Datasheet

Data Sheet AD7291
Rev. C | Page 9 of 28
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
CURRENT LOAD (mA)
V
REF
(V)
V
DD
= V
DRIVE
= 3V
08711-021
Figure 10. V
REF
vs. Reference Output Drive
20
25
30
35
40
45
50
55
0 20 40 60 80 100
TEMPERATURE READING (°C)
TIME (Seconds)
0871
1-014
Figure 11. Response to Thermal Shock from Room Temperature into 50°C
Stirred Oil
–1
10
–108
–106
–104
–102
–100
–98
–96
–94
–92
–90
1k
10k
100k
1M 10M 100M
PSRR (dB)
RIPPLE FREQUENCY (Hz)
V
DD
= 3V
V
DRIVE
= 3V
0871
1-061
Figure 12. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
125
120
115
110
105
100
95
90
85
80
75
1 10 100 1k
f
NOISE
(kHz)
CHANNEL-TO-CHANNEL ISOLATION (dB)
08711-018
V
DD
= V
DRIVE
= 3V
f
SCL
= 400kHz
Figure 13. Channel-to-Channel Isolation, f
IN
= 10 kHz
72
71
70
69
0 2.52.01.51.00.5
SINAD (dB)
EXTERNAL REFERENCE (V)
08711-036
V
DRIVE
= 3V
V
DD
= 3V
Figure 14. SINAD vs. Reference Voltage, f
SCL
= 400 kHz, f
s
= 22.22 kSPS
–2.0
–1.0
–1.5
–0.5
0
0.5
1.0
1.5
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPER
ATURE (°C)
TEMPERATURE ERROR (°C)
08711-017
Figure 15. Temperature Accuracy at 3 V