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參數(shù)資料
| 型號： | CDB4228A |
| 廠商： | Cirrus Logic, Inc. |
| 元件分類： | Codec |
| 英文描述： | 24-Bit, 96 kHz Surround Sound Codec |
| 中文描述： | 24位96千赫環(huán)繞聲解碼器 |
| 文件頁數(shù)： | 13/32頁 |
| 文件大小： | 518K |
| 代理商： | CDB4228A |
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CS4228A
DS511PP1
13
The high pass filters can be disabled by setting the
HPF bit in the ADC Control register. When assert-
ed, any DC present at the analog inputs will be rep-
resented in the ADC outputs. The high pass filter
may also be “frozen” using the HPFZ bit in the
ADC Control register. In this condition, it will re-
member the DC offset present at the ADC inputs at
the moment the HPFZ bit was asserted, and will
continue to remove this DC level from the ADC
outputs. This is useful in cases where it is desirable
to eliminate a fixed DC offset while still maintain-
ing full frequency response down to DC.
3.3 Analog Outputs
3.3.1 Line Level Outputs
The CS4228A contains on-chip buffer amplifiers
capable of producing line level outputs. These am-
plifiers are biased to a quiescent DC level of ap-
proximately 2.3 V. This bias, as well as variations
in offset voltage, are removed using off-chip AC
load coupling.
The delta-sigma conversion process produces high
frequency noise beyond the audio passband, most
of which is removed by the on-chip analog filters.
The remaining out-of-band noise can be attenuated
using an off-chip low pass filter. For most applica-
tions, a simple passive filter as show in Figure 7 can
be used. Note that this circuit also serves to block
the DC present at the outputs. Figure 8 gives an ex-
ample of a filter which can be used in applications
where greater out of band attenuation is desired.
The 2-pole Butterworth filter has a -3 dB frequency
of 50 kHz, a passband attenuation of 0.1 dB at
20 kHz providing optimal out-of-band filtering for
sample rates from 44.1 kHz to 96 kHz. The filter
has and a gain of 1.56 providing a 2 Vrms output
signal.
3.3.2 Digital Volume Control
Each DAC’s output level is controlled via the Dig-
ital Volume Control register operating over the
range of 0 to 90.5 dB attenuation with 0.5 dB reso-
lution. Volume control changes do not occur in-
stantaneously. Instead they ramp in increments of
0.125 dB at a variable rate controlled by the
RMP1:0 bits in the Digital Volume Control regis-
ter.
560
2Sor
2SC3326
2.2 k
MUN2IIIT1
10 k
MUTEC
Line Out
C
MUTEDRV
10 k
+
22
μ
F
100 k
AOUT
Figure 7. Passive Output Filter with Mute
C=142
μ
F
F
s
_
3.57 k
+
2-Pole Butterworth Filter
A
OUT
3.57 k
MC33078
100 pf
1 nf
GND
1 nf
3.57 k
10
μ
f
2 k
10
μ
f
+
MUTE DRV
Line
Out
MUTE
+
5
6
7
2 VRMS
Figure 8. Butterworth Output Filter with Mute
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CDB4228 | 24-Bit, 96 kHz Surround Sound Codec |
| CDB42416 | 110 dB, 192kHz 6-Ch CODEC WITH PLL |
| CDB42418 | 110 dB, 192kHz 8-Ch CODEC WITH PLL |
| CDB42426 | 114 dB, 192kHz 6-Ch CODEC WITH PLL |
| CDB42428 | 114 dB, 192kHz 8-Ch CODEC WITH PLL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CDB42324 | 功能描述:音頻 IC 開發(fā)工具 Eval Bd 2-In 4-Out Mult. -Ch CODEC 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 |
| CDB42325 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:10-In, 6-Out, 2 Vrms Audio CODEC with Headphone |
| CDB42406 | 制造商:Cirrus Logic 功能描述:EVAL BD FOR CS42406 - Bulk |
| CDB42416 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:110 dB, 192kHz 6-Ch CODEC WITH PLL |
| CDB42418 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:110 dB, 192kHz 8-Ch CODEC WITH PLL |
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