AD7291 Analog Devices, AD7291 Datasheet - Page 9

• Manufacturer Part Number: AD7291
• Description: 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor
• Manufacturer: Analog Devices

Specifications of AD7291

• Resolution (bits): 12bit
• # Chan: 8
• Sample Rate: 22.2kSPS
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref)
• Adc Architecture: SAR
• Pkg Type: CSP

Data Sheet
Figure 11. Response to Thermal Shock from Room Temperature into 50°C
Figure 12. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
–100
–102
–104
–106
–108
–110
–90
–92
–94
–96
–98
3.0
2.5
2.0
1.5
1.0
0.5
55
50
45
40
35
30
25
20
0
1k
0
0
V
V
V
DD
DRIVE
DD
= 3V
= V
0.5
Figure 10. V
= 3V
DRIVE
10k
20
1.0
= 3V
RIPPLE FREQUENCY (Hz)
1.5
REF
CURRENT LOAD (mA)
100k
vs. Reference Output Drive
TIME (Seconds)
40
Stirred Oil
2.0
2.5
1M
60
3.0
10M
3.5
80
4.0
100M
100
4.5
Rev. B | Page 9 of 28
Figure 14. SINAD vs. Reference Voltage, f
–0.5
–1.0
–1.5
–2.0
125
120
115
110
105
100
1.5
1.0
0.5
72
71
70
69
95
90
85
80
75
0
–40
0
1
Figure 13. Channel-to-Channel Isolation, f
V
V
DRIVE
DD
–25
= 3V
Figure 15. Temperature Accuracy at 3 V
= 3V
–10
0.5
5
EXTERNAL REFERENCE (V)
10
TEMPERATURE (°C)
20
1.0
f
NOISE
35
(kHz)
50
SCL
1.5
= 400 kHz, f
65
100
V
f
SCL
80
DD
IN
= V
= 400kHz
= 10 kHz
2.0
95
DRIVE
s
= 22.22 kSPS
AD7291
110 125
= 3V
2
1k
.5