MCP4725 Microchip Technology, MCP4725 Datasheet - Page 33

• Manufacturer Part Number: MCP4725
• Description: 12-Bit Digital-to-Analog Converter
• Manufacturer: Microchip Technology

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8.5.5
Example 8-3
DAC voltage output to a digitally selectable current
source by adding a voltage follower and a sensor
register.
FIGURE 8-3:
© 2007 Microchip Technology Inc.
V
OUT
PROGRAMMABLE CURRENT
SOURCE
1
2
3
illustrates an example how to convert the
V
V
V
0.1 µF
MCP4725
OUT
SS
DD
SCL
SDA
Digitally Controllable Current Source.
A0
10 µF
6
5
4
V
DD
R
SENSE
I
B
R R
LOAD
V
V
DD
DD
I
L
(MASTER)
To MCU
V
OUT
I
I
D
L
B
=
=
=
=
V
Input Code (0 to 4095)
------------------
R
I
----
β
V
L
SENSE
DD
OUT
×
----------- -
4096
----------- -
β
D
β
+
1
MCP4725
DS22039C-page 33