AD7607 datasheet(28/32 Pages) AD

28 / 32 page

AD7608

Data Sheet

Rev. A | Page 28 of 32

OVERSAMPLING BY 64

1000

2000

3000

4000

6000

5000

7000

–1

CODE

465

6489

1238

Figure 52. Histogram of Codes—OS × 64 (3 Codes)

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 53 to Figure 58 show the digital filter frequency profiles

for oversampling by 2 to oversampling by 64. 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 AD7608. The digital filtering

combines steep roll-off and linear phase response.

–10

–20

–30

–40

–50

–60

–70

–80

100

10k

100k

10M

–90

FREQUENCY (Hz)

AVCC = 5V

VDRIVE = 5V

TA = 25°C

±10V RANGE

OS BY 2

Figure 53. Digital Filter OS × 2

–10

–20

–30

–40

–50

–60

–70

–80

100

10k

100k

10M

–100

–90

FREQUENCY (Hz)

AVCC = 5V

VDRIVE = 5V

TA = 25°C

±10V RANGE

OS BY 4

Figure 54. Digital Filter Response for OS × 4

–10

–20

–30

–40

–50

–60

–70

–80

100

10k

100k

10M

–100

–90

FREQUENCY (Hz)

AVCC = 5V

VDRIVE = 5V

TA = 25°C

±10V RANGE

OS BY 8

Figure 55. Digital Filter Response for OS × 8

–10

–20

–30

–40

–50

–60

–70

–80

100

10k

100k

10M

–100

–90

FREQUENCY (Hz)

AVCC = 5V

VDRIVE = 5V

TA = 25°C

±10V RANGE

OS BY 16

Figure 56. Digital Filter Response for OS × 16

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