AD7441/AD7451
Rev. D | Page 10 of 24
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, fS = 1 MSPS, fSCLK = 18 MHz, VDD = 2.7 V to 5.25 V, VREF = 2.5 V, unless otherwise noted.
75
55
60
65
70
10
100
1000
FREQUENCY (kHz)
S
INAD
(
d
B
)
VDD = 5.25V
VDD = 4.75V
VDD = 3.6V
VDD = 2.7V
03
15
3
-00
7
Figure 7. SINAD vs. Analog Input Frequency for the AD7451 for
Various Supply Voltages
0
–120
–80
–100
–60
–40
–20
0
100
200
300
400
500
600
700
800
900 1000
SUPPLY RIPPLE FREQUENCY (kHz)
P
S
RR
(
d
B)
100mV p-p SINE WAVE ON VDD
NO DECOUPLING ON VDD
VDD = 3V
VDD = 5V
03
15
3
-00
8
Figure 8. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
FREQUENCY (kHz)
S
N
R
(
d
B)
0
100
200
–100
–140
500
–20
0
–120
–40
–60
–80
8192 POINT FFT
fSAMPLE = 1MSPS
fIN = 100kSPS
SINAD = 71dB
THD = –82dB
SFDR = –83dB
300
400
0
315
3-
0
09
Figure 9. AD7451 Dynamic Performance for VDD = 5 V
D
NL
E
R
RO
R
(
L
S
B
)
CODE
0.4
0
1024
2048
3072
0.2
0
–0.2
–0.4
–1.0
4096
0.6
0.8
1.0
–0.6
–0.8
03
15
3-
0
10
Figure 10. Typical DNL for the AD7451 for VDD = 5 V
INL
E
RRO
R
(
L
S
B)
CODE
0.4
0
1024
2048
3072
0.2
0
–0.2
–0.4
–1.0
4096
0.6
0.8
1.0
–0.6
–0.8
03
15
3-
0
11
Figure 11. Typical INL for the AD7451 for VDD = 5 V
CO
UNT
S
CODES
0
2046
2047
2048
2049
2050
2051
27 CODES
24 CODES
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
9949
CODES
03
15
3-
0
12
Figure 12. Histogram of 10,000 Conversions of a DC Input for the AD7451