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AD7490BRUZ Datenblatt(PDF) 8 Page - Analog Devices

Teilenummer AD7490BRUZ
Bauteilbeschribung  16-Channel, 1 MSPS, 12-Bit ADC with Sequencer in 28-Lead TSSOP
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

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AD7490
Data Sheet
Rev. D | Page 8 of 28
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.
( )


×
=
s
Pf
Pf
PSRR
log
10
dB
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
–95
–75
–55
–35
–15
0
50
100
150
200
250
300
350
400
500
450
8192 POINT FFT
fSAMPLE = 1MSPS
fIN = 50kHZ
SINAD = 70.697dB
THD = –79.171dB
SFDR = –79.93dB
FREQUENCY (kHz)
Figure 5. Dynamic Performance at 1 MSPS
75
55
60
65
70
10
100
1000
INPUT FREQUENCY (kHz)
fS = MAX THROUGHPUT
TA = 25°C
RANGE = 0V TO REFIN
VDD = VDRIVE = 5.25V
VDD = VDRIVE = 4.75V
VDD = VDRIVE = 3.6V
VDD = VDRIVE = 2.7V
Figure 6. SINAD vs. Analog Input Frequency
for Various Supply Voltages at 1 MSPS
–20
–90
–80
–70
–60
–50
–40
–30
0
100k 200k 300k 400k 500k 600k 700k 800k 900k
1M
INPUT FREQUENCY (Hz)
VDD = 5V
VDD = 3V
VDD = 3V/5V, 10nF CAP
200mV p-p SINE WAVE ON VDD
REFIN = 2.5V, 1µF CAP
TA = 25°C
Figure 7. PSRR vs. Supply Ripple Frequency
–50
–90
–85
–80
–75
–70
–65
–60
–55
10
100
1000
INPUT FREQUENCY (kHz)
VDD = VDRIVE = 2.7V
VDD = VDRIVE = 3.6V
VDD = VDRIVE = 4.75V
VDD = VDRIVE = 5.25V
fS = MAX THROUGHPUT
TA = 25°C
RANGE = 0V TO REFIN
Figure 8. THD vs. Analog Input Frequency
for Various Supply Voltages at 1 MSPS


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