Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Anyone can help me in ADC? Pls...pls..

Status
Not open for further replies.

shteo83

Newbie level 5
Joined
Dec 15, 2005
Messages
10
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,369
I going to use ADC in my digital oscilloscope project but i confuse about the input of ADC. Actually how much the voltage that i can measure, i mean the voltage can enter the ADC. I knew something like Vref = -5v to +5v. But if i want to measure 100v signal, how can i make it? My ADC specification is ADC831, 8 bits, 80MSPS.
 

Moof

Full Member level 2
Joined
Nov 21, 2003
Messages
149
Helped
7
Reputation
14
Reaction score
1
Trophy points
1,298
Location
Argentina
Activity points
1,230
You have to make an atenuator, like analog osciloscopes. You can make an RC atenuator or just Resistive atenuator.
 

shameem

Member level 5
Joined
Oct 27, 2005
Messages
92
Helped
5
Reputation
10
Reaction score
3
Trophy points
1,288
Activity points
2,042
hi,
I think you should scale down your signal by 10 or 15 to get better resolution from the ADC. Like if you want to measure 100V scale down it to 10V. Then set your reference voltage to 5V. The value 7FFF output by ADC will correspond to 0V.The voltages measured above than 7FFF will be positive and the voltages lower than 7FFF will be negative.
Enjoy........
 

IanP

Advanced Member level 5
Joined
Oct 5, 2004
Messages
7,942
Helped
2,309
Reputation
4,620
Reaction score
531
Trophy points
1,393
Location
West Coast
Activity points
66,459
You will need Adjustable Attenuator (like in standard oscilloscopes) and/or a DC-XXMHz amplifier ..
Please find below examples of both devices ..
Regards,
IanP
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top