參數(shù)資料
型號(hào)： PCM1740
英文描述： CONN,CPRSN,2-WAY
中文描述： 立體聲音頻數(shù)模轉(zhuǎn)換器與石英振蕩器和PLL
文件頁(yè)數(shù)： 18/20頁(yè)
文件大?。?/td> 359K
代理商： PCM1740
18
PCM1740
The VTUN control voltage is generated by the MPEG-2
controller, which compares the MCKO output clock from
the PCM1740 with the clock count received from the trans-
mitter. VTUN is adjusted to retain clock synchronization
between the transmitted and received signals. The SCKO
output is used as the audio master clock for the audio
decoder and additional data converters.
V
COM
Output
The unbuffered DC common-mode voltage output, V
COM
(pin 15), is brought out mainly for de-coupling purposes.
V
COM
is nominally biased to V
CC
/2. The V
COM
output may
be used to bias external circuits, but it must be connected to
a high-impedance node or buffered using a voltage follower.
Figure 18 shows examples of the proper use of the V
COM
output for external biasing applications.
DAC Output Filtering
Delta-Sigma D/A converters utilize noise shaping tech-
niques to improve in-band signal-to-noise (SNR) perfor-
mance at the expense of generating increased out of band
noise above the Nyquist frequency, or f
S
/2. The out of band
noise must be low-pass filtered in order to provide optimal
converter performance. This is accomplished by a combina-
tion of on-chip and external low-pass filtering.
The PCM1740 includes an on-chip low-pass filter as part of
the output amplifier stage. The frequency response for the
filter is shown in the Typical Performance Curves section
of this data sheet. The –3dB cutoff frequency is fixed at
100kHz.
Figure 19 shows the recommended external low-pass active
filter circuits for dual and single-supply applications. These
circuits are second-order Butterworth filters using the Mul-
tiple Feedback (MFB) circuit arrangement. Both filters have
a cutoff frequency of 30kHz. Figure 19(a) is a dual-supply
filter with a gain of 1.85 (for a standard 2 V
RMS
line output
level). Figure 19(b) is a single-supply filter with a gain of 1.
Values for the filter components may be calculated using the
FilterPro program, available from the Burr-Brown web site
(www.burr-brown.com) and local sales offices. For more
information regarding MFB active filter design and the
FilterPro program, please refer to Burr-Brown Applications
Bulletin, AB-034.
Since the overall system performance is defined primarily
by the quality of the D/A converters and their associated
analog output circuitry, op amps designed specifically for
audio applications are recommended for the active filters.
Burr-Brown’s OPA2134, OPA2353, and OPA2343 dual op
amps are ideal for use with the PCM1740.
FIGURE 18. Using V
COM
To Bias External Circuitry.
+
V
OUT
Non-Polarized
1
μ
F
PCM1740
1-10
μ
F
V
COM
V
CC
PCM1740
OPA337
OPA343
+
1-10
μ
F
Use voltage follower
to buffer V
COM
To Bias
Nodes
V
COM
(a) Biasing an External Active Filter Stage
(b) Using a Buffer to Provide Bias for Multiple or
Low Input Impedance Nodes
相關(guān)PDF資料
PDF描述
PCM1740E Stereo Audio DIGITAL-TO-ANALOG CONVERTER with VCXO and PLL
PCM1741 %2B3.3V Single-Supply, 24-Bit, 96kHz Sampling Enhanced Multilevel, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER
PCM1741E +3.3V Single-Supply, 24-Bit, 96kHz Sampling Enhanced Multilevel, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER
PCM1742 24-Bit, 192kHz Sampling Enhanced Multilevel, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER
PCM1742E 24-Bit, 192kHz Sampling Enhanced Multilevel, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCM1740E 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC Stereo DAC w/Prog PLL&VCXO 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
PCM1740E/2K 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC Stereo DAC w/Prog PLL&VCXO 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
PCM1740E/2KG4 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC Stereo DAC w/Prog PLL&VCXO 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
PCM1740E-1/2K 制造商:Texas Instruments 功能描述:
PCM1740EG4 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC Stereo DAC w/Prog PLL&VCXO 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
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