參數(shù)資料
型號： 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)： 32/50頁
文件大?。?/td> 1494K
代理商： MCP4725A1T-E/CH
MCP4725
DS22039D-page 38
2009 Microchip Technology Inc.
8.5.4.1
Design a Bipolar DAC using
Some applications desires an output step magnitude of
1 mV with an output range of ±2.05V. The following
steps explain the design solution:
1.
Calculate the range: +2.05V – (-2.05V) = 4.1V.
2.
Calculate the resolution needed:
4.1V/1 mV = 4100 steps
Note that 212 = 4096 for 12-bit resolution.
3.
The amplifier gain (R2/R1), multiplied by VDD,
must be equal to the desired minimum output to
achieve bipolar operation. Since any gain can
be realized by choosing resistor values (R1+R2),
the VDD value must be selected first. If a VDD of
4.1V is used, solve for the amplifier’s gain by
setting the DAC code to 0, knowing that the out-
put needs to be -2.05V. The equation can be
simplified to
:
4.
Next, solve for R3 and R4 by setting the DAC to
4096, knowing that the output needs to be
+2.05V.
R
2
–
R
1
---------
2.05
–
V
DD
-------------
2.05
–
4.1
-------------
=
R
2
R
1
------
1
2
---
=
→
If R1 = 20 k and R2 = 10 k, the gain will be 0.5.
R
4
R
3
R
4
+
()
------------------------
2.05V
0.5 V
DD
()
+
1.5 V
DD
-------------------------------------------------
2
3
---
==
If R4 = 20 k, then R3 = 10 k
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