Low-Power, +2.5V to +5.5V, 8-Bit

Voltage-Output DAC in µMAX

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9

X = Don’t Care

Table 3. Example Input Word

Table 4. Analog Output vs. Code

X = Don’t Care

Table 2. Serial-Interface Programming Commands

COMMAND

CONTROL BYTE

DATA BYTE

Loaded First

Loaded Last

UB1 UB2 UB3 C2

C1

C0 AB1 AB2

D7

D6

D5

D4

D3

D2

D1

D0

X

On

CS’s rising edge, wake up DAC.

DAC register unchanged.

X

X

X

X

X

1

X

X

X

X

X

X

X

X

X

X

Unassigned command

X

X

X

0

1

0

0

1

8-bit DAC data

On

CS’s rising edge, load DAC register.

Wake up DAC (if previously powered

down).

X

X

X

1

0

0

0

1

X

On

CS’s rising edge, power down DAC.

DAC output goes to zero. DAC register

unchanged.

X

X

X

1

1

0

0

1

8-bit DAC data

On

CS’s rising edge, power down DAC

and update DAC register. DAC output

goes to zero.

1

0

0

0

0

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

0

0

0

0

0

0

1

1

0

0

1

0

X

X

X

D0

D1

D2

D3

D4

D5

D6

D7

AB2

AB1

C0

C1

C2

UB3

UB2

UB1

Loaded First

Loaded Last

0

0

0

0

0

0

0

0

0

0

1

0

0

0

0

0

0

0

1

1

1

1

1

1

1

0

0

0

0

0

0

0

0

1

1

0

0

0

0

0

0

1

1

1

1

1

1

1

1

1

ANALOG

OUTPUT (V)

D0

D1

D2

D3

D4

D5

D6

D7

DAC REGISTER CONTENTS