MAX522CSA Ver la hoja de datos (PDF) - Maxim Integrated

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MAX522CSA

Dual, 8-Bit, Voltage-Output Serial DAC in 8-Pin SO Package

Maxim Integrated 

Dual, 8-Bit, Voltage-Output

Serial DAC in 8-Pin SO Package

CS

SCLK

DIN

tCSS

tCH

tDS

tCL

tDH

tCSPWH

tCSH

Figure 3. MAX522 Detailed Serial-Interface Timing Diagram

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)(VDD) and (0.7)(VDD).

Microprocessor Interfacing

The MAX522 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 (0.5MHz). 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.

Table 4. Code Table

DAC CONTENTS

B7 B6 B5 B4 B3 B2 B1 B0

ANALOG

OUTPUT

11111111

+REF

×



255

256



1 0 0 0 0 0 0 1 +REF × 122596 

10000000

+REF

×

 128

 256

=

+ REF

2

0 1 1 1 1 1 1 1 +REF × 122576 

00000001

00000000

+REF

×



1

256



0V

Note:

1LSB =

REF × 2−8

=

REF

×

 1

 256 

ANALOG OUTPUT

=

REF

×

D

 256 

where D = Decimal

Value of Digital Input

10 ______________________________________________________________________________________

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