6.1.5 Phone Input One application of the PHONE input is to interface to the output of a modem analog front end (AFE) device so" />
參數(shù)資料
型號： CS4299-JQZR
廠商： Cirrus Logic Inc
文件頁數(shù)： 32/52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： 是
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
38
6.1.5
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 16 shows a design for a modem
connection where the output is fed from the
CS4299 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.
6.2
Analog Outputs
The analog line-level output section provides two
stereo
outputs
and
a
mono
output.
The
LINE_OUT_L/R,
ALT_LINE_OUT_L/R,
and
MONO_OUT pins require 680 pF to 1000 pF NPO
capacitors between the corresponding pin and ana-
log ground. Each analog output is DC-biased up to
the Vrefout signal reference, nominally 2.3 V. This
requires the outputs be AC-coupled to external cir-
cuitry (AC load must be greater than 10 k
) or DC
coupled to a buffer op-amp biased at Vrefout.
6.2.1
Stereo Outputs
See Figure 18 for a line-level stereo output refer-
ence design. See Figure 17 for a recommended
headphone stereo output reference design.
6.2.2
Mono Output
The mono output, MONO_OUT, can be either a
sum of the left and right output channels, attenuat-
ed by 6 dB to prevent clipping at full scale, or the
selected Mic signal. The mono out channel can
drive the PC internal mono speaker using an appro-
priate buffer circuit
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 16. Modem Connection
ALT_LINE_OUT_R
ALT_LINE_OUT_L
27 k
1000 pF
NPO
AGND
3
2
1
220
F
ELEC
220
F
ELEC
+
1000 pF
NPO
27 k
47 k
AGND
22 pF
NPO
39 k
5
6
7
22 pF
NPO
39 k
+
-
+
-
TDA1308
Vrefout
10
1/4 Watt
10
1/4 Watt
47 k
Headphone
Out
Figure 17. Alternate Line Output as Headphone Output
AGND
ALT_LINE_OUT_R
27 k
1000 pF
NPO
1000 pF
NPO
1
2
3
4
AGND
0.1 F
Y5V
220 F
+
5
-
39 k
1
2
3
4
+
3
-
22 pF
NPO
22 pF
NPO
6
2
7
1
TDA1308
ALT_LINE_OUT_L
VREFOUT
+
ELEC
1/4 WATT
10
HP_OUT_R
220 F
+
ELEC
1/4 WATT
10
HP_OUT_L
47 k
1
3
4
AGND
2
1 F
Figure 18. Stereo Output
38
DS319PP6
CS4299
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