Rainbow-electronics MAX5223 Manual de usuario descargar pdf (Pagina 9)

MAX5223

Low-Power, Dual, 8-Bit, Voltage Output

Serial DAC in 8-Pin SOT23

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Table 2. Serial-Interface Programming Commands

Table 3. Example of a 16-Bit Input Word

X = Don’t care.

* = Not shown, for the sake of clarity. The functions of loading and shutting down the DACs and programming the logic can be combined in a single

command.

CONTROL DATA

FUNCTION

LSB

D1D2D3D4D5D6

MSB

LALBUB4SASBUB3UB2

UB1

X X 1

* *

0 0 0 X

X X X X X X

X No Operation to DAC Registers

Unassigned Command

Load Register to DAC B

Load Register to DAC A

Load Both DAC Registers

All DACs Active

Unassigned Command

Shutdown

ShutdownX

8-Bit DAC Data

LOADED LOADED

IN FIRST IN LAST

UB1

UB2

X X

UB3

UB4

Digital Inputs

The digital inputs are compatible with CMOS logic.

Supply current increases slightly when toggling the

logic inputs through the transition zone between

0.3

and 0.7

Microprocessor Interfacing

The MAX5223 serial interface is compatible with

MICROWIRE, SPI, and QSPI. For SPI, clear the CPOL

and CPHA bits (CPOL = 0 and CPHA = 0). CPOL = 0

sets the inactive clock state to zero, and CPHA = 0

changes data at the falling edge of SCLK. This setting

allows SPI to run at full clock speeds. If a serial port is

not available on your µP, three bits of a parallel port can

be used to emulate a serial port by bit manipulation.

Minimize digital feedthrough at the voltage outputs by

operating the serial clock only when necessary.

1 2 3 4 5 6 7 8 9 10 11

Serial DAC in 8-Pin SOT23 1

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Rainbow-electronics MAX5223 Manual de usuario Pagina 9

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