC and a third-
order SINC filter. The delta-sigma architecture is very
appropriate for the applications targeted by the
MCP3905A/05L/06A because it is a waveform-oriented
converter architecture that can offer both high linearity
and low distortion performance throughout a wide input
dynamic range. It also creates minimal requirements
for the anti-aliasing filter design. The multi-bit
architecture used in the ADC minimizes quantization
noise at the output of the converters without disturbing
the linearity.
Both ADCs have a 16-bit resolution, allowing wide input
dynamic range sensing. The oversampling ratio of both
converters is 64. Both converters are continuously
converting during normal operation. When the MCLR
pin is low, both converters will be in Reset and output
code 0x0000h. If the voltage at the inputs of the ADC is
larger than the specified range, the linearity is no longer
specified. However, the converters will continue to
produce output codes until their saturation point is
reached. The DC saturation point is around 700 mV for
Channel 0 and 1V for Channel 1, using internal voltage
reference.
G1
0
0
1
1
G0
0
1
0
1
CH0 Gain
1
2
8
16
Maximum
CH0 Voltage
±470 mV
±235 mV
±60 mV
±30 mV
The clocking signals for the ADCs are equally
distributed between the two channels in order to
minimize phase delays to less than 1 MCLK period
(see Section 3.2 “High-Pass Filter Input Logic Pin
(HPF)” ). The SINC filter’s main notch is positioned at
MCLK/256 (14 kHz with MCLK = 3.58 MHz), allowing
the user to be able to measure wide harmonic content
TABLE 4-2:
MCP3906A GAIN
SELECTIONS
on either channel. The magnitude response of the
SINC filter is shown in Figure 4-2 .
G1
0
0
1
1
G0
0
1
0
1
CH0 Gain
1
32
8
16
Maximum
CH0 Voltage
±470 mV
±15 mV
±60 mV
±30 mV
0
-20
-40
-60
-80
-100
-120
0
5
10
15
20
25
30
Frequency (kHz)
FIGURE 4-2:
SINC Filter Magnitude
Response (MCLK = 3.58 MHz).
DS22011B-page 16
? 2006-2011 Microchip Technology Inc.
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参数描述 |
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| MCP3905AT-E/SS | 功能描述:模数转换器 - ADC Energy Meter IC Gain 116 5001 Dynamic E 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 |
| MCP3905AT-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 |
| MCP3905EV | 功能描述:电源管理IC开发工具 MCP3905 Energy Mtr IC Eval Brd RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| 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:* |
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