MAX1221 datasheet(32/44 Pages) MAXIM

32 / 44 page

12-Bit, Multichannel ADCs/DACs with FIFO,

Temperature Sensing, and GPIO Ports

______________________________________________________________________________________

Table 18. DAC Power-Up and Power-Down Commands

CONTROL

BITS

DATA BITS

C3 C2 C1 C0

D3 D2 D1 D0

DESCRIPTION

FUNCTION

——— ————— 0

Power-Up

Power up individual DAC buffers indicated by data

in DAC0 through DAC3. A one indicates the DAC

output is connected and active. A zero does not

affect the DAC’s present state.

——— ————— 0

Power-Down 1

Power down individual DAC buffers indicated by

data in DAC0 through DAC3. A one indicates the

DAC output is disconnected and high impedance.

A zero does not affect the DAC’s present state.

——— ————— 1

Power-Down 2

Power down individual DAC buffers indicated by

data in DAC0 through DAC3. A one indicates the

DAC output is disconnected and pulled to AGND

with a 1k

Ω resistor. A zero does not affect the DAC’s

present state.

——— ————— 0

Power-Down 3

Power down individual DAC buffers indicated by

data in DAC0 through DAC3. A one indicates the

DAC output is disconnected and pulled to AGND

with a 100k

Ω resistor. A zero does not affect the

DAC’s present state.

——— ————— 1

Power-Down 4

Power down individual DAC buffers indicated by

data in DAC0 through DAC3. A one indicates the

DAC output is disconnected and pulled to REF1 with

a 100k

Ω resistor. A zero does not affect the DAC’s

present state.

Table 17. DAC Serial-Interface Configuration (continued)

16-BIT SERIAL WORD

MSB

LSB

CONTROL BITS

DATA BITS

C3 C2 C1 C0 D11 D10 D9

DESCRIPTION

FUNCTION

——

—————

DAC0–7

D11–D0 to input registers 0–7

(MAX1221/MAX1223). D11–D0 to

input registers 0–3 (MAX1343).

DAC outputs unchanged.

DAC

XXXX

DAC0–7

Input registers to DAC registers

indicated by ones, DAC outputs

updated, equivalent to software

LDAC. (No effect on DACs

indicated by zeros.) DAC7–DAC4

are only valid on the MAX1221/

MAX1223. These are don’t-care

bits for the MAX1343.

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