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AD7490BCP Datasheet(PDF) 8 Page - Analog Devices

No. de pieza AD7490BCP
Descripción Electrónicos  16-Channel, 1 MSPS, 12-Bit ADC with Sequencer in 28-Lead TSSOP
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD7490BCP Datasheet(HTML) 8 Page - Analog Devices

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–8–
AD7490–Typical Performance Characteristics
REV. A
TPC 1 shows a typical FFT plot for the AD7490 at 1 MSPS
sample rate and 50 kHz input frequency.
TPC 3 shows the power supply rejection ratio versus 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
Pf
Pf
S
()
log


10
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
cap on the REFIN pin.
INPUT FREQUENCY – Hz
–20
–90
01M
100k 200k 300k 400k 500k 600k 700k 800k 900k
–30
–40
–50
–60
–70
–80
VDD
5V
VDD
3V
VDD
3V/5V, 10nF CAP
200mV p-p SINE WAVE ON V DD
REFIN
2.5V, 1 F CAP
TA
25 C
TPC 3. PSRR vs. Supply Ripple Frequency
INPUT FREQUENCY – kHz
–50
–90
10
1000
100
–70
–60
–80
VDD
VDRIVE
4.75V
VDD
VDRIVE
5.25V
VDD
VDRIVE
2.7V
VDD
VDRIVE
3.6V
fS
MAX THROUGHPUT
TA
25 C
RANGE
0 TO REFIN
–55
–75
–65
–85
TPC 4. THD vs. Analog Input Frequency for Various
Supply Voltages at 1 MSPS
INPUT FREQUENCY – kHz
–50
10
1000
100
–70
–60
–80
RIN
100
fS
1 MSPS
TA
25 C
VDD
5.25 V
RANGE
0 TO REFIN
–55
–75
–65
–85
RIN
1000
RIN
10
RIN
50
RIN
1000
TPC 5. THD vs. Analog Input Frequency for Various
Analog Source Impedances
5
–55
–115
–15
–35
–75
–95
FREQUENCY – kHz
0
500
50
100
150
200
250
300
350
400
450
8192 POINT FFT
fSAMPLE
1MSPS
fIN
50kHz
SINAD
70.697dB
THD
–79.171dB
SFDR
–79.93dB
TPC 1. Dynamic Performance at 1 MSPS
INPUT FREQUENCY – kHz
75
55
10
1000
100
65
70
60
VDD
VDRIVE
5.25V
VDD
VDRIVE
4.75V
VDD
VDRIVE
2.7V
VDD
VDRIVE
3.6V
fS
MAX THROUGHPUT
TA
25 C
RANGE
0 TO REFIN
TPC 2. SINAD vs. Analog Input Frequency for
Various Supply Voltages at 1 MSPS


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