參數(shù)資料
型號(hào)： MCP3221DM-PCTL
廠商： Microchip Technology
文件頁(yè)數(shù)： 5/28頁(yè)
文件大小： 0K
描述： BOARD DEMO FOR PICTAIL MCP3221
標(biāo)準(zhǔn)包裝： 1
系列： PICtail™
ADC 的數(shù)量： 1
位數(shù)： 12
采樣率（每秒）： 22.3k
數(shù)據(jù)接口： 串行
工作溫度： -40°C ~ 85°C
已用 IC / 零件： MCP3221
已供物品： 板，纜線，CD
2006 Microchip Technology Inc.
DS21732C-page 13
MCP3221
4.0
DEVICE OPERATION
The MCP3221 employs a classic SAR architecture.
This architecture uses an internal sample and hold
capacitor to store the analog input while the conversion
is taking place. At the end of the acquisition time, the
input switch of the converter opens and the device uses
the collected charge on the internal sample-and-hold
capacitor to produce a serial 12-bit digital output code.
The acquisition time and conversion is self-timed using
an internal clock. After each conversion, the results are
stored in a 12-bit register that can be read at any time.
Communication with the device is accomplished with a
2-wire, I2C interface. Maximum sample rates of
22.3 ksps are possible with the MCP3221 in a continu-
ous-conversion mode and an SCL clock rate of
400 kHz.
4.1
Digital Output Code
The digital output code produced by the MCP3221 is a
function of the input signal and power supply voltage,
VDD. As the VDD level is reduced, the LSB size is
reduced accordingly. The theoretical LSB size is shown
below.
EQUATION
The output code of the MCP3221 is transmitted serially
with MSB first. The format of the code is straight binary.
4.2
Conversion Time (tCONV)
The conversion time is the time required to obtain the
digital result once the analog input is disconnected
from the holding capacitor. With the MCP3221, the
specified conversion time is typically 8.96 s. This time
is dependent on the internal oscillator and is
independent of SCL.
4.3
Acquisition Time (tACQ)
The acquisition time is the amount of time the sample
cap array is acquiring charge.
The acquisition time is, typically, 1.12 s. This time is
dependent on the internal oscillator and independent of
SCL.
4.4
Sample Rate
Sample rate is the inverse of the maximum amount of
time that is required from the point of acquisition of the
first conversion to the point of acquisition of the second
conversion.
The sample rate can be measured either by single or
continuous conversions. A single conversion includes
a Start Bit, Address Byte, Two Data Bytes and a Stop
bit. This sample rate is measured from one Start Bit to
the next Start Bit.
For continuous conversions (requested by the Master
by issuing an acknowledge after a conversion), the
maximum sample rate is measured from conversion to
conversion or a total of 18 clocks (two data bytes and
two Acknowledge bits). Refer to Section 5.2 “Device
Addressing”, “Device Addressing”.
FIGURE 4-1:
Transfer Function.
LSB SIZE
VDD
4096
------------
=
VDD = Supply voltage
1111 1111 1111
(4095)
1111 1111 1110
(4094)
AIN
0000 0000 0001 (1)
0000 0000 0011 (3)
Output Code
VDD-1.5 LSB
.5 LSB
1.5 LSB
VDD-2.5 LSB
2.5 LSB
0000 0000 0000 (0)
0000 0000 0010 (2)
相關(guān)PDF資料
PDF描述
LGU2D271MELZ CAP ALUM 270UF 200V 20% SNAP
SCRH5D28-101 INDUCTOR SMD 100UH 0.40A 10KHZ
STD24W-S WIRE & CABLE MARKERS
RBM10DTAH-S189 CONN EDGECARD 20POS R/A .156 SLD
EBM28DRKH-S13 CONN EDGECARD 56POS .156 EXTEND
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP3221-EVM 制造商:P&S 功能描述:An Evaluation Board, RS232 Serial Cable, and A CD-ROM of Demonstration Program on PC and Related Sources 制造商:P&S 功能描述:An Evaluation Board,RS232 Serial Cable,and A CD-ROM of Demonstration Program on PC and Related Sources
MCP3221T 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Low Power 12-Bit A/D Converter With I2C⑩ Interface
MCP3301 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Matched Microchannel Plate Set
MCP3301_07 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:13-Bit Differential Input, Low Power A/D Converter with SPI⑩ Serial Interface
MCP3301_11 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:13-Bit Differential Input, Low Power A/D Converter with SPI Serial Interface
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*