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參數(shù)資料
| 型號： | PCM1737E |
| 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(qiáng)的多級，Δ-Σ，音頻數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 19/27頁 |
| 文件大?。?/td> | 180K |
| 代理商： | PCM1737E |
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26
PCM1737
THEORY OF OPERATION
The delta-sigma section of PCM1737 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 17. 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.
FIGURE 18. Quantization Noise Spectrum (64x/128x oversampling).
FIGURE 17. Eight-Level Delta-Sigma Modulator.
FIGURE 19. Jitter Sensitivity.
0
100
200
300
400
500
600
125
120
115
110
105
100
95
90
Dynamic
Range
(dB)
Jitter (ps)
CLOCK JITTER
The combined oversampling rate of the delta-sigma modu-
lator and the interpolation filter is 64fS or 128fS.
The theoretical quantization noise performance of the
8-level delta-sigma modulator is shown in Figure 18. 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 19.
KEY PERFORMANCE
PARAMETERS AND MEASUREMENT
This section provides information on how to measure key
dynamic performance parameters for the PCM1737. 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.
For the PCM1737, THD+N is measured with a full scale,
1kHz digital sine wave as the test stimulus at the input of the
01
2
3
4
5
6
7
8
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
Amplitude
(dB)
Frequency (f
S)
01
2
3
4
5
6
7
8
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
Amplitude
(dB)
Frequency (f
S)
128x Oversampling
64x Oversampling
+
Z–1
8-Level Quantizer
+
Z–1
+
Z–1
–
+
Z–1
+
4f
S or 8fS
64f
S or 128fS
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參數(shù)描述 |
|---|---|
| PCM1737E/2K | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 24-Bit 192kHz Smplg Enh Mltl D-S DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM1737E/2KG4 | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 24-Bit 192kHz Smplg Enh Mltl D-S DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM1737E-1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| PCM1737EG4 | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 24-Bit 192kHz Smplg Enh Mltl D-S DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM1738 | 制造商:BB 制造商全稱:BB 功能描述:24-Bit, 192kHz Sampling, Advanced Segment, Audio-Stereo DIGITAL-TO-ANALOG CONVERTER |
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