參數(shù)資料
型號: PCM1739E
英文描述: 24-Bit, 192kHz Sampling, Enhanced Multi-Level, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER
中文描述: 24位192kHz采樣,增強的多級,Δ-Σ,音頻數(shù)字模擬轉換器
文件頁數(shù): 15/16頁
文件大?。?/td> 140K
代理商: PCM1739E
15
PCM1739
FIGURE 12. Eight-Level Delta-Sigma Modulator.
FIGURE 14. Jitter Sensitivity.
FIGURE 13. Quantization Noise Spectrum.
0
100
200
300
400
500
600
125
120
115
110
105
100
95
90
85
80
D
Jitter (ps)
CLOCK JITTER
0
1
2
3
4
5
6
7
8
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
Frequency (f
S
)
+
Z
–1
8-Level Quantizer
+
Z
–1
+
Z
–1
+
Z
–1
+
+
4f
S
or 8f
S
64f
S
inductance (RF choke, ferrite bead) should be placed be-
tween the analog and digital +5V supply connections to
avoid coupling of the digital switching noise into the analog
circuitry. Figure 11 shows the recommended approach for
single-supply applications
THEORY OF OPERATION
The delta-sigma section of PCM1739 is based on a 8-level
amplitude quantizer and a 4th-order noise shaper. This
section converts the oversampled input data to 8-level delta-
sigma format.
A block diagram of the 8-level delta-sigma modulator is
shown in Figure 12. This 8-level delta-sigma modulator has
the advantage of stability and clock jitter sensitivity over the
typical one-bit (2-level) delta-sigma modulator.
The combined oversampling rate of the delta-sigma modu-
lator and the interpolation filter is 64f
S
for all system clock
combinations (128, 192, 256, 384, 512, 768f
S
).
The theoretical quantization noise performance of the
8-level delta-sigma modulator is shown in Figure 13. The
enhanced multi-level delta-sigma architecture also has ad-
vantages for input clock jitter sensitivity due to the multi-
level quantizer, with the simulated jitter sensitivity shown in
Figure 14.
KEY PERFORMANCE
PARAMETERS AND MEASUREMENT
This section provides information on how to measure key
dynamic performance parameters for the PCM1739. In all
cases, an Audio Precision System Two Cascade or equiva-
lent audio measurement system is utilized to perform the
testing.
TOTAL HARMONIC DISTORTION + NOISE
Total Harmonic Distortion + Noise (THD+N) is a signifi-
cant 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.
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