ADS58C28IRGC datasheet(49/67 Pages) TI

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ADS58C28

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SBAS509B – JUNE 2010 – REVISED OCTOBER 2010

To use SNRBoost3G with control pins, follow this exact sequence:

Select and Enable the SNRBoost3G Filter

1. First, disable the DIGITAL MODE 1 and DIGITAL MODE 2 bits (set to '0').

2. Next, select the appropriate SNRBoost3G filter, using the Ch SNRBoost3G Filter number register bits.

3. Finally, set the DIGITAL MODE 2 bit (set to '1').

Turn On/Off SNRBoost3G

1. Use the CTRL1, CTRL2, and CTRL3 pins to dynamically turn on/off the SNRBoost3G for each pair of

channels.

To use SNRBoost3G without using control pins follow this exact sequence:

Select and Enable the SNRBoost3G Filter

1. First, disable the DIGITAL MODE 1 and DIGITAL MODE 2 bits (set to '0').

2. Next, select the appropriate SNRBoost3G filter using the Ch SNRBoost Filter number register bits.

3. Then set the DIGITAL MODE 2 bit (set to '1').

4. Finally, set the SNRBoost3G pin override bit (OVERRIDE SNRBoost PINS).

Turn On/Off SNRBoost3G

1. Turn on and off the SNRBoost3G for each channel using the SNRBoost CH A ON and SNRBoost CH B ON

NOTE

To use a different SNRBoost3G filter, it is required to follow all the above steps in the exact

order specified. Not following this order can result in incorrect operation of the

SNRBoost3G filter. To turn on and off the filter without changing the filter number, simply

follow the steps under the Turn On/Off SNRBoost3G outline.

Table 13 describes the SNRBoost3G control when used with the CTRL pins.

Table 13. SNRBoost3G Control Using Pins CTRL1, CTRL2, and CTRL3

CTRL1

CTRL2

CTRL3

DESCRIPTION

Low

Normal operation; SNRBoost3G disabled for both channels

Low

High

SNRBoost3G enabled for channel B

Low

High

Low

SNRBoost3G enabled for channel A

Low

High

SNRBoost3G enabled for channels A and B

High

Low

Global power-down

High

Low

High

Channel A standby

High

Low

Do not use

MUX mode of operation, channels A and B data are multiplexed and

High

output on pins CHB_D[10:0].

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