Datasheet

AD7609 Data Sheet
Rev. A | Page 18 of 36
09760-023
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
±10V RANGE
±5V RANGE
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
09760-029
Figure 27. Reference Output Voltage vs. Temperature for Different Supply
Voltages
–15
–10
–5
0
5
10
–20 –15 –10 –5 0 5 10 15 20
CURRENT (µA)
DIFFERENTIAL ANALOG INPUT VOLTAGE (Vx+ – (Vx–)) (V)
+25°C V+
+25°C V–
+85°C V–
+85°C V+
–40°C V–
–40°C V+
AV
CC
, V
DRIVE
= 5V
f
SAMPLE
= 200kSPS
09760-025
Figure 28. Analog Input Current vs. Input Voltage Over 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 OS × 2 OS × 4 OS × 8 OS × 16 OS × 32 OS × 64
09760-227
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
AD7609 RECOMMENDED DECOUPLING USED
f
SAMPLE
= 200kSPS
T
A
= 25°C
±10V RANGE
±5V RANGE
09760-130
Figure 30. PSRR
–100
–90
–80
–70
–60
–50
–40
–30
–20
0
–10
10 100 1k 10k 100k
CMRR (dB)
FREQUENCY (Hz)
±10V RANGE
±5V RANGE
AV
CC
, V
DRIVE
= 5V
T
A
= 25°C
f
SAMPLE
= 200kSPS
INTERNAL REFERENCE
09760-028
Figure 31. CMRR vs. Common-Mode Ripple Frequency