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參數(shù)資料
| 型號： | ADE7753ARSZRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO20 |
| 封裝： | ROHS COMPLIANT, MO-150AE, SSOP-20 |
| 文件頁數(shù)： | 43/60頁 |
| 文件大?。?/td> | 938K |
| 代理商： | ADE7753ARSZRL |
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ADE7753
Rev. C | Page 48 of 60
The impulse/LSB ratio used to convert the value in the
LVARENERGY register into a pulse output can be expressed in
terms of impulses/VARh and VARh/LSB.
imp/LSB =
nominal
expected
IB
VARCF
LSB
VARh
imp
)
(
/
=
×
(73)
VARCFIB(expected) =
)
sin(
s/h
3600
)
/
(
×
b
nominal
I
V
VARh
imp
t
VARConstan
(74)
VARCFIB(nominal) =
PERIOD
time
on
Accumulati
PERIOD
LVARENERGY
IB
×
(s)
Hz
50
(75)
where the accumulation time is calculated from Equation 37.
The line period can be determined from the PERIOD register
according to Equation 38. Then VAR can be determined from
the LVARENERGY register value:
VARh =
PERIOD
LSB
VARh
LVARENERGY
IB
Hz
50
/
×
(76)
VAR =
PERIOD
time
on
Accumulati
PERIOD
LSB
VARh
LVARENERGY
IB
×
(s)
s/h
3600
/
Hz
50
(77)
The PERIOD50 Hz/PERIOD factor in the preceding VAR equations
is the correction factor for the 1/f frequency attenuation of the
low-pass filter. The PERIOD50 Hz term refers to the line period at
calibration and could represent a frequency other than 50 Hz.
CLKIN FREQUENCY
In this data sheet, the characteristics of the ADE7753 are shown
when CLKIN frequency is equal to 3.579545 MHz. However, the
ADE7753 is designed to have the same accuracy at any CLKIN
frequency within the specified range. If the CLKIN frequency is
not 3.579545 MHz, various timing and filter characteristics need
to be redefined with the new CLKIN frequency. For example,
the cutoff frequencies of all digital filters such as LPF1, LPF2, or
HPF1, shift in proportion to the change in CLKIN frequency
according to the following equation:
MHz
Frequency
CLKIN
Frequency
Original
Frequency
New
579545
.
3
×
=
(78)
The change of CLKIN frequency does not affect the timing
characteristics of the serial interface because the data transfer is
synchronized with serial clock signal (SCLK). But one needs to
observe the read/write timing of the serial data transfer—see
various timing changes that are affected by CLKIN frequency.
Table 11. Frequency Dependencies of the ADE7753
Parameters
Parameter
CLKIN Dependency
Nyquist Frequency for CH 1 and CH 2 ADCs
CLKIN/8
PHCAL Resolution (Seconds per LSB)
4/CLKIN
Active Energy Register Update Rate (Hz)
CLKIN/4
Waveform Sampling Rate (per Second)
WAVSEL 1,0 =
0 0
CLKIN/128
0 1
CLKIN/256
1 0
CLKIN/512
1 1
CLKIN/1024
Maximum ZXTOUT Period
524,288/CLKIN
SUSPENDING ADE7753 FUNCTIONALITY
The analog and the digital circuit can be suspended separately.
The analog portion of the ADE7753 can be suspended by setting
the ASUSPEND bit (Bit 4) of the mode register to logic high—
see the Mode Register (0x9) section. In suspend mode, all wave-
form samples from the ADCs are set to 0. The digital circuitry
can be halted by stopping the CLKIN input and maintaining a
logic high or low on the CLKIN pin. The ADE7753 can be
reactivated by restoring the CLKIN input and setting the
ASUSPEND bit to logic low.
CHECKSUM REGISTER
The ADE7753 has a checksum register (CHECKSUM[5:0]) to
ensure the data bits received in the last serial read operation are
not corrupted. The 6-bit checksum register is reset before the
first bit (MSB of the register to be read) is put on the DOUT
pin. During a serial read operation, when each data bit becomes
available on the rising edge of SCLK, the bit is added to the
checksum register. In the end of the serial read operation, the
content of the checksum register is equal to the sum of all ones
in the register previously read. Using the checksum register, the
user can determine if an error has occurred during the last read
operation. Note that a read to the checksum register also
generates a checksum of the checksum register itself.
CONTENT OF REGISTER (n-bytes)
CHECKSUM REGISTER
ADDR: 0x3E
+
DOUT
02875-0-077
Figure 88. Checksum Register for Serial Interface Read
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ADE7753-ARSZRL | 制造商:Analog Devices 功能描述: |
| ADE7753XRS | 制造商:Analog Devices 功能描述: |
| ADE7754 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Poly-phase Multi-Function Energy Metering IC with Serial Port |
| ADE7754AR | 制造商:Analog Devices 功能描述:Energy Measurement 24-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:THREE PHASE ENERGY METER IC W/WATT & VA - Bulk 制造商:Analog Devices 功能描述:IC ENERGY METER |
| ADE7754ARRL | 制造商:Analog Devices 功能描述:Energy Measurement 24-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:THREE PHASE ENERGY METER IC W/WATT & VA - Bulk |
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