AD7322 Analog Devices, AD7322 Datasheet - Page 11

• Manufacturer Part Number: AD7322
• Description: Software Selectable True Bipolar Input, 2-Channel, 12-Bit Plus Sign ADC
• Manufacturer: Analog Devices

Specifications of AD7322

• Resolution (bits): 13bit
• # Chan: 2
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni,SE-Uni
• Ain Range: Bip (Vref),Bip (Vref) x 2,Bip (Vref) x 4,Bip 10V,Bip 2.5V,Bip 5.0V,Uni (Vref) x 4,Uni 10V
• Adc Architecture: SAR
• Pkg Type: SOP

Figure 18. DNL Error vs. Supply Voltage at 500 kSPS, 750 kSPS, and 1 MSPS
–100
–0.5
–1.0
–1.5
–2.0
–50
–55
–60
–65
–70
–75
–80
–85
–90
–95
2.0
1.5
1.0
0.5
8k
7k
6k
5k
4k
3k
2k
1k
0
0
0
5
Figure 17. CMRR vs. Common-Mode Ripple Frequency
±5V RANGE
V
INTERNAL REFERENCE
SINGLE-ENDED MODE
Figure 16. Histogram of Codes, Single-Ended Mode
V
CC
–3
CC
0
= V
= 5V
V
200
7
CC
DRIVE
= 3V
–2
23
= 5V
±V
9
RIPPLE FREQUENCY (kHz)
DD
400
/V
1201
–1
SS
DNL = 750kSPS
DNL = 1MSPS
SUPPLY VOLTAGE (V)
11
CODE
600
7600
0
13
DIFFERENTIAL MODE
f
V
f
T
DNL = 750kSPS
IN
S
A
DD
1165
= 1MSPS
= 50kHz
= 25°C
800
1
/V
SS
15
V
V
RANGE = ±10V
10k SAMPLES
T
A
CC
DD
= ±12V
DNL = 500kSPS
DNL = 500kSPS
DNL = 1MSPS
= 25°C
/V
= 5V
11
2
SS
1000
17
= ±12V
0
3
1200
19
Rev. A | Page 11 of 36
Figure 21. THD vs. Analog Input Frequency for Various Source Impedances,
Figure 19. INL Error vs. Supply Voltage at 500 kSPS, 750 kSPS, and 1 MSPS
Figure 20. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
–100
–0.5
–1.0
–1.5
–2.0
–50
–55
–60
–65
–70
–75
–80
–85
–90
–95
–50
–55
–60
–65
–70
–75
–80
–85
–90
–95
2.0
1.5
1.0
0.5
0
10
0
5
V
V
T
INTERNAL REFERENCE
RANGE = ±10V AND ±2.5V
R
100mV p-p SINE WAVE ON EACH SUPPLY
NO DECOUPLING
SINGLE-ENDED MODE
f
A
S
CC
DD
IN
= 1MSPS
= 25°C
= 1000Ω, ±10V RANGE
/V
R
= V
IN
SS
200
= 2000Ω, ±10V RANGE
7
DRIVE
= ±12V
SUPPLY RIPPLE FREQUENCY (kHz)
ANALOG INPUT FREQUENCY (kHz)
= 5V
INL = 1MSPS
±V
True Differential Mode
9
DD
400
/V
SS
SUPPLY VOLTAGE (V)
11
INL = 500kSPS
INL = 500kSPS
600
100
R
IN
13
= 100Ω, ±10V RANGE
V
V
±5V RANGE
V
INTERNAL REFERENCE
SINGLE-ENDED MODE
CC
CC
DD
V
800
SS
= 3V
= 12V
= V
15
= –12V
R
±10V RANGE
R
±2.5V RANGE
R
±2.5V RANGE
R
±2.5V RANGE
R
±2.5V RANGE
R
±2.5V RANGE
DRIVE
INL = 750kSPS
INL = 750kSPS
IN
IN
IN
IN
IN
IN
INL = 1MSPS
V
1000
= 50Ω,
= 4700Ω,
= 2000Ω,
= 1000Ω,
= 100Ω,
= 50Ω,
CC
= 5V
17
= 5V
AD7322
1200
1000
19