Datasheet

Data Sheet AD7608
Rev. A | Page 17 of 32
80
85
90
95
100
105
110
NO OS OS × 2
OS × 4 OS × 8 OS × 16 OS × 32 OS × 64
DYNAMIC RANGE (dB)
OVERSAMPLING RATIO
AV
CC
, V
DRIVE
= 5V
T
A
= 25 °C
INTERNAL REFERENCE
f
SAMPLE
SCALES WITH OS RATIO
f
IN
SCALES WITH OS RATIO
±5V RANGE
±10V RANGE
08938-026
Figure 26. Dynamic Range vs. Oversampling Ratio
2.5010
2.5005
2.5000
2.4995
2.4990
2.4985
–40 –25 –10 5 20 35 50 65 80
2.4980
REFOUT VOLTAGE (V)
TEMPERATURE (°C)
AV
CC
= 4.75V
AV
CC
= 5V
AV
CC
= 5.25V
08938-129
Figure 27. Reference Output Voltage vs. Temperature for Different
Supply Voltages
8
–10 –8 –6 –4 –2 1086420
–10
–8
–6
–4
–2
0
2
4
6
INPUT CURRENT (µA)
INPUT VOLTAGE (V)
–40°C
+25°C
+85°C
AV
CC
, V
DRIVE
= 5V
f
SAMPLE
= 200kSPS
08938-028
Figure 28. Analog Input Current vs. Input Voltage Across Temperature
22
20
18
16
14
12
10
8
AV
CC
SUPPLY CURRENT (mA)
OVERSAMPLING RATIO
AV
CC
, V
DRIVE
= 5V
T
A
= 25°C
INTERNAL REFERENCE
f
SAMPLE
VARIES WITH OS RATE
NO OS OS2 OS4 OS8 OS16 OS32 OS64
08938-027
Figure 29. Supply Current vs. Oversampling Rate
140
0 11001000900800700600500400300200100
60
70
80
90
100
110
120
130
POWER SUPPLY REJECTION RATIO (dB)
AV
CC
NOISE FREQUENCY (kHz)
AV
CC
, V
DRIVE
= 5V
INTERNAL REFERENCE
AD7608 RECOMMENDED DECOUPLING USED
f
SAMPLE
= 200kSPS
T
A
= 25°C
±10V RANGE
±5V RANGE
08938-130
Figure 30. PSRR