MCP4728 Microchip Technology Inc., MCP4728 Datasheet - Page 56
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MCP4728
Manufacturer Part Number
MCP4728
Description
12-bit, Quad Digital-to-analog Converter With Eeprom Memory
Manufacturer
Microchip Technology Inc.
Datasheet
1.MCP4728.pdf
(66 pages)
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MCP4728
FIGURE 7-5:
Channels.
DS22187A-page 56
Start
S 1 1 0 0 A2 A1 A0 0 A 0 1 1 A2 A1 A0 0 1 A 0 1 1 A2 A1 A0 1 0 A
The following example shows the expected analog outputs with the corresponding DAC input codes:
(C) Channel C Output:
Address Byte
(A) Channel A Output:
(B) Channel B Output:
(D) Channel D Output:
1st Byte
DAC A Input Code =
DAC B Input Code =
DAC C Input Code =
DAC D Input Code =
Example of Writing Fast Write Command for Various V
Dn for Channel B = 07FF (hex) = 2047 (decimal)
Dn for Channel A = 0FFF (hex) = 4095 (decimal)
Dn for Channel C = 03FF (hex) = 1023 (decimal)
Dn for Channel D = 01FF (hex) = 511 (decimal)
V OUT
V OUT A
V OUT B
V OUT C
V OUT D
=
(
--------------------------------- - G x
V REF
=
=
Write Command
=
=
4096
(
----------------------------------- -
(
----------------------------------- -
Fast Mode
V DD
V DD
V DD
----------------------------------
V DD 511
-------------------------------
×
001111-11111111
000111-11111111
000011-11111111
000001-11111111
4096
4096
D n
4096
4096
×
×
×
×
)
4095
1023
2047
2nd Byte
)
)
=
=
=
=
V DD
V DD
V DD
V DD
⎛
⎝
⎛
⎝
⎛
⎝
⎛
⎝
4096 1
-------------------- -
512 1
----------------- -
2048 1
-------------------- -
1024 1
-------------------- -
4096
4096
4096
4096
–
–
–
–
DAC A
⎞
⎠
⎞
⎠
⎞
⎠
=
⎞
⎠
=
=
=
V DD
------------ - 1
V DD 1
V DD
------------ - 1
V DD
------------ - 1
8
2
4
⎛
⎝
3rd Byte
⎛
⎝
⎛
⎝
⎛
⎝
–
Next DAC Channels
–
–
–
----------- -
4096
----------- -
4096
----------- -
4096
----------- -
4096
8
1
2
4
⎞
⎠
⎞
⎠
⎞
⎠
=
⎞
⎠
=
=
=
OUT
V DD
------------ -
V DD
V DD
------------ -
V DD
------------ -
8
2
© 2009 Microchip Technology Inc.
4
. V
–
–
–
REF
–
LSB
LSB
LSB
LSB
. . . . . . .
= V
DD
for all
Stop
P