MAX5590 datasheet(25/33 Pages) MAXIM

25 / 33 page

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

Voltage-Output DACs

______________________________________________________________________________________

Settling-Time-Mode Write Example:

To configure DACA and DACD into FAST mode and

DACB and DACC into SLOW mode, use the command

in Table 13.

To read back the settling-time-mode bits, use the com-

mand in Table 14.

CPOL and CPHA Control Bits

The

CPOL

and

CPHA

control

bits

the

MAX5590–MAX5595 are defined the same as the CPOL

and CPHA bits in the SPI standard. Set the DAC’s

CPOL and CPHA bits to CPOL = 0 and CPHA = 0 or

CPOL = 1 and CPHA = 1 for MICROWIRE and SPI

applications requiring the clocking of data in on the ris-

ing edge of SCLK. Set the DAC’s CPOL and CPHA bits

to CPOL = 0 and CPHA = 1 or CPOL = 1 and CPHA =

0 for DSP and SPI applications, requiring the clocking

of data in on the falling edge of SCLK (refer to the

Programmer’s Handbook and see Table 15 for details).

At power-up, if DSP = DVDD, the default value of CPHA

is zero and if DSP = DGND, the default value of CPHA

is one. The default value of CPOL is zero at power-up.

To write to the CPOL and CPHA bits, use the command

in Table 16.

To read back the device’s CPOL and CPHA bits, use

the command in Table 17.

Table 13. Settling-Time-Mode Write Example

DATA

CONTROL BITS

DATA BITS

DIN

X = Don’t care.

Table 14. Settling-Time-Mode Read Command

DATA

CONTROL BITS

DATA BITS

DIN

110

XXX

DOUTRB

XXX

SPDH SPDGSPDFSPDE SPDD SPDC SPDB SPDA

Table 17. CPOL and CPHA Read Command

DATA

CONTROL BITS

DATA BITS

DIN

DOUTRB

CPOL

CPHA

Table 15. CPOL and CPHA Bits

CPOL

CPHA

DESCRIPTION

Default values at power-up when DSP is connected to DVDD. Data is clocked in on the rising edge

of SCLK.

Default values at power-up when DSP is connected to DGND. Data is clocked in on the falling edge

of SCLK.

Data is clocked in on the falling edge of SCLK.

Data is clocked in on the rising edge of SCLK.

Table 16. CPOL and CPHA Write Command

DATA

CONTROL BITS

DATA BITS

DIN

00X

CPOL CPHA

X = Don’t care.

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