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參數(shù)資料
| 型號： | CDB4328 |
| 廠商： | Cirrus Logic, Inc. |
| 英文描述： | 18-Bit, Stereo D/A Converter for Digital Audio |
| 中文描述： | 18位，立體聲D / A的數(shù)字音頻轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/31頁 |
| 文件大?。?/td> | 831K |
| 代理商： | CDB4328 |
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THEORY OF OPERATION
The CS4328 architecture can be considered in
five blocks: Interpolation, sample/hold, delta-
sigma modulation, D/A conversion, and analog
filtering.
Audio data is input to the CS4328 digital inter-
polation filter which removes images of the input
signal that are present at multiples of the input
sample frequency, Fs (Figure 21). Following the
interpolation stage, the resulting frequency spec-
trum has images of the input signal at multiples
of eight times the input sample frequency, 8
×
Fs
(Figure 22). Eliminating the images between Fs
and 8
×
Fs greatly relaxes the requirements of the
analog filtering, allowing the suppression of im-
ages while leaving the audio band of interest
unaltered.
The CS4328 interpolation stage is followed by a
sample-and-hold function where the data points
from the interpolator are held for eight (64
×
Fs)
clock cycles. The resulting frequency response
is a sinx/x characteristic with zeros at 8
×
Fs mul-
tiples. The sinx/x zeros completely attenuate
signals at 8
×
Fs and largely suppress the remain-
ing energy of the images (Figure 23). The 8
×
interpolation followed by the 8
×
sample-and-
hold results in data at a rate of 64
×
Fs.
The delta-sigma modulator takes in the 64
×
Fs
data (3.072 MHz for 48kHz sampled systems)
and performs fifth-order noise shaping. In the
digital modulator of the CS4328, 18-bit audio
data is modulated to a 1-bit, 64
×
Fs signal. The
5th-order noise shaper allows 1-bit quantization
to support 18-bit audio processing by suppress-
ing quantization noise in the bandwidth of
interest. Figure 24 shows the frequency spec-
trum of the modulator output.
The CS4328’s digital modulator is followed by a
D-to-A converter that translates the 1-bit signal
into a series of charge packets. The magnitude
of the charge in each packet is determined by
sampling of a voltage reference onto a switched
Audio
Data
Analog
Output
Continuous
Time
Filter
DAC
8 X S/H
8x
Interpolator
Delta
Sigma
Modulator
Digital
Switched
Cap
LPF
Analog Filter
Figure 20. CS4328 Architecture
f (kHz)
8Fs
16Fs
24
(dB)
Figure 23. Spectrum After S/H
f (kHz)
8Fs
16Fs
24
(dB)
Figure 22. 8X Interpolated Data Spectrum
f(kHz)
24
(dB)
Figure 24. Modulator Output Spectrum
f (kHz)
Fs
2Fs
24
Figure 21. Input Data Spectrum
(dB)
CS4328
DS62F3
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CDB4329 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:20-Bit, Stereo D/A Converter for Digital Audio |
| CDB4334 | 功能描述:音頻 IC 開發(fā)工具 Eval Bd 8Pin 24-Bit 96kHz DAC RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| CDB4338 | 功能描述:音頻 IC 開發(fā)工具 Eval Bd 8Pin 96kHz DAC RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| CDB4339 | 功能描述:音頻 IC 開發(fā)工具 Eval Bd 8Pin 96kHz DAC RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| CDB4340 | 功能描述:音頻 IC 開發(fā)工具 Eval Bd 101dB 96kHz DAC RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
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