參數(shù)資料
型號(hào)： XWM8731EDS
廠商： Wolfson Microelectronics
元件分類： Codec
英文描述： Portable Internet Audion CODEC with Headphone Driver and Programmable Sample Rates
中文描述： 便攜式互聯(lián)網(wǎng)三極管編解碼器的耳機(jī)驅(qū)動(dòng)器和可編程采樣率
文件頁(yè)數(shù)： 20/56頁(yè)
文件大?。?/td> 595K
代理商： XWM8731EDS
WM8731
Advanced Information
WOLFSON MICROELECTRONICS LTD
AI Rev 2.0 February 2001
20
For interfacing to a typical CD system, it is recommended that the input is scaled to ensure that there
is no clipping of the signal. R1 = 5.6k, R2 = 5.6k, C1 = 220pF, C2 = 1
μ
F.
R1 and R2 form a resistive divider to attenuate the 2 Vrms output from a CD player to a 1 Vrms level,
so avoiding overloading the inputs. R2 also provides a discharge path for C2, thus preventing the
input to C2 charging to an excessive voltage which may otherwise damage any equipment connected
that is not suitably protected against high voltages. C1 forms an RF low pass filter for increasing the
rejection of RF interference picked up on any cables. C2 forms a DC blocking capacitor to remove
the DC path between the WM8731 and the driving audio equipment. C2 together with the input
impedance of the WM8731 form a high pass filter.
MICROPHONE INPUT
MICIN is a high impedance, low capacitance input suitable for connection to a wide range of
monophonic microphones of different dynamics and sensitivities.
The MICIN includes programmable volume adjustments and a mute function. The scheme is shown
in Figure 11. Passive RF and active Anti-Alias filters are also incorporated within the microphone
inputs. These allow a matched interface to the multi-bit oversampling ADC and preventing high
frequencies aliasing into the audio band or otherwise degrading performance.
50k
10k
VMID
MICIN
To
ADC
VMID
20dB GAIN BOOST
Figure 11 Microphone Input Schematic
There are 2 stages of gain made up of two low noise inverting operational amplifiers.
The 1
st
stage comprises a nominal gain of G1 = 50k/10k = 5. By adding an external resistor (Rmic) in
series with MICIN the gain of stage can be adjusted. For example adding Rmic = 40K sets the gain
of stage 1 to x1 (0dB). The equation below can be used to calculate the gain versus Rmic.
G1 = 50k/ (Rmic + 10k)
Or alternatively to calculate the value of Rmic to achieve a given gain, G1.
Rmic = (50k/G1)
–
10k
The internal 50k and 10k resistors have a tolerance of 15%. For Rmicext = 90k G = 0.5 (-6dB) and
for Rmicext = 0 G = x10 (14dB).
The 2
nd
stage comprises a 0dB gain stage that can be software configured to provide a fixed 20dB of
gain for low sensitivity microphones.
The microphone input can therefore be configured with a variable gain of between -6dB and 14dB on
the 1
st
stage, and an additional fixed 0dB or 20dB on the 2
nd
stage. This allows for all gains to the
input signal in the range
–
6dB to 34dB to be catered for.
The ADC Full Scale input is 1.0V rms at AVDD = 3.3 volts. Any voltage greater than full scale will
possibly overload the ADC and cause distortion. Note that the full scale input tracks directly with
AVDD. Stage 1 and Stage 2 gains should be configured so that the ADC receives a maximum signal
equal to its full scale for maximising the signal to noise.
The software control for the MICIN is shown in Table 3. Note that the Microphone Mute only mutes
the input to the ADC, this will still allow the Microphone Input signal to pass to the line output in
Sidetone Mode.
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XWM8734EDS/V 功能描述:接口—CODEC Stereo CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
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