ADS4449 datasheet(32/54 Pages) TI

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ADS4449

SBAS603 – APRIL 2013

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DIGITAL GAIN CH C

DIGITAL GAIN BYPASS CH C

TEST PATTERN CH C

Bits D[7:4]

DIGITAL GAIN CH C: Channel C digital gain programmability

These bits set the digital gain programmability from 0 dB to 6 dB in 0.5-dB steps for

channel C. Set the DIGITAL ENABLE bit to '1' beforehand to enable this feature.

0000 = 0-dB gain (default)

0001 = 0.5-dB gain

0010 = 1-dB gain

0011 = 1.5-dB gain

0100 = 2-dB gain

0101 = 2.5-dB gain

0110 = 3-dB gain

0111 = 3.5-dB gain

1000 = 4-dB gain

1001 = 4.5-dB gain

1010 = 5-dB gain

1011 = 5.5-dB gain

1100 = 6-dB gain

Bit D3

DIGITAL GAIN BYPASS CH C: Channel C digital gain bypass

0 = Normal operation (default)

1 = Digital gain feature for channel A is bypassed

Bits D[2:0]

TEST PATTERN CH C: Channel C test pattern programmability

These bits program the test pattern for channel C.

000 = Normal operation (default)

001 = Outputs all 0s

010 = Outputs all 1s

011 = Outputs toggle pattern

Output data ([D:0]) are an alternating sequence of 01010101010101 and

10101010101010.

100 = Outputs digital ramp

Output data increments by one 14-bit LSB every clock cycle from code 0 to code

16383

101 = Outputs custom pattern

To program a test pattern, use the CUSTOM PATTERN D[13:0] bits of registers 3Fh

and 40h.

110 = Unused

111 = Unused

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