ADS58C48IPFPR datasheet(51/70 Pages) TI

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ADS58C48

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SLAS689 – MAY 2010

DIGITAL FUNCTIONS

The device has several useful digital functions such as test patterns, gain, offset correction and SNRBoost.

These can be controlled using two control bits <DIGITAL MODE 1> and <DIGITAL MODE 2> as per Table 8.

Table 8. Digital Functions Control Bits

DIGITAL

DESCRIPTION

FUNCTION

All digital functions

–

disabled

Only SNRBoost 3G

Set register bit <SNRBoost CH x ON> OR use the SNRB pins(1)

enabled

Test patterns, gain

–

and offset correction

disabled

SNRBoost 3G

To turn ON SNRBoost 3G, set register bit <SNRBoost CH x ON> OR

enabled

use the SNRB pins (1)

Test patterns

Use register bits <TEST PATTERNS CH x> to select required pattern

enabled

Gain enabled

Device is in 0 dB gain mode, use bits <GAIN> to choose other gain

settings(2)

Offset correction

Use <EN OFFSET CORR> to turn ON the offset correction. Use

enabled

<OFFSET CORR TIME CONSTANT> to choose the time constant (3)

(1)

Refer to section SNR ENHANCEMENT USING SNRBOOST

(2)

Refer to section GAIN FOR SFDR/SNR TRADE-OFF

(3)

Refer to section OFFSET CORRECTION

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