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參數(shù)資料
| 型號： | AD1881AJST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 消費家電 |
| 英文描述： | AC’97 SoundMAX Codec |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, LQFP-48 |
| 文件頁數(shù)： | 22/26頁 |
| 文件大?。?/td> | 261K |
| 代理商： | AD1881AJST |
AD1881A
–22–
REV. 0
CD-ROM CONNECTIONS
The CD-ROM audio output level should be investigated; typical 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 basically a group of divide-by-two voltage dividers
as shown on Figure 10.
The CD_GND_REF pin is used to cancel differential ground noise from the CD-ROM. For optimum noise cancellation, this section
of the divider should have approximately half the impedance of the right and left channel section dividers.
HEADER FOR
CD ROM AUDIO
(LGGR)
1
2
3
4
VOLTAGE
DIVIDER
R1
4.7k
R3
2.7k
4.7k
R5
R2
4.7k
R4
2.7k
R6
4.7k
C1
0.33 F
0.33 F
0.33 F
C2
C3
TO CODEC
CD_L INPUT
TO CODEC
CD_GND_REF
INPUT
TO CODEC
CD_R INPUT
+
+
+
Figure 10. Typical CD-ROM Audio Connections
LINE_IN, AUX AND VIDEO INPUT CONNECTIONS
Most of these audio sources also generate 2 V rms audio level and require a –6 dB input voltage divider to be compatible with the
Codec inputs. Figure 11 shows the recommended application circuit. For applications requiring EMC compliance, the EMC compo-
nents should be configured and selected to provide adequate RF immunity and emissions control.
1
2
3
4
5
R1
4.7k
R2
4.7k
C3
0.33 F
0.33 F
C4
TO CODEC
RIGHT CHANNEL
INPUT
+
+
R3
4.7k
R4
4.7k
TO CODEC
LEFT CHANNEL
INPUT
L2 600Z
L1 600Z
C1
470pF
C2
470pF
EMC
COMPONENTS
VOLTAGE
DIVIDER
AC-COUPLING
LINE/AUX/VIDEO
INPUT
J1
Figure 11. LINE_IN, AUX, and Video Input Connections
MICROPHONE CONNECTIONS
The AD1881A contains an internal microphone preamp with 20 dB gain, in most cases a direct microphone connection as shown in
Figure 12 is adequate. If the microphone level is too low, an external preamp can be added as shown in Figure 13. 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 mid-point 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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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD1881AJSTZ | 制造商:Analog Devices 功能描述:IC AUDIO CODEC |
| AD1881AJSTZ-REEL | 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 48-Pin LQFP T/R |
| AD1881JST | 制造商:Analog Devices 功能描述:AC'97 SOUNDMAX CODEC 制造商:Analog Devices 功能描述:SOUNDCARD CIRCUITS, 48 Pin, Plastic, QFP |
| AD1882 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Definition Audio SoundMAX Codec |
| AD1882A | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Definition Audio SoundMAX Codec |
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