REV. B
AD7724
–8–
(AVDD = DVDD = 5.0 V, TA = 25 C; CLKIN = 13 MHz ac-coupled sine wave, AIN = 20 kHz, Bipolar Mode; VIN(+) = 0 V to 2.5 V, VIN(–) = 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
dB
–85
–90
–115
0
20
100
40
60
80
–95
–100
–105
–110
THD
SNR
SFDR
VIN (+) = VIN(–) = 1.25V p-p
VCM = 2.5V
TPC 4. SNR, THD, and SFDR vs.
Input Frequency
TEMPERATURE – °C
dB
–94
–116
–50
–25
100
025
50
75
–96
–108
–110
–112
–114
–100
–102
–106
–104
–98
THD
3RD
4TH
2ND
TPC 7. THD vs. Temperature
–Typical Performance Characteristics
OUTPUT DATA RATE – kSPS
dB
84
92
85
88
89
90
91
86
87
0
50
300
100
150
200
250
AIN = 1/5
BW
TPC 2. S/(N+D) vs. Output Sample
Rate
OUTPUT DATA RATE – kSPS
dB
84
92
85
88
89
90
91
86
87
0
50
300
100
150
200
250
AIN = 1/5
BW
VIN (+) = VIN(–) = 1.25V p-p
VCM = 2.5V
TPC 5. S/(N+D) vs. Output Sample
Rate
CODES
FREQUENCY
OF
OCCURENCE
5000
0
n–3n–2
n+3
n–1
n
n+1
n+2
4500
2000
1500
1000
500
4000
3500
2500
3000
VIN(+) = VIN(–)
CLKIN = 13MHz
8k SAMPLES
TPC 8. Histogram of Output Codes
with DC Input
INPUT FREQUENCY – kHz
dB
–85
–90
–115
0
20
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
65535
40000
–0.4
–0.8
–0.6
0
–0.2
0.6
0.2
0.4
TPC 9. Differential Nonlinearity