參數(shù)資料
型號(hào)： CS4205-KQZ
廠商： Cirrus Logic Inc
文件頁數(shù)： 61/81頁
文件大小： 0K
描述： IC CODEC AC97 I2S 48-LQFP
標(biāo)準(zhǔn)包裝： 250
類型： 音頻編解碼器 '97
數(shù)據(jù)接口： 串行
分辨率（位）： 18，20 b
ADC / DAC 數(shù)量： 1 / 2
三角積分調(diào)變： 是
動(dòng)態(tài)范圍，標(biāo)準(zhǔn) ADC / DAC (db)： 90 / 90
電壓 - 電源，模擬： 4.75 V ~ 5.25 V
電壓 - 電源，數(shù)字： 4.75 V ~ 5.25 V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 48-LQFP
供應(yīng)商設(shè)備封裝： 48-TQFP（9x9）
包裝： 托盤
產(chǎn)品目錄頁面： 754 (CN2011-ZH PDF)
其它名稱： 598-1182
CS4205
64
DS489PP4
12. ANALOG HARDWARE
DESCRIPTION
The analog input section consists of four stereo
line-level
inputs
(LINE_L/R,
CD_L/GND/R,
VIDEO_L/R, and AUX_L/R), two selectable
mono microphone inputs (MIC1 and MIC2), and
two mono inputs (PC_BEEP and PHONE). The an-
alog output section consists of a mono output
(MONO_OUT) and a stereo line-level output
(LINE_OUT_L/R). This section describes the ana-
log hardware needed to interface with these pins.
The designs presented in this section are compliant
with Chapter 17 of Microsoft’s PC 99 System De-
sign Guide [7] (referred to as PC 99) and Chapter
11 of Microsoft’s PC 2001 System Design Guide
[8] (referred to as PC 2001). For information on
EMI reduction techniques refer to the application
note AN165: CS4297A/CS4299 EMI Reduction
Techniques [5].
12.1
Analog Inputs
All analog inputs to the CS4205, including
CD_GND, should be capacitively coupled to the
input pins. Unused analog inputs should be tied to-
gether and connected through a capacitor to analog
ground or tied to the Vrefout pin directly. The max-
imum allowed voltage for analog inputs, except the
microphone input, is 1 VRMS. The maximum al-
lowed voltage for the microphone input depends on
the selected boost setting.
12.1.1
Line Inputs
Figure 25 shows circuitry for a line-level stereo in-
put. Replicate this circuit for the Video and Aux in-
puts. This design attenuates the input by 6 dB,
bringing the signal from the PC 99 specified
2VRMS, to the CS4205 maximum allowed 1 VRMS.
12.1.2
CD Input
The CD line-level input has an extra pin,
CD_GND, providing a pseudo-differential input
for both CD_L and CD_R. This pin takes the
common-mode noise out of the CD inputs when
connected to the CD analog source ground. Follow-
ing the reference designs in Figure 26 and
Figure 27 provides extra attenuation of common
mode noise coming from the CD-ROM drive,
thereby producing a higher quality signal. One per-
cent resistors are recommended since closely
matched resistor values provide better com-
mon-mode attenuation of unwanted signals. The
circuit shown in Figure 26 can be used to attenuate
a 2 VRMS CD input signal by 6 dB. The circuit
shown in Figure 27 can be used for a 1 VRMS CD
input signal.
LINE_IN_R
LINE_IN_L
6.8 k
1.0
F
1.0
F
AGND
6.8 k
6.8 k
6.8 k
Figure 25. Line Input (Replicate for Video and AUX)
(All resistors 1%)
6.8 k
CD_L
CD_COM
CD_R
1.0
F
CD_L
CD_R
CD_GND
6.8 k
1.0
F
3.4 k
6.8 k
2.2
F
3.4 k
6.8 k
AGND
Figure 26. Differential 2 V
RMS CD Input
100
CD_L
CD_COM
CD_R
1.0
F
CD_L
CD_R
CD_GND
100
1.0
F
100
47 k
2.2
F
47 k
47 k
AGND
Figure 27. Differential 1 V
RMS CD Input
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