12.1.3 Microphone Inputs Figure 28 illustrates an input circuit suitable for dy- namic and electret microphones. Elec" />
參數(shù)資料
型號： CS4205-KQZ
廠商： Cirrus Logic Inc
文件頁數(shù)： 62/81頁
文件大?。?/td> 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
DS489PP4
65
12.1.3
Microphone Inputs
Figure 28 illustrates an input circuit suitable for dy-
namic and electret microphones. Electret, also
known as phantom-powered, microphones use the
right channel (ring) of the jack for power. The de-
sign also supports the recommended advanced fre-
quency response for voice recognition as specified
in PC 99 and PC 2001. The microphone input of the
CS4205 has an integrated pre-amplifier. Using
combinations of the 10dB bit in the Misc. Crystal
Control Register (Index 60) and the 20dB bit in the
Mic Volume Register (Index 0Eh) the pre-amplifier
gain can be set to 0 dB, 10 dB, 20 dB, or 30 dB.
12.1.4
PC Beep Input
The PC_BEEP input is useful for mixing the output
of the “beeper” (timer chip), provided in most PCs,
with the other audio signals. When the CS4205 is
held in reset, PC_BEEP is passed directly to the
line output. This allows the system sounds or
“beeps” to be available before the AC ’97 interface
has been activated. Figure 29 illustrates a typical
input circuit for the PC_BEEP input. If PC_BEEP
is driven from a CMOS gate, the 4.7 k
resistor
should be tied to analog ground instead of +5VA.
Although this input is described for a low-quality
“beeper”, it is of the same high-quality as all other
analog inputs and may be used for other purposes.
12.1.5
Phone Input
One application of the PHONE input is to interface
to the output of a modem analog front end (AFE)
device so that modem dialing signals and protocol
negotiations may be monitored through the audio
system. Figure 30 shows a design for a modem
connection where the output is fed from the
CS4205 MONO_OUT pin through a divider. The
divider ratio shown does not attenuate the signal,
providing an output voltage of 1 VRMS. If a lower
output voltage is desired, the resistors can be re-
placed with appropriate values, as long as the total
load on the output is kept greater than 10 k
. The
PHONE input is divided by 6 dB to accommodate
a line-level source of 2 VRMS.
12.2
Analog Outputs
The analog output section provides a stereo and a
mono output. The MONO_OUT, LINE_OUT_L,
and LINE_OUT_R pins require 680 pF to 1000 pF
NPO dielectric capacitors between the correspond-
ing pin and analog ground. Each analog output is
DC-biased up to the Vrefout voltage signal refer-
0.1
F
X7R
100
0.1
F
X7R
MIC1/MIC2
10
F
ELEC
AGND
+5VA
2.2 k
1.5 k
AGND
+
Figure 28. Microphone Input
4.7 k
PC_BEEP
+5VA (Low Noise) or
AGND if CMOS Source
PC-BEEP-BUS
47 k
2.7 nF
X7R
0.1
F
X7R
AGND
Figure 29. PC_BEEP Input
PHONE
MONO_OUT
PHONE
MONO_OUT
6.8 k
1.0
F
0
6.8 k
1.0
F
47 k
AGND
1000 pF
Figure 30. Modem Connection
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