MCP4725 datasheet(29/42 Pages) MICROCHIP

Numer części	MCP4725

Szczegółowy opis	12-Bit Digital-to-Analog Converter with EEPROM Memory in SOT-23-6

PDF	42 Pages

Scroll/Zoom	100%

Producent	MICROCHIP [Microchip Technology]

Strona internetowa	http://www.microchip.com

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29 / 42 page

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

0.1 µF

VTRIP

RSENSE

MCP4725

VDD

VOUT

SCL

VSS

VDD

SDA

10 µF

0.1 µF

VDD

Input Code (0 to 4095)

OUT

4096

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

TRIP

OUT

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

⎝⎠

⎛⎞

Light

(Ceramic) (Tantalum)

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