MAX5294 datasheet(21/33 Pages) MAXIM

21 / 33 page

Buffered, Fast-Settling, Dual, 12-/10-/8-Bit,

Voltage-Output DACs

______________________________________________________________________________________

Default register values at power-up correspond to the

state of PU, e.g. input and DAC registers are set to

800hex if PU is floating, FFFhex if PU = DVDD, and

000hex if PU= DGND.

DAC Programming Examples:

To load input register A from the shift register, leaving

DAC register A unchanged (DAC output unchanged),

use the command in Table 3.

The MAX5290–MAX5295 can load DAC register A from

the shift register, leaving input register A unchanged,

by using the command in Table 4.

To load input register A and DAC register A simultane-

ously from the shift register, use the command in Table 5.

For the 10-bit and 8-bit versions, set sub-bits = 0 for

best performance.

Advanced Feature

Programming Commands

Refer to the Programmer’s Handbook for details.

Select Bits (MA, MB)

The select bits allow synchronous updating of any com-

bination of channels. The select bits command the

loading of the DAC register from the input register of

each channel. Set the select bit M_ = 1 to load the DAC

“_” is replaced with A or B depending on the selected

channel. Setting the select bit to M_ = 0 results in no

action for that channel (Table 6).

Table 3. Load Input Register A from Shift Register

Table 4. Load DAC Register A from Shift Register

Table 5. Load Input Register A and DAC Register A from Shift Register

Table 6. Select Command

DATA

CONTROL BITS

DATA BITS

DIN

D11

D10

D3/0

D2/0

D1/0

D0/0

DATA

CONTROL BITS

DATA BITS

DIN

D11

D10

D3/0

D2/0

D1/0

D0/0

DATA

CONTROL BITS

DATA BITS

DIN

D11

D10

D3/0

D2/0

D1/0

D0/0

DATA

CONTROL BITS

DATA BITS

DIN

Table 7. Select Bits Programming Example

DATA

CONTROL BITS

DATA BITS

DIN

XXX

X = Don’t care.

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