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AD7779 Datasheet(PDF) 20 Page - Analog Devices

Part # AD7779
Description  8-Channel, 24-Bit, Simultaneous Sampling ADC
PDF  97 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7779 Datasheet(HTML) 20 Page - Analog Devices

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AD7779
Data Sheet
Rev. 0 | Page 20 of 97
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0
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FREQUENCY (Hz)
VREF =2.5V
TEMPERATURE = 25°C
DIFFERENTIAL INPUT = –0.5dBFS
VCM = (AVDD1x + AVSSx) ÷ 2
INPUT FREQUENCY = 50Hz
16384 SAMPLES
16kSPS
GAIN = 1
GAIN = 2
GAIN = 4
GAIN = 8
Figure 26. FFT Plot at 16 kSPS, High Resolution Mode, Input Frequency (fIN) =
50 Hz, AVSSx (This Plot is a Close Up Perspective of the Original Data)
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–140
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
10
FREQUENCY (Hz)
VREF =2.5V
TEMPERATURE = 25°C
DIFFERENTIAL INPUT = –0.5dBFS
VCM = (AVDD1x + AVSSx) ÷ 2
INPUT FREQUENCY = 1kHz
16384 SAMPLES
16kSPS
GAIN = 1
GAIN = 2
GAIN = 4
GAIN = 8
Figure 27. FFT Plot, High Resolution Mode, Input Frequency (fIN) = 1 kHz,
AVSSx
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–130
–125
–120
–115
–110
–105
–100
INPUT FREQUENCY (Hz)
GAIN = 1
GAIN = 2
GAIN = 4
GAIN = 8
VIN = –0.5dBFS
VREF =2.5V
TEMPERATURE = 25°C
Figure 28. THD vs. Input Frequency at 8 kSPS, High Resolution Mode
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–170
–160
–150
–140
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
10
FREQUENCY (Hz)
VREF =2.5V
TEMPERATURE = 25°C
DIFFERENTIAL INPUT = –0.5dBFS
VCM = (AVDD1x + AVSSx) ÷ 2
INPUT FREQUENCY = 50Hz
8192 SAMPLES
4kSPS
GAIN = 1
GAIN = 2
GAIN = 4
GAIN = 8
Figure 29. FFT Plot, Low Power Mode, Input Frequency (fIN) = 50 Hz,
8192 Samples, AVSSx (This Plot is a Close Up Perspective of the Original Data)
–180
–170
–160
–150
–140
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
10
FREQUENCY (Hz)
VREF =2.5V
TEMPERATURE = 25°C
DIFFERENTIAL INPUT =
–0.5dBFS
INPUT FREQUENCY = 1kHz
8192 SAMPLES
4kSPS
GAIN = 1
GAIN = 2
GAIN = 4
GAIN = 8
VCM = (AVDD1x + AVSSx) ÷ 2
Figure 30. FFT Plot, Low Power Mode, Input Frequency (fIN) = 1 kHz,
8192 Samples, AVSSx
–135
–130
–125
–120
–115
–110
–105
–100
INPUT FREQUENCY (Hz)
GAIN = 1
GAIN = 2
GAIN = 4
GAIN = 8
VREF =2.5V
VIN = –0.5dBFS
TEMPERATURE = 25°C
Figure 31. THD vs. Input Frequency at 2 kSPS, Low Power Mode



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