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參數(shù)資料
| 型號(hào)： | PCM1718E |
| 英文描述： | Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 立體聲音頻數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大?。?/td> | 172K |
| 代理商： | PCM1718E |
9
PCM1718E
FIGURE 10. 5-Level
Σ
Modulator Block Diagram.
POWER SUPPLY
CONNECTIONS
PCM1718 has two power supply connections: digital (V
DD
)
and analog (V
CC
). Each connection also has a separate
ground. If the power supplies turn on at different times, there
is a possibility of a latch-up condition. To avoid this condi-
tion, it is recommended to have a common connection
between the digital and analog power supplies. If separate
supplies are used without a common connection, the delta
between the two supplies during ramp-up time must be less
than 0.6V.
An application circuit to avoid a latch-up condition is shown
in Figure 9.
DGND
AGND
V
DD
V
CC
Digital
Power Supply
Analog
Power Supply
FIGURE 9. Latch-up Prevention Circuit.
BYPASSING POWER SUPPLIES
The power supplies should be bypassed as close as possible
to the unit. Refer to Figure 8 for optimal values of bypass
capacitors.
THEORY OF OPERATION
The delta-sigma section of PCM1718 is based on a 5-level
amplitude quantizer and a 3rd-order noise shaper. This
section converts the oversampled input data to 5-level delta-
sigma format.
A block diagram of the 5-level delta-sigma modulator is
shown in Figure 10. This 5-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 internal 8-times interpolation filter is 48fs for
a 384fs system clock, and 64fs for a 256fs system clock. The
theoretical quantization noise performance of the 5-level
delta-sigma modulator is shown in Figure 11.
20
0
–20
–40
–60
–80
–100
–120
–140
–160
3rd-ORDER
Σ
MODULATOR
Frequency (kHz)
0
5
10
15
20
G
25
FIGURE 11. Quantization Noise Spectrum.
Out
48fs
(384fs)
64fs
(256fs)
In
8fs
18-Bit
+
+
+
4
3
2
1
0
5-level Quantizer
+
–
+
Z
–1
+
–
+
Z
–1
+
+
Z
–1
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| PCM1720 | Stereo Audio DIGITAL-TO-ANALOG CONVERTER MPEG2/AC-3 COMPATIBLE |
| PCM1772 | LOW VOLTAGE AND LOW POWER STEREO AUDIO DIGITAL TO ANALOG CONVERTER WITH LINEOUT AMPIIFIER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCM1718E/2K | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC SoundPlus Stereo 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 |
| PCM1718E/2KG4 | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC SoundPlus Stereo 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 |
| PCM1718EG | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| PCM1718EG4 | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC SoundPlus Stereo 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 |
| PCM1719 | 制造商:BB 制造商全稱:BB 功能描述:Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
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