AD7291_11 AD [Analog Devices], AD7291_11 Datasheet - Page 8

• Manufacturer Part Number: AD7291_11
• Description: 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor
• Manufacturer: AD [Analog Devices]

AD7291
TYPICAL PERFORMANCE CHARACTERISTICS
–0.2
–0.4
–0.6
–0.8
–1.0
–0.2
–0.4
–0.6
–0.8
–1.0
–100
–120
–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
f
f
S
SCL
V
f
f
f
SNR = 71.209
THD = –81.66
A
DRIVE
REF
DD
S
SCL
IN
DD
= 22.22ksps
= 25°C
= 22.22ksps
= 10kHz
500
500
= 3V
= 400kHz
= V
= 2.5V
= 400kHz
= 3V
DRIVE
2k
1000
1000
Figure 6. Typical ADC DNL
Figure 5. Typical ADC INL
= 3V
Figure 4. Typical FFT
1500
1500
4k
FREQUENCY (Hz)
ADC CODE
ADC CODE
2000
2000
6k
2500
2500
3000
3000
8k
T
V
V
V
f
f
S
SCL
A
3500
DRIVE
REF
DD
3500
= 22.22ksps
= 25°C
= 3V
= 400kHz
= 2.5V
= 3V
10k
4096
4096
Rev. 0 | Page 8 of 28
11.7
11.6
11.5
11.4
11.3
11.2
–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
0
0
0
0
0
Figure 9. Effective Number of Bits vs. V
T
V
V
f
f
S
SCL
T
V
V
f
f
A
DRIVE
DD
S
SCL
A
= 22.22ksps
DRIVE
DD
= 25°C
= 22.22ksps
= 25°C
= 3V
= 400kHz
= 3V
= 400kHz
0.5
0.5
= 3V
0.5
= 3V
Figure 8. DNL vs. External V
Figure 7. INL vs. External V
EXTERNAL REFERENCE (V)
1.0
1.0
1.0
V
V
REF
REF
1.5
1.5
(V)
(V)
1.5
2.0
2.0
REF
REF
INL (POSITIVE)
INL (NEGATIVE)
DNL (POSITIVE)
DNL (NEGATIVE)
REF
, f
SCL
2.0
= 400 kHz
2.5
2.5
2.5
3.0
3.0