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參數(shù)資料
| 型號： | AD1881A |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | Codec |
| 英文描述： | AC’97 SoundMAX Codec |
| 中文描述： | AC\u0026#39;97聲卡SoundMAX編解碼器 |
| 文件頁數(shù)： | 23/26頁 |
| 文件大?。?/td> | 261K |
| 代理商： | AD1881A |
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AD1881A
–23–
REV. 0
1
2
3
4
5
C3
0.22 F
2.2k
R1
TO CODEC
MIC1 OR MIC2
INPUT
FROM CODEC
V
REFOUT
L1 600Z
L2 600Z
C1
470pF
C2
470pF
EMC COMPONENTS
MIC INPUT
J1
AC-COUPLING
Figure 12. Recommended Microphone Input Connections
R2
10k
R3
100k
PREAMP
AD8531
U1
1
2
3
4
5
C3
0.22 F
2.2k
R1
TO CODEC
MIC1 OR MIC2
INPUT
FROM CODEC
V
REFOUT
L1 600Z
L2 600Z
C1
470pF
C2
470pF
EMC COMPONENTS
MIC INPUT
J1
AC-COUPLING
C3
0.22 F
AC-COUPLING
MIC BIAS
+5AV
DD
Figure 13. Microphone with Additional External Preamp (20 dB Gain)
LINE OUTPUT CONNECTIONS
The AD1881A Codec provides stereo LINE_OUT signals at a standard 1 V rms level. These signals must be ac-coupled before they
can be connected to an external load. After the ac-coupling, a minimal resistive load is recommended to keep the capacitors properly
biased and reduce click and pop when plugging stereo equipment into the output jack. The capacitor values should be selected
to provide a desired frequency response, taking into account the nominal impedance of the external load. To meet the PC99
specification for PCs, testing must be performed with a 10 k
load, therefore a 1
μ
F value is recommended to achieve less than
–3 dB roll-off at 20 Hz.
FROM CODEC
LINE_OUT_R
L2 600Z
L1 600Z
C1
470pF
C2
470pF
EMC COMPONENTS
STEREO
LINE_OUT JACK
J1
C1
1 F
1 F
C2
+
+
AC-COUPLING
R1
47k
R2
47k
FROM CODEC
LINE_OUT_L
NOTE: IF AN OUTPUT AMP IS USED,
THE AC-COUPLING CAP VALUES WILL
DEPEND ON THE AMP DESIGN.
Figure 14. Recommended LINE_OUT Connections
USING AN EXTERNAL HEADPHONE/POWER AMP
The SSM2250 Power Amplifier is an ideal companion for the AD1881A. The amplifier can provide up to 250 mW output in stereo
mode and up to 1.5 W into a mono speaker connected in a bridge-tied load (BTL) configuration.
The SM2250 has a mode control pin that can be used to switch between the stereo output mode and the mono BTL speaker.
Figure 15 shows a typical PC configuration where the SSM2250 drives a set of stereo headphones or external speakers, as well as an
internal mono speaker. One of the normalizing pins on the stereo jack senses the stereo plug insertion and automatically switches
from driving the internal mono speaker to driving the external stereo load.
To conserve power, the SSM2250 can be shut down by the EAPD pin on the AD1881A, using proper power management software.
This is particularly important for portable applications. In shutdown mode, the SSM2250 consumes only 60
μ
A.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD1881AJST | 制造商:Rochester Electronics LLC 功能描述:AC97 VERSION 2.1 CODEC - Bulk 制造商:Analog Devices 功能描述: 制造商:Analog Devices 功能描述:IC CODEC AC'97 VERSION 2.1 |
| 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 |
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