AD7904/AD7914/AD7924
TYPICAL PERFORMANCE CHARACTERISTICS
–10
4096 POINT FFT
AVDD = 5V
fSAMPLE = 1MSPS
fIN = 50kHz
–30
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)
Figure 4. AD7924 Dynamic Performance at 1 MSPS
75
AVDD = VDRIVE = 5.25V
AVDD = VDRIVE = 4.75V
70
AVDD = VDRIVE = 3.6V
65
60
fSAMPLE = 1MSPS
TA = 25°C
RANGE = 0V TO REFIN
55
10
AVDD = VDRIVE = 2.7V
100
1000
INPUT FREQUENCY (kHz)
Figure 5. AD7924 SINAD vs. Analog Input Frequency for Various Supply
Voltages at 1 MSPS, SCLK = 20 MHz
0
AVDD = 5V
–10 200mV p-p SINE WAVE ON AVDD
REFIN = 2.5V, 1µF 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)
Figure 6. AD7924 PSRR vs. Supply Ripple Frequency (No Decoupling)
Data Sheet
–50
fSAMPLE = 1MSPS
–55
TA = 25°C
RANGE = 0V TO REFIN
–60
AVDD = VDRIVE = 2.7V
–65
AVDD = VDRIVE = 3.6V
–70
–75
–80
–85
–90
10
AVDD = VDRIVE = 4.75V
AVDD = VDRIVE = 5.25V
100
INPUT FREQUENCY (kHz)
1000
Figure 7. AD7924 THD vs. Analog Input Frequency for Various Supply
Voltages at 1 MSPS
–50
fSAMPLE = 1MSPS
–55
TA = 25°C
RANGE = 0V TO REFIN
AVDD = 5.25V
–60
RIN = 1000Ω
–65
–70
RIN = 100Ω
RIN = 50Ω
–75
–80
RIN = 10Ω
–85
–90
10
100
INPUT FREQUENCY (kHz)
1000
Figure 8. AD7924 THD vs. Analog Input Frequency for Various Source
Impedances
1.0
TA = 25°C
0.8 AVDD = VDRIVE = 5V
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
Figure 9. AD7924 Typical INL
Rev. C | Page 12 of 32