- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄17099 > ADM00317 (Microchip Technology)BOARD DAUGHTER MCP4706/16/26 PDF資料下載
參數(shù)資料
| 型號： | ADM00317 |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 65/86頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DAUGHTER MCP4706/16/26 |
| 標(biāo)準包裝： | 1 |
| DAC 的數(shù)量： | 3 個，每 IC 1 個 |
| 位數(shù)： | 8，10，12 |
| 設(shè)置時間： | 6µs |
| DAC 型： | 電壓 |
| 已供物品： | 子板 |
| 已用 IC / 零件： | MCP4706，MCP4716，MCP4726 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁當(dāng)前第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁
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
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)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SLP471M200E1P3 | CAP ALUM 470UF 200V 20% SNAP |
| PCX1H330MCL1GS | CAP ALUM 33UF 50V 20% SMD |
| R-725.0D | CONV DC/DC 2A 6.5-28VIN 5V |
| SLPX391M250A5P3 | CAP ALUM 390UF 250V 20% SNAP |
| RBM12DCBD | CONN EDGECARD 24POS R/A .156 SLD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM00333 | 功能描述:開發(fā)板和工具包 - PIC / DSPIC PIC18F87J72 Evaluation Board RoHS:否 制造商:Microchip Technology 產(chǎn)品:Starter Kits 工具用于評估:chipKIT 核心:Uno32 接口類型: 工作電源電壓: |
| ADM00344 | 功能描述:電源管理IC開發(fā)工具 RE46C190 Demo Board RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| ADM00345 | 功能描述:電源管理IC開發(fā)工具 3-Phase BLDC Snsrlss Fan Cntrllr RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| ADM00352 | 功能描述:電源管理IC開發(fā)工具 MCP16301 600mA Demo Board RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| ADM00360 | 功能描述:電源管理IC開發(fā)工具 MCP16301 300mA D2PAK Footprint Demo Board RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。