AD7321 Analog Devices, AD7321 Datasheet - Page 11

• Manufacturer Part Number: AD7321
• Description: 500 kSPS, 2-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
• Manufacturer: Analog Devices

Specifications of AD7321

• Resolution (bits): 13bit
• # Chan: 2
• Sample Rate: 500kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: Bip 10V,Bip 2.5V,Bip 5.0V,Uni 10V
• Adc Architecture: SAR
• Pkg Type: SOP

Figure 12. SINAD vs. Analog Input Frequency for Single-Ended (SE) and True
Figure 10. THD vs. Analog Input Frequency for Single-Ended (SE) and True
Figure 11. THD vs. Analog Input Frequency for Single-Ended (SE) and True
–100
–100
–50
–55
–60
–65
–70
–75
–80
–85
–90
–95
–50
–55
–60
–65
–70
–75
–80
–85
–90
–95
80
75
70
65
60
55
50
10
10
10
V
V
T
f
INTERNAL REFERENCE
V
V
T
f
INTERNAL REFERENCE
S
S
CC
DD
A
A
CC
DD
= 500kSPS
= 500kSPS
= 25°C
= 25°C
/V
/V
= V
= V
SS
SS
DRIVE
DRIVE
= ±12V
= ±12V
Differential Mode (Diff) at 3 V V
Differential Mode (Diff) at 5 V V
Differential Mode (Diff) at 3 V V
ANALOG INPUT FREQUENCY (kHz)
ANALOG INPUT FREQUENCY (kHz)
ANALOG INPUT FREQUENCY (kHz)
= 3V
= 5V
0V TO +10V SE
100
100
100
±2.5V DIFF
±5V SE
±5V DIFF
0V TO +10V SE
V
V
T
f
INTERNAL REFERENCE
S
0V TO +10V SE
A
CC
DD
= 500kSPS
= 25°C
/V
= V
0V TO +10V DIFF
±10V SE
SS
±2.5V SE
±2.5V DIFF
±5V SE
DRIVE
±10V SE
0V TO +10V DIFF
±2.5V SE
0V TO +10V DIFF
= ±12V
CC
CC
CC
±10V SE
±5V DIFF
±5V SE
±5V DIFF
±2.5V SE
±10V DIFF
±10V DIFF
±10V DIFF
±2.5V DIFF
= 3V
1000
1000
1000
Rev. A | Page 11 of 36
Figure 13. SINAD vs. Analog Input Frequency for Single-Ended (SE) and True
–50
–55
–60
–65
–70
–75
–80
–85
–90
–95
10k
80
75
70
65
60
55
50
9k
8k
7k
6k
5k
4k
3k
2k
1k
10
0
0
Figure 15. Histogram of Codes, True Differential Mode
–2
0
Figure 14. Channel-to-Channel Isolation
100
Differential Mode (Diff) at 5 V V
FREQUENCY OF INPUT NOISE (kHz)
ANALOG INPUT FREQUENCY (kHz)
228
–1
200
V
CC
V
SINGLE-ENDED MODE
f
T
50kHz ON SELECTED CHANNEL
±10V SE
S
±5V DIFF
DD
A
= 3V
= 500kSPS
CODE
100
300
9469
= 25°C
/V
0
SS
= ±12V
V
V
T
f
INTERNAL REFERENCE
±2.5V DIFF
S
0V TO +10V SE
A
CC
DD
= 500kSPS
= 25°C
/V
V
400
= V
CC
SS
303
V
V
RANGE = ±10V
10k SAMPLES
T
DRIVE
1
= 5V
A
= ±12V
CC
DD
0V TO +10V DIFF
CC
= 25°C
/V
±5V SE
±2.5V SE
= 5V
SS
±10V DIFF
= 5V
500
= ±12V
AD7321
0
2
1000
600