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EXAMPLE:

TLV5636

SLAS223C – JUNE 1999 – REVISED APRIL 2004

The meaning of the 12 data bits depends on the selected register. For the DAC register, the 12 data bits

determine the new DAC output value:

Data Bits: DAC

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

New DAC value

If the control register is selected, then D1, D0 of the 12 data bits are used to program the reference voltage:

Data Bits: CONTROL

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

X

X

X

X

X

X

X

X

X

REF1

REF0

(1)

X = don't care

REF1 and REF0 determine the reference source. If internal reference is selected, REF1 and REF0 determine the

reference voltage.

Reference Bits

REF1

REF0

REFERENCE

0

0

External

0

1

1.024 V

1

0

2.048 V

1

1

External

CAUTION:

If external reference voltage is applied to the REF pin, external reference MUST

be selected.

•

Set DAC output, select fast mode, select internal reference at 2.048 V:

Set reference voltage to 2.048 V (CONTROL register):

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

1

1

0

1

0

0

0

0

0

0

0

0

0

0

1

0

Write new DAC value and update DAC output:

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

0

1

0

0

New DAC output value

The DAC output is updated on the rising clock edge after D0 is sampled.

To output data consecutively using the same DAC configuration, it is not necessary to program the CONTROL

register again.

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