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参数资料
| 型号： | AD73322 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Low Cost, Low Power CMOS General Purpose Dual Analog Front End(低成本，低功耗的CMOS通用双模拟前端处理器) |
| 中文描述： | 低成本，低功耗CMOS通用双模拟前端（低成本，低功耗的的CMOS通用双模拟前端处理器） |
| 文件页数： | 32/43页 |
| 文件大小： | 427K |
| 代理商： | AD73322 |
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AD73322
–32–
REV. 0
Interfacing to an Electret Microphone
Figure 34 details an interface for an electret microphone which
may be used in some voice applications. Electret microphones
typically feature a FET amplifier whose output is accessed on
the same lead which supplies power to the microphone, there-
fore this output signal must be capacitively coupled to remove
the power supply (dc) component. In this circuit the AD73322
input channel is being used in single-ended mode where the
internal inverting amplifier provides suitable gain to scale the
input signal relative to the ADC’s full-scale input range. The
buffered internal reference level at REFOUT is used via an
external buffer to provide power to the electret microphone.
This provides a quiet, stable supply for the microphone. If this
is not a concern, then the microphone can be powered from the
system power supply.
VFBN1
GAIN
1
+PGA
COTIME
LFILTER
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
REFERENCE
AD73322
V
REF
0PGA
ELECTRET
PROBE
10
m
F
R
A
R
B
R1
R2
+5V
C2
C1
C
REFCAP
Figure 34. Electret Microphone Interface Circuit
Analog Output
The AD73322’s differential analog output (VOUT) is produced
by an on-chip differential amplifier. The differential output can
be ac-coupled or dc-coupled directly to a load which can be a
headset or the input of an external amplifier (the specified mini-
mum resistive load on the output section is 150
.) It is possible
to connect the outputs in either a differential or a single-ended
configuration but please note that the effective maximum output
voltage swing (peak to peak) is halved in the case of single-
ended connection. Figure 35 shows a simple circuit providing a
differential output with ac coupling. The capacitors in this cir-
cuit (C
OUT
) are optional; if used, their value can be chosen as
follows:
C
f R
OUT
LOAD
=
1
2
π
where
f
C
= desired cutoff frequency.
VFBN1
GAIN
1
+PGA
CONTINUOUS
LFILTER
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
REFERENCE
AD73322
C
REFCAP
R
LOAD
C
OUT
C
OUT
Figure 35. Example Circuit for Differential Output
Figure 36 shows an example circuit for providing a single-ended
output with ac coupling. The capacitor of this circuit (C
OUT
) is
not optional if dc current drain is to be avoided.
VFBN1
GAIN
1
+PGA
COTIME
LFILTER
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
REFERENCE
AD73322
R
LOAD
C
OUT
0.1
m
F
Figure 36. Example Circuit for Single-Ended Output
Differential to Single-Ended Output
In some applications it may be desireable to convert the full
differential output of the decoder channel to a single-ended
signal. The circuit of Figure 37 shows a scheme for doing this.
VFBN1
GAIN
1
+6/15dB
PGA
CONTINUOUS
LOTIME
FILTER
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
REFERENCE
AD73322
V
REF
0/38dB
PGA
R
LOAD
R
I
R
I
R
F
R
F
0.1
m
F
Figure 37. Example Circuit for Differential to Single-
Ended Output Conversion
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD73322AR | 制造商:Analog Devices 功能描述:IC AUDIO CODEC |
| AD73322AR-REEL | 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 28-Pin SOIC W T/R |
| AD73322AR-REEL7 | 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 28-Pin SOIC W T/R |
| AD73322ARZ | 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 28-Pin SOIC W 制造商:Analog Devices 功能描述:AUD CODEC 2ADC / 2DAC 16BIT 28SOIC - Trays 制造商:Analog Devices 功能描述:Dual Voice Band Codec 16-Bit 3/5V SOIC28 |
| AD73322ARZ-REEL | 制造商:Analog Devices 功能描述:DUAL VOICE BAND ANALOG FRONT END IC (ROHS) - Tape and Reel 制造商:Analog Devices 功能描述:DUAL VOICEBAND ANALOG FRONT END IC |
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