データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

TC514CJE データシート(PDF) 7 Page - Microchip Technology

部品番号 TC514CJE
部品情報  Precision Analog Front Ends
Download  34 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC514CJE データシート(HTML) 7 Page - Microchip Technology

Back Button TC514CJE Datasheet HTML 3Page - Microchip Technology TC514CJE Datasheet HTML 4Page - Microchip Technology TC514CJE Datasheet HTML 5Page - Microchip Technology TC514CJE Datasheet HTML 6Page - Microchip Technology TC514CJE Datasheet HTML 7Page - Microchip Technology TC514CJE Datasheet HTML 8Page - Microchip Technology TC514CJE Datasheet HTML 9Page - Microchip Technology TC514CJE Datasheet HTML 10Page - Microchip Technology TC514CJE Datasheet HTML 11Page - Microchip Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 34 page
background image
© 2006 Microchip Technology Inc.
DS21428D-page 7
TC500/A/510/514
4.0
DETAILED DESCRIPTION
4.1
Dual Slope Conversion Principles
Actual data conversion is accomplished in two
phases: input signal integration and reference voltage
de-integration.
The integrator output is initialized to 0V prior to the start
of integration. During integration, analog switch S1 con-
nects VIN to the integrator input where it is maintained
for a fixed time period (TINT). The application of VIN
causes the integrator output to depart 0V at a rate deter-
mined by the magnitude of VIN and a direction deter-
mined by the polarity of VIN. The de-integration phase is
initiated immediately at the expiration of TINT.
During de-integration, S1 connects a reference voltage
(having a polarity opposite that of VIN) to the integrator
input. At the same time, an external precision timer is
started. The de-integration phase is maintained until
the comparator output changes state, indicating the
integrator has returned to its starting point of 0V. When
this occurs, the precision timer is stopped. The de-
integration time period (TDEINT), as measured by the
precision timer, is directly proportional to the magnitude
of the applied input voltage (see Figure 4-3).
A simple mathematical equation relates the input
signal, reference voltage and integration time:
EQUATION 4-1:
For a constant VIN:
EQUATION 4-2:
The dual slope converter accuracy is unrelated to the
integrating resistor and capacitor values as long as
they are stable during a measurement cycle.
An inherent benefit is noise immunity. Input noise
spikes are integrated (averaged to zero) during the
integration periods. Integrating ADCs are immune to
the large conversion errors that plague successive
approximation converters in high noise environments.
Integrating converters provide inherent noise rejection
with
at
least
a
20dB/decade
attenuation
rate.
Interference signals with frequencies at integral
multiples of the integration period are, theoretically,
completely removed, since the average value of a sine
wave of frequency (1/T) averaged over a period (T) is
zero.
Integrating converters often establish the integration
period to reject 50/60 Hz line frequency interference
signals. The ability to reject such signals is shown by a
normal mode rejection plot (Figure 4-1). Normal mode
rejection is limited in practice to 50 to 65 dB, since the
line frequency can deviate by a few tenths of a percent
(Figure 4-2).
FIGURE 4-1:
Integrating Converter
Normal Mode Rejection.
FIGURE 4-2:
Line Frequency Deviation.
Where:
VREF = Reference Voltage
TINT = Signal Integration time (fixed)
tDEINT = Reference Voltage Integration time (variable)
1
R
INTCINT
------------------------
V
IN T
()DT
0
T
INT
V
REFCDEIN T
R
INTCINT
--------------------------------
=
V
IN
V
REF
T
DEINT
T
INT
------------------
=
30
20
10
0
0.1/T
1/T
10/T
Input Frequency
T = Measurment
Period
0.01
0.1
1.0
80
70
60
50
40
30
20
t = 0.1 sec
Line Frequency Deviation from 60 Hz (%)
Normal Mode
REJECTION
= 20 LOG
DEV = Deviation from 60 Hz
t = Integration Period
SIN 60
t (1 ±
)
p
p
DEV
100
DEV
100
60
t (1 ±
)


同様の部品番号 - TC514CJE

メーカー部品番号データシート部品情報
logo
Microchip Technology
TC514CJE MICROCHIP-TC514CJE Datasheet
588Kb / 38P
   Precision Analog Front Ends with Dual Slope ADC
2008
More results

同様の説明 - TC514CJE

メーカー部品番号データシート部品情報
logo
Microchip Technology
TC500 MICROCHIP-TC500 Datasheet
565Kb / 28P
   Precision Analog Front Ends
2002
logo
TelCom Semiconductor, I...
TC500 TELCOM-TC500 Datasheet
209Kb / 17P
   PRECISION ANALOG FRONT ENDS
logo
Microchip Technology
TC500 MICROCHIP-TC500_08 Datasheet
588Kb / 38P
   Precision Analog Front Ends with Dual Slope ADC
2008
logo
Analog Devices
AD1018 AD-AD1018 Datasheet
72Kb / 2P
   High Precision Analog Front End
AD8450 AD-AD8450_17 Datasheet
1Mb / 42P
   Precision Analog Front End and Controller
AD8452 AD-AD8452 Datasheet
743Kb / 35P
   Precision Integrated Analog Front End, Controller
ADPD105 AD-ADPD105 Datasheet
884Kb / 66P
   Photometric Front Ends
ADPD1080 AD-ADPD1080 Datasheet
1Mb / 74P
   Photometric Front Ends
AD1030 AD-AD1030 Datasheet
78Kb / 2P
   High Precision Analog Front End with TEC/PMIC
Rev. Sp0
logo
STMicroelectronics
TDA7521 STMICROELECTRONICS-TDA7521 Datasheet
95Kb / 11P
   Analog Front End
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com