參數(shù)資料
型號: MCP4725A2T-E/CH
廠商: Microchip Technology
文件頁數(shù): 29/50頁
文件大?。?/td> 0K
描述: IC DAC 12BIT EE W/I2C SOT23-6
標準包裝: 1
設(shè)置時間: 6µs
位數(shù): 12
數(shù)據(jù)接口: EEPROM,I²C,串行
轉(zhuǎn)換器數(shù)目: 1
電壓電源: 單電源
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: SOT-23-6
供應(yīng)商設(shè)備封裝: SOT-23-6
包裝: 標準包裝
輸出數(shù)目和類型: 1 電壓,單極;1 電壓,雙極
采樣率(每秒): *
產(chǎn)品目錄頁面: 673 (CN2011-ZH PDF)
配用: MCP4725DM-PTPLS-ND - BOARD DAUGHTER PICTAIL MCP4725
其它名稱: MCP4725A2T-E/CHDKR
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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