AD7490 データシートの表示（PDF） - Analog Devices
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AD7490 Datasheet PDF : 29 Pages
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AD7490
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 5 shows a typical FFT plot for the AD7490 at 1 MSPS sample rate and 50 kHz input frequency.
Figure 7 shows the power supply rejection ratio vs. supply ripple frequency for the AD7490. The power supply rejection ratio is defined as
the ratio of the power in the ADC output at full-scale frequency f, to the power of a 200 mV p-p sine wave applied to the ADC VDD supply
of frequency fS.
PSRR(dB) = 10 × log
Pf
Pf s
where:
Pf is equal to the power at frequency f in ADC output.
PfS is equal to power at frequency fS coupled onto the ADC VDD supply input.
Here, a 200 mV p-p sine wave is coupled onto the VDD supply. 10 nF decoupling was used on the supply, and a 1 µF decoupling capacitor
was used on the REFIN pin.
5
–20
8192 POINT FFT
VDD = 3V/5V, 10nF CAP
fSAMPLE = 1MSPS
200mV p-p SINE WAVE ON VDD
–15
fIN = 50kHZ
–30 REFIN = 2.5V, 1µF CAP
SINAD = 70.697dB
TA = 25°C
THD = –79.171dB
SFDR = –79.93dB
–40
–35
–50
–55
–60
–75
–95
0 50 100 150 200 250 300 350 400 450 500
FREQUENCY (kHz)
Figure 5. Dynamic Performance at 1 MSPS
–70
VDD = 5V
–80
–90
0
VDD = 3V
100k 200k 300k 400k 500k 600k 700k 800k 900k 1M
INPUT FREQUENCY (Hz)
Figure 7. PSRR vs. Supply Ripple Frequency
75
VDD = VDRIVE = 5.25V
VDD = VDRIVE = 4.75V
70
VDD = VDRIVE = 3.6V
65
60
fS = MAX THROUGHPUT
TA = 25°C
RANGE = 0V TO REFIN
55
10
100
VDD = VDRIVE = 2.7V
1000
INPUT FREQUENCY (kHz)
Figure 6. SINAD vs. Analog Input Frequency
for Various Supply Voltages at 1 MSPS
–50
fS = MAX THROUGHPUT
–55 TA = 25°C
RANGE = 0V TO REFIN
–60
VDD = VDRIVE = 2.7V
–65
–70
VDD = VDRIVE = 3.6V
–75
–80
VDD = VDRIVE = 4.75V
–85
VDD = VDRIVE = 5.25V
–90
10
100
INPUT FREQUENCY (kHz)
1000
Figure 8. THD vs. Analog Input Frequency
for Various Supply Voltages at 1 MSPS
Rev. D | Page 8 of 28
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