1-1
Description
The DEM-PCM/DSD1792/1794 is an evaluation module for the PCM1792
(DEM-PCM1792), DSD1792 (DEM-DSD1792), PCM1794 (DEM-PCM1794)
and DSD1794 (DEM-DSD1794) stereo audio DACs. For the PCM devices,
this EVM board accepts 24-bit linear PCM data at sampling rates up to f
S
= 96
kHz via the S/PDIF interface. For the non-S/PDIF interface, at a sampling rate
of f
S
= 192 kHz, 24-bit PCM data or 64-f
S
, 1-bit DSD data can be interfaced
directly at a connector on the board.
The DEM-PCM/DSD1792/1794 uses an NE5534 op amp for I/V conversion
in the analog output circuit to obtain excellent audio performance. There are
three analog signal output functions onboard as 2-V rms single-ended (RCA),
4.5-V rms single-ended (RCA), and 9-V rms balanced (XLR).
The DEM-PCM/DSD1792/1794 is operated by a
±
15-V analog power supply,
5-V DAC power supply and 5-V digital power supply. A single 5-V power supply
can be used to power the DAC and digital circuitry by setting a jumper
connection, but to obtain the specified audio performance, use of separate
power supplies is recommend.
Typical audio performance is as follows:
THD+N = 0.0004%
Dynamic range (EIAJ) = 128 dB (4 V rms)
Dynamic range (EIAJ) = 125 dB (2 V rms)
Topic
Page
1.1
Block Diagram
1-2
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1.2
DEM-PCM/DSD1792/1794 Power Supply Connection
1-2
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1.3
S/PDIF Connection
1-2
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1.4
Audio Output Connection
1-3
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1.5
Configuration Control
1-3
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1.6
Demo Software
1-5
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1.7
DEM-PCM/DSD1792/1794 Parts List (BOM)
1-7
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Chapter 1
