PCM1604 BURR-BROWN [Burr-Brown Corporation], PCM1604 Datasheet - Page 31

• Manufacturer Part Number: PCM1604
• Description: 24-Bit, 192kHz Sampling,6-Channel, Enhanced Multi-Level, Delta-Sigma DIGITAL-TO-ANALOG CONVERTER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

PERFORMANCE MEASUREMENTS
This section provides information on how to measure key
dynamic performance parameters for the PCM1604 and
PCM1605. In all cases, an Audio Precision System Two
Cascade or equivalent audio measurement system is utilized
to perform the testing.
TOTAL HARMONIC DISTORTION + NOISE
Total Harmonic Distortion + Noise (THD+N) is a significant
figure of merit for audio D/A converters, since it takes into
account both harmonic distortion and all noise sources
within a specified measurement bandwidth. The true rms
value of the distortion and noise is referred to as THD+N.
FIGURE 22. Test Setup for THD+N Measurements.
NOTES: (1) There is little difference
in measured THD+N when using the
various settings for these filters.
(2) Required for THD+N test.
S/PDIF
Output
100% Full Scale
24-Bit, 1kHz
Sine Wave
Generator
Digital
Evaluation Board
31
DEM-DAI1604
For the PCM1604 and PCM1605 D/A converters, THD+N is
measured with a full scale, 1kHz digital sine wave as the test
stimulus at the input of the DAC. The digital generator is set
to 24-bit audio word length and a sampling frequency of
44.1kHz, or 96kHz. The digital generator output is taken
from the unbalanced S/PDIF connector of the measurement
system. The S/PDIF data is transmitted via coaxial cable to
the digital audio receiver on the DEM-DAI1604 demo board.
The receiver is then configured to output 24-bit data in either
I
format is programmed to match the receiver output format.
The analog output is then taken from the DAC post filter and
connected to the analog analyzer input of the measurment
system. The analog input is band limited using filters resi-
dent in the analyzer. The resulting THD+N is measured by
the analyzer and displayed by the measurement system.
RMS Mode
2
Receiver
Analyzer
Display
S/PDIF
S or left-justified data format. The DAC audio interface
and
PCM1604, PCM1605
Option = 20kHz Apogee Filter
HPF = 22Hz
LPF = 30kHz
Band Limit
PCM1604
PCM1605
(1)
(1)
f
–3dB
Notch Filter
2nd-Order
Low-Pass
f
C
Filter
= 1kHz
= 54kHz
(2)
®