參數(shù)資料
型號(hào)： AD73322LARUZ-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 26/43頁(yè)
文件大?。?/td> 0K
描述： IC PROCESSOR FRONTEND DL 28TSSOP
標(biāo)準(zhǔn)包裝： 2,500
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-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 28-TSSOP
包裝： 帶卷 (TR)
AD73322
–32–
REV. B
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.
CONTINUOUS
TIME
LOW-PASS
FILTER
VREF
VFBN1
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
AD73322
VREF
+6/–15dB
PGA
REFERENCE
0/38dB
PGA
GAIN
1
C1
R2
R1
C2
RB
RA
+5V
ELECTRET
PROBE
10 F
CREFCAP
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 (COUT) are optional; if used, their value can be chosen as
follows:
C
fR
OUT
C
LOAD
=
1
2
π
where fC = desired cutoff frequency.
VFBN1
GAIN
1
VREF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
REFERENCE
AD73322
CREFCAP
RLOAD
COUT
+6/–15dB
PGA
CONTINUOUS
TIME
LOW-PASS
FILTER
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 (COUT) is
not optional if dc current drain is to be avoided.
VFBN1
GAIN
1
VREF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
REFERENCE
AD73322
RLOAD
COUT
0.1 F
+6/–15dB
PGA
CONTINUOUS
TIME
LOW-PASS
FILTER
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
VREF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
REFERENCE
AD73322
VREF
0/38dB
PGA
RLOAD
R I
R F
0.1 F
+6/–15dB
PGA
CONTINUOUS
TIME
LOW-PASS
FILTER
Figure 37. Example Circuit for Differential to Single-
Ended Output Conversion
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AD73322LARZ 功能描述:IC ANALOG FRONT END DUAL 28-SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模擬前端 (AFE) 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):- 通道數(shù):2 功率（瓦特）:- 電壓 - 電源，模擬:3 V ~ 3.6 V 電壓 - 電源，數(shù)字:3 V ~ 3.6 V 封裝/外殼:32-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:32-QFN（5x5） 包裝:帶卷 (TR)
AD73322LARZ-REEL 制造商:Analog Devices 功能描述:DUAL-CHANNEL, 3 V FRONT-END PROCESSOR FOR GENERAL PURPOSE - Tape and Reel
AD73322LAST 制造商:Rochester Electronics LLC 功能描述:SPEECH AND TELEPHONY CODEC I.C. - Tape and Reel 制造商:Analog Devices 功能描述:
AD73322LAST-REEL 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 44-Pin LQFP T/R 制造商:Rochester Electronics LLC 功能描述:SPEECH AND TELEPHONY CODEC I.C. - Tape and Reel
AD73322LASTZ 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:
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