ADS5295IPFP datasheet(69/91 Pages) TI

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ADS5295

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SBAS595 – DECEMBER 2012

Digital Averaging

The ADS5295 includes an averaging function where the ADC digital data from two (or four) channels can be

averaged. The averaged data are output on specific LVDS channels. Table 13 shows the combinations of the

input channels that can be averaged and the LVDS channels on which the averaged data are available.

Table 13. Using Channel Averaging

OUTPUT WHERE

AVERAGED CHANNELS

AVERAGED DATA ARE

AVAILABLE AT

1, 2

OUT1A, OUT1B

Set AVG_OUT1 = 10 and EN_CHANNEL_AVG = 1

1, 2

OUT3A, OUT3B

Set AVG_OUT3 = 11 and EN_CHANNEL_AVG = 1

3, 4

OUT4A, OUT4B

Set AVG_OUT4 = 10 and EN_CHANNEL_AVG = 1

3, 4

OUT2A, OUT2B

Set AVG_OUT2 = 11 and EN_CHANNEL_AVG = 1

1, 2, 3, 4

OUT1A, OUT1B

Set AVG_OUT1 = 11 and EN_CHANNEL_AVG = 1

1, 2, 3, 4

OUT4A, OUT4B

Set AVG_OUT4 = 11 and EN_CHANNEL_AVG = 1

5, 6

OUT5A, OUT5B

Set AVG_OUT5 = 10 and EN_CHANNEL_AVG = 1

5, 6

OUT7A, OUT7B

Set AVG_OUT7 = 11 and EN_CHANNEL_AVG = 1

7, 8

OUT8A, OUT8B

Set AVG_OUT8 = 10 and EN_CHANNEL_AVG = 1

7, 8

OUT6A, OUT6B

Set AVG_OUT6 = 11 and EN_CHANNEL_AVG = 1

5, 6, 7, 8

OUT5A, OUT5B

Set AVG_OUT5 = 11 and EN_CHANNEL_AVG = 1

5, 6, 7, 8

OUT8A, OUT8B

Set AVG_OUT8 = 11 and EN_CHANNEL_AVG = 1

Performance with Digital Processing Blocks

In applications where higher SNR performance is desired, digital processing blocks (such as averaging and

decimation filters) can be used advantageously to achieve this. Table 14 shows the improvement in SNR that

can be achieved compared to the default value, using these modes.

Table 14. SNR Improvement Using Digital Processing

TYPICAL IMPROVEMENT IN

MODE(1)

TYPICAL SNR (dB)(2)

SNR (dB)

Default

70.6

With decimate-by-2 filter enabled

74.64

4.04

With decimate-by-4 filter enabled

76.13

5.53

With decimate-by-8 filter enabled

77.04

6.44

With two channels averaged and decimate-by-4 filter enabled

77.43

6.83

With four channels averaged

76.14

5.54

With four channels averaged and decimate-by-4 filter enabled

79.27

8.67

(1)

Custom coefficients are used for the decimate-by-8 filter.

(2)

In all these modes (except the default one), 14x serialization is used to capture data.

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