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參數(shù)資料
| 型號： | CDB42L51 |
| 廠商： | Cirrus Logic, Inc. |
| 英文描述： | Silver Mica Capacitor; Capacitance:120pF; Capacitance Tolerance:+/- 5%; Series:CDV16; Voltage Rating:1000VDC; Capacitor Dielectric Material:Mica; Termination:Radial Leaded; Lead Pitch:5.94mm; Leaded Process Compatible:Yes RoHS Compliant: Yes |
| 中文描述： | 低功耗，立體聲耳機放大器編解碼器 |
| 文件頁數(shù)： | 29/83頁 |
| 文件大小： | 1348K |
| 代理商： | CDB42L51 |
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DS679A2
29
CS42L51
4.3.2
High-Pass Filter and DC Offset Calibration
The high-pass filter continuously subtracts a measure of the DC offset from the output of the decimation
filter. If the high-pass filter is “frozen” during normal operation, the current value of the DC offset for the
corresponding channel is held. It is this DC offset that will continue to be subtracted from the conversion
result. This feature makes it possible to perform a system DC offset calibration by:
1.
1) Running the CODEC with the high-pass filter enabled and the DC offset not “frozen” until the filter
settles. See the Digital Filter Characteristics for filter settling time.
2.
Freezing the DC offset.
The high-pass filters are controlled using the ADCx_HPFRZ and ADCx_HPFEN bits.
If a particular ADC channel is used to measure DC voltages, the high-pass filter may be disabled using
the ADCx_HPFEN bit.
4.3.3
Digital Routing
The digital output of the ADC may be internally routed to the signal processing engine for playback of an-
alog input signals. Volume to the DAC may be controlled using the ADCMIX[6:0] bits. The serial input data
may also be routed to the ADC serial interface using the DIGMIX bit. This is useful for recording a digital
mix along with the analog input.
4.3.4
Differential Inputs
The stereo pair inputs act as a single differential input when the MICMIX bit is enabled. This provides com-
mon mode rejection of noise in digitally intense PCB’s where the microphone signal traverses long traces,
or across long microphone cables as illustrated in
Figure 10
.
Since the mixer provides a differential combination of the two signals, the potential input mix may exceed
the maximum full-scale input and result in clipping. The level out of the mixer, therefore, is automatically
attenuated 6 dB. Gain may be applied using either the analog PGA or MIC Pre-amp or the digital ADCMIX
volume control to re-adjust a small signal to desired levels.
The analog inputs may also be used as a differential input pair as illustrated in
Figure 11
. The two chan-
nels are differentially combined when the MICMIX bit is enabled.
4.3.4.1
External Passive Components
The microphone input is internally biased to VQ. Input signals must be AC coupled using external capaci-
tors with values consistent with the desired high-pass filter design. The MICINx input resistance of 50 k
may be combined with an external capacitor of 1
μ
F to achieve the cutoff frequency defined by the equa-
tion,
2
π
50
k
(
)
1
μ
F
(
An electrolytic capacitor must be placed such that the positive terminal is positioned relative to the side with
the greater bias voltage. The MICBIAS voltage level is controlled by the MICBIAS_LVL[1:0] bits.
Software
Controls:
“ADC Control (Address 06h)” on page 52
.
Software
Controls:
“ADCx Mixer Volume Control: ADCA (Address 0Eh) & ADCB (Address 0Fh)” on page 58
,
“Inter-
face Control (Address 04h)” on page 49
.
fc
)
--------------------1
3.18
Hz
=
=
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CDB42L51/FAE | 制造商:Cirrus Logic 功能描述:EVAL BOARD FOR THE CS42L51 PORTABLE STEREO CODEC - Bulk |
| CDB42L52 | 功能描述:音頻 IC 開發(fā)工具 Eval Bd LP CODEC w/classD Spkr Driver 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 |
| CDB42L52/FAE | 制造商:Cirrus Logic 功能描述:EVAL BD LOW-VOLTAGE STEREO CODEC - Bulk |
| CDB42L55 | 功能描述:音頻 IC 開發(fā)工具 Eval Bd Ultra Low PWR Stereo 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 |
| CDB42L56 | 功能描述:音頻 IC 開發(fā)工具 Eval Bd 24Bit Ultra LP Ster CD w/clH HP 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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