參數(shù)資料
型號(hào)： MCP4725A1T-E/CH
元件分類： DAC
英文描述： SERIAL INPUT LOADING, 6 us SETTLING TIME, 12-BIT DAC, PDSO6
封裝： PLASTIC, SOT-23, 6 PIN
文件頁數(shù)： 29/50頁
文件大?。?/td> 1494K
代理商： MCP4725A1T-E/CH
2009 Microchip Technology Inc.
DS22039D-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 V 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
R1
R2
0.1 F
VTRIP
RSENSE
MCP4725
VDD
VOUT A0
SCL
VSS
1
2
3
4
5
6
VDD SDA
10 F
0.1 F
VDD
Dn
Input Code (0 to 4095)
=
V
OUT
V
DD
Dn
4096
------------
×
=
V
TRIP
V
OUT
R
2
R
1
R
2
+
-------------------
=
Light
(Ceramic) (Tantalum)
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