Datasheet

AD7321 Data Sheet
Rev. B | Page 12 of 36
8k
0
–3
CODE
NUMBER OF OCCURENCES
7k
6k
5k
4k
3k
2k
1k
–2 –1 0 1 2 3
V
CC
=5V
V
DD
/V
SS
=±12V
RANGE = ±10V
10k SAMPLES
T
A
= 25°C
023
1201
7600
1165
11 0
05399-014
Figure 16. Histogram of Codes, Single-Ended Mode
–
50
–100
0
RIPPLE FREQUENCY (kHz)
CMRR (dB)
–55
–60
–65
–70
–75
–80
–85
–90
–95
200 400 600 800 1000 1200
DIFFERENTIAL MODE
F
IN
= 50kHz
V
DD
/V
SS
= ±12V
f
S
= 500kSPS
T
A
=25°C
V
CC
=5V
V
CC
=3V
0
5399-055
Figure 17. CMRR vs. Common-Mode Ripple Frequency
2.0
–2.0
±V
DD
/V
SS
SUPPLY VOLTAGE (V)
DNL ERROR (LSB)
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
5 7 9 11 13 15 17 19
±5V RANGE
V
CC
=V
DRIVE
=5V
INTERNAL REFERENCE
SINGLE-ENDED MODE
DNL = 500kSPS
05399-049
Figure 18. DNL Error vs. Supply Voltage at 500 kSPS
2.0
–2.0
±V
DD
/V
SS
SUPPLY VOLTAGE (V)
INL ERROR (LSB)
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
5 7 9 11 13 15 17 19
±5V RANGE
V
CC
=V
DRIVE
=5V
INTERNAL REFERENCE
SINGLE-ENDED MODE
INL = 500kSPS
05399-050
Figure 19. INL Error vs. Supply Voltage at 500 kSPS
–
50
–100
0 1200
SUPPLY RIPPLE FREQUENCY (kHz)
PSRR (dB)
–55
–60
–65
–70
–75
–80
–85
–90
–95
200 400 600 800 1000
100mV p-p SINE WAVE ON EACH SUPPLY
NO DECOUPLING
SINGLE-ENDED MODE
f
S
= 500kSPS
V
CC
=5V
V
CC
=3V
V
DD
=12V
V
SS
=–12V
05399-054
Figure 20. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
–
50
–100
10
1000
INPUT FREQUENCY (kHz)
THD (dB)
100
–55
–60
–65
–70
–75
–80
–85
–90
–95
V
CC
=V
DRIVE
=5V
V
DD
/V
SS
=±12V
T
A
= 25°C
INTERNAL REF
RANGE = ±10V AND ±2.5V
f
S
= 500kSPS
DIFFERENTIAL MODE
±10V RANGE
R
IN
= 4000Ω
R
IN
= 3000Ω
R
IN
= 2000Ω
R
IN
= 1000Ω
R
IN
= 100Ω
R
IN
=12Ω
±2.5V RANGE
R
IN
= 9000Ω
R
IN
= 5500Ω
R
IN
= 2000Ω
R
IN
=100Ω
R
IN
=12Ω
05399-064
Figure 21. THD vs. Analog Input Frequency for Various Source Impedances,
True Differential Mode
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