AD7922 Analog Devices, AD7922 Datasheet - Page 14

• Manufacturer Part Number: AD7922
• Description: 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 12-Bit A/D Converter
• Manufacturer: Analog Devices

Specifications of AD7922

• Resolution (bits): 12bit
• # Chan: 2
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni Vdd
• Adc Architecture: SAR
• Pkg Type: SOP,SOT

AD7912/AD7922
Figure 16. THD vs. Analog Input Frequency for Various Source Impedances
–0.2
–0.4
–0.6
–0.8
–1.0
–0.2
–0.4
–0.6
–0.8
–1.0
1.0
0.8
0.6
0.4
0.2
1.0
0.8
0.6
0.4
0.2
–20
–30
–40
–50
–60
–70
–80
–90
0
0
10
0
0
512
512
Figure 15. AD7922 DNL Performance
Figure 14. AD7922 INL Performance
R
IN
1024
1024
= 500Ω
1536
1536
FREQUENCY (kHz)
CODE
CODE
2048
2048
R
100
IN
= 50Ω
R
IN
R
2560
2560
= 1kΩ
V
F
TEMPERATURE = 25 ° C
IN
V
F
TEMPERATURE = 25 ° C
V
SAMP
DD
DD
SAMP
DD
= 100Ω
= 2.7V
= 2.7V
= 3.6V
= 1MSPS
3072
3072
= 1MSPS
R
R
IN
IN
= 0Ω
= 10Ω
3584
3584
4096
4096
1000
Rev. 0 | Page 14 of 32
Figure 17. THD vs. Analog Input Frequency for Various Supply Voltages
–68
–70
–72
–74
–76
–78
–80
–82
–84
–86
–88
180
160
140
120
100
80
60
40
20
0
2.0
10
Figure 18. Shutdown Current vs. Supply Voltage
2.5
3.0
SUPPLY VOLTAGE (V)
FREQUENCY (kHz)
3.5
V
V
100
DD
DD
V
= 5.25V
= 2.7V
DD
4.0
TEMP = +85°C
TEMP = +25°C
TEMP = –40°C
V
= 2.35V
DD
= 4.75V
4.5
V
DD
5.0
= 3.6V
1000
5.5