MCP4725 datasheet(35/56 Pages) MICROCHIP

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DS20002039E-page 35

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

output is scaled down by the factor of the ratio of the

voltage 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 A0

SCL

VSS

VDD SDA

10 µF

0.1 µF

VDD

Input Code (0 to 4095)

VOUT

VDD

4096

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



VTRIP

VOUT

R1 R2

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





Light

(Ceramic) (Tantalum)

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