Datasheet

MAX5590–MAX5595
Buffered, Fast-Settling, Octal, 12/10/8-Bit,
Voltage-Output DACs
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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 of 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 = DV
DD
, 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
DIN10111000XXXX1001
X = Don’t care.
Table 14. Settling-Time-Mode Read Command
DATA CONTROL BITS DATA BITS
DIN10111001XXXXXXXX
D OU TRBXXXXXXXXS P D H S P D GS P D FS P D E S P D D S P D C S P D BS P D A
Table 17. CPOL and CPHA Read Command
DATA CONTROL BITS DATA BITS
DIN 1 1 0 0 0 0 0 1 X X X X X X X X
D OU TRBXXX XXXX XXXXX XXC P O LC P H A
Table 15. CPOL and CPHA Bits
CPOL CPHA DESCRIPTION
00
Default values at power-up when DSP is connected to DV
DD
. Data is clocked in on the rising edge
of SCLK.
01
Default values at power-up when DSP is connected to DGND. Data is clocked in on the falling edge
of SCLK.
1 0 Data is clocked in on the falling edge of SCLK.
1 1 Data is clocked in on the rising edge of SCLK.
Table 16. CPOL and CPHA Write Command
DATA CONTROL BITS DATA BITS
DIN11000000XXXXXXC P O LC P H A
X = Don’t care.
X = Don’t care.
X = Don’t care.