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參數資料
| 型號： | QT301 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | CAPACITANCE TO ANALOG CONVERTER |
| 中文描述： | 電容模擬轉換器 |
| 文件頁數： | 1/10頁 |
| 文件大小： | 247K |
| 代理商： | QT301 |
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P
RELIMINARY
QT301
C
APACITANCE
TO
A
NALOG
C
ONVERTER
Capacitance to Analog Converter (CAC) IC
Patented charge-transfer conversion method
Sub-ranging Direct-to-Analog conversion
Rescaleable PWM: wide dynamic range
End-to-end calibration (gain, span) via CAL pins
100 kHz PWM
Spread spectrum acquisition bursts for low noise
Sample on demand via Sync pin
Only one external sample capacitor
APPLICATIONS
Material sensors
Position sensing
Proximity sensors
Transducer driver
Moisture detection
Fluid level sensors
The QT301 charge-transfer (QT) IC is a self-contained Capacitance-to-Analog-Converter (CAC) capable of detecting
femotofarad level changes in capacitance. This part is designed primarily for stand-alone instrumentation applications.
Primary applications include fluid level sensors, distance sensors, material detectors, transducer amplifiers for pressure and
humidity sensing functions, and other uses requiring quantified capacitance data.
Unlike other Quantum products, the QT301 does not process its acquired data. Its only output is raw, unprocessed data in
filterable PWM form that can be translated into an analog voltage by a simple RC network. This allows the designer to treat
the device as a CAC for measurement applications.
The PWM range is set via two inputs that control the starting and ending point of the conversion range. For example, if the
capacitance range of Cx is from 27pF to 38pF, the QT301 can be calibrated so that the PWM zero point occurs at 27pF, and
the endpoint (255) occurs at 38pF. In this way, the PWM range is optimized for the zone of interest. These calibration points
are stored in internal EEPROM and do not have to be reacquired after a power reset. This means that the resolution of the
part can be compared easily to other methods that might otherwise require 12 or more bits of overall resolution.
The device operates on demand via a sync input pin. The sync input can also be used to avoid external noise sources and
cross-interference from adjacent QRG capacitive sensors. Unique among capacitance sensors, this device features
spread-spectrum burst modulation, permitting extremely high noise rejection characteristics for very robust signals even in
high EMI environments.
The device requires only a single sampling capacitor (Cs) to acquire signals. The value of this capacitor controls the gain of
the sensor, and it can be adjusted over 2 decades of range from 1nF to 500nF. No external switches, opamps, or other
components are required.
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Copyright 2003 QRG Ltd
QT301 R1.04 21/09/03
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QT301-IS
-40
0
C to +85
0
C
QT301-D
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0
0
C to +70
0
C
8-PIN DIP
SOIC
T
A
AVAILABLE OPTIONS
CAL_DN
VDD
PWM
SNS2
VSS
SNS1
CAL_UP
SYNC
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相關代理商/技術參數 |
參數描述 |
|---|---|
| QT301-D | 功能描述:SENSOR IC CAC ANALOG OUT 8-DIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數據接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| QT301-IS | 功能描述:SENSOR IC CAC ANALOG OUT 8-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數據接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| QT310 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PROGRAMMABLE CAPACITANCE SENSOR IC |
| QT310-D | 制造商:Quantum Corp 功能描述:IC TOUCH SENSOR 1CH DIP8 310 |
| QT310-IS | 功能描述:SENSOR IC TOUCH PROG 1CH 8-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 觸摸屏控制器 系列:QProx™ 標準包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數/鍵:- 分辨率（位）:- 評估套件:* 數據接口:- 數據速率/采樣率 (SPS，BPS):- 電壓基準:- 電源電壓:- 電流 - 電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
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