Datasheet
AD7321 Data Sheet
Rev. B | Page 10 of 36
TYPICAL PERFORMANCE CHARACTERISTICS
0
–14
0
0
F
R
E
Q
U
E
N
C
Y
(
k
H
z)
SNR (dB)
–20
–40
–60
–8
0
–100
–120
5
0
10
0 150 200 250
4096 POINT FF
T
V
C
C
=
V
DR
IV
E
=
5
V
V
D
D
,
V
S
S
=
±
15
V
T
A
=
25
°
C
I
N
T/
EXT
2
.5
V R
E
F
E
R
E
NC
E
±
10
V
RAN
G
E
F
I
N
=
50k
Hz
SNR
= 77.30dB
SINAD = 76.85dB
THD = –86.
96d
B
S
F
DR
=
–88
.
22
d
B
05399-004
Figure 4. FFT True Differential Mode
0
–140
0
F
RE
QU
ENCY (kHz)
SNR (dB)
–2
0
–4
0
–6
0
–80
–100
–12
0
5
0 10
0 150 20
0 25
0
4096 P
OIN
T
FFT
V
C
C
=
V
DR
IV
E
=
5V
V
D
D
,
V
S
S
=
±15
V
T
A
=
25°
C
I
NT
/
EXT
2.
5
V
R
E
F
ER
E
NCE
±10V
RANG
E
F
IN
=
50kHz
SNR = 74.67dB
SINAD = 74.03dB
THD = –82.68dB
SFDR = –85.40dB
05399-005
Figure 5. FFT Single-Ended Mode
1.0
–1.0
0
8192
CODE
DNL ERROR (LSB)
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
1024 2048 3072 4096 5120 6144 7168
512 1536 2560 3584 4608 5632 6656 7680
V
CC
= V
DRIVE
= 5V
T
A
= 25°C
V
DD
, V
SS
= ±15V
INT/EXT 2.5V REFERENCE
±10V RANGE
+DNL = +0.72LSB
–DNL = –0.22LSB
05399-006
Figure 6. Typical DNL True Differential Mode
1.
0
–1.
0
0
8192
C
OD
E
INL ERROR (LSB)
0
.8
0.6
0.4
0
.2
0
–0.2
–0.4
–0.6
–0.
8
1024
204
8 307
2 409
6
5120 6144 7168
512
1536 2560 3584 4608 5632
6656
768
0
V
CC
= V
DR
I
VE
= 5
V
T
A
= 25°C
V
D
D
, V
S
S
= ±
15V
INT
/
EXT
2.
5
V R
EF
E
RE
NC
E
±10V RAN
GE
+INL = +0.55LSB
–INL = –0
.
68L
SB
05399-007
Figure 7. Typical INL True Differential Mode
1
.0
–1.0
0
8192
C
ODE
DNL ERROR (LSB)
0.8
0.6
0.4
0.
2
0
–0.2
–0.4
–0.6
–0.8
1024 2048 3072 4096 5120 6144 7168
512 1536 2560 3584 4608 5632
6656 7680
V
CC
= V
DRIV
E
= 5V
T
A
= 25
°C
V
DD
, V
SS
= ±15V
INT/EXT 2.5V REFERENCE
±10V RANGE
+DNL = +0.79LSB
–DNL = –0.38LSB
05399-043
Figure 8. Typical DNL Single-Ended Mode
1.0
–1.0
0
8192
CODE
INL ERROR (LSB)
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
1024 2048 3072 4096 5120 6144 7168
512 1536 2560 3584 4608 5632 6656 7680
V
CC
= V
DRIVE
= 5V
T
A
= 25°C
V
DD
, V
SS
= ±15V
INT/EXT 2.5V REFERENCE
±10V RANGE
+INL = +0.87LSB
–INL = –0.49LSB
05399-044
Figure 9. Typical INL Single-Ended Mode