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MCP4725 датащи(PDF) 36 Page - Microchip Technology

номер детали MCP4725
подробное описание детали  12-Bit Digital-to-Analog Converter with EEPROM Memory
PDF  56 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP4725 датащи(HTML) 36 Page - Microchip Technology

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MCP4725
DS20002039E-page 36
 2007-2022 Microchip Technology Inc. and its subsidiaries
8.5.3
BUILDING A “WINDOW” DAC
Some sensor applications require very high resolution
around the set point or threshold voltage.
Example 8-2 shows an example of creating a “window”
around the threshold using a voltage divider network
with a pull-up and pull-down resistor. In the circuit, the
output voltage range is scaled down, but its step
resolution is increased greatly.
EXAMPLE 8-2:
Single-Supply “Window” DAC.
VTRIP
R1
R2
0.1 µF
Comparator
R3
VCC-
Where: Dn = DAC Input Code (0 – 4095)
VCC+
VCC+
VCC-
VOUT
VOUT
VDD
Dn
2
12
-------
=
R23
R2R3
R2 R3
+
-------------------
=
V23
VCC+R2

VCC-R3

+
R2 R3
+
------------------------------------------------------
=
Vtrip
VOUTR23 V23R1
+
R2 R23
+
---------------------------------------------
=
R1
R23
V23
VOUT
VO
Thevenin
Equivalent
Rsense
To MCU
(MASTER)
R R
MCP4725
VDD
VOUT A0
SCL
VSS
1
2
3
4
5
6
VDD SDA
10 µF
0.1 µF
VDD



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