AD7609BSTZ Analog Devices Inc, AD7609BSTZ Datasheet - Page 30

• Manufacturer Part Number: AD7609BSTZ
• Description: 58T8900
• Manufacturer: Analog Devices Inc

Specifications of AD7609BSTZ

• Resolution (bits): 18bit
• Sampling Rate: 250kSPS
• Input Channel Type: Differential
• Data Interface: Serial, SPI
• Supply Voltage Range - Analog: 4.75V To 5.25V
• Rohs Compliant: Yes

AD7609
4500
4000
3500
3000
2500
2000
1500
1000
6000
5000
4000
3000
2000
1000
7000
6000
5000
4000
3000
2000
1000
500
0
0
0
Figure 52. Histogram of Codes—OS × 32 (Four Codes)
Figure 53. Histogram of Codes – OS × 64 (Four Codes)
Figure 51. Histogram of Codes—OS × 16 (Six Codes)
OVERSAMPLING BY 32
OVERSAMPLING BY 64
–3
OVERSAMPLING BY 16
3
–2
–2
45
1
406
–2
2716
2245
–1
–1
3279
–1
CODE
CODE
CODE
3833
0
5090
5871
0
0
385
657
1
341
75
1
1
14
2
Rev. 0 | Page 30 of 36
When the oversampling mode is selected, this has the effect
of adding a digital filter function after the ADC. The different
oversampling rates and the CONVST x sampling frequency
produces different digital filter frequency profiles.
Figure 54 to Figure 59 show the digital filter frequency profiles
for the different oversampling rates. The combination of the
analog antialiasing filter and the oversampling digital filter can
be used to eliminate or reduce the complexity of the design of
the filter before the AD7609. The digital filtering combines
steep roll-off and linear phase response.
–100
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
0
100
100
Figure 54. Digital Filter Response for OS × 2
Figure 55. Digital Filter Response for OS × 4
1k
1k
FREQUENCY (Hz)
FREQUENCY (Hz)
10k
10k
100k
100k
1M
1M
AV
V
T
10V RANGE
OS BY 2
AV
V
T
10V RANGE
OS BY 4
DRIVE
A
DRIVE
A
CC
CC
= 25°C
= 25°C
= 5V
= 5V
= 5V
= 5V
10M
10M