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參數(shù)資料
| 型號(hào)： | AD1885 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | AC’97 SoundMAX Codec |
| 中文描述： | 16-BIT CONVERTER SUBSYSTEM ADC, SERIAL ACCESS, PDSO28 |
| 文件頁數(shù)： | 25/27頁 |
| 文件大?。?/td> | 291K |
| 代理商： | AD1885 |
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AD1885
–25–
REV. 0
MICROPHONE CONNECTIONS
The AD1885 contains an internal microphone preamp with 20 dB gain; in most cases a direct microphone connection as shown in
Figure 14 is adequate. If the microphone level is too low, an external preamp can be added as shown in Figure 15. 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.
AC-COUPLING
TO CODEC MIC1 OR MIC2 INPUT
FROM CODEC VREFOUT
MIC INPUT
1
2
3
4
5
J1
EMC
COMPONENTS
C1
470pF
C2
470pF
L2 600Z
L1 600Z
MIC BIAS
Figure 14. Recommended Microphone Input Connections
4
TO CODEC MIC1 OR MIC2 INPUT
FROM CODEC VREFOUT
AC-COUPLING
MIC INPUT
1
2
3
4
5
J1
EMC
COMPONENTS
C1
470pF
C2
470pF
L2 600Z
L1 600Z
MIC BIAS
AVDD
U1
PREAMP
AD8531
Figure 15. Microphone with Additional External Preamp (20 dB Gain)
LINE OUTPUT CONNECTIONS
The AD1885 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 recommend 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 specifica-
tion 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
FROM CODEC LINE_OUT_L
AC-COUPLING
J1
EMC
COMPONENTS
C2
470pF
C1
470pF
L1 600Z
L2 600Z
STEREO LINE_OUT JACK
NOTE:
IF AN OUTPUT AMP IS USED, THE
AC-COUPLING CAP VALUES WILL
DEPENDEND ON THE AMP DESIGN.
Figure 16. Recommended LINE_OUT Connections
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD1885JST | AC’97 SoundMAX Codec |
| AD1886 | AC’97 SoundMAX Codec |
| AD1886A | 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 |
| AD1886AJST | AC’97 SoundMAX Codec |
| AD1887JST | AC’97 SoundMAX Codec |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD1885JST | 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 48-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:AC97 VERSION 2.1 CODEC - Tape and Reel 制造商:Analog Devices 功能描述:IC CODEC AC'97 VERSION 2.1 |
| AD1885JST-REEL | 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 48-Pin LQFP T/R 制造商:Rochester Electronics LLC 功能描述:AC97 VERSION 2.1 CODEC - Tape and Reel |
| AD1885JSTZ | 制造商:Analog Devices 功能描述:IC CODEC STEREO AC'97 48LQFP |
| AD1885JSTZ | 制造商:Analog Devices 功能描述:TV / Video IC |
| AD1885JSTZKL1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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