Hi All,
I am starting a project using an FPGa to control a ADC. The input to the ADC will be audio. My problem comes with connecting the microphone up to the ADC. The ADC chip is a single supply chip going from VCC to GND.
Now i am a little confussed here whether i have chosen the correct ADC for my application. If we imagine the audio signal input will be a sine wave it will have a positive cycle and a negative cycle (obvious). However my ADC only deals with positive signals as there is no -ve VREF.
My other confussion is even if i did use a ADC chip with a +ve and -ve REF how does the digital bits correspond to a negative voltage?
the ADC chip i am using is the ADCS7476.
datasheet
www.national.com/pf/AD/ADCS7476.html
does anyone have any experience with interfacing ADC, i would appreciate any comments,
Thank You
Andy
I am starting a project using an FPGa to control a ADC. The input to the ADC will be audio. My problem comes with connecting the microphone up to the ADC. The ADC chip is a single supply chip going from VCC to GND.
Now i am a little confussed here whether i have chosen the correct ADC for my application. If we imagine the audio signal input will be a sine wave it will have a positive cycle and a negative cycle (obvious). However my ADC only deals with positive signals as there is no -ve VREF.
My other confussion is even if i did use a ADC chip with a +ve and -ve REF how does the digital bits correspond to a negative voltage?
the ADC chip i am using is the ADCS7476.
datasheet
www.national.com/pf/AD/ADCS7476.html
does anyone have any experience with interfacing ADC, i would appreciate any comments,
Thank You
Andy