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ADuCM350BBCZ 数据表(PDF) 33 Page - Analog Devices

部件名 ADuCM350BBCZ
功能描述  16-Bit Precision, Low Power Meter On A
PDF  41 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADuCM350BBCZ 数据表(HTML) 33 Page - Analog Devices

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ADuCM350
Data Sheet
Rev. A | Page 32 of 40
MEASUREMENT STAGE
The AFE consists of a multiplexed input, 160 kSPS, 16-bit ADC
with four dedicated voltage measurement channels and up to
eight multiplexed current measurement channels using the on-
chip transimpedance amplifier. The multiplexed channels are
filtered and differentially buffered prior to data conversion.
The ADC data can be interrogated using three methods.
• By raw data at 160 kSPS.
• At the output of a 50 Hz/60 Hz filter at 900 SPS.
• Through a discrete Fourier transform (DFT) engine.
The power line filter is optimized for fast settling, just 36.6 ms
settling. Data at 900 SPS can be further decimated by the user
without requiring additional filtering.
Figure 39. Power Line Rejection Modeling
The DFT engine performs a 2048-point single frequency
discrete Fourier transform. It takes the 16-bit ADC output and
converts it to complex impedance with real and imaginary
components. As the ADC samples at 160 kSPS, this allows for a
79.5 Hz signal energy bandwidth, which gives excellent
rejection of interferers.
Figure 40. Frequency Response, 2048-Point DFT at 20 kHz
Figure 41. Rx Stage
0
–20
–40
–60
–80
–100
0
100
200
300
400
500
FREQUENCY (Hz)
NOTCHES ARCHITECTED AT 50Hz
AND 60Hz TO REJECT POWER LINE
INTERFERENCE
FREQUENCY (Hz)
600
700
800
900
0
500
1000
1500
2000
2500
3000
3500
4000
0
–20
–40
–60
–80
–100
FREQUENCY (Hz)
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
100
50
0
–50
–100
–150
–200
RTIA
CTIA
TIA_I
TIA_O
VBIAS
AN_A
AN_B
AN_C
AN_D
DVDD/2
VCCM
VBIAS
ADC
VREF = 1.8V
+
–
+
–
+
+
–
–
+
–
+
–
+
–
AVDD/2
TEMPERATURE
SENSOR
PRECISION
REFERENCE
VREF



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