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AD7328
Rev. A | Page 11 of 36
8k
0
–3
CODE
7k
6k
5k
4k
3k
2k
1k
–2
–1
0
1
2
3
V
CC
= 5V
V
/V
= ±12V
RANGE = ±10V
10k SAMPLES
T
A
= 25°C
0
23
1201
7600
1165
11
0
0
Figure 16. Histogram of Codes, Single-Ended Mode
–50
–100
0
0
RIPPLE FREQUENCY (kHz)
C
–55
–60
–65
–70
–75
–80
–85
–90
–95
200
400
600
800
1000
1200
DIFFERENTIAL MODE
F
IN
= 50kHz
V
DD
/V
= ±12V
f
S
= 1MSPS
T
A
= 25°C
V
CC
= 5V
V
CC
= 3V
Figure 17. CMRR vs. Common-Mode Ripple Frequency
2.0
–2.0
±V
DD
/V
SS
SUPPLY VOLTAGE (V)
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
5
7
9
11
13
15
17
19
0
±5V RANGE
V
= V
= 5V
INTERNAL REFERENCE
SINGLE-ENDED MODE
DNL = 750kSPS
DNL = 750kSPS
DNL = 500kSPS
DNL = 500kSPS
DNL = 1MSPS
DNL = 1MSPS
Figure 18. DNL Error vs. Supply Voltage at 500 kSPS, 750 kSPS, and 1 MSPS
2.0
–2.0
±V
DD
/V
SS
SUPPLY VOLTAGE (V)
I
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
5
7
9
11
13
15
17
19
0
±5V RANGE
V
= V
= 5V
INTERNAL REFERENCE
SINGLE-ENDED MODE
INL = 750kSPS
INL = 500kSPS
INL = 1MSPS
INL = 750kSPS
INL = 500kSPS
INL = 1MSPS
Figure 19. INL Error vs. Supply Voltage at 500 kSPS, 750 kSPS, and 1 MSPS
–50
–100
0
1200
0
SUPPLY RIPPLE FREQUENCY (kHz)
P
–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
= 1MSPS
V
CC
= 5V
V
CC
= 3V
V
DD
= 12V
V
SS
= –12V
Figure 20. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
10
1000
ANALOG INPUT FREQUENCY (kHz)
T
100
0
–50
–55
–60
–65
–70
–75
–80
–85
–90
–95
V
CC
= V
DRIVE
= 5V
V
DD
/V
T
= 25°C
INTERNAL REFERENCE
RANGE = ±10V AND ±2.5V
R
= 50
,
±2.5V RANGE
R
= 50
,
±10V RANGE
R
= 100
,
±2.5V RANGE
R
= 1000
,
±2.5V RANGE
R
= 2000
,
±2.5V RANGE
R
= 4700
,
±2.5V RANGE
R
IN
= 2000
, ±10V RANGE
R
IN
= 1000
, ±10V RANGE
R
IN
= 100
, ±10V RANGE
Figure 21. THD vs. Analog Input Frequency for Various Source Impedances,
True Differential Mode
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