AD7991 Analog Devices, AD7991 Datasheet - Page 14

• 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

AD7991/AD7995/AD7999
1000
Figure 12. I
Figure 11. I
800
600
400
200
800
600
400
200
–0.2
–0.4
–0.6
–0.8
–1.0
1.0
0.8
0.6
0.4
0.2
0
0
Figure 10. DNL Error, V
0
2
2
0
f
f
V
V
f
SCL
SCL
SCL
DD
REF
Without Clock Stretching, −40°C to +125°C
500
= 5V
= 1.7MHz
= 3.4MHz
DD
DD
= 1.7MHz
with Clock Stretching, −40°C to +125°C
= 2.5V
Supply Current vs. Supply Voltage, f
Supply Current vs. Supply Voltage, f
1000
3
3
Without Clock Stretching
1500
DD
= 5 V, V
V
V
2000
DD
DD
CODE
4
4
(V)
(V)
REF
2500
= 2.5 V, f
3000
SCL
5
5
SCL
= 1.7 MHz
SCL
3500
= 1.7 MHz
= 3.4 MHz
+125°C
+85°C
+25°C
–40°C
+125°C
+85°C
+25°C
–40°C
4000
6
6
Rev. B | Page 14 of 28
Figure 14. AD7991 Channel-to-Channel Isolation , f
–100
Figure 13. THD vs. Input Frequency, V
–100
–120
–70
–80
–90
–20
–40
–60
–80
96
95
94
93
92
91
90
89
0
1
0
Without Clock Stretching, V
0
f
V
V
V
f
TEMPERATURE = T
SCL
SCL
Figure 15. Dynamic Performance, f
DD
DD
REF
10
= 5V
= 3V
= 1.7MHz
= 1.7MHz
= V
Seven-Term Blackman-Harris Window
DD
20
2
Without Clock Stretching
Without Clock Stretching
30
INPUT FREQUENCY (kHz)
A
4
FREQUENCY (kHz)
40
f
NOISE
V
V
DD
DD
10
50
DD
= 5V
= 3V
(kHz)
= 5 V, Full-Scale Input,
6
REF
60
= 2.5 V, f
SCL
70
= 405 kHz
16384 POINT FFT
f
f
f
SNR = 71.83dB
SINAD = 71.39dB
THD = –81.26dB
SFDR = –93.71dB
8
S
SCL
IN
= 22.5kSPS
= 5.13kHz
SCL
80
SCL
= 405kHz
= 1.7 MHz
= 1.7 MHz
90
10
100
100