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AD7921AUJ-R2 数据表(PDF) 13 Page - Analog Devices

部件名 AD7921AUJ-R2
功能描述  2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs
PDF  28 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7921AUJ-R2 数据表(HTML) 13 Page - Analog Devices

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AD7911/AD7921
Rev. 0 | Page 13 of 28
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 10 and Figure 11 show typical FFT plots for the AD7921
and AD7911, respectively, at a 250 kSPS sample rate and
100 kHz input frequency.
Figure 12 shows the SINAD ratio performance versus the input
frequency for various supply voltages while sampling at
250 kSPS with a SCLK frequency of 5 MHz for the AD7921.
Figure 13 shows the SNR ratio performance versus the input
frequency for various supply voltages while sampling at
250 kSPS with an SCLK frequency of 5 MHz for the AD7921.
Figure 14 and Figure 15 show INL and DNL performance for
the AD7921.
Figure 16 shows a graph of the total harmonic distortion versus
the analog input frequency for different source impedances
when using a supply voltage of 3.6 V and a sampling rate of
250 kSPS. See the Analog Input section.
Figure 17 shows a graph of the total harmonic distortion versus
the analog input frequency for various supply voltages while
sampling at 250 kSPS with an SCLK frequency of 5 MHz.
Figure 18 shows the shutdown current versus the voltage supply
for different operating temperatures.
5
–115
–95
–75
–55
–35
–15
0
20
40
60
80
100
120
FREQUENCY (kHz)
8192 POINT FFT
VDD = 2.7V
FSAMP = 250kSPS
FIN = 100kHz
SNR = 73.13dB
SINAD = 72.73dB
THD = –83.30dB
SFDR = –86.15dB
Figure 10. AD7921 Dynamic Performance at 250 kSPS
8192 POINT FFT
VDD = 2.7V
FSAMP = 250kSPS
FIN = 100kHz
SNR = 73.13dB
SINAD = 72.73dB
THD = –83.30dB
SFDR = –86.15dB
5
–115
–95
–75
–55
–35
–15
0
20
40
60
80
100
120
FREQUENCY (kHz)
8192 POINT FFT
VDD = 2.7V
FSAMP = 250kSPS
FIN = 100kHz
SNR = 61.75dB
SINAD = 61.74dB
THD = –86.24dB
SFDR = –84.46dB
Figure 11. AD7911 Dynamic Performance at 250 kSPS
–70.5
–74.0
–73.5
–73.0
–72.5
–72.0
–71.5
–71.0
10
100
1k
FREQUENCY (kHz)
VDD = 3.6V
VDD = 5.25V
VDD = 4.75V
VDD = 2.35V
VDD = 2.7V
Figure 12. AD7921 SINAD vs. Input Frequency at 250 kSPS
–72.0
–73.6
–73.4
–73.2
–73.0
–72.8
–72.4
–72.2
–72.6
10
100
1k
FREQUENCY (kHz)
VDD = 2.35V
VDD = 3.6V
VDD = 5.25V
VDD = 4.75V
VDD = 2.7V
Figure 13. AD7921 SNR vs. Input Frequency at 250 kSPS



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