AD7298-1 Analog Devices, AD7298-1 Datasheet - Page 10

• Manufacturer Part Number: AD7298-1
• Description: 8-Channel, 1 MSPS, 10-Bit SAR ADC
• Manufacturer: Analog Devices

Specifications of AD7298-1

• Resolution (bits): 10bit
• # 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

AD7298-1
Figure 10. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
–100
–102
–104
–106
–108
–110
–90
–92
–94
–96
–98
110
105
100
3.0
2.5
2.0
1.5
1.0
95
90
85
80
75
70
1k
0
0
V
V
V
Figure 11. Channel-to-Channel Isolation, f
DD
DRIVE
DD
Figure 9. V
50
= 3V
= V
0.5
= 3V
DRIVE
100
10k
1.0
= 3V
REF
150
RIPPLE FREQUENCY (Hz)
vs. Reference Output Current Drive
1.5
CURRENT LOAD (mA)
200
100k
f
NOISE
2.0
250
(kHz)
300
2.5
1M
350
3.0
400
3.5
IN
10M
= 50 kHz
450
4.0
500
100M
550
4.5
Rev. A | Page 10 of 24
Figure 12. SINAD vs. Analog Input Frequency for Various Source Impedances
62.00
61.75
61.50
61.25
61.00
60.75
60.50
62.0
61.5
61.0
60.5
60.0
59.5
59.0
58.5
58.0
–80
–81
–82
–83
–84
–85
–86
–87
–88
–89
–90
1.0
10
1.0
V
V
V
V
DD
DRIVE
DD
DRIVE
R
R
R
R
R
R
= 3V
= 3V
SOURCE
SOURCE
SOURCE
SOURCE
SOURCE
SOURCE
Figure 13. SINAD vs. Reference Voltage
= 3V
= 3V
Figure 14. THD vs. Reference Voltage
EXTERNAL REFERENCE VOLTAGE (V)
EXTERNAL REFERENCE VOLTAGE (V)
= 0Ω
= 10Ω
= 33Ω
= 47Ω
= 100Ω
= 200Ω
INPUT FREQUENCY (kHz)
1.5
1.5
100
2.0
2.0
V
V
DD
DRIVE
= 3V
= 3V
2.5
2.5