Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

ES51999 Datasheet(PDF) 12 Page - Cyrustek corporation

Part No. ES51999
Description  4 3/4 and 5 3/4 A/D AUTO
Download  21 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  CYRUSTEK [Cyrustek corporation]
Homepage  http://www.cyrustek.com.tw
Logo 

ES51999 Datasheet(HTML) 12 Page - Cyrustek corporation

Zoom Inzoom in Zoom Outzoom out
 12 / 21 page
background image
07/07/06
12
ES51999
4 3/4 and 5 3/4 A/D AUTO
DC/AC voltage measurement
A re-configurable voltage divider provides a suitable full-scale range voltage
measurement mode. The following table summarizes the full-scale ranges in each
configuration.
Configuration
Full Scale Range
Divider Ratio
Resister Connection
VR1
440.00mV
1
-
VR2
4.4000V
1/10
R2 / (R1+R2)
VR3
44.000V
1/100
R3 / (R1+R3)
VR3
440.00V
1/1000
R4 / (R1+R4)
VR5
4400.0V
1/10000
R5 / (R1+R5)
In configuration VR1, the full range is 440mV, and the voltage inputs from V400m pin to
prevent the influence of noise when floating. In other configurations, the voltage inputs
from VR1 pin.
Pin 19 to 23 are used for AC measurement. Figure 4.1 is the AC-to-DC circuit. AC-
to-DC circuit extracts the AC part of the voltage (ADO - TEST5). ADC then converts the
voltage of (ACVH – ACVL) to acquire the AC value of input voltage. Variable resistor
5K
Ω is used to adjust the DC offset. Light shielding for diode D1 and D2 is required to
prevent leakage current. This circuit works properly only when the input voltage is
sinusoidal. If the input is not sinusoidal (e.g., square waves), a true RMS-to-DC
converter chip will be needed to obtain the correct true RMS value of input signal.
If ADO and ADI short directly, ADI is the divided voltage of the input signal.
Therefore, it can be used for oscillator display.
Figure 4.1 AC-to-DC circuit
D1
15K
OVSG
OR1
VR5
VR4
VR3
VR2
V
R
1
100
1K
10K
101K
10M
ADO
ADI
ACVH
ACVL
V
R
88M
D2
0.1u
0.47u
10K
5K
15K
1u
1u
1.11M
-100mV
TEST5
Voltage input
AGND


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
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