AD7991 Analog Devices, AD7991 Datasheet - Page 13

• Manufacturer Part Number: AD7991
• Description: 4-Channel, 12-Bit ADC with I2C Compatible Interface in 8-Lead SOT-23
• Manufacturer: Analog Devices

Specifications of AD7991

• Resolution (bits): 12bit
• # Chan: 4
• Sample Rate: 140kSPS
• Interface: I²C/Ser 2-Wire
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni Vdd
• Adc Architecture: SAR
• Pkg Type: SOT

TYPICAL PERFORMANCE CHARACTERISTICS
12.0
11.5
11.0
10.5
10.0
9.5
9.0
8.5
8.0
–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
Figure 4. DNL Error, V
1.0
0.8
0.6
0.4
0.2
Figure 6. ENOB/SINAD vs. Reference Voltage, f
Figure 5. INL Error, V
0
0
0
0
0
ENOB V
500
500
1
DD
SINAD V
= 3V
1000
1000
Without Clock Stretching
Without Clock Stretching
Without Clock Stretching
REFERENCE VOLTAGE (V)
2
DD
DD
DD
1500
1500
= 2.7 V, V
= 2.7 V, V
= 3V
ENOB V
2000
2000
3
CODE
CODE
REF
REF
SINAD V
DD
= 2.35 V, f
= 2.35 V, f
2500
2500
= 5V
4
DD
V
V
f
V
V
f
SCL
SCL
DD
REF
3000
DD
REF
3000
= 5V
SCL
SCL
SCL
= 2.7V
= 2.7V
= 1.7MHz
= 1.7MHz
= 2.35V
= 2.35V
= 1.7 MHz
5
= 1.7 MHz
= 1.7 MHz
3500
3500
4000
4000
6
74
72
70
68
66
64
62
60
Rev. B | Page 13 of 28
–0.2
–0.4
–0.6
–0.8
–1.0
–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
1.0
0.8
0.6
0.4
0.2
0
0
0
Figure 8. DNL Error vs. Reference Voltage, f
Figure 7. INL Error vs. Reference Voltage , f
Figure 9. INL Error, V
1.2
1.2
0
V
V
f
SCL
DD
REF
500
= 5V
= 1.7MHz
1.7
1.7
= 2.5V
1000
Without Clock Stretching
Without Clock Stretching
Without Clock Stretching
NEGATIVE DNL
2.2
POSITIVE DNL
2.2
NEGATIVE INL
REFERENCE VOLTAGE (V)
REFERENCE VOLTAGE (V)
POSITIVE INL
AD7991/AD7995/AD7999
1500
DD
2.7
2.7
= 5 V, V
2000
CODE
REF
3.2
3.2
= 2.5 V, f
2500
3.7
3.7
3000
SCL
SCL
SCL
= 1.7 MHz
= 1.7 MHz
= 1.7 MHz
4.2
4.2
3500
4.7
4.7
4000