AD1862 interfacing - technical question

Painkiller · 31st January 2011, 07:18 AM

I have a question about interfacing the AD1862 with a digital filter. The digital filter sends out BTC MSB-first at 11.2896 MHz, which I understand works fine with this chip. But since the AD-chip converts the last 20 bits after LE goes low, what happens if the dac is fed with a 24-bit signal? Is it mandatory to convert the signal to 20 bits?

rfbrw · 1st February 2011, 04:48 AM

Depending on the output format of the DF, the first 4 MSB's or the last 4 LSB's get ignored.

Painkiller · 1st February 2011, 06:59 AM

Thanks for the reply

The signal is Two's complement, MSB first. The most significant bit is sent first, but these first 4 bits will be ignored by the dac. I guess this would give an error in the conversion, but I don't really understand how the AD1862 works to convert the input signal, so I might be wrong.

31st January 2011, 07:18 AM	#1
Painkiller diyAudio Member Join Date: Sep 2006	AD1862 interfacing - technical question I have a question about interfacing the AD1862 with a digital filter. The digital filter sends out BTC MSB-first at 11.2896 MHz, which I understand works fine with this chip. But since the AD-chip converts the last 20 bits after LE goes low, what happens if the dac is fed with a 24-bit signal? Is it mandatory to convert the signal to 20 bits?

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1st February 2011, 04:48 AM	#2
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	Depending on the output format of the DF, the first 4 MSB's or the last 4 LSB's get ignored.

1st February 2011, 06:59 AM	#3
Painkiller diyAudio Member Join Date: Sep 2006	Thanks for the reply The signal is Two's complement, MSB first. The most significant bit is sent first, but these first 4 bits will be ignored by the dac. I guess this would give an error in the conversion, but I don't really understand how the AD1862 works to convert the input signal, so I might be wrong.

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