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| 型号： | EVAL-ADE5169EBZ-2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 48/156页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD5169 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 嵌入式： | 是 |
| 已用 IC / 零件： | ADE5169 |
| 主要属性： | 用于汇编语言和 C 代码的 IAR 工具 |
| 次要属性： | 隔离和非隔离输出选项 |
| 已供物品： | 板，软件 |
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ADE5166/ADE5169/ADE5566/ADE5569
ANALOG-TO-DIGITAL CONVERSION
Each ADE5166/ADE5169/ADE5566/ADE5569 has two Σ-Δ
analog-to-digital converters (ADCs). The outputs of these ADCs
are mapped directly to waveform sampling SFRs (Address 0xE2
to Address 0xE7) and are used for energy measurement internal
digital signal processing. In PSM1 (battery) mode and PSM2
Data Sheet
ADE5169/ADE5566/ADE5569 is 4.096 MHz/5 (819.2 kHz);
and the band of interest is 40 Hz to 2 kHz. Oversampling has
the effect of spreading the quantization noise (noise due to
sampling) over a wider bandwidth. With the noise spread more
thinly over a wider bandwidth, the quantization noise in the band
of interest is lowered (see Figure 43).
DIGITAL
(sleep) mode, the ADCs are powered down to minimize power
consumption.
For simplicity, the block diagram in Figure 44 shows a first-order
SIGNAL
ANTIALIASING
FILTER (RC)
FILTER
SHAPED
NOISE
SAMPLING
FREQUENCY
Σ -? ADC. The converter is made up of the Σ -? modulator and
the digital low-pass filter (LPF).
NOISE
A Σ -? modulator converts the input signal into a continuous
serial stream of 1s and 0s at a rate determined by the sampling
0
2
409.6
FREQUENCY (kHz)
819.2
clock. In the ADE5166/ADE5169/ADE5566/ADE5569, the sam-
pling clock is equal to 4.096 MHz/5. The 1-bit DAC in the feedback
loop is driven by the serial data stream. The DAC output is
subtracted from the input signal. If the loop gain is high enough,
the average value of the DAC output (and, therefore, the bit stream)
SIGNAL
NOISE
HIGH RESOLUTION
OUTPUT FROM DIGITAL
LPF
can approach that of the input signal level.
For any given input value in a single sampling interval, the data
from the 1-bit ADC is virtually meaningless. Only when a large
number of samples is averaged is a meaningful result obtained.
This averaging is carried into the second part of the ADC, the
digital LPF. By averaging a large number of bits from the modu-
lator, the low-pass filter can produce 24-bit data-words that are
proportional to the input signal level.
The Σ -? converter uses two techniques to achieve high resolution
from what is essentially a 1-bit conversion technique. The first
is oversampling. Oversampling means that the signal is sampled
at a rate (frequency) that is many times higher than the bandwidth
of interest. For example, the sampling rate in the ADE5166/
0 2 409.6 819.2
FREQUENCY (kHz)
Figure 43. Noise Reduction Due to Oversampling and
Noise Shaping in the Analog Modulator
However, oversampling alone is not efficient enough to improve
the signal-to-noise ratio (SNR) in the band of interest. For example,
an oversampling ratio of 4 is required to increase the SNR by only
6 dB (one bit). To keep the oversampling ratio at a reasonable level,
it is possible to shape the quantization noise so that the majority
of the noise lies at the higher frequencies. In the Σ -? modulator,
the noise is shaped by the integrator, which has a high-pass type of
response for the quantization noise. The result is that most of
the noise is at the higher frequencies where it can be removed
by the digital LPF. This noise shaping is shown in Figure 43.
MCLK/5
ANALOG
LOW-PASS FILTER
INTEGRATOR
DIGITAL
LOW-PASS
R
C
+
–
LATCHED
COMPARATOR
FILTER
24
V REF
... 10100101 ...
1-BIT DAC
Figure 44. First-Order Σ -? ADC
Rev. D | Page 48 of 156
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相关代理商/技术参数 |
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| EVAL-ADE5169F62EBZ | 制造商:Analog Devices 功能描述:EVALUATION BOARD FOR ADE5169 - Boxed Product (Development Kits) 制造商:Rochester Electronics LLC 功能描述: |
| EVAL-ADE5569F62EBZ | 制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver |
| EVAL-ADE7169EBZ-2 | 功能描述:BOARD EVALUATION FOR ADE7169F16 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PCI Express® (PCIe) 主要目的:接口，收发器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要属性:- 次要属性:- 已供物品:板 |
| EVAL-ADE7169F16EB | 制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver |
| EVAL-ADE7169F16EBZ | 制造商:Analog Devices 功能描述:Evaluation Board For ADE7169 制造商:Analog Devices 功能描述:EVAL BD FOR ADE7169 - Bulk |
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