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MCP4728 Datasheet(PDF) 56 Page - Microchip Technology

Part # MCP4728
Description  12-Bit, Quad Digital-to-Analog Converter with EEPROM Memory
PDF  66 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP4728 Datasheet(HTML) 56 Page - Microchip Technology

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MCP4728
DS22187C-page 56
© 2009 Microchip Technology Inc.
FIGURE 7-5:
Example of Writing Fast Write Command for Various VOUT. VREF = VDD for all
Channels.
1st Byte
2nd Byte
DAC A
Start
3rd Byte
Stop
S 1 1 0 0A2 A1 A00 A 011 A2 A1 A0 01 A 0 1 1 A2 A1 A0 1 0 A
. . . . . . .
P
Address Byte
Write Command
Fast Mode
Next DAC Channels
V
OUT
V
REF
D
n
×
()
4096
---------------------------------- G
x
=
V
OUT
A
V
DD
4095
×
()
4096
------------------------------------V
DD
4096
1
–
4096
---------------------
⎝⎠
⎛⎞
V
DD
1
1
4096
------------
–
⎝⎠
⎛⎞
V
DD
LSB
–
=
=
=
=
Dn for Channel A = 0FFF (hex) = 4095 (decimal)
(A) Channel A Output:
(B) Channel B Output:
Dn for Channel B = 07FF (hex) = 2047 (decimal)
V
OUT
B
V
DD
2047
×
()
4096
------------------------------------V
DD
2048
1
–
4096
---------------------
⎝⎠
⎛⎞
V
DD
2
-------------1
2
4096
------------
–
⎝⎠
⎛⎞
V
DD
2
-------------LSB
–
=
=
=
=
(C) Channel C Output:
Dn for Channel C = 03FF (hex) = 1023 (decimal)
V
OUT
C
V
DD
1023
×
4096
----------------------------------
V
DD
1024
1
–
4096
---------------------
⎝⎠
⎛⎞
V
DD
4
-------------1
4
4096
------------
–
⎝⎠
⎛⎞
V
DD
4
-------------LSB
–
=
=
=
=
(D) Channel D Output:
Dn for Channel D = 01FF (hex) = 511 (decimal)
V
OUT
D
V
DD
511
×
4096
-------------------------------
V
DD
512
1
–
4096
------------------
⎝⎠
⎛⎞
V
DD
8
-------------1
8
4096
------------
–
⎝⎠
⎛⎞
V
DD
8
-------------LSB
–
=
=
=
=
DAC A Input Code = 001111-11111111
DAC B Input Code = 000111-11111111
DAC C Input Code = 000011-11111111
DAC D Input Code = 000001-11111111
The following example shows the expected analog outputs with the corresponding DAC input codes:



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