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参数资料
| 型号： | AD73311LAR |
| 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 Analog Front End |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO20 |
| 封装： | 0.300 INCH, SOIC-20 |
| 文件页数： | 23/36页 |
| 文件大小： | 382K |
| 代理商： | AD73311LAR |
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REV. A
AD73311L
–23–
The dc biasing of the analog input signal is accomplished with
an on-chip voltage reference. If the input signal is not biased at
the internal reference level (via REFOUT), it must be ac-coupled
with external coupling capacitors. C
IN
should be 0.1
μ
F or larger.
The dc biasing of the input can then be accomplished using
resistors to REFOUT as in Figures 27 through 29.
REFCAP
REFOUT
REFERENCE
0PGA
BUFFER
0.1 F
V
REF
AD73311L
VINP
VINN
VOUTP
VOUTN
PGA
CONTINUOUS
LOTIME
FILTER
Figure 26. Analog Input (DC-Coupled) Using External
Amplifiers
The AD73311L
’
s ADC inputs are biased about the internal
reference level (REFCAP level), therefore it may be neces-
sary to bias external signals to this level using the buffered
REFOUT level as the reference. This is applicable in either dc-
or ac-coupled con
fi
gurations. In the case of dc coupling, the signal
(biased to REFOUT) may be applied directly to the inputs
(using ampli
fi
er bypass), as shown in Figure 25, or it may be
conditioned in an external op amp where it can also be biased
to the reference level using the buffered REFOUT signal as
shown in Figure 26.
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.
COTIME
LFILTER
REFOUT
REFERENCE
V
REF
REFCAP
0.1 F
10k
VOUTP
VOUTN
VINP
0.047 F
100
0.1 F
10k
VINN
0.047 F
100
0.1 F
0PGA
AD73311L
+6/
15dB
–
Figure 27. Analog Input (AC-Coupled) Differential
If the ADC is being connected in single-ended mode, the
AD73311L 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 AD73311L can multiplex one of the two inputs to the ADC
input, as shown in Figures 28 and 29.
COTIME
LOW-PASS
FILTER
REFOUT
REFERENCE
0PGA
V
REF
REFCAP
0.1 F
VINN
VINP
0.047
F
100
0.1 F
VOUTP
VOUTN
10k
AD73311L
+6/
–
15dB
PGA
Figure 28. Analog Input (AC-Coupled) Single-Ended
CONTINUOUS
LFILTER
REFOUT
REFERENCE
0PGA
V
REF
REFCAP
0.1 F
VINN
VINP
0.047
F
100
0.1 F
VOUTP
VOUTN
10k
AD73311L
PGA
Figure 29. Analog Input (AC-Coupled) Single-Ended
(Alternate 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 ampli
fi
er whose output is accessed on
the same lead that supplies power to the microphone; therefore,
this output signal must be capacitively coupled to remove the
power supply (dc) component. In this circuit the AD73311L
input channel is being used in single-ended mode where the
internal inverting ampli
fi
er 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, the microphone can be powered from the
system power supply.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD73311LAR-REEL | 制造商:Analog Devices 功能描述:Audio Codec 1ADC / 1DAC 16-Bit 20-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:SINGLE-CHANNEL AFE I.C. - Tape and Reel |
| AD73311LAR-REEL7 | 制造商:Analog Devices 功能描述:Audio Codec 1ADC / 1DAC 16-Bit 20-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:SINGLE-CHANNEL AFE I.C. - Tape and Reel |
| AD73311LARS | 制造商:Analog Devices 功能描述:Audio Codec 1ADC / 1DAC 16-Bit 20-Pin SSOP 制造商:Rochester Electronics LLC 功能描述:SINGLE-CHANNEL AFE I.C. - Bulk 制造商:Analog Devices 功能描述:IC AUDIO CODEC |
| AD73311LARS-REEL | 制造商:Analog Devices 功能描述:Audio Codec 1ADC / 1DAC 16-Bit 20-Pin SSOP T/R |
| AD73311LARSREEL7 | 制造商:AD 功能描述:New |
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