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AD7321 数据表(PDF) 13 Page - Analog Devices

部件名 AD7321
功能描述  2-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
PDF  37 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7321 数据表(HTML) 13 Page - Analog Devices

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AD7321
Data Sheet
Rev. B | Page 12 of 36
8k
0
–3
CODE
7k
6k
5k
4k
3k
2k
1k
–2
–1
0
1
2
3
VCC =5V
VDD/VSS =±12V
RANGE = ±10V
10k SAMPLES
TA = 25°C
023
1201
7600
1165
11
0
Figure 16. Histogram of Codes, Single-Ended Mode
–50
–100
0
RIPPLE FREQUENCY (kHz)
–55
–60
–65
–70
–75
–80
–85
–90
–95
200
400
600
800
1000
1200
DIFFERENTIAL MODE
FIN = 50kHz
VDD/VSS = ±12V
fS = 500kSPS
TA =25°C
VCC =5V
VCC =3V
Figure 17. CMRR vs. Common-Mode Ripple Frequency
2.0
–2.0
±VDD/VSS SUPPLY VOLTAGE (V)
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
5
7
9
11
13
15
17
19
±5V RANGE
VCC =VDRIVE =5V
INTERNAL REFERENCE
SINGLE-ENDED MODE
DNL = 500kSPS
Figure 18. DNL Error vs. Supply Voltage at 500 kSPS
2.0
–2.0
±VDD/VSS SUPPLY VOLTAGE (V)
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
5
7
9
11
13
15
17
19
±5V RANGE
VCC =VDRIVE =5V
INTERNAL REFERENCE
SINGLE-ENDED MODE
INL = 500kSPS
Figure 19. INL Error vs. Supply Voltage at 500 kSPS
–50
–100
0
1200
SUPPLY RIPPLE FREQUENCY (kHz)
–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
fS = 500kSPS
VCC =5V
VCC =3V
VDD =12V
VSS =–12V
Figure 20. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
–50
–100
10
1000
INPUT FREQUENCY (kHz)
100
–55
–60
–65
–70
–75
–80
–85
–90
–95
VCC =VDRIVE =5V
VDD/VSS =±12V
TA = 25°C
INTERNAL REF
RANGE = ±10V AND ±2.5V
fS = 500kSPS
DIFFERENTIAL MODE
±10V RANGE
RIN = 4000Ω
RIN = 3000Ω
RIN = 2000Ω
RIN = 1000Ω
RIN = 100Ω
RIN =12Ω
±2.5V RANGE
RIN = 9000Ω
RIN = 5500Ω
RIN = 2000Ω
RIN =100Ω
RIN =12Ω
Figure 21. THD vs. Analog Input Frequency for Various Source Impedances,
True Differential Mode



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