參數(shù)資料
型號(hào)： ADE7753ARSRL
廠商： ANALOG DEVICES INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： Active and Apparent Energy Metering IC with di/dt sensor interface
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO20
封裝： MO-150AE, SSOP-20
文件頁數(shù)： 11/38頁
文件大?。?/td> 449K
代理商： ADE7753ARSRL
ADE7753
–11–
REV. PrF 10/02
PRELIMINARY TECHNICAL DATA
ZE RO CROSSING DE T E CT ION
T he AD E7753 has a zero crossing detection circuit on
Channel 2. T his zero crossing is used to produce an external
zero cross signal (ZX ) and it is also used in the calibration
mode - see
Energy Calibration
. T he zero crossing signal is also
used to initiate a temperature measurement on the ADE7753
- see
Temperature Measurement
.
Figure 10 shows how the zero cross signal is generated from
the output of LPF1.
V2P
V2N
ADC 2
PGA2
1
x1, x2, x4,
x8, x16
GAIN[7:5]
REFERENCE
V2
TO
MULTIPLIER
-63% to + 63% FS
LPF1
f
-3dB
= 140Hz
ZERO
CROSS
ZX
V2
LPF1
ZX
23.2
8
@ 60Hz
1.0
Figure 10– Zero cross detection on Channel 2
T he ZX signal will go logic high on a positive going zero
crossing and logic low on a negative going zero crossing on
Channel 2. T he zero crossing signal ZX is generated from the
output of LPF1. LPF1 has a single pole at 156Hz (at CLK IN
= 3.579545MHz). As a result there will be a phase lag
between the analog input signal V2 and the output of LPF1.
T he phase response of this filter is shown in the
Channel 2
Sampling
section of this data sheet. T he phase lag response of
LPF1 results in a time delay of approximately 0.97ms (@
60Hz) between the zero crossing on the analog inputs of
Channel 2 and the rising or falling edge of ZX .
T he zero-crossing detection also drives one flag bit in the
interrupt status register. An active low in the IRQ output will
also appear if the corresponding bit in the Interrupt Enable
register is set to logic one.
T he flag in the Interrupt status register as well as the IRQ
output are reset to their default value when the Interrupt
Status register with reset (RST ST AT US) is read.
Zero Crossing T imeout
T he zero crossing detection also has an associated time-out
register Z X T OU T . T his unsigned, 12-bit register is
decremented (1 LSB) every 128/CLK IN seconds. T he reg-
ister is reset to its user programmed full scale value every time
a zero crossing on Channel 2 is detected. T he default power
on value in this register is FFFh. If the register decrements
to zero before a zero crossing is detected and the DISSAG bit
in the Mode register is logic zero, the
SAG
pin will go active
low. T he absence of a zero crossing is also indicated on the
IRQ
pin if the ZX T O enable bit in the Interrupt Enable
register is set to logic one. Irrespective of the enable bit
setting, the ZX T O flag in the Interrupt Status register is
always set when the ZX T OUT register is decremented to
zero - see
ADE7753 Interrupts
.
T he Zerocross T ime-out register can be written/read by the
user and has an address of 1Dh - see
Serial Interface
section. T he
resolution of the register is 128/CL K IN seconds per L SB.
T hus the maximum delay for an interrupt is 0.15 second
(128/CLK IN
×
2
12
).
Figure 11 shows the mechanism of the zero crossing time out
detection when the line voltage stays at a fixed DC level for
more than CL K IN/128 x ZX T OUT seconds.
Channel 2
ZXTO
detection bit
ZXTOUT
16-bit internal
register value
Figure 11 - Zero crossing Time out detection
PERIOD MEASUREMENT
T he ADE7753 provides also the period measurement of the
line. T he period register is an unsigned 15-bit register and is
updated every period.
T he resolution of this register is 2.2ms/L SB when
CLK IN=3.579545MHz, which represents 0.013% when the
line frequency is 60Hz. When the line frequency is 60Hz, the
value of the Period register is approximately 7576d. T he
length of the register enables the measurement of line
frequencies as low as 13.9Hz.
40
45
50
55
60
65
70
-90.05
-90
-89.95
-89.9
-89.85
-89.8
-89.75
-89.7
FREQUENCY-Hz
P
Figure 9– Combined phase response of the digital integra-
tor and phase compensator (40Hz to 70Hz)
Note that the integrator has a -20dB/dec attenuation and
approximately -90° phase shift. When combined with a di/dt
sensor, the resulting magnitude and phase response should be
a flat gain over the frequency band of interest. However, the
di/dt sensor has a 20dB/dec gain associated with it, and
generates significant high frequency noise, a more effective
anti-aliasing filter is needed to avoid noise due to aliasing—
see
Antialias Filter
.
When the digital integrator is switched off, the ADE7753 can
be used directly with a conventional current sensor such as
current transformer (CT ) or a low resistance current shunt.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADE7753ARSZ 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測(cè)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:*
ADE7753ARSZ 制造商:Analog Devices 功能描述:ENERGY METERING IC
ADE7753ARSZ 制造商:Analog Devices 功能描述:IC MULTIFUNCTION METER
ADE7753ARSZRL 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測(cè)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:*
ADE7753-ARSZRL 制造商:Analog Devices 功能描述:
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