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Re: [Discuss-gnuradio] ADC Specs

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] ADC Specs
Date: Mon, 15 Dec 2008 14:35:50 -0800
User-agent: Thunderbird (X11/20081119)

Brian Padalino wrote:
On Mon, Dec 15, 2008 at 4:41 PM, Aadil Volkwin <address@hidden> wrote:
"The full range on the ADCs is 2V peak to peak, and the input is 50 ohms
differential. This is equates to 40mW, or 16dBm."

I am not sure where that sentence came from, but it is incorrect. The correct statement would be:

"The full-scale range of the ADCs is 2V peak to peak. The BasicRX and LFRX have unity voltage gain and an input impedance of 50 ohms. Thus, their full-scale input is 2Vpp, or 10dBm."

2Vpp is equal to 1 Volt peak, or .707 Vrms. At 50 ohms, this comes to 10 mW or 10dBm. Also, while the ADC has a nominally 200 ohm input impedance, the BasicRX and LFRX terminate in 50 ohms.


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