參數(shù)資料
型號： AD73322LYRZ
廠商： Analog Devices Inc
文件頁數(shù)： 28/48頁
文件大?。?/td> 0K
描述： IC ANALOG FRONT END DUAL 28-SOIC
標(biāo)準(zhǔn)包裝： 27
位數(shù)： 16
通道數(shù)： 4
功率（瓦特）： 73mW
電壓 - 電源，模擬： 2.7 V ~ 5.5 V
電壓 - 電源，數(shù)字： 2.7 V ~ 5.5 V
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 28-SOIC W
包裝： 管件
AD73322L
Rev. A | Page 34 of 48
INTERFACING TO AN ELECTRET MICROPHONE
Figure 39 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;
therefore, this output signal must be capacitively coupled to
remove the power supply (dc) component. In this circuit, the
AD73322L 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.
CONTINUOUS
TIME
LOW-PASS
FILTER
VREF
VFBN1
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
AD73322L
+6/–15dB
PGA
0/38dB
PGA
GAIN
±1
REFOUT
REFCAP
REFERENCE
VREF
R1
RB
RA
50k
CREFCAP
100pF
C2
ELECTRICITY
PROBE
10
F
5V
00691-
039
Figure 39. Electret Microphone Interface Circuit
ANALOG OUTPUT
The AD73322L’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
minimum 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 40 shows a simple
circuit providing a differential output with ac coupling. The
capacitors in this circuit (COUT) are optional; if used, their value
can be chosen as follows:
LOAD
OUT
R
fc
C
π
=
2
1
where fC = desired cutoff frequency.
CONTINUOUS
TIME
LOW-PASS
FILTER
VREF
VFBN1
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
AD73322L
+6/–15dB
PGA
GAIN
±1
REFOUT
REFCAP
REFERENCE
CREFCAP
RLOAD
COUT
00691-040
Figure 40. Example Circuit for Differential Output
Figure 41 shows an example circuit for providing a single-ended
output with ac coupling. The capacitor of this circuit (COUT) is
not optional if dc current drain is to be avoided.
00691-041
CONTINUOUS
TIME
LOW-PASS
FILTER
VREF
VFBN1
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
AD73322L
+6/–15dB
PGA
GAIN
±1
REFOUT
REFCAP
REFERENCE
0.1
F
RLOAD
COUT
Figure 41. Example Circuit for Single-Ended Output
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