Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

TC811CKW Folha de dados(PDF) 6 Page - TelCom Semiconductor, Inc

Nome de Peças TC811CKW
Descrição Electrónicos  3-1/2 DIGIT A/D CONVERTER WITH HOLD AND DIFFERENTIAL REFERENCE INPUTS
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  TELCOM [TelCom Semiconductor, Inc]
Página de início  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC811CKW Folha de dados(HTML) 6 Page - TelCom Semiconductor, Inc

Back Button TC811CKW Datasheet HTML 2Page - TelCom Semiconductor, Inc TC811CKW Datasheet HTML 3Page - TelCom Semiconductor, Inc TC811CKW Datasheet HTML 4Page - TelCom Semiconductor, Inc TC811CKW Datasheet HTML 5Page - TelCom Semiconductor, Inc TC811CKW Datasheet HTML 6Page - TelCom Semiconductor, Inc TC811CKW Datasheet HTML 7Page - TelCom Semiconductor, Inc TC811CKW Datasheet HTML 8Page - TelCom Semiconductor, Inc TC811CKW Datasheet HTML 9Page - TelCom Semiconductor, Inc TC811CKW Datasheet HTML 10Page - TelCom Semiconductor, Inc Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 12 page
background image
3-142
TELCOM SEMICONDUCTOR, INC.
3-1/2 DIGIT A/D CONVERTER WITH HOLD AND
DIFFERENTIAL REFERENCE INPUTS
TC811
Accuracy in a dual slope converter is unrelated to the
integrating resistor and capacitor values as long as they are
stable during a measurement cycle. An inherent benefit of
the dual slope technique is noise immunity. Noise spikes are
integrated or averaged to zero during the integration peri-
ods, making integration ADCs immune to the large conver-
sion errors that plague successive approximation convert-
ers in high noise environments. Interfering signals, with
frequency components at multiples of the averaging (inte-
grating) period, will be attenuated. (see Figure 3). Integrat-
ing ADCs commonly operate with the signal integration
period set to a multiple of the 50/60Hz power line period.
THEORY OF OPERATION
Analog Section
In addition to the basic integrate and deintegrate dual-
slope cycles discussed above, the TC811 design incorpo-
rates an “Integrator Output Zero” cycle and an “Auto Zero”
cycle. These additional cycles ensure the integrator starts at
0V (even after a severe overrange conversion) and that all
offset voltage errors (buffer amplifier, integrator and com-
parator) are removed from the conversion. A true digital zero
reading is assured without any external adjustments.
A complete conversion consists of four distinct phases:
(1) Integrator Output Zero Cycle
(2) Auto Zero Cycle
(3) Signal Integrate Cycle
(4) Reference Deintegrate Cycle
Figure 4a. Conversion Timing During Normal Operation
Figure 4b. Conversion Timing During Overrange Operation
during the measurement cycle. The Auto Zero cycle residual
is typically 10 to 15
µV.
The Auto Zero duration is from 910 to 2,900 counts for
non-over-range conversions and from 300 to 910 counts for
overrange conversions.
Signal Integration Cycle
Upon completion of the Auto Zero cycle, the Auto Zero
loop is opened and the internal differential inputs connect to
VIN+ and VIN–. The differential input signal is then integrated
for a fixed time period which, in the TC811 is 1000 counts
(4000 clock periods). The externally set clock frequency is
divided by four before clocking the internal counters. The
integration time period is:
TINT =
The differential input voltage must be within the device
common-mode range when the converter and measured
system share the same power supply common (ground).
Integrator Output Zero Cycle
This phase guarantees that the integrator output is at
zero volts before the system zero phase is entered, ensuring
that the true system offset voltages will be compensated for
even after an overrange conversion. The duration of this
phase is variable, being a function of the number of counts
(clock cycles) required for deintegration.
The Integrator Output Zero cycle will last from 11 to 140
counts for non-over-range conversions and from 31 to 640
counts for overrange conversions.
Auto Zero Cycle
During the Auto Zero cycle, the differential input signal
is disconnected from the measurement circuit by opening
internal analog switches and the internal nodes are shorted
to Analog Common (0V ref.) to establish a zero input
condition. Additional analog switches close a feedback loop
around the integrator and comparator to permit comparator
offset voltage error compensation. A voltage established on
CAZ then compensates for internal device offset voltages
4000
fOSC
INT
DE-INT
ZI
AZ
4000
910–2900
1–2000
1000
11–140
AZ
4000
ZI
DE-INT
INT
1000
2001–2090
31–640
300–910


Nº de peça semelhante - TC811CKW

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Microchip Technology
TC811CKW MICROCHIP-TC811CKW Datasheet
120Kb / 14P
   3-1/2 Digit Analog-To-Digital Converter with Hold and Differential Reference Inputs
2001
More results

Descrição semelhante - TC811CKW

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Analog Microelectronics
AME811 AME-AME811 Datasheet
905Kb / 15P
   3-1/2 Digit A/D Converter - Low Power With HOLD And Differential Reference Inputs
logo
Microchip Technology
TC811 MICROCHIP-TC811 Datasheet
120Kb / 14P
   3-1/2 Digit Analog-To-Digital Converter with Hold and Differential Reference Inputs
2001
logo
Maxim Integrated Produc...
ICL7117RCPL MAXIM-ICL7117RCPL Datasheet
197Kb / 4P
   31/2 Digit A/D Converter With Display Hold
Rev 0; 1985
logo
Microchip Technology
TC815 MICROCHIP-TC815 Datasheet
595Kb / 26P
   3-1/2 Digit Auto-Ranging A/D Converter with Triplex LCD Drive and Display Hold Function
2002
logo
List of Unclassifed Man...
LD110 ETC-LD110 Datasheet
335Kb / 8P
   3 1/2 Digit A/D Converter Set
logo
Maxim Integrated Produc...
ICL7116 MAXIM-ICL7116 Datasheet
193Kb / 4P
   3쩍 Digit A/D Converter With Display Hold
19-5038; Rev 0; 1985
logo
New Japan Radio
NJU9203B NJRC-NJU9203B Datasheet
200Kb / 4P
   3.1/2 DIGIT SINGLE CHIP A/D CONVERTER WITH DISPLAY HOLD
logo
Cyrustek corporation
ES5106 CYRUSTEK-ES5106_03 Datasheet
756Kb / 20P
   3 1/2 DIGIT A/D CONVERTER W/LCD
logo
List of Unclassifed Man...
ES5136 ETC1-ES5136 Datasheet
364Kb / 22P
   3 1/2 DIGIT A/D CONVERTER W/LCD
ES5107 ETC-ES5107 Datasheet
327Kb / 20P
   3 1/2 DIGIT A/D CONVERTER W/LED
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


Folha de dados Download

Go To PDF Page


Ligação URL




Privacy Policy
ALLDATASHEETPT.COM
ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   roca de Link   |   Lista de Fabricantes
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