MCP4728 datasheet(24/50 Pages) MICROCHIP

24 / 50 page

MCP4728 Evaluation Board User’s Guide

DS51837A-page 20

FIGURE 1-13:

VOUT for Example 3: Fast Write Command for Various VOUT. VREF = VDD and

Gain = 1 for All Channels.

OUT

REF

()

4096

-------------------------------G

OUT A

4095

()

4096

----------------------------------

4096

–

4096

---------------------

⎝⎠

⎛⎞

DD 1

4096

------------

–

⎝⎠

⎛⎞

LSB

–

Next DAC Channels

Fast Mode Write Command

In Script file, Dn for Channel A = 0FFF (hex) = 4095 (decimal)

(A) Channel A Output:

(B) Channel B Output:

In Script file, Dn for Channel B = 07FF (hex) = 2047 (decimal)

OUT B

2047

()

4096

----------------------------------

2048

–

4096

---------------------

⎝⎠

⎛⎞

----------- 1

4096

------------

–

⎝⎠

⎛⎞

-----------LSB

–

In Script file, Dn for Channel C = 03FF (hex) = 1023 (decimal)

OUT C

1023

4096

--------------------------------

1024

–

4096

---------------------

⎝⎠

⎛⎞

----------- 1

4096

------------

–

⎝⎠

⎛⎞

-----------LSB

–

(D) Channel D Output:

In Script file, Dn for Channel D = 01FF (hex) = 511 (decimal)

OUT D

511

4096

-----------------------------

512

–

4096

------------------

⎝⎠

⎛⎞

----------- 1

4096

------------

–

⎝⎠

⎛⎞

-----------LSB

–

DAC Input Data of Channel A = 001111-11111111

DAC A

DAC Input Data of Channel B = 000111-11111111

DAC Input Data of Channel C = 000011-11111111

DAC Input Data of Channel D = 000001-11111111

The following example shows when the device receives the Fast Write command

with the following data:

Start

Stop

0 A

D11

D10

Address Byte

2nd Byte

3rd Byte

1st Byte

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