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参数资料
型号： MCP4726A1T-E/MAY
厂商： Microchip Technology
文件页数： 65/86页
文件大小： 0K
描述： IC DAC 12BIT NV EEP I2C 6DFN
标准包装： 3,000
设置时间： 6µs
位数： 12
数据接口： EEPROM，I²C，串行
转换器数目： 1
电压电源： 单电源
功率耗散（最大）： 1.10W
工作温度： -40°C ~ 125°C
安装类型： 表面贴装
封装/外壳： 6-VDFN 裸露焊盘
供应商设备封装： 6-DFN（2x2）
包装： 带卷 (TR)
输出数目和类型： 1 电压，单极
采样率（每秒）： *
MCP4706/4716/4726
DS22272C-page 68
2011-2012 Microchip Technology Inc.
8.6
Designing a Double-Precision
DAC
Figure 8-7 shows an example design of a single-supply
voltage output capable of up to 24-bit resolution. This
requires two 12-bit DACs. This design is simply a
voltage divider with a buffered output.
As an example, if a similar application to the one
developed in Section 8.5.1 “Bipolar DAC Example
Using MCP4726” required a resolution of 1 V instead
of 1 mV, and a range of 0V to 4.1V, then 12-bit
resolution would not be adequate.
Step 1: Calculate the resolution needed:
4.1V/1 V = 4.1 x 106.
Since
222 =4.2 x106,
22-bit
resolution
is
desired.
Since
DNL = ±0.75 LSb, this design can be attempted
with the 12-bit DAC.
Step 2: Since DACB’s VOUTB has a resolution of 1 mV,
its output only needs to be “pulled” 1/1000 to meet
the 1 V target. Dividing VOUTA by 1000 would
allow the application to compensate for DACB’s
DNL error.
Step 3: If R2 is 100Ω, then R1 needs to be 100 kΩ.
Step 4: The resulting transfer function is shown in the
equation of Example 8-6.
FIGURE 8-7:
Simple Double Precision
DAC using MCP4726.
EQUATION 8-6:
VOUT CALCULATION
8.7
Building Programmable Current
Source
Figure 8-8
shows
an
example
of
building
a
programmable current source using a voltage follower.
The current sensor resistor is used to convert the DAC
voltage output into a digitally-selectable current source.
The smaller RSENSE is, the less power dissipated
across it. However, this also reduces the resolution that
the current can be controlled.
FIGURE 8-8:
Digitally-Controlled Current
Source.
R1
VCC+
VCC–
VOUT
I2C
2-wire
VREF
Optional
MCP4726 (A)
VDD
I2C
2-wire
VREF
Optional
MCP4726 (B)
VDD
R2
0.1 F
VOA
VOB
VOUT =
G = Selected Op Amp Gain
VOA * R2 + VOB * R1
R1 + R2
VOA = (VREF * G * DAC A Register Value)/4096
VOB = (VREF * G * DAC B Register Value)/4096
Where:
RSENSE
Ib
Load
IL
VCC+
VCC–
VOUT
I
L
V
OUT
R
se ns e
---------------
β
β 1
+
-------------
×
=
I
b
I
L
β
----
=
β = Common-Emitter Current Gain.
where
VDD
I2C
2-wire
VREF
Optional
MCP47X6
VDD
(or VREF)
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