AD7298 Analog Devices, AD7298 Datasheet - Page 9

• 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

TYPICAL PERFORMANCE CHARACTERISTICS
–100
–120
–0.2
–0.4
–0.6
–0.8
–1.0
–0.2
–0.4
–0.6
–0.8
–1.0
–20
–40
–60
–80
1.0
0.8
0.6
0.4
0.2
1.0
0.8
0.6
0.4
0.2
0
0
0
0
0
0
T
V
V
V
T
V
V
V
256
A
DRIVE
REF
DD
A
256
DRIVE
REF
DD
= 25°C
= 25°C
50
= 3 V
= 3 V
512
= 2.5V
512
= 2.5V
= 3V
= 3V
768
768
100
1024
1024
Figure 5. Typical ADC DNL
Figure 4.Typical ADC INL
150
1280
1280
Figure 3.Typical FFT
1536
1536
FREQUENCY (kHz)
200
1792
1792
CODE
CODE
2048
2048
250
2304
2304
300
2560
2560
V
f
f
f
SNR = 72.621
THD = –82.562
SAMPLE
IN
SCLK
DD
2816
2816
= 50kHz
350
= V
3072
= 20MHz
3072
DRIVE
= 1.17647MHz
3328
400
3328
3584
= 3V
3584
450
3840
3840
4096
4096
500
Rev. B | Page 9 of 24
0.6
0.4
0.2
0.2
0.4
0.6
–0.2
–0.4
–0.6
12
10
11
0
0.6
0.4
0.2
9
8
7
6
5
4
3
2
1.00
0
0
1.00
T
V
V
A
DRIVE
DD
T
V
V
= 25°C
A
DRIVE
DD
1.25
= 3V
Figure 8. Effective Number of Bits vs. V
= 25°C
1.25
= 3V
= 3V
0.5
= 3V
1.50
1.50
REFERENCE VOLTAGE (V)
Figure 7. DNL vs. V
Figure 6. INL vs. V
REFERENCE VOLTAGE (V)
1.0
1.75
1.75
V
INL MAX
REF
INL MIN
(V)
DNL MAX
DNL MIN
2.00
2.00
1.5
REF
REF
2.25
2.25
2.0
REF
V
V
DD
DRIVE
2.50
2.50
= 3V
AD7298
= 3V
2.75
2.5
2.75