参数资料
型号: AD73522
厂商: Analog Devices, Inc.
英文描述: Dual Analog Front End with Flash based DSP Microcomputer(带闪速DSP微计算机的双模拟前端)
中文描述: 双模拟前端与闪存的DSP微机(带闪速DSP的微计算机的双模拟前端)
文件页数: 43/46页
文件大小: 654K
代理商: AD73522
AD73522
–43–
REV. PrC 05/99
Prelimnary Technical Data
PRELMNARY
DATA
FILTER
TECHNCAL
TIME
LOW-PASS
VFBN1
GAIN
1
+6/15dB
PGA
CONTINUOUS
TIME
LOW-PASS
FILTER
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFOUT
REFERENCE
V
REF
50k
V
100pF
50k
V
100pF
50k
V
50k
V
REFCAP
0.1
m
F
0/38dB
PGA
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. T he 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
+PGA
CONTINUOUS
V
REF
VINN
1
VINP1
VFBP1
VOUTP1
VOUTN1
REFOUT
REFERENCE
0/38dB
PGA
V
REF
0.047
m
F
0.047
m
F
100
V
100
V
10k
V
0.1
m
F
0.1
m
F
REFCAP
0.1
m
F
10k
V
Figure 27. Analog Input (AC-Coupled) Differential
If the ADC is being connected in single-ended mode, the
AD73522 should be programmed for single-ended mode
using the SEEN and INV bits of CRF and the inputs con-
nected as shown in Figure 28. When operated in single-
ended input mode, the AD73522 can multiplex one of the
two inputs to the ADC input.
VFBN1
GAIN
1
+6/15dB
PGA
CONTINUOUS
LOTIME
FILTER
V
REF
VINN
1
VINP1
VFBP1
VOUTP1
VOUTN1
REFOUT
REFERENCE
0/38dB
PGA
V
REF
0.047
m
F
100
V
10k
V
0.1
m
F
REFCAP
0.1
m
F
Figure 28. Analog Input (AC-Coupled) Single-Ended
If best performance is required from a single-ended source,
it is possible to configure the AD73522’s input amplifiers
as a single-ended to differential converter as shown in Figure
29.
VFBN1
GAIN
1
+6/15dB
PGA
CONTINUOUS
TIME
LOW-PASS
FILTER
V
REF
VINN
1
VFBP1
VOUTP1
VOUTN1
REFOUT
REFERENCE
PGA
50k
V
100pF
50k
V
100pF
50k
V
REFCAP
0.1
m
F
V
REF
Figure 29. Single-Ended to Differential Conversion On
Analog Input
Interfacing to an E lectret 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, therefore this output signal must be capacitively
coupled to remove the power supply (dc) component. In this
circuit the AD73522 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. T he buffered internal reference level at
REFOUT is used via an external buffer to provide power to
the electret microphone. T his 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.
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