Datasheet

REV. B–12–
AD7722–Typical Performance Characteristics
(AV
DD
= DV
DD
= 5.0 V, T
A
= 25C; CLKIN = 12.5 MHz, AIN = 20 kHz, Bipolar Mode; V
IN
(+) = 0 V to 2.5 V, V
IN
(–) = 1.25 V, unless otherwise noted.)
INPUT LEVEL (dB)
dB
110
100
50
–40 –30 0
–20 –10
90
80
70
60
SFDR
S/ (N+D)
TPC 1. S/(N+D) and SFDR vs.
Analog Input Level
INPUT FREQUENCY (kHz)
–85
–90
–115
020 10040 60 80
–95
–100
–105
–110
THD
SNR
SFDR
V
IN
(+) = V
IN
(–) = 1.25V p-p
V
CM
= 2.5V
dB
TPC 4. SNR, THD, and SFDR
vs. Input Frequency
TEMPERATURE (C)
–94
–116
–50 –25 100
0255075
–96
–108
–110
–112
–114
–100
–102
–106
–104
–98
THD
3RD
4TH
2ND
dB
TPC 7. THD vs. Temperature
OUTPUT DATA RATE (kSPS)
84
92
85
88
89
90
91
86
87
050 300
100 150 200 250
AIN = 1/ 5  BW
dB
TPC 2. S/(N+D) vs. Output
Sample Rate
OUTPUT DATA RATE (kSPS)
84
92
85
88
89
90
91
86
87
050 300
100 150 200 250
AIN = 1/ 5  BW
V
IN
(+) = V
IN
(–) = 1.25V p-p
V
CM
= 2.5V
dB
TPC 5. S/(N+D) vs. Output
Sample Rate
CODES
FREQUENCY OF OCCURRENCE
5000
0
n–3 n–2 n+3
n–1 n n+1 n+2
4500
2000
1500
1000
500
4000
3500
2500
3000
V
IN
(+) = V
IN
(–)
CLKIN = 12.5MHz
8k SAMPLES
TPC 8. Histogram of Output
Codes with DC Input
INPUT FREQUENCY (kHz)
dB
–85
–90
–115
020 100
40 60 80
–95
–100
–105
–110
SNR
SFDR
THD
TPC 3. SNR, THD, and SFDR
vs. Input Frequency
TEMPERATURE (C)
92.0
91.5
88.0
–50 0 100
50
90.0
89.5
88.5
89.0
91.0
90.5
dB
TPC 6. SNR vs. Temperature
CODE
DNL ERROR (LSB)
1.0
0.8
–1.0
0 20000 6553540000
–0.4
–0.8
–0.6
0
–0.2
0.6
0.2
0.4
TPC 9. Differential Nonlinearity