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參數(shù)資料
| 型號： | ADE7763ARS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 電源管理 |
| 英文描述： | Single-Phase Active and Apparent Energy Metering IC |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20 |
| 封裝： | MO-150AE, SSOP-20 |
| 文件頁數(shù)： | 20/56頁 |
| 文件大?。?/td> | 1328K |
| 代理商： | ADE7763ARS |
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ADE7763
Antialias Filter
Figure 39 also shows an analog low-pass filter (RC) on the input
to the modulator. This filter prevents aliasing, which is an
artifact of all sampled systems. Aliasing means that frequency
components in the input signal to the ADC that are higher than
half the sampling rate of the ADC appear in the sampled signal
at a frequency below half the sampling rate. Figure 41 illustrates
the effect. Frequency components (shown as arrows) above half
the sampling frequency (also known as the Nyquist frequency,
i.e., 447 kHz) are imaged or folded back down below 447 kHz.
This happens with all ADCs, regardless of the architecture. In
the example shown, only frequencies near the sampling
frequency, i.e., 894 kHz, move into the band of interest for
metering, i.e., 40 Hz to 2 kHz. This allows the use of a very
simple LPF (low-pass filter) to attenuate high frequency (near
900 kHz) noise, and it prevents distortion in the band of interest.
For conventional current sensors, a simple RC filter (single-pole
LPF) with a corner frequency of 10 kHz produces an attenuation
of approximately 40 dB at 894 kHz—see Figure 41. The 20 dB
per decade attenuation is usually sufficient to eliminate the effects
of aliasing for conventional current sensors; however, for a di/dt
sensor such as a Rogowski coil, the sensor has a 20 dB per decade
gain. This neutralizes the –20 dB per decade attenuation
produced by one simple LPF. Therefore, when using a di/dt
sensor, care should be taken to offset the 20 dB per decade gain.
One simple approach is to cascade two RC filters to produce the
–40 dB per decade attenuation.
Rev. A | Page 20 of 56
SAMPLING
FREQUENCY
IMAGE
FREQUENCIES
ALIASING EFFECTS
0
2
447
894
FREQUENCY (kHz)
0
Figure 41. ADC and Signal Processing in Channel 1 Outline Dimensions
ADC Transfer Function
The following expression relates the output of the LPF in the
Σ
- ADC to the analog input signal level. Both ADCs in the
ADE7763 are designed to produce the same output code for the
same input signal level.
(
)
3.0492
262,144
IN
OUT
V
V
Code ADC
=
×
×
(1)
Therefore, with a full-scale signal on the input of 0.5 V and an
internal reference of 2.42 V, the ADC output code is nominally
165,151, or 0x2851F. The maximum code from the ADC is
±262,144; this is equivalent to an input signal level of ±0.794 V.
However, for specified performance, do not exceed the 0.5 V
full-scale input signal level.
Reference Circuit
Figure 42 shows a simplified version of the reference output
circuitry. The nominal reference voltage at the REF
IN/OUT
pin is
2.42 V. This is the reference voltage used for the ADCs. However,
Channel 1 has three input range options that are selected by
dividing down the reference value used for the ADC in
Channel 1. The reference value used for Channel 1 is divided
down to and of the nominal value by using an internal
resistor divider, as shown in Figure 42.
60
μ
A
PTAT
2.5V
1.7k
12.5k
12.5k
12.5k
12.5k
REF
IN/OUT
2.42V
MAXIMUM
LOAD = 10
μ
A
OUTPUT
IMPEDANCE
6k
REFERENCE INPUT
TO ADC CHANNEL 1
(RANGE SELECT)
2.42V, 1.21V, 0.6V
0
Figure 42. Reference Circuit Output
The REF
IN/OUT
pin can be overdriven by an external source such as
a 2.5 V reference. Note that the nominal reference value supplied
to the ADCs is now 2.5 V, not 2.42 V, which increases the
nominal analog input signal range by 2.5/2.42 × 100% = 3% or
from 0.5 V to 0.5165 V.
The voltage of the ADE7763 reference drifts slightly with changes
in temperature—see Table 1 for the temperature coefficient
specification (in ppm/°C). The value of the temperature drift
varies from part to part. Because the reference is used for the
ADCs in both Channels 1 and 2, any x% drift in the reference
results in 2x% deviation in the meter accuracy. The reference
drift that results from a temperature change is usually very
small, typically much smaller than the drift of other components
on a meter. However, if guaranteed temperature performance is
needed, use an external voltage reference. Alternatively, the
meter can be calibrated at multiple temperatures. Real-time
compensation can be achieved easily by using the on-chip
temperature sensor.
CHANNEL 1 ADC
Figure 43 shows the ADC and signal processing chain for
Channel 1. In waveform sampling mode, the ADC outputs a
signed, twos complement, 24-bit data-word at a maximum of
27.9 kSPS (CLKIN/128). With the specified full-scale analog
input signal of 0.5 V (or 0.25 V or 0.125 V—see the Analog
Inputs section), the ADC produces an output code that is
approximately between 0x28 51EC (+2,642,412d) and
0xD7 AE14 (–2,642,412d)—see Figure 43.
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| ADE7763ARSRL | Single-Phase Active and Apparent Energy Metering IC |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADE7763ARSRL | 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP T/R |
| ADE7763ARSZ | 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測量 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:* |
| ADE7763ARSZ | 制造商:Analog Devices 功能描述:IC, SINGLE PHASE ENERGY METER, SSOP-20 |
| ADE7763ARSZRL | 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測量 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:* |
| ADE7763ARSZRL | 制造商:Analog Devices 功能描述:IC, SINGLE PHASE ENERGY METER, SSOP-20 |
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