AD7608 Analog Devices, AD7608 Datasheet - Page 17

• Manufacturer Part Number: AD7608
• Description: 8-Channel DAS with 18-Bit, Bipolar, Simultaneous Sampling ADC
• Manufacturer: Analog Devices

Specifications of AD7608

• Resolution (bits): 18bit
• # Chan: 8
• Sample Rate: 200kSPS
• Interface: Par,Ser,SPI
• Analog Input Type: Diff-Bip
• Ain Range: Bip 10V,Bip 5.0V
• Adc Architecture: SAR
• Pkg Type: QFP

Data Sheet
Figure 28. Analog Input Current vs. Input Voltage Across Temperature
Figure 27. Reference Output Voltage vs. Temperature for Different
2.5010
2.5005
2.5000
2.4995
2.4990
2.4985
2.4980
–10
105
100
110
–2
–4
–6
–8
95
90
85
80
8
6
4
2
0
–10
–40
AV
f
NO OS
Figure 26. Dynamic Range vs. Oversampling Ratio
SAMPLE
AV
AV
CC
–8
CC
CC
, V
–25
DRIVE
= 5V
= 4.75V
= 200kSPS
OS × 2
–6
= 5V
–10
–4
OS × 4 OS × 8 OS × 16 OS × 32 OS × 64
OVERSAMPLING RATIO
Supply Voltages
INPUT VOLTAGE (V)
TEMPERATURE (°C)
5
–2
±10V RANGE
AV
T
INTERNAL REFERENCE
f
f
SAMPLE
IN
A
CC
SCALES WITH OS RATIO
= 25 °C
20
0
, V
AV
DRIVE
SCALES WITH OS RATIO
CC
2
±5V RANGE
35
= 5.25V
= 5V
4
50
6
65
+85°C
+25°C
–40°C
8
80
10
Rev. A | Page 17 of 32
22
20
18
16
14
12
10
NO OS
140
130
120
110
100
8
90
80
70
60
0
AV
T
INTERNAL REFERENCE
f
SAMPLE
A
CC
Figure 29. Supply Current vs. Oversampling Rate
= 25°C
100
, V
OS2
DRIVE
VARIES WITH OS RATE
200
= 5V
±10V RANGE
300
AV
AV
INTERNAL REFERENCE
AD7608 RECOMMENDED DECOUPLING USED
f
T
SAMPLE
A
OS4
OVERSAMPLING RATIO
CC
CC
= 25°C
Figure 30. PSRR
, V
400
NOISE FREQUENCY (kHz)
DRIVE
= 200kSPS
500
OS8
= 5V
±5V RANGE
600
OS16
700
800
OS32
900
1000
AD7608
OS64
1100