AD7607 datasheet(30/36 Pages) AD

30 / 36 page

AD7609

Data Sheet

Rev. A | Page 30 of 36

OVERSAMPLING BY 16

500

1000

1500

2000

3000

4000

2500

3500

4500

–2

–3

–1

CODE

385

406

3279

3833

657

Figure 51. Histogram of Codes—OS × 16 (Six Codes)

5090

341

OVERSAMPLING BY 32

1000

2000

3000

4000

5000

6000

–2

–1

CODE

2716

Figure 52. Histogram of Codes—OS × 32 (Four Codes)

5871

OVERSAMPLING BY 64

1000

2000

3000

4000

6000

5000

7000

–2

–1

CODE

2245

Figure 53. Histogram of Codes – OS × 64 (Four 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 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.

–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 54. Digital Filter Response for 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 55. Digital Filter Response for OS × 4

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