Passive I/V vs. traditional I/V, FFT pics. - diyAudio
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Old 29th May 2004, 04:39 PM   #1
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Default Passive I/V vs. traditional I/V, FFT pics.

The following pics are taken with SpectraLab using a laptop on batteries and a slightly modified USB soundcard also run on batteries.

The passive I/V DAC is a balanced PCM1704K with a resistor (100ohms) between I out on the dacs, nothing xtra to ground.
The measurements for this dac are taken at the poweramp output.
The PCM1704 passive I/V is being compared to the Denon 2900 DVD using the BB PCM/DSD 1792 and standard I/V etc basically (different opamps) as described in TI's datasheets. These pics are directly from line out. The spec on this player says 0.0009% THD @ 1kHz.

First out is the Denon @-20dB..
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Old 29th May 2004, 04:41 PM   #2
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PCM 1704 passive I/V @ -20dB
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Old 29th May 2004, 04:42 PM   #3
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the denon @ -60dB
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Old 29th May 2004, 04:43 PM   #4
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The passive PCM1704 @ -60dB
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Old 29th May 2004, 04:47 PM   #5
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Denon @ -90dB
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Old 29th May 2004, 04:49 PM   #6
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The PCM1704
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Old 29th May 2004, 04:51 PM   #7
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Denon @ -100dB (16 bit data)
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Old 29th May 2004, 04:52 PM   #8
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The passive PCM1704 dac @ -100dB (16bit data)
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Old 29th May 2004, 04:58 PM   #9
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Considering my expectations based on the general consensus on this forum about passive I/V I think this is pretty good and way beyond my expectations.

The following pics are direct spdif dumps from the same source.
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Old 29th May 2004, 05:01 PM   #10
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-60dB
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