Datasheet

AD7904/AD7914/AD7924 Data Sheet
Rev. C | Page 12 of 32
TYPICAL PERFORMANCE CHARACTERISTICS
–10
–30
–50
–70
–90
–110
0
50
100 150
200
250 300
350 400
450
500
SNR (dB)
FREQUENCY (kHz)
4096 POINT FFT
AV
DD
= 5V
f
SAMPLE
= 1MSPS
f
IN
= 50kHz
SINAD = 71.147dB
THD = –87.229dB
SFDR = –90.744dB
03087-004
Figure 4. AD7924 Dynamic Performance at 1 MSPS
75
70
65
60
55
10 100
1000
SINAD (dB)
INPUT FREQUENCY (kHz)
AV
DD
= V
DRIVE
= 2.7V
AV
DD
= V
DRIVE
= 3.6V
AV
DD
= V
DRIVE
= 4.75V
AV
DD
= V
DRIVE
= 5.25V
f
SAMPLE
= 1MSPS
T
A
= 25°C
RANGE = 0V TO REF
IN
03087-005
Figure 5. AD7924 SINAD vs. Analog Input Frequency for Various Supply
Voltages at 1 MSPS, SCLK = 20 MHz
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
0 1000900800700600500400300
200100
PSRR (dB)
SUPPLY RIPPLE FREQUENCY (kHz)
AV
DD
= 5V
200mV p-p SINE WAVE ON AV
DD
REF
IN
= 2.5V, 1µF CAPACITOR
T
A
= 25°C
03087-006
Figure 6. AD7924 PSRR vs. Supply Ripple Frequency (No Decoupling)
–50
–55
–60
–65
–70
–75
–80
–85
–90
10 100 1000
THD (dB)
INPUT FREQUENCY (kHz)
AV
DD
= V
DRIVE
= 2.7V
AV
DD
= V
DRIVE
= 3.6V
AV
DD
= V
DRIVE
= 4.75V
AV
DD
= V
DRIVE
= 5.25V
f
SAMPLE
= 1MSPS
T
A
= 25°C
RANGE = 0V TO REF
IN
03087-007
Figure 7. AD7924 THD vs. Analog Input Frequency for Various Supply
Voltages at 1 MSPS
–50
–55
–60
–65
–70
–75
–80
–85
–90
10 100 1000
THD (dB)
INPUT FREQUENCY (kHz)
R
IN
= 1000Ω
R
IN
= 100Ω
R
IN
= 50Ω
R
IN
= 10Ω
f
SAMPLE
= 1MSPS
T
A
= 25°C
RANGE = 0V TO REF
IN
AV
DD
= 5.25V
03087-008
Figure 8. AD7924 THD vs. Analog Input Frequency for Various Source
Impedances
1.0
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
0 4096358430722560204815361024512
INL ERROR (LSB)
CODE
T
A
= 25°C
AV
DD
= V
DRIVE
= 5V
03087-009
Figure 9. AD7924 Typical INL