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參數資料
| 型號： | PCM1715U |
| 英文描述： | Dual Voltage Output CMOS Delta-Sigma DIGITAL-TO-ANALOG CONVERTER With On-Chip Digital Filter |
| 中文描述： | 雙電壓輸出的CMOSΔ-Σ數字至模擬轉換器，帶有片上數字濾波器 |
| 文件頁數： | 6/9頁 |
| 文件大小： | 77K |
| 代理商： | PCM1715U |
PCM1715U
6
0
–100
–120
–140
–160
0
5
10
15
20
Frequency (kHz)
(
0
–100
–120
–140
–160
0
5
10
15
20
Fre
(
THEORY OF
DELTA-SIGMA OPERATION
The delta-sigma section of the PCM1715 is based on a 5-
level amplitude quantizer and a 4th-order filter. This con-
verts the oversampled 16-bit input data to 5-level delta-
sigma form. A block diagram of the 5-level modulator is
shown in Figure 1.
FIGURE 3. Quantization Noise Spectrum (256fs).
FIGURE 4. Quantization Noise Spectrum (384fs).
FIGURE 2. Block Diagram of the Hf(z).
A block diagram of the 4th-order filter section Hf(z) in the
delta-sigma modulator is shown in Figure 2.
In general, high order 1-bit delta-sigma modulators have
disadvantages due to loop instability. The 5 level delta-
sigma modulator of the PCM1715 uses phase compensation
techniques to obtain stable operation. In Figure 2, the coef-
ficients, b1 to b4, give the basic form of the filter and –a1
and –a2 are used for phase compensation of the feedback
loop.
The theoretical quantization noise performance of the 5-
level delta-sigma modulator is shown in Figures 3 and 4. In
the audio band, the quantization noise floor level of the
PCM1715 is less than –130dB (384fs).
MODE OF OPERATION
Serial inputs to MD, MC, and ML (Pins 26, 27 and 28)
control the following functions:
(1) Digital Attenuator [AL0 ~ AL7, AR0 ~ AR7]
Attenuation data is constructed by 8-bit/Lch, 8-bit/Rch
(total 16-bit), can be controlled as 255 step attenuation
by individual channel. AL0 and AR0 are LSB, and AL7
and AR7 are MSB. Attenuation Level ATT is given by:
ATT = 20LOG
10
(ATT DATA/255) [dB]
FIGURE 1. Block Diagram of 5-Level Delta-Sigma Quan-
tizer.
This 5-level delta-sigma modulator has the advantage of
stability of delta-sigma loop and jitter sensitivity over the
typical 1-bit (2-level) delta-sigma modulator.
The combined oversampling rate of the delta-sigma modu-
lator and the internal 8x oversampling digital filter is 48fs at
a system clock speed of 384fs, 32fs at a system clock speed
of 256fs.
In
Out
+
+
–
+
4
3
2
1
0
Hf(Z)
5-level Quantizer
32fs/48fs
5-level
8fs/
16 bits
Out
In
–a1
Z
–1
Z
–1
Z
–1
Z
–1
b4
b3
b2
b1
–a2
+
+
+
+
+
+
+
+
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相關代理商/技術參數 |
參數描述 |
|---|---|
| PCM1716 | 制造商:BB 制造商全稱:BB 功能描述:24-Bit, 96kHz Sampling CMOS Delta-Sigma Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
| PCM1716E | 功能描述:音頻數/模轉換器 IC 24-Bit 96kHz Smplg CMOS D-S Stereo DAC RoHS:否 制造商:Texas Instruments 轉換器數量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM1716E | 制造商:Texas Instruments 功能描述:24BIT DAC CMOS STEREO SMD 1716 |
| PCM1716E/2K | 功能描述:音頻數/模轉換器 IC 24-Bit 96kHz Smplg CMOS D-S Stereo DAC RoHS:否 制造商:Texas Instruments 轉換器數量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM1716E/2KG4 | 功能描述:音頻數/模轉換器 IC 24-Bit 96kHz Smplg CMOS D-S Stereo DAC RoHS:否 制造商:Texas Instruments 轉換器數量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
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