6.1.3 Microphone Inputs Figure 13 illustrates an input circuit suitable for dy- namic and electret microphones. Electret, or p" />
參數(shù)資料
型號: CS4299-JQZR
廠商: Cirrus Logic Inc
文件頁數(shù): 31/52頁
文件大?。?/td> 0K
描述: IC CODEC AC 97 W/SRC 48-LQFP
標(biāo)準(zhǔn)包裝: 2,000
系列: SoundFusion™
類型: 音頻編解碼器 '97
數(shù)據(jù)接口: 串行
分辨率(位): 18 b,20 b
ADC / DAC 數(shù)量: 1 / 1
三角積分調(diào)變:
動態(tài)范圍,標(biāo)準(zhǔn) ADC / DAC (db): 85 / 87
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-LQFP(7x7)
包裝: 帶卷 (TR)
CS4299
37
6.1.3
Microphone Inputs
Figure 13 illustrates an input circuit suitable for dy-
namic and electret microphones. Electret, or phan-
tom-powered, microphones use the right channel
(ring) of the jack for power. The design also sup-
ports the recommended advanced frequency re-
sponse for voice recognition as specified in PC 99.
Note the microphone input to the CS4299 has an
integrated pre-amplifier. Using the 20dB bit in the
Microphone Volume Register (Index 0Eh) the
pre-amplifier gain can be set to 0 dB or 20 dB.
Figure 14 shows an external pre-amplifier circuit
for an additional 18 dB gain.
6.1.4
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 CS4299 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 15 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.
0.33
F
220 pF
NPO
3.3
F
+
6.8 K
47 k
MC33078 or
MC33178
Vrefout
MIC1
or
MIC2
1
F
+
0.33
F
X7R
2 k
47 k
0.1
F
47
100 pF
NPO
Figure 13. Microphone Input
AGND
4
8
+5 VA
100
1
2
5
3
4
2.7
CGND
220 pF
68
AGND
0.068 F
X7R
AGND
+
-
AGND
4
1
8
+5 VA
U1A
MC33078D
3
2
10 F
AGND
+
47
AGND
+5 VA
47
+
-
6.8
10 F
AGND
+
6
5
220 pF
47 k
U1B
MC33078D
1F
X7R
7
MIC1/MIC2
k
k
k
k
k
k
47 k
Figure 14. Microphone Pre-amplifier
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 15. PC_BEEP Input
DS319PP6
37
CS4299
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