AD7908(RevA) データシートの表示（PDF） - Analog Devices
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AD7908
(Rev.:RevA)
(Rev.:RevA)
Analog Devices
AD7908 Datasheet PDF : 24 Pages
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AD7908/AD7918/AD7928–Typical Performance Characteristics
PERFORMANCE CURVES
TPC 1 shows a typical FFT plot for the AD7928 at 1 MSPS
sample rate and 50 kHz input frequency. TPC 2 shows the
signal-to-(noise + distortion) ratio performance versus input
frequency for various supply voltages while sampling at 1 MSPS
with an SCLK of 20 MHz.
TPC 3 shows the power supply rejection ratio versus supply
ripple frequency for the AD7928 when no decoupling is used.
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 AVDD 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 the power at frequency fS coupled onto the ADC AVDD
supply. Here a 200 mV p-p sine wave is coupled onto the AVDD
supply.
–10
4096 POINT FFT
AVDD = 5V
fSAMPLE = 1MSPS
–30
fIN = 50kHz
SINAD = 71.147dB
THD = –87.229dB
SFDR = –90.744dB
–50
–70
–90
–110
0
50 100 150 200 250 300 350 400 450 500
FREQUENCY (kHz)
TPC 1. AD7928 Dynamic Performance at 1 MSPS
75
AVDD = V DRIVE = 5.25V
AVDD = V DRIVE = 4.75V
70
AVDD = V DRIVE = 3.6V
65
60
fSAMPLE = 1MSPS
TA = 25؇C
RANGE = 0 TO REFIN
AVDD = V DRIVE = 2.7V
55
10
100
1000
INPUT FREQUENCY (kHz)
TPC 2. AD7928 SINAD vs. Analog Input Frequency for
Various Supply Voltages at 1 MSPS
TPC 4 shows a graph of total harmonic distortion versus analog
input frequency for various supply voltages, while TPC 5 shows
a graph of total harmonic distortion versus analog input frequency
for various source impedances. See the Analog Input section.
TPC 6 and TPC 7 show typical INL and DNL plots for the
AD7928.
0
AVDD = 5V
–10 200mV p-p SINE WAVE ON AVDD
REFIN = 2.5V, 1F CAPACITOR
–20 TA = 25؇C
–30
–40
–50
–60
–70
–80
–90
0
100 200 300 400 500 600 700 800 900 1000
SUPPLY RIPPLE FREQUENCY (kHz)
TPC 3. AD7928 PSRR vs. Supply Ripple Frequency
–50
fSAMPLE = 1MSPS
–55 TA = 25؇C
RANGE = 0 TO REFIN
–60
AVDD = V DRIVE = 2.7V
–65
AVDD = V DRIVE = 3.6V
–70
–75
–80
–85
–90
10
AVDD = V DRIVE = 4.75V
AVDD = V DRIVE = 5.25V
100
INPUT FREQUENCY (kHz)
1000
TPC 4. AD7928 THD vs. Analog Input Frequency for
Various Supply Voltages at 1 MSPS
–50
fSAMPLE = 1MSPS
–55 TA = 25؇C
RANGE = 0 TO REFIN
–60 AVDD = 5.25V
–65
RIN = 1000⍀
–70
RIN = 100⍀
RIN = 50⍀
–75
–80
RIN = 10⍀
–85
–90
10
100
INPUT FREQUENCY (kHz)
1000
TPC 5. AD7928 THD vs. Analog Input Frequency for
Various Source Impedances
–12–
REV. A
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