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MCP4725 датащи(PDF) 29 Page - Microchip Technology

номер детали MCP4725
подробное описание детали  12-Bit Digital-to-Analog Converter with EEPROM Memory in SOT-23-6
PDF  42 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP4725 датащи(HTML) 29 Page - Microchip Technology

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© 2007 Microchip Technology Inc.
DS22039C-page 29
MCP4725
8.5.2
DECREASING THE OUTPUT STEP
SIZE
Calibrating the threshold of a diode, transistor or
resistor may require a very small step size in the DAC
output voltage. These applications may require about
200 µV of step resolution within 0.8V of range.
One method of achieving this small step resolution is
using a voltage divider at the DAC output. An example
is shown in Example 8-1. The step size of the DAC out-
put is scaled down by the factor of the ratio of the volt-
age divider. Note that the bypass capacitor on the
output of the voltage divider plays a critical function in
attenuating the output noise of the DAC and the
induced noise from the environment.
EXAMPLE 8-1:
Set Point Or Threshold Calibration.
To MCU
(MASTER)
R R
VDD
Comparator
R1
R2
0.1 µF
VTRIP
RSENSE
MCP4725
VDD
VOUT
A0
SCL
VSS
1
2
3
4
5
6
VDD
SDA
10 µF
0.1 µF
VDD
D
Input Code (0 to 4095)
=
V
OUT
V
DD
D
4096
------------
×
=
V
TRIP
V
OUT
R
2
R
1
R
2
+
-------------------
⎝⎠
⎛⎞
=
Light
(Ceramic) (Tantalum)



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