Measuring AC 220V with ADC0804

Hello friends,
I want to show AC voltages upto 250V on LCD using ADC 0804. I am planning to do this as- Step down xformer ---> bridge rectifier ----> ADC0804 ----> 8051 ----> LCD. is this a correct way?
If yes
1. Please let me know the rating of transformer that will be suitable for measuring 250 V AC. I don't want to use direct rectification of AC using bridge rectifier.
2. Should i use smoothing capacitor with bridge rectifier?
3. Is there any voltage divider needed?

Thank you all.

i cannot comment on this..
its better to use a metering IC from Analog Devices. you can measure other parameters too.

Thank you for your reply ajay. I saw an IC ADE7763 on net. But i think its is very hard to use it . i never used it before.

what are you trying to do? there is a thread for energy meter IC in forum by sanath embedded. you can read it here..
http://www.8051projects.net/forum-t16382-0.html

and see if he can help you out, as he has worked on it already.

Thanx ajay for giving me the link. well thread contains lots of knowledge. i think i have to study a lot to understand it. w

but if i want to measure ac voltage with adc809+8051, how cani do it ?

u can do it roughly not accurately
use a 220 to step down tansformer rectify that and convert to smooth dc measure that voltage that is directly proportional to input as on input voltage is drop at output it also drop or better that u convert voltage to frequency then by using opto coupler u can mesure voltage in the form of frequency
or use any ready made ic for ac voltmeter

how can i convert voltage to frequency?

there r many ics available for that one is LM331 and LM231

ICL7107 is a dedicated IC for measuring current and voltages...low cost,simple circuit with good accuracy..but it uses 7-Segment LED display