- 您现在的位置：买卖IC网 > Sheet目录1214 > EVAL-ADE7754EBZ (Analog Devices Inc)BOARD EVALAUTION FOR ADE7754
ADE7754
ALIASING EFFECTS
For example, when 7FFh is written to the active power gain
register, the ADC output is scaled up by 50%: 7FFh = 2047d,
IMAGE
FREQUENCIES
SAMPLING
FREQUENCY
2047/212 = 0.5. Similarly, 800h = –2047d (signed twos comple-
ment) and ADC output is scaled by –50%. These two examples
are illustrated in Figure 10.
Current Channel Sampling
The waveform samples of the current channel inputs may also
0
2
417
833
be routed to the waveform register (wavmode register to select
FREQUENCY (kHz)
Figure 9. ADC and Signal Processing in Current
Channel or Voltage Channel
CURRENT CHANNEL ADC
Figure 10 shows the ADC and signal processing chain for the
input IA of the current channels (which are the same for IB and
IC). In waveform sampling mode, the ADC outputs are signed
twos complement 24-bit data-word at a maximum of 26 kSPS
(kilo samples per second). The output of the ADC can be
scaled by ± 50% by using the APGAINs register. While the
ADC outputs are 24-bit twos complement value, the maximum
full-scale positive value from the ADC is limited to 400000h
(+4,194,304d). The maximum full-scale negative value is lim-
the speed and the phase) to be read by the system master
(MCU). The active energy and apparent energy calculation remains
uninterrupted during waveform sampling.
When in waveform sample mode, one of four output sample
rates may be chosen using Bits 3 and 4 of the WAVMODE
register (DTRT[1:0] mnemonic). The output sample rate
may be 26.0 kSPS, 13.0 kSPS, 6.5 kSPS, or 3.3 kSPS. See the
Waveform Mode Register section. By setting the WSMP bit in
the interrupt enable register to Logic 1, the interrupt request
output IRQ will go active low when a sample is available. The
timing is shown in Figure 11. The 24-bit waveform samples are
transferred from the ADE7754 one byte (eight bits) at a time,
with the most significant byte shifted out first.
ited to C00000h (–4,194,304d). If the analog inputs are
overranged, the ADC output code clamps at these values. With
the specified full-scale analog input signal of ± 0.5 V, the ADC
produces an output code between D70A3Eh (–2,684,354) and
28F5C2h (+2,684,354), as illustrated in Figure 10, which also
shows a full-scale voltage signal being applied to the differential
IRQ
SCLK
DIN
DOUT
READ FROM WAVEFORM
0 0 09h
SG N
inputs I AP and I AN .
Current Channel ADC Gain Adjust
The ADC gain in each phase of the current channel can be
adjusted using the multiplier and active power gain register
(AAPGAIN[11:0], BAPGAIN, and CAPGAIN). The gain of the
ADC is adjusted by writing a twos complement 12-bit word to
the active power gain register. The following expression shows
how the gain adjustment is related to the contents of that register:
CURRENT CHANNEL DATA – 24 BITS
Figure 11. Waveform Sampling Current Channel
The interrupt request output IRQ stays low until the interrupt
routine reads the reset status register. See the Interrupt section.
Note that if the WSMP bit in the interrupt enable register is not
set to Logic 1, no data is available in the waveform register.
Code = ? ADC × ? 1 +
? ?
? ?
? ?
? ?
AAPGAIN ? ?
2 12
CURRENT RMS
REFERENCE
CALCULATION
1,
2,
4
WAVEFORM SAMPLE
V IN
I AP
GAIN[1:0]
PGA1
ADC
1
MULTIPLIER
1
DIGITAL LPF
SINC 3
24
HPF
REGISTER
ACTIVE AND REACTIVE
POWER CALCULATION
I AN
12
V IN
100% FS
800h–7FFh
AAPGAIN[11:0]
3D70A3h
CHANNEL 1
+ 150% FS
0.5V/GAIN1
28F5C2h
+ 100% FS
0V
400000h
147AE1h
+ 50% FS
28F5C2h
+100% FS
00000h
EB851Fh
AAPGAIN[11:0]
– 50% FS
ANALOG
INPUT
000000h
D70A3Eh
– 100% FS
RANGE
D70A3Eh
–100% FS
C28F5Dh
000h
7FFh
800h
– 150% FS
C00000h
ADC OUTPUT
WORD RANGE
Figure 10. ADC and Signal Processing in Current Channel
REV. 0
–11 –
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
EVAL-ADE7755ZEB
BOARD EVALUATION FOR AD7755
EVAL-ADE7758ZEB
BOARD EVAL FOR AD7758
EVAL-ADE7759EBZ
BOARD EVALUATION FOR ADE7759
EVAL-ADE7762EBZ
BOARD EVALUATION FOR ADE7762
EVAL-ADE7763ZEB
BOARD EVALUATION FOR ADE7763
EVAL-ADE7816EBZ
BOARD EVALUATION FOR ADE7816
EVAL-ADE7878EBZ
BOARD EVAL FOR ADE7878
EVAL-ADE7880EBZ
BOARD EVAL FOR ADE7880
相关代理商/技术参数
EVAL-ADE7755EB
制造商:Analog Devices 功能描述:EVAL BOARD ENERGY METERINGW/PULSE OUTPUT - Bulk
EVAL-ADE7755EBZ
制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with Pulse Output
EVAL-ADE7755EBZ1
制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with Pulse Output
EVAL-ADE7755ZEB
功能描述:BOARD EVALUATION FOR AD7755 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:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-ADE7756EB
制造商:Analog Devices 功能描述:EVAL BD DOCUMENTATION ADE7756 ENERGY METERING IC - Bulk 制造商:Rochester Electronics LLC 功能描述:
EVAL-ADE7757AEBZ
制造商:Analog Devices 功能描述:EVALUATION BOARDS - Bulk
EVAL-ADE7757EB
制造商:Analog Devices 功能描述:EVAL BOARD ENERGY METERINGW/PULSE OUTPUT - Bulk
EVAL-ADE7758ZEB
功能描述:BOARD EVAL FOR AD7758 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:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源