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參數(shù)資料
| 型號(hào)： | AD1886A |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | IR Emitting Diode; Power Dissipation, Pd:50mW; Viewing Angle:45 ; Package/Case:SIP; Operating Temperature Range:-25 C to +85 C; Leaded Process Compatible:Yes RoHS Compliant: Yes |
| 中文描述： | AC\u0026#39;97聲卡SoundMAX編解碼器 |
| 文件頁數(shù)： | 26/28頁 |
| 文件大小： | 281K |
| 代理商： | AD1886A |
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REV. 0
AD1886A
–26–
APPLICATION CIRCUITS
CD-ROM CONNECTIONS
Typical CD-ROM drives generate 2 V rms output and require a voltage divider for compatibility with the Codec input (1 V rms range).
The recommended circuit is a group of divide-by-two voltage dividers as shown on Figure 14.
The CD_GND_REF pin is used to cancel differential ground noise from the CD-ROM. For optimal noise cancellation, this section
of the divider should have approximately half the impedance of the Right and Left channel section dividers.
1
2
3
4
HEADER FOR
CD ROM AUDIO
(LGGR)
VOLTAGE DIVIDER
AC-COUPLING
TO CODEC CD_L INPUT
TO CODEC CD_GND_REF INPUT
TO CODEC CD_R INPUT
R1
4.7k
R3
2.7k
R5
4.7k
R6
4.7k
R4
2.7k
R2
4.7k
C1
0.33 F
C2
0.33 F
C3
0.33 F
+
+
+
Figure 14. Typical CD-ROM Audio Connections
LINE_IN, AUX, AND VIDEO INPUT CONNECTIONS
Most audio sources also generate 2 V rms audio level and require a –6dB input voltage divider to be compatible with the Codec
inputs. Figure 15 shows the recommended application circuit. For applications requiring EMC compliance, the EMC components
should be configured and selected to provide adequate RF immunity and emissions control.
VOLTAGE DIVIDER
AC-COUPLING
TO CODEC RIGHT CHANNEL INPUT
TO CODEC LEFT CHANNEL INPUT
LINE/AUX/VIDEO INPUT
1
2
3
4
5
J1
EMC
COMPONENTS
C1
470pF
C2
470pF
L2 600Z
L1 600Z
+
+
R1
4.7k
R3
4.7k
R2
4.7k
R4
4.7k
C3
0.33 F
C4
0.33 F
Figure 15. LINE_IN, AUX and VIDEO Input Connections
MICROPHONE CONNECTIONS
The AD1886A contains an internal microphone preamp with 20dB gain; in most cases a direct microphone connection as shown in
Figure 16 is adequate. If the microphone level is too low, an external preamp can be added as shown in Figure 17. In either case the
microphone bias can be derived from the codec’s internal reference (V
REFOUT
) using a 2.2 k
resistor. For the preamp circuit, the
V
REFOUT
signal can also provide the midpoint bias for the amplifier.
To meet the PC99 1.0A requirements, the MIC signal should be placed on the microphone jack tip and the bias on the ring. This
configuration supports electret microphones with three conductor plugs as well as dynamic microphones with two conductor plugs
(ring and sleeve shorted together).
Additional filtering may be required to limit the microphone response to the audio band of interest.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD1886AJST | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD1886AJST-REEL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD1886AJSTZ | 制造商:Rochester Electronics LLC 功能描述: |
| AD1886AJSTZ-RL | 制造商:Analog Devices 功能描述:Audio Codec EOL061109 |
| AD1886JST | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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