Datasheet

AD7993/AD7994
Rev. 0 | Page 12 of 32
TYPICAL PERFORMANCE CHARACTERISTICS
–120
–100
–80
–60
–40
–20
0
SINAD (dB)
20 40060
FREQUENCY (kHz)
03473-0-004
FS = 121kSPS
FSCL = 3.4MHz
FIN = 10kHz
SNR = 71.84dB
SINAD = 71.68dB
THD = 86.18dB
SFDR = –88.70dB
Figure 4. AD7994 Dynamic Performance with 5 V Supply and
2.5 V Reference, 121 kSPS, Mode 1
–110
–90
–70
–50
–30
–10
SINAD (dB)
10 40060
40
45
50
60
70
75
SINAD (dB)
1 1000
FREQUENCY(kHz)
03473-0-007
10010
V
DD
= 5.5V
V
DD
= 4.5V
V
DD
= 3V
V
DD
= 2.7V
V
DD
= 3.3V
V
DD
= 5V
65
55
FREQUENCY (kHz)
03473-0-005
20 30 50
FS = 121kSPS
FSCL = 3.4MHz
FIN = 10kHz
SINAD = 61.63dB
THD = 91.82dB
SFDR = –94.95dB
Figure 5. AD7993 Dynamic Performance with 5 V Supply and
2.5 V Reference, 121 kSPS, Mode 1
20
40
70
80
90
100
PSRR (dB)
10 1000
SUPPLY RIPPLE FREQUENCY(kHz)
03473-0-006
100
V
DD
= 3V
V
DD
= 5V
50
30
60
V
DD
= 3V/5V
 200mV p-p SINE WAVE
ON V
DD
2nF CAPACITOR ON V
DD
Figure 6. PSRR vs. Supply Ripple Frequency
Figure 7. AD7994 SINAD vs. Analog Input Frequency for
Various Supply Voltages, 3.4 MHz f
SCL
, 136 kSPS
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
1.0
INL ERROR (LSB)
20001500500 10000 2500 3000 3500 4000
CODE
03473-0-008
Figure 8. AD7994 Typical INL, V
DD
= 5.5 V, Mode 1, 3.4 MHz f
SCL
, 121 kSPS
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
1.0
DNL ERROR (LSB)
20001500500 10000 2500 3000 3500 4000
CODE
03473-0-009
Figure 9. AD7994 Typical DNL, V
DD
= 5.5 V, Mode 1, 3.4 MHz f
SCL
, 121 kSPS