参数资料
型号: MCP4725EV
厂商: Microchip Technology
文件页数: 29/50页
文件大小: 0K
描述: BOARD EVAL FOR MCP4725
标准包装: 1
DAC 的数量: 1
位数: 12
采样率(每秒): 100k ~ 3.4M
数据接口: I²C
设置时间: 6µs
DAC 型: 电压
工作温度: -40°C ~ 125°C
已供物品: 2 板,CD
已用 IC / 零件: MCP4725
产品目录页面: 673 (CN2011-ZH PDF)
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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