PCM1741/E2K BURR-BROWN [Burr-Brown Corporation], PCM1741/E2K Datasheet - Page 19

• Manufacturer Part Number: PCM1741/E2K
• Description: +3.3V Single-Supply, 24-Bit, 96kHz Sampling Enhanced Multilevel, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

FIGURE 16. Jitter Sensitivity.
PCM1741
The theoretical quantization noise performance of the
8-level delta-sigma modulator is shown in Figure 15. The en-
hanced multilevel delta-sigma architecture also has advantages
for input clock jitter sensitivity due to the multilevel quantizer,
with the simulated jitter sensitivity, as shown in Figure 16.
FIGURE 17. Test Setup for THD+N Measurements.
FIGURE 15. Quantization Noise Spectrum.
SBAS175
125
120
115
110
105
100
–100
–120
–140
–160
–180
95
90
–20
–40
–60
–80
0
0
0
JITTER DEPENDENCE (64x Oversampling)
100
1
S/PDIF
Output
QUANTIZATION NOISE SPECTRUM
2
200
(64x Oversampling)
1kHz Sine Wave
3
Frequency (f
Jitter (ps)
Generator
0dBFS,
300
Digital
4
S
400
)
5
6
500
rms Mode
Analyzer
Display
and
7
600
8
Evaluation Board
DEM-DAI1741
Receiver
Apogee
S/PDIF
20kHz
Filter
KEY PERFORMANCE PARAMETERS
AND MEASUREMENT
This section provides information on how to measure key
dynamic performance parameters for the PCM1741. 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 DACs, 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 17
shows the test setup for THD+N measurements.
For the PCM1741, 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 a 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
–100
–120
–140
–160
–180
–20
–40
–60
–80
0
0
HPF = 22Hz
LPF = 30kHz
Band Limit
PCM1741
1
QUANTIZATION NOISE SPECTRUM
2
f
–3dB
(128x Oversampling)
= 54kHz or 108kHz
3
Frequency (f
Notch Filter
2nd-Order
Low-Pass
f
C
Filter
= 1kHz
4
S
)
5
6
7
8
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