AD7490BCP(RevA) データシートの表示（PDF） - Analog Devices
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AD7490BCP Datasheet PDF : 24 Pages
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AD7490–Typical Performance Characteristics
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)
=
10
×
log
Pf
PfS
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.
–20
VDD ؍3V/5V, 10nF CAP
200mV p-p SINE WAVE ON V DD
–30 REFIN ؍2.5V, 1F CAP
TA ؍25 C
–40
–50
–60
–70
VDD ؍5V
–80
–90
0
VDD ؍3V
100k 200k 300k 400k 500k 600k 700k 800k 900k 1M
INPUT FREQUENCY – Hz
TPC 3. PSRR vs. Supply Ripple Frequency
5
8192 POINT FFT
fSAMPLE ؍1MSPS
–15
fIN ؍50kHz
SINAD ؍70.697dB
THD ؍–79.171dB
SFDR ؍–79.93dB
–35
–55
–75
–95
–115
0
50 100 150 200 250 300 350 400 450 500
FREQUENCY – kHz
TPC 1. Dynamic Performance at 1 MSPS
–50
fS ؍MAX THROUGHPUT
–55 TA ؍25 C
RANGE ؍0 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
TPC 4. THD vs. Analog Input Frequency for Various
Supply Voltages at 1 MSPS
75
VDD ؍VDRIVE ؍5.25V
VDD ؍VDRIVE ؍4.75V
70
VDD ؍VDRIVE ؍3.6V
65
60
fS ؍MAX THROUGHPUT
TA ؍25 C
RANGE ؍0 TO REFIN
55
10
100
VDD ؍VDRIVE ؍2.7V
1000
INPUT FREQUENCY – kHz
TPC 2. SINAD vs. Analog Input Frequency for
Various Supply Voltages at 1 MSPS
–50
fS ؍1 MSPS
–55
TA ؍25 C
VDD ؍5.25 V
RANGE ؍0 TO REFIN
–60
RIN ؍1000
–65
–70
–75
–80
–85
10
RIN ؍100
RIN ؍50
RIRNIN؍؍101000
100
INPUT FREQUENCY – kHz
1000
TPC 5. THD vs. Analog Input Frequency for Various
Analog Source Impedances
–8–
REV. A
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