AD7298 Analog Devices, AD7298 Datasheet - Page 10

• Manufacturer Part Number: AD7298
• Description: 8-Channel, 1MSPS, 12-Bit SAR ADC with Temperature Sensor
• Manufacturer: Analog Devices

Specifications of AD7298

• Resolution (bits): 12bit
• # Chan: 8
• Sample Rate: 1MSPS
• Interface: SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni 1.0V,Uni 1.25,Uni 2.0V,Uni 2.5V
• Adc Architecture: SAR
• Pkg Type: CSP

AD7298
Figure 11. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
–100
–102
–104
–106
–108
–110
–90
–92
–94
–96
–98
Figure 10. Response to Thermal Shock from Room Temperature
3.0
2.5
2.0
1.5
1.0
0.5
55
50
45
40
35
30
25
20
1k
0
0
0
V
V
V
DD
DRIVE
DD
Figure 9. V
= 3V
= V
0.5
= 3V
DRIVE
10k
20
1.0
= 3V
REF
RIPPLE FREQUENCY (Hz)
vs. Reference Output Current Drive
into 50°C Stirred Oil
1.5
CURRENT LOAD (mA)
100k
TIME (Seconds)
40
2.0
2.5
1M
60
3.0
10M
3.5
80
4.0
100M
100
4.5
Rev. B | Page 10 of 24
Figure 13. SINAD vs. Analog Input Frequency for Various Source Impedances
110
105
100
95
90
85
80
75
70
76
74
72
70
68
66
64
62
60
75
70
65
60
55
50
45
40
35
30
25
20
15
0
10
0
Figure 12. Channel-to-Channel Isolation, f
R
IN
50
= 47Ω
R
Figure 14. SINAD vs. Reference Voltage
100
IN
0.5
= 0Ω
150
INPUT FREQUENCY (kHz)
200
1.0
f
NOISE
250
V
REF
(kHz)
300
(V)
100
R
1.5
IN
350
= 47Ω
R
IN
400
= 100Ω
R
IN
R
IN
IN
= 33Ω
2.0
V
V
= 50 kHz
450
= 200Ω
DD
DRIVE
= 3V
500
= 3V
500
550
2.5