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参数资料
型号： AD73322LYST
厂商： ANALOG DEVICES INC
元件分类： 通信及网络
英文描述： Low Cost, Low Power CMOS General-Purpose Dual Analog Front End
中文描述： SPECIALTY TELECOM CIRCUIT, PQFP44
封装： PLASTIC, MS-026-BEA, LQFP-44
文件页数： 28/40页
文件大小： 437K
代理商： AD73322LYST
REV. 0
AD73322L
–28–
VFBN1
GAIN
1
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFOUT
REFERENCE
AD73322L
V
REF
50k
100pF
50k
100pF
50k
50k
REFCAP
0.1 F
0PGA
+6/
15dB
–
CONTINUOUS
LFILTER
Figure 26. Analog Input (DC-Coupled) Using Internal
Amplifiers
In the case of ac coupling, a capacitor is used to couple the
signal to the input of the ADC. The ADC input must be biased
to the internal reference (REFCAP) level which is done by
connecting the input to the REFOUT pin through a 10 k
resistor as shown in Figure 27.
VFBN1
GAIN
1
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFOUT
REFERENCE
V
REF
100
100
0.1 F
REFCAP
0.1 F
0PGA
0.047
F
0.047
F
10k
0.1 F
10k
+6/
15dB
–
CONTINUOUS
LFILTER
AD73322L
Figure 27. Analog Input (AC-Coupled) Differential
If the ADC is being connected in single-ended mode, the
AD73322L should be programmed for single-ended mode using
the SEEN and INV bits of CRF and the inputs connected as
shown in Figure 28. When operated in single-ended input
mode, the AD73322L can multiplex one of the two inputs to
the ADC input.
VFBN1
GAIN
1
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFOUT
REFERENCE
0PGA
V
REF
0.047
F
100
10k
0.1 F
REFCAP
0.1 F
+6/
15dB
–
COTIME
LOW-PASS
FILTER
AD73322L
Figure 28. Analog Input (AC-Coupled) Single-Ended
If best performance is required from a single-ended source, it
is possible to configure the AD73322L
’
s input amplifiers as a
single-ended to differential converter as shown in Figure 29.
VFBN1
GAIN
1
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFOUT
REFERENCE
0PGA
50k
100pF
50k
100pF
50k
50k
REFCAP
0.1 F
V
REF
+6/
15dB
–
CONTIME
LFILTER
AD73322L
Figure 29. Single-Ended to Differential Conversion On
Analog Input
Interfacing to an Electret Microphone
Figure 30 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 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.
相关PDF资料
PDF描述
AD73322L KNOB, RT25; Series:29JF RoHS Compliant: Yes
AD73322 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)
AD73411 Low-Power CMOS Analog Front End with DSP Microcomputer(带DSP微计算机的单模拟前端)
AD73422-40K Integrated Dual Analog Front End Codec And DSP Microcomputer(集成双模拟前端的信号编解码器和数字信号处理器的芯片)
AD73422BB-80 Dual Low Power CMOS Analog Front End with DSP Microcomputer
相关代理商/技术参数
参数描述
AD73322LYSTZ 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述:
AD73360 制造商:AD 制造商全称:Analog Devices 功能描述:Six-Input Channel Analog Front End
AD73360AR 制造商:Analog Devices 功能描述:AFE General Purpose 6ADC 16-Bit 5V 28-Pin SOIC W 制造商:Analog Devices 功能描述:IC 16-BIT ADC
AD73360AR-REEL 制造商:Analog Devices 功能描述:AFE General Purpose 6ADC 16-Bit 5V 28-Pin SOIC W T/R 制造商:Analog Devices 功能描述:AFE GEN PURPOSE 6ADC 16BIT 5V/5V/5V 28SOIC W - Tape and Reel
AD73360AR-REEL7 制造商:Analog Devices 功能描述:AFE General Purpose 6ADC 16-Bit 5V 28-Pin SOIC W T/R 制造商:Analog Devices 功能描述:AFE GEN PURPOSE 6ADC 16BIT 5V/5V/5V 28SOIC W - Tape and Reel
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