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參數(shù)資料
| 型號(hào)： | PCM1721 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Stereo Audio Digital-To-Analog Converter With Programmable PLL(帶可編程PLL立體聲音頻D\A轉(zhuǎn)換器) |
| 中文描述： | 立體聲音頻數(shù)字模擬轉(zhuǎn)換器（帶可編程鎖相環(huán)立體聲音頻?\\阿轉(zhuǎn)換器，具有可編程鎖相環(huán)） |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 227K |
| 代理商： | PCM1721 |
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13
PCM1721
APPLICATION
CONSIDERATIONS
DELAY TIME
There is a finite delay time in delta-sigma converters. In A/D
converters, this is commonly referred to as latency. For a
delta-sigma D/A converter, delay time is determined by the
order number of the FIR filter stage, and the chosen sampling
rate. The following equation expresses the delay time of
PCM1721:
T
D
= 11.125
x
1/f
S
For f
S
= 44.1kHz, T
D
= 11.125/44.1kHz = 251.4
μ
s
Applications using data from a disc or tape source, such as
CD audio, CD-Interactive, Video CD, DAT, Minidisc, etc.,
generally are not affected by delay time. For some profes-
sional applications such as broadcast audio for studios, it is
important for total delay time to be less than 2ms.
OUTPUT FILTERING
For testing purposes all dynamic tests are done on the
PCM1721 using a 20kHz low pass filter. This filter limits
the measured bandwidth for THD+N, etc. to 20kHz. Failure
to use such a filter will result in higher THD+N and lower
SNR and Dynamic Range readings than are found in the
specifications. The low pass filter removes out of band
noise. Although it is not audible, it may affect dynamic
specification numbers.
The performance of the internal low pass filter from DC to
24kHz is shown in Figure 9. The higher frequency rolloff of
the filter is shown in Figure 10. If the user’s application has
the PCM1721 driving a wideband amplifier, it is recom-
mended to use an external low pass filter. A simple 3rd-
order filter is shown in Figure 11. For some applications, a
passive RC filter or 2nd-order filter may be adequate.
FIGURE 10. Low Pass Filter Wideband Frequency Response.
FIGURE 9. Low Pass Filter Frequency Response.
1.0
0.5
0
–0.5
–1.0
d
20
Frequency (Hz)
100
1k
10k
24k
INTERNAL ANALOG FILTER FREQUENCY RESPONSE
(20Hz~24kHz, Expanded Scale)
10
5
0
–5
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
d
INTERNAL ANALOG FILTER FREQUENCY RESPONSE
(10Hz~10MHz)
FIGURE 11. 3rd-Order LPF.
10k
10k
680pF
10k
1500pF
100pF
+
V
SIN
–
90
0
–90
–180
–270
–360
100
1k
10k
100k
1M
GAIN vs FREQUENCY
Frequency (Hz)
P
6
–14
–34
–54
–74
–94
G
Gain
Phase
OPA604
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| PCM1725U | Stereo Audio DIGITAL-TO-ANALOG CONVERTER 16 Bits, 96kHz Sampling |
| PCM1727 | Stereo Audio DIGITAL-TO-ANALOG CONVERTER WITH PROGRAMMABLE DUAL PLL TM |
| PCM1728 | 24-Bit, 96kHz Sampling CMOS Delta-Sigma Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCM1723 | 制造商:BB 制造商全稱(chēng):BB 功能描述:Stereo Audio DIGITAL-TO-ANALOG CONVERTER WITH PROGRAMMABLE PLL |
| PCM1723E | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC Ster DAC w/Prog PLL RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類(lèi)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 |
| PCM1723E/2K | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC Ster DAC w/Prog PLL RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類(lèi)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 |
| PCM1723E/2KG4 | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC Ster DAC w/Prog PLL RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類(lèi)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 |
| PCM1723EG | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
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