AD7904/AD7914/AD7924
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
–50
–55
–60
–65
–70
–75
–80
–85
–90
4096 POINT FFT
AV = 5V
fSAMPLE = 1MSPS
fIN = 50kHz
SINAD = 71.147dB
THD = –87.229dB
SFDR = –90.744dB
–10
fSAMPLE = 1MSPS
= 25°C
RANGE = 0V TO REF
DD
T
A
AV
= V
DRIVE
= 2.7V
DD
IN
–30
–50
AV
= V = 3.6V
DRIVE
DD
–70
–90
AV
= V = 4.75V
DRIVE
DD
AV
= V
= 5.25V
DD
DRIVE
–110
0
50
100 150 200 250 300 350 400 450 500
FREQUENCY (kHz)
10
100
INPUT FREQUENCY (kHz)
1000
Figure 4. AD7924 Dynamic Performance at 1 MSPS
Figure 7. AD7924 THD vs. Analog Input Frequency for Various Supply
Voltages at 1 MSPS
75
70
65
60
55
–50
fSAMPLE = 1MSPS
A
RANGE = 0V TO REF
AV
AV
= V
= V
= 5.25V
= 4.75V
T
= 25°C
DD
DD
DRIVE
–55
–60
–65
–70
–75
–80
–85
–90
IN
DRIVE
AV
= 5.25V
DD
R
= 1000Ω
IN
AV
= V = 3.6V
DRIVE
DD
R
= 100Ω
IN
R
= 50Ω
= 10Ω
IN
R
IN
fSAMPLE = 1MSPS
= 25°C
RANGE = 0V TO REF
AV
= V = 2.7V
DRIVE
T
DD
A
IN
10
100
INPUT FREQUENCY (kHz)
1000
10
100
INPUT FREQUENCY (kHz)
1000
Figure 5. AD7924 SINAD vs. Analog Input Frequency for Various Supply
Voltages at 1 MSPS, SCLK = 20 MHz
Figure 8. AD7924 THD vs. Analog Input Frequency for Various Source
Impedances
0
1.0
AV
= 5V
T
AV
= 25°C
= V
DD
A
200mV p-p SINE WAVE ON AV
= 5V
DRIVE
0.8
0.6
DD
REF = 2.5V, 1µF CAPACITOR
DD
–10
–20
–30
–40
–50
–60
–70
–80
–90
IN
T
= 25°C
A
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
100 200 300 400 500 600 700 800 900 1000
SUPPLY RIPPLE FREQUENCY (kHz)
0
512
1024
1536
2048
2560
3072
3584
4096
CODE
Figure 6. AD7924 PSRR vs. Supply Ripple Frequency (No Decoupling)
Figure 9. AD7924 Typical INL
Rev. C | Page 12 of 32
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